Densification behaviour of oxide-coated silicon nitride powders |
| |
| Affiliation: | 1. Department of Metal Education, Technical Education Faculty, Sakarya University, Esentepe Kampus, 54187 Sakarya, Turkey;2. School of Chemical Engineering and Advanced Materials, University of Newcastle upon Tyne, Newcastle upon Tyne NE1 7RU, UK;1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. V. I. Vernadskii Institute of General and Inorganic Chemistry of the Ukrainian NAS, pr. Palladina 32/34, 03142, Kyiv, Ukraine;2. M.P. Semenenko Institute of Geochemisty, Mineralogy and Ore Formation of the Ukrainian NAS, pr. Palladina 34, 03142, Kyiv, Ukraine;1. Department of Mechanical Engineering, Pohang University of Science and Technology, Republic of Korea;2. Department of Advanced Nuclear Engineering, Pohang University of Science and Technology, Republic of Korea;3. Advanced Metallic Materials Research, Research Institute of Industrial Science and Technology, Republic of Korea;4. Powder & Ceramics, Korea Institute of Materials Science, Republic of Korea;1. Department of Inorganic Chemistry, Institute of Chemical Technology, Technická 5, Prague 6 166 28, Czech Republic;2. Institute of Physics, The Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 00 Prague 6, Czech Republic;1. Department of Civil, Environmental and Mechanical Engineering, University of Trento, Via Mesiano 77, I-38123 Trento, Italy;2. Institute of Fundamental Technological Research (IPPT), Pawinskiego 5B, 02-106 Warsaw, Poland |
| |
| Abstract: | Powder coating has been explored as a method of incorporating sintering additives into a ceramic powder. This procedure has been explored in the case of Si3N4 powders coated with thin layers of MgO.The effectiveness of the powder coating technique has been evaluated by comparing the powder properties, densification behaviour, microstructure and mechanical properties of coated Si3N4 powders with identical powders in which the additive oxide has been added in particulate form. It is concluded that the powder coating technique is an excellent method of homogeneously incorporating minor amounts of sintering additive into a powder. The coated powder exhibited improved homogeneity, and gave good green compact density, high green strength, and faster densification rate. Moreover, coated powders densified more easily by pressureless sintering and showed a more homogeneous microstructure, higher strength and faster densification rates, compared with materials prepared using mixed oxide powders. Significant improvements in hardness and fracture toughness were observed for the coated powders. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
