Injection molding of ultra-fine Si3N4 powder for gas-pressure sintering
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- 作者：Xian-feng Yang ; Jiang-hong Yang ; Xie-wen Xu…
- 关键词：ceramic materials ; silicon nitride ; injection molding ; sintering ; near net shaping
- 刊名：International Journal of Minerals, Metallurgy, and Materials
- 出版年：2015
- 出版时间：June 2015
- 年：2015
- 卷：22
- 期：6
- 页码：654-659
- 全文大小：679 KB
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[24]S. Krug, J.R.G. Evans, and J.H.H. ter Maat, Residual stresses and cracking in large ceramic injection mouldings subjected to diff - 作者单位：Xian-feng Yang (1)
Jiang-hong Yang (1)
Xie-wen Xu (1)
Qi-cheng Liu (1)
Zhi-peng Xie (2)
Wei Liu (2)
1. College of Physics and Electronics Science, Changsha University of Science and Technology, Changsha, 410014, China
2. School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China - 刊物类别：Chemistry and Materials Science
- 刊物主题：Materials Science
Metallic Materials
Mineral Resources - 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
- ISSN：1869-103X
文摘
The ceramic injection molding technique was used in the gas-pressure sintering of ultra-fine Si3N4 powder. The feedstock’s flowability, debinding rate, defect evolution, and microstructural evolution during production were explored. The results show that the solid volume loading of less than 50vol% and the surfactant mass fraction of 6wt% result in a perfect flowability of feedstock; this feedstock is suitable for injection molding. When the debinding time is 8 h at 40°C, approximately 50% of the wax can be solvent debinded. Defects detected during the preparation are traced to improper injection parameters, mold design, debinding parameters, residual stress, or inhomogeneous composition distribution in the green body. The bulk density, Vickers hardness, and fracture toughness of the gas-pressure-sintered Si3N4 ceramic reach 3.2 g/cm3, 16.5 GPa, and 7.2 MPa·m1/2, respectively.