Effect of α to β (β') Phase Transition on the Sintering of Silicon Nitride Ceramics |
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| Authors: | Dong-Duk Lee Suk-Joong L Kang Gunter Petzow Duk N Yoon |
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| Affiliation: | Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Cheongryang, Seoul, Korea, and Max-Planck-Institut fur Metallforschung, Pulvermetallurgisches Laboratorium, 7000 Stuttgart 80, Federal Republic of Germany |
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| Abstract: | By using α-Si3N4 and β-Si3N4 starting powders with similar particle size and distribution, the effect of α-β (β') phase transition on densification and microstructure is investigated during the liquid-phase sintering of 82Si3N4·9Al2O3·9Y2O3 (wt%) and 80Si3N4·13Al2O3·5AIN·5AIN·2Y2O3. When α-Si3N4 powder is used, the grains become elongated, apparently hindering the densification process. Hence, the phase transition does not enhance the densification. |
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| Keywords: | phase transitions densification microstructure silicon nitride sintering |
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