期刊
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
卷 22, 期 6, 页码 654-659出版社
SPRINGER
DOI: 10.1007/s12613-015-1119-6
关键词
ceramic materials; silicon nitride; injection molding; sintering; near net shaping
类别
资金
- National Nature Science Foundation of China [51102024, 21276028]
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 40A degrees 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/cm(3), 16.5 GPa, and 7.2 MPa center dot m(1/2), respectively.
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