International Journal of Ceramic Engineering & Science最新文献_第8页

Low-temperature synthesis of HfC/HfO2 nanocomposites from a commercial single-source precursor 商业单源前驱体低温合成HfC/HfO2纳米复合材料

International Journal of Ceramic Engineering & Science Pub Date : 2023-08-02 DOI: 10.1002/ces2.10187

Shakir Bin Mujib, Saravanan R. Arunachalam, Gurpreet Singh

{"title":"Low-temperature synthesis of HfC/HfO2 nanocomposites from a commercial single-source precursor","authors":"Shakir Bin Mujib, Saravanan R. Arunachalam, Gurpreet Singh","doi":"10.1002/ces2.10187","DOIUrl":"https://doi.org/10.1002/ces2.10187","url":null,"abstract":"A liquid-phase polymer-to-ceramic approach is reported for the synthesis of hafnium carbide (HfC)/hafnium oxide (HfO2) composite particles from a commercial precursor. Typically, HfC ceramics have been obtained by sintering of fine powders, which usually results in large particle size and high porosity during densification. In this study a single-source liquid precursor was first cured at low temperature and then pyrolyzed at varying conditions to achieve HfC ceramics. The chemical structure of the liquid and cured precursors, and the resulting HfC ceramics was studied using various analytical techniques. The nuclear magnetic resonance and Fourier transform infrared spectroscopy indicated the presence of partially hydrated hafnium oxychloride (Hf–O–Cl·nH2O) in the precursor. Scanning electron microscopy of the resulting HfC crystals showed a size distribution in the range of approx. 600–700 nm. The X-ray diffraction of the pyrolyzed samples confirmed the formation of crystalline HfC along with monoclinic-HfO2 and free carbon phase. The formation of HfO2 in the ceramics was significantly reduced by controlling the low-temperature curing temperature. Pyrolysis at various temperatures showed that HfC formation occurred even at 1000°C. These results show that the reported precursor could be promising for the direct synthesis of ultrahigh temperature HfC ceramics and for precursor infiltration pyrolysis of reinforced ceramic matrix composites.","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"5 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10187","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50119764","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}

引用次数: 0

Intrinsic defects generated by iodine during TiO2 crystallization and its relationship with electrical conductivity and photoactivity 碘在TiO2结晶过程中产生的本征缺陷及其与导电性和光活性的关系

International Journal of Ceramic Engineering & Science Pub Date : 2023-07-24 DOI: 10.1002/ces2.10186

Andre A. Bernardes, Andre L. da Silva, Bruno Ramos, Fabio C. Fonseca, Douglas Gouvêa

{"title":"Intrinsic defects generated by iodine during TiO2 crystallization and its relationship with electrical conductivity and photoactivity","authors":"Andre A. Bernardes, Andre L. da Silva, Bruno Ramos, Fabio C. Fonseca, Douglas Gouvêa","doi":"10.1002/ces2.10186","DOIUrl":"https://doi.org/10.1002/ces2.10186","url":null,"abstract":"Defect formation during synthesis is one of the strategies used to improve the photoactivity of polycrystalline semiconductors such as titanium dioxide (TiO2). Defects can modify the electronic structure of TiO2 and change the surface of the interaction between the photocatalyst and the reactants. In this study, TiO2 relationship between processing in the presence of iodine and the consequent formation of intrinsic defects were explored. TiO2 nanoparticles were synthesized using the polymeric precursor method and exposed to iodine ions at concentrations up to 5 mol%. After calcination at 350°C, detailed chemical analyses revealed that iodine was absent in the samples. However, the TiO2 properties, such as specific surface area, crystallite sizes, and specific grain boundary area, were affected. Further experiments, such as electron paramagnetic resonance, diffuse reflectance, optical measurements, and electrochemical impedance spectroscopy indicated the presence of defects in the iodine-processed samples. These defects directly influenced the electrical properties of the material, which affected the photoactivity, measured by the degradation of acetaminophen.","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"5 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10186","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50119016","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}

引用次数: 0

Synthesis and assessment of properties of ZrB2 nanopowder utilizing boro/carbothermal reduction method 硼/碳热还原法制备ZrB2纳米粉体及其性能评价

International Journal of Ceramic Engineering & Science Pub Date : 2023-07-21 DOI: 10.1002/ces2.10185

Omid khanali, Mehri Mashhadi, Alireza Salim Pour, Farhad Farhang Rad

{"title":"Synthesis and assessment of properties of ZrB2 nanopowder utilizing boro/carbothermal reduction method","authors":"Omid khanali, Mehri Mashhadi, Alireza Salim Pour, Farhad Farhang Rad","doi":"10.1002/ces2.10185","DOIUrl":"https://doi.org/10.1002/ces2.10185","url":null,"abstract":"The reason of this study is to synthesize ZrB2 nano powder utilizing boric acid and phenolic resin. Within the study of zirconia as a source of zirconium, boric acid was used as a source of boron and phenolic resin as a carbon source. The theoretical and experimental studies of ZrB2 were synthesized by boro/carbothermal diminishment from the novel sol–gel technology. The zirconia powder was crushed for 8 h and in conjunction with different molar proportions of boric acid, in this consider, a kinetic demonstrate for reactions creating ZrB2 was built up based on thermodynamic analysis. The resultant powder was synthesized in a neutral atmosphere controlled in 1450°C and 1550°C. After it was also observed that, with the increase of molar proportion of H3BO3, the reaction delivered ZrB2 powders in high amount of the boron reaction. The compound was analyzed by an X-ray diffraction technique and found to be ZrB2 powder that was synthesized with the purity of approximately 98%.","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"5 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10185","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50153056","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}

引用次数: 0

Prospective view of nitride material synthesis 氮化材料合成前景展望

International Journal of Ceramic Engineering & Science Pub Date : 2023-07-21 DOI: 10.1002/ces2.10184

Nathan Stoddard, Siddha Pimputkar

引用次数: 0

Influence of preparation parameters on the properties of SiC abrasive stones and their applications 制备参数对SiC磨石性能的影响及其应用

International Journal of Ceramic Engineering & Science Pub Date : 2023-07-12 DOI: 10.1002/ces2.10183

S. B. Hanna, N. A. Ajiba, T. S. Mansour

{"title":"Influence of preparation parameters on the properties of SiC abrasive stones and their applications","authors":"S. B. Hanna, N. A. Ajiba, T. S. Mansour","doi":"10.1002/ces2.10183","DOIUrl":"https://doi.org/10.1002/ces2.10183","url":null,"abstract":"The preparation of highly efficient and low cost abrasive stones has gained considerable interest in the last few years from the industrial and academic research societies. Meanwhile, composition of such abrasive stones material has played a significant role on its physicochemical, mechanical properties and cost. In this work, series of magnesium oxychloride cement samples were prepared by adding MgCl2 solutions to magnesia, where H2O/MgCl2 was 13:1, 15:1, and 17:1, while MgO/ MgCl2 molar ratio was fixed at 7:1 for all samples. During mixing, two grades of SiC were added separately in proportions of 20, 25, and 30 mass percentage. A comprehensive characterization including bulk density, compressive strength, abrasion resistance, and polishing performance were carried out to the prepared composites samples. This was followed by studying their mineral composition and the possible use in grinding and polishing processes of marble slabs. Interestingly, the obtained characterization results demonstrated that among the different prepared composite materials, 25 mass percent SiC-containing samples showed the best physicochemical and mechanical properties. Notably, the degree of fineness of SiC has affected the overall properties of SiC composite. When very fine SiC type was used and the water content was reduced, consequently, the samples bulk density and abrasion resistance increased. Phase 5 (5Mg(OH)2.MgCl2.8H2O) and silicon carbide, as the main phases with a minor amount of magnesia, were detected in the samples. From the economic point of view, the obtained result in our study is promising for its high performance-low cost for grinding and polishing of marble slabs in the industrial fabrication.","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"5 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10183","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50149925","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}

引用次数: 0

Acoustic properties of piezoelectric cubic crystals 压电立方晶体的声学特性

International Journal of Ceramic Engineering & Science Pub Date : 2023-07-01 DOI: 10.1002/ces2.10182

Arthur Ballato, John Ballato

{"title":"Acoustic properties of piezoelectric cubic crystals","authors":"Arthur Ballato, John Ballato","doi":"10.1002/ces2.10182","DOIUrl":"https://doi.org/10.1002/ces2.10182","url":null,"abstract":"This paper is offered as a complementary adjunct to the many treatments of the electronic and photonic properties of cubic III–V and II–VI compounds appearing in the literature. These crystals typically exhibit piezoelectricity, due to the molecular dissymmetry, thereby allowing the inclusion of classical mechanical/acoustic features along with the quantum. We discuss the history of this modality and then illustrate its use by applying it to an electro-elastic problem that has the estimable virtues of having an exact solution, along with wide practical applicability: determination of the piezocoupling values governing the excitation of thickness vibrations in thin cubic films or plates of arbitrary crystallographic orientation by electric fields directed either along, or lateral to, the thickness. Explicit results are given for orientations along the great-circle paths connecting the principal directions [100], [110], and [111]. The formalism is then applied to GaAs as an example; it is further demonstrated that various results, such as the orientational variations of piezocoupling factors, are generally applicable to other members of the III–V and II–VI families by scaling. Ancillary aspects, such as errors due to misorientations, nonlinearities, and equivalent circuit representations, are described and discussed. This work is dedicated to Gerald W. Farnell (1925–2015), Prof. Emeritus, McGill University, Montréal, Canada.","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"5 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10182","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50117724","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}

引用次数: 0

Low thermal conductivity lanthanum zirconate nanofibrous membranes for thermal insulation 低热导率锆酸镧纳米纤维隔热膜

International Journal of Ceramic Engineering & Science Pub Date : 2023-06-20 DOI: 10.1002/ces2.10181

Hengchang Wang, Jie Xu, Mingyue Wei, Xuanyu Meng, Lang Lin, Xiaoying Feng, Feng Gao

引用次数: 0

Evaluating the impact of journals in the ceramic sciences 评估陶瓷科学期刊的影响力

International Journal of Ceramic Engineering & Science Pub Date : 2023-05-24 DOI: 10.1002/ces2.10180

Maziar Montazerian, John C. Mauro

{"title":"Evaluating the impact of journals in the ceramic sciences","authors":"Maziar Montazerian, John C. Mauro","doi":"10.1002/ces2.10180","DOIUrl":"https://doi.org/10.1002/ces2.10180","url":null,"abstract":"This article examines various methods for evaluating the impact of journals in the ceramic sciences, including the H-index, journal impact factor (JIF), and the recently introduced MZE-index (defined by Montazerian–Zanotto–Eckert). We evaluate the performance of 31 reputable journals in ceramic science and technology and find that the JIF and H-index (which correlate to prolificacy and visibility) rise in tandem with the number of documents (N) each journal publishes. As an alternative metric, the MZE-index is used to distinguish the journals that stand at, above, or below the average of the field. It aids in better understanding the reputation and visibility of the journals relative to their peers by providing a fairer comparison of journals with different publication records and citation patterns and allowing for a more accurate comparison of their visibility compared to the average of the field. We also argue that beyond the commonly used JIF and H indices, other bibliometric indicators like MZE and peer review based on a journal's established reputation are necessary to determine their quality and choose them as the publication venue.","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"5 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10180","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50143201","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}

引用次数: 0

Use of waste husk from millet grain cultivation in the production of fired clay bricks 谷子秸秆在烧结粘土砖生产中的应用

International Journal of Ceramic Engineering & Science Pub Date : 2023-05-24 DOI: 10.1002/ces2.10179

Aaron N. Adazabra, G. Viruthagiri

{"title":"Use of waste husk from millet grain cultivation in the production of fired clay bricks","authors":"Aaron N. Adazabra, G. Viruthagiri","doi":"10.1002/ces2.10179","DOIUrl":"https://doi.org/10.1002/ces2.10179","url":null,"abstract":"The consumption of colossal quantities of materials in the building industry has advanced the swift depletion of clean clay reserves. The use of organic additives in brick production is conserving clay resources. In addition, in some cases, it can lead to improvements in some material properties, such as decreasing thermal conductivity and increasing the capacity of the ceramic material in terms of thermal insulation. In the present investigation, waste millet husk (WMH) was incorporated in different proportions to clays to ascertain its influence on the fired brick properties. The raw materials were characterized for their physical, chemical, and thermal properties and found suitable for use in fired brick production. Additionally, the prepared modeled brick samples were tested for their physico-mechanical properties. The results indicated that linear shrinkage and weight loss increased, whereas bulk density decreased from 2.06 to 1.58 g/cm3 depending on WMH incorporation amount in the clays and firing temperature. Similarly, compressive strength reduced by up to 68%. Thermal conductivity beneficially reduced by 42% with the addition of 16 wt.% of WMH. The best results in terms of mechanical properties were obtained with 4 wt.% of the WMH. In terms of thermal insulation, the best results were exhibited in the samples admixed with 16 wt.% of WMH. The results showed that porosity and bulk density were critical determining factors that directly influence the bricks physico-mechanical properties.","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"5 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10179","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50143200","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}

引用次数: 0

Institutional and technical history of requirements-based strategic armor ceramics basic research leading up to the multiscale material by design materials in extreme dynamic environments (MEDE) program. Part I. Brief history of institutional changes and relevant major research programs 基于需求的战略装甲陶瓷基础研究的机构和技术历史，导致了极端动态环境下材料的多尺度逐设计（MEDE）计划。第一部分制度变迁简史及相关重大研究项目

International Journal of Ceramic Engineering & Science Pub Date : 2023-04-26 DOI: 10.1002/ces2.10176

James W. McCauley

{"title":"Institutional and technical history of requirements-based strategic armor ceramics basic research leading up to the multiscale material by design materials in extreme dynamic environments (MEDE) program. Part I. Brief history of institutional changes and relevant major research programs","authors":"James W. McCauley","doi":"10.1002/ces2.10176","DOIUrl":"https://doi.org/10.1002/ces2.10176","url":null,"abstract":"History, beginning in the late 1960s during the Vietnam war, of the institutional changes that took place because of various military operations and the resulting changes in policies and requirements in the Department of Defense and the Army: Army Force XXI, DDRE, and Army After Next; this will include the evolution of personnel and vehicle protection materials and the impact of major DARPA programs. The new requirements emphasized light weight and changes in the basic research approach, which led to the approval of a strategic research objective, “Armor Materials by Design.” At the same time, there were other National planning activities, workshops, and conferences advocating for the armor materials by design vision and the use of “figures of merit.” The Army Research Laboratory responded to these initiatives by initiating an “Enterprise for Multiscale Research of Materials” leading to the funding of a revolutionary new collaborative research program on “materials in extreme dynamic environment.” The role of the ARL Materials Center of Excellence will also be included.","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"5 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10176","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50144083","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}

引用次数: 0