International Journal of Ceramic Engineering & Science最新文献

{"title":"Influence of phosphates on phase formation in alkali-activated MgO-Al2O3-SiO2-P2O5 cements","authors":"Titus Reed,&nbsp;John C. Mauro,&nbsp;Juan Pablo Gevaudan","doi":"10.1002/ces2.10232","DOIUrl":"10.1002/ces2.10232","url":null,"abstract":"<p>The impact of phosphates on phase formation in low Ca alkali-activated materials (AAMs) is investigated using a polymer-assisted sol-gel process to fabricate MgO-Al₂O₃-SiO₂-P₂O₅ cement precursors covering a broad range of compositions activated with sodium hydroxide. X-ray diffraction and magic angle spinning-nuclear magnetic resonance are used to examine the crystalline and amorphous phases that form over 470 days of curing (35°C, 90% relative humidity). The results confirm that Al is preferentially incorporated into hydrotalcite-like layered double hydroxides (LDH) over zeolites. Zeolites form when more Al is present than can be incorporated into the LDH. Little evidence of phosphate incorporation into aluminosilicate networks (such as zeolites or disordered aluminosilicate hydrate) was observed. The phosphates present in the precursor favor reaction with sodium to form water-soluble sodium phosphate phases. In most cases, the remainder of the phosphates become adsorbed to the surface of other phases and are not intercalated into the LDH, though at high phosphate concentrations (26.6 wt. % P₂O₅) and extended curing times (470 days), phosphates are observed to intercalate into LDH phases. These results provide preliminary evidence that phosphates are compatible with low Ca AAMs, which is consequential as there is a growing interest in both the use of AAM and phosphate-based corrosion inhibiter in steel-reinforced concrete.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10232","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141797754","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 \u0000 \u0000 \u0000 MnO\u0000 2\u0000 \u0000 ${text{MnO}}_{2}$\u0000 doping on AC aging characteristics of varistor in arrester","authors":"Zhengzheng Fu,&nbsp;Zongxi Zhang,&nbsp;Songhai Fan,&nbsp;Tao Cui,&nbsp;Donghui Luo,&nbsp;Yiping Jiang,&nbsp;Pengfei Meng,&nbsp;Jingke Guo,&nbsp;Yue Yin","doi":"10.1002/ces2.10235","DOIUrl":"10.1002/ces2.10235","url":null,"abstract":"<p>As the core component of lightning arrester, the performance of ZnO varistor directly affects the protection level of lightning arrester. Under the action of long-term AC voltage, the varistors are prone to AC aging, which leads to the deterioration of its performance parameters and microstructure, resulting in the failure of the varistors. In this paper, the effects of <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mtext>MnO</mtext>\u0000 <mn>2</mn>\u0000 </msub>\u0000 <annotation>${text{MnO}}_{2}$</annotation>\u0000 </semantics></math> doping on the voltammetry and double Schottky barrier characteristics of ZnO varistors under AC were studied by means of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>C</mi>\u0000 <mtext>--</mtext>\u0000 <mi>V</mi>\u0000 </mrow>\u0000 <annotation>$Chbox{--}V$</annotation>\u0000 </semantics></math>, scanning electron microscopy, and energy-dispersive X-ray spectroscopy characteristic testing. The AC accelerated aging test was carried out for 168 h under 135<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msup>\u0000 <mrow></mrow>\u0000 <mo>∘</mo>\u0000 </msup>\u0000 <mi>C</mi>\u0000 </mrow>\u0000 <annotation>$^circtext{C}$</annotation>\u0000 </semantics></math> and 0.85 ratio of peak voltage. The results showed that the introduction of <span></span><math>\u0000 <semantics>\u0000 <msup>\u0000 <mtext>Mn</mtext>\u0000 <mrow>\u0000 <mn>4</mn>\u0000 <mo>+</mo>\u0000 </mrow>\u0000 </msup>\u0000 <annotation>${text{Mn}^{4+}}$</annotation>\u0000 </semantics></math> inhibited the migration of interstitial zinc ions to grain boundaries and decreased the AC aging rate. The aging rate was lowest when 1.5 mol% <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mtext>MnO</mtext>\u0000 <mn>2</mn>\u0000 </msub>\u0000 <annotation>${text{MnO}}_{2}$</annotation>\u0000 </semantics></math> was doped.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10235","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141798297","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":"Spectral emittance measurements for ytterbium disilicate-based environmental barrier coatings","authors":"Michael J. Presby,&nbsp;Sylvie F. Crowell,&nbsp;Jeffrey I. Eldridge,&nbsp;James R. Markham","doi":"10.1002/ces2.10234","DOIUrl":"10.1002/ces2.10234","url":null,"abstract":"<p>The spectral reflectance and transmittance of two free-standing ytterbium disilicate (Yb₂Si₂O₇)—based environmental barrier coatings (EBCs) were measured from 25°C up to 1270°C. The measurements were collected over the spectral range of approximately 2–20 µm. The spectral emittance was then determined through conservation of energy and Kirchhoff's law of thermal radiation. The spectral emittance measurements for the EBCs were then compared to previous measurements for a thermal barrier coating (TBC).</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10234","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141802296","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":"Ability of x-ray computed tomography to resolve critical flaw size in laser-based, paste stereolithography ceramic printing of alumina","authors":"Corson L. Cramer,&nbsp;Andrés Márquez Rossy,&nbsp;Ryan R. Dehoff,&nbsp;Andrew T. Nelson","doi":"10.1002/ces2.10233","DOIUrl":"10.1002/ces2.10233","url":null,"abstract":"<p>Complex alumina parts were printed using vat photopolymerization (VPP), which is a stereolithography-based additive manufacturing (AM) technique used to shape ceramic preforms, or green parts. The critical flaw size was determined using classical fracture mechanics techniques. The strength and fracture toughness were measured and compared to flaws detected in x-ray computed tomography (XCT or CT) distributions as well as the fracture surfaces. The strength was lower compared traditionally made alumina, and that is due to layering effects, slurry defects, and printing defects. The critical flaw size from fracture mechanics was 206 µm. XCT has high enough resolution to detect the critical flaw size and much smaller features, where the average flaw size observed in CT scans was around 80–100 µm. The fracture surfaces indicate that flaws causing failure are larger than that of the critical flaw size (∼300 µm), but fracture surfaces do not show definitive features compared to traditionally made ceramics. Since XCT can observe flaws smaller than the critical flaw size, this method can be used as a screening technique.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10233","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141805819","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":"Application of augmented simplex-centroïd mixture design in developing and optimizing new low-cost microfiltration membranes from clays and cassava peels for bacteria removal","authors":"Ibrahim Cherif Mountapbeme,&nbsp;Emilia Enjema Lyonga Mbamyah,&nbsp;Amadou Pountouenchi,&nbsp;Saliou Njuhou,&nbsp;Mohamed Mouafon,&nbsp;Emma Julienne Augustine Ndzana,&nbsp;Yacouba Mfomboum Kouotou,&nbsp;Gisèle Laure Lecomte-Nana,&nbsp;Dayirou Njoya","doi":"10.1002/ces2.10231","DOIUrl":"10.1002/ces2.10231","url":null,"abstract":"<p>The sharp increase in waterborne diseases due to bacterial contamination is limiting the supply of safe water in developing countries. This study focuses on the development and optimization of a low-cost ceramic membrane based on natural resources and local waste for eliminating bacteria from water. The augmented simplex centroïd mixture design (ASCD) was used. The obtained optimal formulation consisted of 65% Ebebda clay (EB) 18.64% Koutaba clay (KG), and 16.34% cassava peel (PM) with a holding temperature of 1 100°C. The raw materials and membrane were characterized by chemical analysis using X-ray florescence, X-ray diffractometry, Thermal Gravimetric/Differential Scanning Calorimetry (TG/DSC), FTIR, scanning electron microscopy, <i>S</i>_BET, porosity and flexural strength. The optimal membrane has 43.26% of porosity, 7.46 MPa of strength, 0.55 m²/g of specific surface area, an average pore diameter of 1.31 µm and a water permeability of 4 345,87 L h⁻¹ m⁻² bar⁻¹. The ability of the membrane support to retain <i>Pseudomonas aeruginosa</i>, <i>Klebsiella pneumoniae</i>, <i>Salmonella sp</i> and <i>Staphylococcus aureus</i> bacteria present in contaminated water was finally assessed. Retention tests showed 100% of <i>P. aeruginosa</i>, 97.37% of <i>K. pneumoniae</i>, 93.69% of <i>Salmonella sp</i>, and 90% of <i>S. aureus</i>, making this new, less expensive ceramic membrane a potential candidate for the water treatment.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10231","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141806279","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":"Correction to: Acoustic properties of piezoelectric cubic crystals","authors":"Arthur Ballato,&nbsp;John Ballato","doi":"10.1002/ces2.10228","DOIUrl":"10.1002/ces2.10228","url":null,"abstract":"","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10228","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141682353","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":"A facile method for the estimation of ceramic performance in light armor systems","authors":"Jake Ganor","doi":"10.1002/ces2.10227","DOIUrl":"https://doi.org/10.1002/ces2.10227","url":null,"abstract":"<p>Ballistic armor material development has been historically constrained by the limitations of existing predictive models. Traditional approaches, primarily reliant on finite element models, are not only computationally intensive but also often fall short in accurately predicting the ballistic performance of ceramics, particularly with novel materials. This challenge is exacerbated by the lack of clear correlations between a ceramic material's mechanical properties and its ballistic efficacy in existing equations. In this context, we have developed a novel empirical equation that represents a significant shift from conventional methods. This facile formula provides a more cohesive and predictive way to estimate ballistic performance from material mechanical properties, accurately defines performance relations between different material types, and addresses the gaps that have hindered previous methodologies. This new ballistic efficacy equation conclusively answers the old question as to which mechanical properties correlate with performance in light armor systems and opens avenues for the rapid development and optimization of more effective ceramic armor materials.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10227","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141730225","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":"Feasibility of production fired bricks based lateritic soil at very low temperature","authors":"Jordan Valdès Sontia Metekong,&nbsp;Cyriaque Rodrigue Kaze,&nbsp;Elie Kamseu,&nbsp;Florence Uphie Chinje,&nbsp;Thomas Tamo Tatietse","doi":"10.1002/ces2.10225","DOIUrl":"10.1002/ces2.10225","url":null,"abstract":"<p>The present project deals with the production of lateritic soil based bricks under different curing temperatures (28°C–150°C). A fraction of 10–30 wt% amount alkaline solution was added to improve the reactive phase content. The raw materials and hardened products were characterized using X-ray diffraction (XRD), fourrier transform infrared spectroscopy (FTIR), mechanical properties and scanning electron microscope analysis. The results show that the addition of alkaline solution (30%) and the curing temperature (150°C) have a beneficial influence on physical properties (bulk density: 1.77 g/cm³, water absorption: 16.98%, and porosity: 30.13%) and mechanical performances (flexural: 6.61 MPa and compressive: 13.57 MPa). Compared with the code requirements for stabilized earth blocks, the compressive strength was higher than the minimum required. Microstructural investigations were also carried out to confirm the macrostructural properties. The above-mentioned process appears to be a suitable candidate for engineering applications such as the stabilization of earth roads.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10225","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141372360","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":"Porous alumina-based ceramics with very low thermal conductivity prepared by the starch consolidation route","authors":"Julian Alzukaimi,&nbsp;Rafi Jabrah","doi":"10.1002/ces2.10226","DOIUrl":"10.1002/ces2.10226","url":null,"abstract":"<p>Alumina-based porous ceramics were fabricated via the starch consolidation casting route, using titanium oxide as a sintering additive. Alumina-titania-starch slurries with starch contents of 2.5, 5, 7.5, and 10 wt% relative to the alumina-titania system were prepared. Titania was added to the slurries in proportions of 0, 1, 3, and 5 wt%, relative to alumina. The effects of starch and titania contents in the green bodies on the linear and volumetric shrinkage, as well as the total and open porosities of the sintered alumina product, were investigated. The effect of titania addition on mechanical, electrical, and thermal properties of the obtained porous alumina ceramics was studied. Microstructure and pores morphology were characterized by SEM. The alumina-based ceramics obtained had external porosities that varied between 54 and 76 vol%. Thermal conductivities as low as 0.06–0.1 W/m.K were achieved and the volume electrical resistivity ranged from 3.6 to 600 GΩ·m, while compressive strengths up to 2.8 MPa for a titania ratio of 1 wt% were attained.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10226","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141270144","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":"An overview of dental glass–ceramics: From material design to the manufacturing process","authors":"Yongfang Jiang,&nbsp;Changbo Zhang,&nbsp;Jie Xu,&nbsp;Jiamin Xu,&nbsp;Xue-Qing Zhan,&nbsp;Ning Ma,&nbsp;Fang-Chang Tsai","doi":"10.1002/ces2.10224","DOIUrl":"https://doi.org/10.1002/ces2.10224","url":null,"abstract":"<p>As a subserie of the dental ceramic material family, glass–ceramics are favored for their excellent aesthetic properties. The feasibility of current commercially available dental glass–ceramics applications has been proven, while the assurance and development of more functional properties for them are still being explored. Effective utilization of various modification mechanisms by adjusting the chemical composition and microstructure is essential to improve the mechanical properties, aesthetic properties, and other properties such as biocompatibility of dental restorative materials. Among them, the mechanical properties of restorations should take into account the mechanical properties of glass ceramics and the final restoration (restoration and tooth set) in the mechanical behavior. This paper provides an overview of the chemical composition design, classification of microstructure, property requirements, and strengthening methods applied to dental glass–ceramics, including ion exchange, chain effects, heat treatment modulation, and strengthening mechanisms. In addition, research on traditional hot pressing, subtractive manufacturing, and newly developed additive manufacturing in glass–ceramics are systematically presented. Finally, the tendency of dental glass–ceramics was forecasted by analyzing the relationship between glass–ceramic composition, process, and mechanical properties.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10224","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141730074","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}