International Journal of Ceramic Engineering & Science最新文献

{"title":"Evaluating the sintering behaviors of ceramic oxide powders processed via binder jet additive manufacturing","authors":"Edgar Mendoza Jimenez,&nbsp;Bashu Aman,&nbsp;Olivia Ehrman,&nbsp;Jack Beuth,&nbsp;B Reeja-Jayan","doi":"10.1002/ces2.10236","DOIUrl":"10.1002/ces2.10236","url":null,"abstract":"<p>Binder jet additive manufacturing is well suited for fabricating large (order of cm) and geometrically complex ceramic preforms. However, the main challenge in producing ceramic oxide parts via binder jetting is the high-temperature postprocess tasked with eliminating internal porosity to achieve full densities. In this work, we demonstrate the ability to produce oxide ceramic parts with desirable densities by sintering binder jetted preforms. We investigate the sintering behavior of binder jetted preforms composed of three oxide powders with distinct morphologies: ball-milled alumina, gas-atomized silica, and sintered-agglomerated zirconia. We fabricate the preform samples using a commercial binder jetting system and a conventional die-pressing technique to understand the effect of starting densities. Furthermore, we parametrize the heating profiles to understand the effect of sintering temperature, sintering duration, and heating rate on each powder's densification behavior, microstructure, and phase composition. Results show the relatively low starting densities within the binder jetted preforms caused the onset sintering temperature to be higher than what is documented in conventional sintering studies. As expected, we observed sintered densities increase with respect to sintering temperature and duration. These findings were utilized to downselect sintering parameters capable of achieving high densities (&gt;96%). Herein, this study validates the sintering of binder jetted preforms as a suitable way to manufacture ceramic parts, regardless of powder morphologies, thereby increasing the robustness of the supply chain involved in additive manufacturing of ceramic oxides.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10236","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685276","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":"Properties of ceramic membranes obtained from kaolinitic clay mixed with palm and mango wastes from Cameroon: Application to wastewater treatment from breweries","authors":"Yacouba Mfomboum Kouotou,&nbsp;André Njoya,&nbsp;Ibrahim Cherif Mountapbeme,&nbsp;Saliou Njuhou,&nbsp;Pelagie Syapnjeu Kamgang,&nbsp;Mohamed Mouafon,&nbsp;Dayirou Njoya,&nbsp;Daniel Njopwouo","doi":"10.1002/ces2.10229","DOIUrl":"10.1002/ces2.10229","url":null,"abstract":"<p>This work focuses on the development of new ceramic membranes based on mixtures of low-cost and locally available raw materials such as kaolinitic clay and additives such as palm kernel shells and mango seed shells, which are used as pore-forming agents to increase pore size, and on their efficiencies in rejecting organic and inorganic pollutants from brewery wastewater. The physical and chemical properties of raw materials were characterized via X-ray diffraction, scanning electron microscopy, differential thermal analysis/thermogravimetry, energy dispersive X-ray, and Fourier transform infrared spectrophotometry. Sintering was performed at 1100°C, and the permeability and mechanical properties of circular membranes were determined. The membrane filtration operation was used to assess the physicochemical parameters of the wastewater. The membrane composed of 85% kaolinite and 15% mango seed shells showed the best performance. The effective treatment of the breweries wastewater reduced the level of contamination by organic pollutants in the discharge water, with a reduction in concentration from 700 to 14 mg O₂ L^‒1 of chemical oxygen demand and 250 to 06 mg O₂ L^‒1 of biological oxygen demand for 5 days, representing elimination rates of 98% and 97.6%, respectively. The treated water is alkaline, with a reduction in pH from 10.79 to 7.77. Suspended matter, turbidity, and electrical conductivity had removal rates of 88%, 90.6%, and 99.8%, respectively. A significant reduction in the salinity of this wastewater contributed to sodium and chloride ion rejection rates of 93% and 79%, respectively, which is an important result for good reuse of the treated water in agriculture and domestic work.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10229","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142170324","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":"Material selection and manufacturing for high-temperature heat exchangers: Review of state-of-the-art development, opportunities, and challenges","authors":"Corson L. Cramer,&nbsp;Edgar Lara-Curzio,&nbsp;Amy M. Elliott,&nbsp;Trevor G. Aguirre,&nbsp;Bola Yoon,&nbsp;Brian A. Fricke,&nbsp;Vivek Rao,&nbsp;Prashant Jain,&nbsp;Kashif Nawaz","doi":"10.1002/ces2.10230","DOIUrl":"10.1002/ces2.10230","url":null,"abstract":"<p>Many energy systems demand heat transfer at high temperatures to keep up with high demand for power, so high-temperature material that can perform and last under these harsh conditions is needed for heat exchangers. The engineering requirements for these high-temperature heat exchanger material call for high thermal conductivity, high resistance to fracture, high resistance to creep deformation, environmental stability in environments associated with the application, and high modulus of elasticity while maintaining low cost to make and maintain. Naturally, ceramics are a good solution for this endeavor. In the past, high-temperature heat exchangers made from ceramics have been used. We provide examples of ceramics in relevant heat exchange applications and provide motivation where additive manufacturing (AM) can improve efficiency. AM for the relevant material is under development, and we provide insight on the AM of ceramic materials and examples of AM heat exchangers keeping cost in mind. The motivation of the review paper is to provide a framework for material and manufacturing selection for high-temperature heat exchangers for AM to keep up with the demand for better efficiency, better material, better manufacturing, and cost moving forward with AM technology in high-temperature ceramic heat exchangers.</p>","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"6 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10230","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142170273","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":"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":"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":"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}