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Journal of Ceramic Science and Technology 1/2022
Vol. 13, No. 1 · May 2022
Effect of the Addition of Ultrafine Powders on the Microstructure and Mechanical Properties of TiCN-Based Cermets
Y. Yang, Y. Yang, W. Dang, W. Dang, J. Liu, J. Liu, H. Zhang, H. Zhang, S. Gu, S. Gu, C. Lei, C. Lei, Y. Chen, Y. Chen
Pages 15-22 · DOI: 10.4416/JCST2021-00011
In this study, ultrafine titanium carbonitride (TiCN) powders were prepared with an improved carbothermal reduction method. The microstructure and mechanical properties of TiCN-based cermets fabricated with different contents of ultrafine powders were investigated by means of scanning electron microscopy, X-ray diffraction, Vickers hardness and three-point bending tests. With the addition of ultrafine TiCN powder, the "black core-grey rim" phase was refined, and the "white core-grey rim" phase was gradually produced. The optimum content of ultrafine TiCN powder is 20 wt%. The cermets' hardness …
Contributions to Dielectric Constant Enhancement in Thin-Film Metal-Insulator-Metal
D.S. Krueger, Z.J. Legenzoff, J.A. Wolf, J.B. Claypool, R.W. Schwartz, W. Huebner
Pages 1-8 · DOI: 10.4416/JCST2021-00001
Thin-film metal-insulator-metal capacitors were fabricated with varying dielectric and electrode thicknesses and areas. Measurement of the dielectric properties of the capacitors consistently yielded higher than predicted capacitance values, which prompted the exploration of three factors that could enhance the capacitance. Modeling of the fringing capacitance and field enhancement due to the capacitor geometry, both yield capacitance gains, albeit insufficient to fully explain the observed behavior. The possible role of changes in polarizability of the dielectric film constituents, due to the …
Study on the Effect of MgO Addition on the Physical, Mechanical and Thermal Properties of Alumina-Zirconia-Carbon Refractories
M. Abolfazli, M. Hossein Paydar
Pages 9-14 · DOI: 10.4416/JCST2021-00009
In this study, the effect of magnesium oxide addition (0 – 10 wt%) on the microstructure, mechanical properties, corrosion and oxidation resistance of alumina-graphite refractory bodies containing 20 wt% zirconia was investigated. Samples were fabricated by mixing raw materials with phenolic resin as a binder. The powder mixtures were isostatically pressed at 850 bar and sintered at 1 400 °C for 8 h under reducing atmosphere. The results showed that the presence of MgO reduces the bulk density, which causes more slag penetration and thus reduces corrosion resistance. Also, evaluation of the me …
Research on Porcelain Material for Product Design and Manufacturing in Kenya: Assessing SiO2 Al2O3 Content
L. Barongo Ayieng'a, A. Wang, X. Lu, Y. Song, M. Watterson
Pages 23-30 · DOI: 10.4416/JCST2021-00013
This study describes interdisciplinary research with the objective of identifying local raw material resources that can be used for manufacturing high-quality Kenyan porcelain products. The study details experiments on a kaolin raw material (Kisii soapstone) at Jingdezhen Ceramic Institute. A high-temperature, white stoneware slip-casting slurry is developed. X-ray fluorescence (XRF) and X-ray diffraction (XRD) analysis, shrinkage and product assessment tests are used to gauge the material's excellence. A detailed comparative analysis is provided of the SiO2 Al2O3 chemical properties with thos …
Influence of ZrSiO4 on Honeycomb-Structured Vitrified-Bonded Ultrafine Diamond Grinding Wheels
Y. L. Ding, Y. L. Ding, W. P. Miao, W. P. Miao, Y. J. Zhao, Y. J. Zhao, Y. J. Zhao, H. Bao, H. Bao, N. Yan, N. Yan, W. Yang
Pages 31-38 · DOI: 10.4416/JCST2021-00014
To improve the mechanical properties of honeycomb-structured vitrified-bonded ultrafine diamond grinding wheels and prepare high-quality silicon wafers, the effect of ZrSiO4 on the performance of the grinding wheels has been systematically investigated. SEM images reveal the morphology and microstructure of grinding wheels with different amounts of ZrSiO4. Thermal analysis and mechanical properties of the grinding wheel are characterized by means of TG-DSC and bending strength testing, respectively. The surface quality of ground silicon wafers is evaluated with AFM. Results demonstrate that th …
Improved Catalytic Properties of Pt Cluster Supported on Defective Graphene
Y. Huang, Z. Yu, E. Song
Pages 39-44 · DOI: 10.4416/JCST2021-00020
Graphene-supported transition-metal nanoparticles demonstrate extraordinary catalytic activity for CO oxidation. Herein, we have applied the density functional theory to investigate the stability and catalytic properties of a Pt12 cluster adsorbed on a bi-vacancy defective graphene (Pt/graphene). It has been found that the very low energy barrier is only 0.131 eV for the Langmuir-Hinshelwood oxidation process for CO co-adsorbed on a catalyst with an O2 molecule. The following Eley-Rideal oxidation process is carried out with an activation barrier of 0.352 eV. Furthermore, the bi-vacancy site o …
RE2SiO5 (RE=Er, Gd, Y, Yb), Which is More Suitable for the Top-Coat of EBCs: A Problem Clarification via Finite Element Simulation Study
X.W. Sun, X.W. Sun, X. Zhong, Z.C. Hu, Y. Liu, Y. Yang, L. Wang
Pages 45-64 · DOI: 10.4416/JCST2021-00021
As an important surface protection method, environmental barrier coatings (EBCs) have been applied in the aerospace industry. In order to prepare advanced EBCs with low residual stress, high bonding strength, excellent anti-oxidation resistance and long service lifetime by means of APS (Atmospheric Plasma Spraying), the finite element method (FEM) has been used to design and optimize the structure of the EBCs, thereby saving on experimental costs and improving investigation efficiency. The current work focuses on the influence of the top-coat layer (RE2SiO5) and the thickness of the correspond …
