ホットプレス法により作製したALON基複合セラミックスの特性

概要

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Microstructure and mechanical properties of hot-pressed ALON-based composite ceramics were investigated. Microstructure of hot-pressed bodies prepared from a starting mixture of Al_2O_3, AlN and BN, consisted of γ-ALON phase as a matrix and a homogeneously distributed BN phase. The γ-ALON phase was discontinuous in a composite with BN amount >20 vol%. However, addition of 2 vol% Y_2O_3 as sintering aid made the microstructure to maintain a continuous γ-ALON network even for BN addition >20 vol%. It is considered that grain growth of the γ-ALON phase was enhanced by the addition of Y_2O_3. The fiexural strength of the hot-pressed bodies decreased with increasing the amount of BN addition up to 20 vol%, however, addition of BN >50 vol% resulted in an increase of strength up to 80- 100 MPa. The thermal shock resistance of all samples tested was about 200℃. However, strength degradation due to thermal shock decreased with increasing the BN fraction. It was considered that the mechanical properties of hot-pressed ALON-based composite ceramics are significantly affected by the formation of BN phase through the pressurized sintering.
社団法人日本セラミックス協会の論文
2002-07-01