International Journal of Ceramic Engineering & Science最新文献_第9页

Glass-ceramic: Controlled crystallization of glasses obtained from biomass ash 玻璃陶瓷:从生物质灰中获得的玻璃的可控结晶

International Journal of Ceramic Engineering & Science Pub Date : 2023-09-09 DOI: 10.1002/ces2.10191

Thais Samira Souza Dias, Thariany Sanches Leme, Luiz Fernando dos Santos, Renata da Silva Magalhães, Gleyson Tadeu de Almeida Santos, Silvio Rainho Teixeira, Agda Eunice de Souza

{"title":"Glass-ceramic: Controlled crystallization of glasses obtained from biomass ash","authors":"Thais Samira Souza Dias, Thariany Sanches Leme, Luiz Fernando dos Santos, Renata da Silva Magalhães, Gleyson Tadeu de Almeida Santos, Silvio Rainho Teixeira, Agda Eunice de Souza","doi":"10.1002/ces2.10191","DOIUrl":"10.1002/ces2.10191","url":null,"abstract":"In this work, vitreous material was produced, using ash from burning wood in a boiler, to obtain a glass-ceramic with the gehlenite phase. The glass obtained by melt-quenching at 1450°C was characterized by differential scanning calorimetry and other techniques to determine the glass transition and crystallization temperatures, and crystallization kinetics were investigated using the Kissinger model. Tablets prepared with glass powder were treated at 970, 990, 1074, and 1120°C for 1 h, to obtain the glass-ceramic material. The phase identified by X-ray diffraction was gehlenite, with two crystalline structures coexisting in the sample. According to the kinetics study, the phase with a tetragonal structure had a lower crystallization activation energy, and therefore, it may have been the first phase to be formed in the material. Scanning electron microscopy images revealed crystalline regions within the glassy matrix with a lamellar microstructure, with no geometrically defined morphology and no morphological or microstructural distinction, suggesting that both gehlenite phases coexist without apparent distinctions in the glass-ceramic. The best results for water absorption, apparent porosity, and apparent density were for the glass-ceramic sample sintered at 990°C, whose values were respectively 0.1, 0.29, and 2.89 g/cm3.","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"5 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ceramics.onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10191","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136193027","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

The onset of selective laser flash sintering in undoped and doped lanthanum chromite 未掺杂和掺杂镧铬铁矿选择性激光闪烧的开始

International Journal of Ceramic Engineering & Science Pub Date : 2023-09-01 DOI: 10.1002/ces2.10189

Lezli Matto, Deborah Hagen, Joseph J. Beaman, Desiderio Kovar

引用次数: 0

Deposition of layered double hydroxide on non-pretreated carbon cloth using lactate salts as raw materials 以乳酸盐为原料，在未经预处理的炭布上沉积层状双氢氧化物

International Journal of Ceramic Engineering & Science Pub Date : 2023-08-27 DOI: 10.1002/ces2.10190

Shingo Machida, Kaishi Hasegawa, Ken-Ichi Katsumata, Atsuo Yasumori

引用次数: 0

Early age properties and water resistance of calcium hydroxide modified volcanic ash-based phosphate geopolymer binders 氢氧化钙改性火山灰基磷酸盐地聚合物粘结剂的早期性能和耐水性

International Journal of Ceramic Engineering & Science Pub Date : 2023-08-26 DOI: 10.1002/ces2.10188

Jean Noël Yankwa Djobo, Tamino Hirsch, Dietmar Stephan

{"title":"Early age properties and water resistance of calcium hydroxide modified volcanic ash-based phosphate geopolymer binders","authors":"Jean Noël Yankwa Djobo, Tamino Hirsch, Dietmar Stephan","doi":"10.1002/ces2.10188","DOIUrl":"10.1002/ces2.10188","url":null,"abstract":"This work aims to improve the early age characteristics and water resistance of volcanic ash-based phosphate geopolymer materials by modifying the chemistry of the binder with calcium hydroxide (CH). Phosphate geopolymer binders with Ca/P molar ratios ranging from 0.49 to 0.80 were prepared. Then the early and late age physical properties were then determined. The hardened binder was characterized by various analytical techniques involving XRD, TGA-DSC, and SEM-EDS. The results showed that the use of CH decreases the initial setting time from several hours to less than 5 min. At the same time, the 1 d compressive strength was increased from 0 to 15 MPa with the increase in the Ca/P molar ratio. Moreover, the slow dissolution rate of volcanic ash was responsible for the low strength at an early age but beneficial to improving the geopolymerisation with time. This favored the high strength of the control phosphate geopolymer, which reached 52.5 MPa at 56d and was higher than those with CH (28.5–45.2 MPa). However, the control phosphate geopolymer had poor water resistance, with strength retention ranging from 21%–57% compared to 76%–90% for phosphate geopolymer with CH. This is because of the leaching of the reactive phase underwater that inhibits further reaction progress. In addition, the modification of the binder chemistry with CH leads to the formation of new calcium phosphate phases that also contribute to enhancing water resistance.","PeriodicalId":13948,"journal":{"name":"International Journal of Ceramic Engineering & Science","volume":"5 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ceramics.onlinelibrary.wiley.com/doi/epdf/10.1002/ces2.10188","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115427479","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-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