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-Sialon 세라믹스에서의 주상형 입자성장 KCI 등재

Growth of Elongated Grains in '-Sialon Ceramics

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한국분말야금학회지 (Journal of Korean Powder Metallurgy Institute)
한국분말재료학회(구 한국분말야금학회) (Korean Powder Metallurgy Institute)
초록

The effects of the starting particle size and / phase transformation during sintering process on the microstructure evolution of Yttrium -Sialon ceramics were investigated. As-received powder (mean particle size: 0.54m) and classified powder(mean particle size: ) were used as starting powders. With decreasing the starting particle size, the growth of elongated grains was enhanced, which resulted in the whisker -like microstructure with elongated grains. These results were discussed in relation to the two-dimensional nucleation and growth theory. In the specimen heat treated at for 10h before sintering at for 1h under 40atm(2-step sintering), the grain size was smaller than of the 1-step sintering at 195 for 1h. However, bimodal microstructure evolution were not not remarkable in both sample, which is ascribed to the -phase contents existing in starting powder.

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