International Journal of Ceramic Engineering & Science最新文献

{"title":"Extrudability of geopolymers and control of the formed networks by zeta potential and NMR spectroscopy","authors":"Wilfried Cyrille N'Cho,&nbsp;Ameni Gharzouni,&nbsp;Isabel Sobrados,&nbsp;Jenny Jouin,&nbsp;Anne Aimable,&nbsp;Sylvie Rossignol","doi":"10.1002/ces2.10244","DOIUrl":"10.1002/ces2.10244","url":null,"abstract":"<p>In this study, the local-scale structure of geopolymers shaped by extrusion or 3D printing was investigated and correlated to the reactivity of the raw materials. The reactivity of the different metakaolin mixtures was evaluated using zeta potential measurements with different alkali silicate solutions, followed by shaping via 3D printing; additionally, the different networks formed were identified via NMR spectroscopy. The results showed that in the presence of weakly reactive basic solutions, the Al(OH)₄⁻ species were released in low amounts due to an increase in the polymerized silicate species in the solution, resulting in a low zeta potential in absolute value. Conversely, for more reactive solutions, the silicate species were more depolymerized, and the siliceous and aluminous metakaolin species were more easily released in solution, resulting in increasingly low zeta potential values. Some samples were 3D printed with metakaolin mixtures using different printers and silicate solutions (K, KNa) with alkaline cation concentrations of [M] &gt; 2.8 M in the mixtures; here, the metakaolin zeta potential values were greater than −50 mV, and the local-scale structure consisted of more than 50% geopolymer networks (Q⁴(3Al) + Q⁴(2Al)).</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10244","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Y–Bi–Co oxide doping on electrical performance of ZnO varistors based on simulation analysis","authors":"Zhengzheng Fu,&nbsp;Zongxi Zhang,&nbsp;Songhai Fan,&nbsp;Tao Cui,&nbsp;Donghui Luo,&nbsp;Yue Yin,&nbsp;Pengfei Meng,&nbsp;Jingke Guo","doi":"10.1002/ces2.10245","DOIUrl":"10.1002/ces2.10245","url":null,"abstract":"&lt;p&gt;ZnO varistors doped with &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;Y&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;O&lt;/mi&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;${rm Y}_2{rm O}_3$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;Bi&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;O&lt;/mi&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;${rm Bi}_2{rm O}_3$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, and &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;Co&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;O&lt;/mi&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;${rm Co}_2{rm O}_3$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; were analyzed for electrical performance, microstructure, phase composition, and elemental distribution using electrical performance testing, scanning electron microscopy, X-ray diffraction, and energy dispersive spectroscopy tests. The best results were obtained with 0.5 mol% &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;Y&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;O&lt;/mi&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;${rm Y}_2{rm O}_3$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, 2 mol% &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;Bi&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;O&lt;/mi&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;${rm Bi}_2{rm O}_3$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, and 3 mol% &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;Co&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;O&lt;/mi&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;${rm Co}_2{rm O}_3$&lt;/annotation&gt;\u0000 ","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10245","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of treated palm fibers on the mechanical properties of compressed earth bricks stabilized by alkali-activated binder-based natural pozzolan","authors":"Rolande Aurelie Tchouateu Kamwa,&nbsp;Joseph Bikoun Mousi,&nbsp;Sylvain Tome,&nbsp;Juvenal Giogetti Deutou Nemaleu,&nbsp;Martine Gérard,&nbsp;Marie-Annie Etoh,&nbsp;Jacques Etame","doi":"10.1002/ces2.10246","DOIUrl":"10.1002/ces2.10246","url":null,"abstract":"<p>The aim of this work is to study the influence of the palm fibers treated with soda hydroxide solution on the properties of the compressed earth bricks stabilized (CEBs) with alkali-activated binder. The improvement in their mechanical parameters is attributable with 15 wt.% of alkali-activated binder-based natural pozzolan. To achieve this objective, mortars composed of treated fibers at different levels (0.1, 0.2, 0.3, 0.4, and 0.5 wt.%) of lengths of 4 and 16 cm have been developed. These different mortars with and without fibers were subjected to mechanical (dry and wet compressive test, flexural test), physical (water absorption), mineralogical (XRD, FTIR), and microstructural (SEM/EDS) characterizations after 7 and 90 days. The results revealed that in general the incorporation of fibers improves the mechanical and physical properties of CEBs stabilized with 15 wt.% of alkali-activated binder. Furthermore, the X-ray diffraction analysis indicated that certain mineralogical phases of the raw materials dissolve during alkaline activation. The Fourier transform infrared spectra revealed the effectiveness of the fibers in sorption water molecules. Moreover, optical examination reveals that the binder utilized completely wraps the fibers. This demonstrates that the treated fibers function flawlessly as a filler in the matrix. At 90 days with the addition of 0.4 wt.% fibers, the maximum dry compressive strength and flexural strength values were 8.08<span></span><math>\u0000 <semantics>\u0000 <mo>±</mo>\u0000 <annotation>$ pm $</annotation>\u0000 </semantics></math>0.40 and 5.8<span></span><math>\u0000 <semantics>\u0000 <mo>±</mo>\u0000 <annotation>$ pm $</annotation>\u0000 </semantics></math>0.19 MPa, respectively. The stabilized earth bricks reinforced with 0.4 wt.% of palm fibers exhibited the mechanical properties values fitting the requirements of the materials candidate for the building construction applications especially as masonry bricks.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10246","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New approach of recycling vanadium-bearing slags as a binder in high-alumina refractory castables application","authors":"Mathilda Derensy,&nbsp;Thomas Zanin,&nbsp;Jan-Felix Bleck,&nbsp;Thorsten Tonnesen,&nbsp;Jesus Gonzalez-Julian","doi":"10.1002/ces2.10242","DOIUrl":"10.1002/ces2.10242","url":null,"abstract":"<p>Handling the massive quantities of by-products from metallurgical processes has become a major concern in recent decades. Efforts to develop sustainable alternatives for these secondary resources are ongoing to achieve the transition to climate neutrality. This study has investigated the potential of employing vanadium-bearing slag as a new value-added binder in refractories, aiming to replace virgin raw materials. Two types of vanadium-bearing slags from BOF, each containing &lt;2 wt.% vanadium were studied. Low-cement vanadium slag-based castables were prepared by gradually substituting 0, 2.5, and 5 wt.% of the commercial calcium aluminate cements (Secar71 and CMA72) by the slags. The flow values of the mixes containing 5 wt.% of slag decrease significantly from about 90% to 30% after 30 min, showing poor ability to flow and thus are not considered as self-flow castables. Castables containing 2.5 wt.% of slag present a cold crushing strength value, in the range of 71–116 MPa while values for castables containing 5 wt.% of slag fall into the range of 53–68 MPa due to the lower packing properties leading to higher porosity and reduce in strength. Similar observation was concluded for cold modulus of rupture. The micrographs of the samples containing both slag and cement show promising compatibility between the binder and aggregates after sintering at 1500°C. Overall, characteristics obtained with the samples containing slag show promising alternatives as a refractory lining.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10242","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143113039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of silver salt type on the physicochemical properties and antimicrobial activity of solid-state Ag-exchanged zeolites","authors":"Sajad Faryad,&nbsp;Mohammad Ghorbanpour,&nbsp;Majid Safajou-Jahankhanemlou","doi":"10.1002/ces2.10241","DOIUrl":"10.1002/ces2.10241","url":null,"abstract":"<p>The silver-exchanged zeolites were created using a solid-state ion exchange method with silver sulfate and silver nitrate salts. Various techniques, including X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area analysis, scanning electron microscopy, and energy-dispersive X-ray spectroscopy, were employed to examine the structure, morphology, and physical-chemical properties of the samples. The antimicrobial effectiveness of the zeolites was tested against gram-negative <i>Escherichia coli</i> and gram-positive <i>Staphylococcus aureus</i>, common bacteria found in wastewater. Before the silver exchange, the original zeolite exhibited small clustered particles, but after the exchange, its shape underwent significant transformation. The original clinoptilolite did not contain any silver, whereas the silver-exchanged samples AgSSE6% and AgNSE6% had silver contents of 2.29% and 3.80%, respectively. The XRD analysis confirmed the presence of Ag and AgO within the structure of the exchanged clinoptilolite. BET analysis indicated that the incorporation of Ag ions into the zeolite structure through ion exchange led to a reduction in surface area and micropores volume. The research findings revealed that zeolites exchanged with silver were more effective in inhibiting the growth of <i>S. aureus</i>, compared to <i>E. coli</i>. Additionally, zeolites treated with AgSO₄ exhibited a wider inhibition zone against both bacteria compared to zeolites treated with AgNO₃.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10241","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142692048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of the sintering temperature on the electrical properties of Y–Al-doped ZnO varistors","authors":"Lei Wang,&nbsp;Hang Zhang,&nbsp;Kexin Zhang,&nbsp;Yubo Shen,&nbsp;Limin Qu,&nbsp;Yue Yin,&nbsp;Pengfei Meng,&nbsp;Jingke Guo","doi":"10.1002/ces2.10243","DOIUrl":"10.1002/ces2.10243","url":null,"abstract":"&lt;p&gt;To investigate the relationship between the electrical properties of Y–Al doped ZnO varistors and sintering temperature, in this study, we measured the voltage–current characteristics and electrical performance parameters of samples sintered at &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msup&gt;\u0000 &lt;mn&gt;1100&lt;/mn&gt;\u0000 &lt;mo&gt;∘&lt;/mo&gt;\u0000 &lt;/msup&gt;\u0000 &lt;mi&gt;C&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$1100^circ text{C}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;–&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msup&gt;\u0000 &lt;mn&gt;1300&lt;/mn&gt;\u0000 &lt;mo&gt;∘&lt;/mo&gt;\u0000 &lt;/msup&gt;\u0000 &lt;mi&gt;C&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$1300^circ text{C}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;. Scanning electron microscopy observations revealed that as the sintering temperature increased, the grain size grew significantly, leading to a reduction in voltage gradient. Through &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;C&lt;/mi&gt;\u0000 &lt;mtext&gt;--&lt;/mtext&gt;\u0000 &lt;mi&gt;V&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$Ctext{--}V$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; characteristic testing, X-ray diffraction and energy dispersive X-ray spectroscopy analysis, it was found that the increase in sintering temperature promoted the formation of interface negative charge and defect reactions by &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;Y&lt;/mi&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;mo&gt;+&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msup&gt;\u0000 &lt;annotation&gt;${rm Y}^{3+}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, increasing &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;N&lt;/mi&gt;\u0000 &lt;mi&gt;i&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$N_{text{i}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; and &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;N&lt;/mi&gt;\u0000 &lt;mi&gt;d&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;annotation&gt;$N_{text{d}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;; &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;Al&lt;/mi&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;mo&gt;+&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msup&gt;\u0000 &lt;annotation&gt;${rm Al}^{3+}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; tends to aggregate in the grain area, further increasing &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 ","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10243","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Use of metakaolins from Eseka and Dibamba-Cameroon as an optimization additive of CEM I Portland cement mortar","authors":"Arlin Bruno Tchamba,&nbsp;Jongie Placide Esunsen,&nbsp;Nguo Sylvestre Kanouo,&nbsp;Linda Lekuna Duna,&nbsp;Jérôme Dikwa,&nbsp;Michel Mbessa,&nbsp;Guy Molay Tchapga Gnamsi,&nbsp;Blaise Mimpouo,&nbsp;Charles Bwemba,&nbsp;George Elambo Nkeng","doi":"10.1002/ces2.10239","DOIUrl":"10.1002/ces2.10239","url":null,"abstract":"<p>The present study deals with two kaolins from Eseka and Dibamba-Cameroon to determine their potential suitability as additive of CEM I 42.5R and to optimize the properties of cement in the sense to promote low-carbon cement. X-ray diffractometry was used to establish the mineralogical composition of two kaolins. X-ray fluorescence was carried out to determine the chemical composition of kaolins and cement. Fine metakaolin powders obtained at 700°C were used as additive in CEM I 42.5R. Furthermore, consistency, setting time, water absorption, compressive and flexural test, and shrinkage test were evaluated. Scanning electron microscopy analysis was carried out to evaluate the microstructure variation. The substitution of CEM I with metakaolin resulted in a considerable increase in compressive and flexural strength from days 7 to 28 at optimum value. The compressive and flexural strengths at 28 days at optimum value of metakaolin increase to 52% and 44%, respectively, explaining the equilibrium oxides in the cement. The maximum values of strength with 20 wt.% MK1 and 30 wt.% MK2 at 7, 14, and 28 days appear in both cases when the ratio of SiO₂/Al₂O₃ is between 2.8 and 2.9. The silica modulus and alumina modulus of cement–metakaolin improved when metakaolin was added. The properties of cement were optimized with a 52% increase in compressive strength at 28 days.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10239","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142692063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic interaction between refractory and low-carbon low-silicon Al-killed steel","authors":"Xiang Zhang,&nbsp;Tianyu Du,&nbsp;Guojun Ma,&nbsp;Yanghui Xu,&nbsp;Dingli Zheng,&nbsp;Mengke Liu","doi":"10.1002/ces2.10240","DOIUrl":"10.1002/ces2.10240","url":null,"abstract":"<p>To investigate the dynamic interaction between refining refractory and low-carbon low-silicon Al-killed steel, the “refractory-molten steel-inclusion” system was analyzed using dynamic erosion experiments and the FactSage database. This study discussed the formation of interfacial layers between various refining refractories and molten steel, as well as the transformation of nonmetallic inclusions in steel. The findings indicate that the interaction between refractories and molten steel produces a distinct interface layer. The influence of various refining refractories on inclusions varies significantly. MgO-C refractory promotes the formation of MgO·Al₂O₃ inclusions in steel, while Al₂O₃-MgO refractory leads to the formation of SiO₂-MnO-Al₂O₃ inclusions. Both Al₂O₃-SiC refractory and Al₂O₃-MgO-C refractory result in Al₂O₃ inclusions with trace levels of MgO. Steel refined with Al₂O₃-MgO-C refractory has increased MgO content within Al₂O₃ inclusions but still does not reach the stoichiometric ratio of MgO·Al₂O₃. As the initial Al content increases, the influence of MgO-C refractory inclusions becomes increasingly noticeable. The average MgO content within the inclusions rises with the reaction duration, achieving as high as 62.9%. The transition path of Al₂O₃ inclusions in molten steel follows “Al₂O₃→MgO·Al₂O₃→MgO.”</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10240","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142692108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the impact of notch shapes on oxide–oxide ceramic matrix composites strength: A computational approach","authors":"Karthikeyan Ramachandran,&nbsp;Aayushi Soni,&nbsp;Doni Daniel Jayaseelan","doi":"10.1002/ces2.10238","DOIUrl":"10.1002/ces2.10238","url":null,"abstract":"<p>This study utilizes finite element analysis (FEA) to explore the effect of standardized notch shapes—triangular, circular, and rectangular on the tensile behavior of oxide–oxide (O–O) ceramic matrix composites (CMCs) across various temperature ranges. Findings reveal that unnotched samples exhibited a superior equivalent stress of ∼425 MPa, closely aligning with experimental values. However, under elevated temperatures of 1000°C and 1200°C, degradation occurs, reaching up to 54% decrease at 1200°C. Notched samples demonstrate similar behavior, with all notches acting as stress concentrators. Analysis of single and double notches highlights that circular notches have the most significant stress concentrators due to their smooth surfaces and lack of sharp edges, in contrast to rectangular and triangular notches. Although all notch types influence stress concentration, the absence of non-sharp corners in circular notches limit stress dissipation, resulting in higher stress concentrations. This trend persists under high temperature as well. The study emphasizes the critical need for a thorough assessment of notch effects, considering their position, orientation, shape, and size, as they significantly affect the mechanical properties of O–O CMCs.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10238","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multifunctional electroless nickel boron composite coatings incorporated by magnesium diboride ceramic particles","authors":"Ferhat Bülbül,&nbsp;Adem Kara","doi":"10.1002/ces2.10237","DOIUrl":"10.1002/ces2.10237","url":null,"abstract":"<p>In this study, the role of MgB₂ in composite coatings is pivotal. Electroless Ni–B plating, a current-free chemical reduction process, deposits nickel–boron coatings. Other than MgB₂, reinforcements like SiC, B₄C, and so forth are used with Ni–B coatings for improved properties. The research focuses on Ni–B/MgB₂ coatings on AISI 4140 steel using electroless deposition and annealing at different temperatures. Initially, the coating appears dense and amorphous, transforming into worm-like structures through crystallization with MgB₂. Higher annealing temperatures lead to brush-like, feathery, and oyster mushroom structures, forming crystalline nickel boron compounds and oxide phases due to synergy. Interestingly, the newly introduced phases disrupt friction patterns nonlinearly, which is linked to MgB₂’s ceramic nature and reinforcement quantity. Conversely, incorporating MgB₂ and annealing-induced intermetallic phases notably enhances hardness (up to 6) and improves hydrophilicity and antibacterial traits in the coating.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10237","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}