Effects of Additives to Si3N4 Matrix on Microstructure and Properties of Laminated Si3N4/BN Ceramics

Abstract

Abstract: The effects of additives to Si₃N₄ matrix layers on microstructure and properties of laminated
Si₃N₄/BN ceramics were studied. Laminated Si₃N₄/BN ceramics with La₂O₃-Y₂O₃-Al₂O₃ (denoted as C), Y₂O₃-Al₂O₃ (denoted as B), MgO-Y₂O₃-Al₂O₃
(denoted as A) added as sintering aids to the Si3N4 matrix layers were prepared and tested separately. The results obtained show that WOF
(work of fracture) of sample C is 3100J/m², which is higher than that of 2100 and 1600J/m^2 of sample A and B. Bending strength of sample C is 610MPa, which is lower than
that of 700 and 620MPa of sample A and B. In sample C, crack deflection and propagation occur, which result in high-energy absorption and high
toughness. And in sample C, elongated β-Si3N4 grains grow very well, which is caused by the addition of La₂O₃.

Key words: laminated ceramics, additives, β-Si₃N₄

CLC Number:

TQ174

LI Cui-Wei,HUANG Yong,WANG Chang-An,ZAN Qing-Feng,ZHAO Shi-Ke. Effects of Additives to Si₃N₄ Matrix on Microstructure and Properties of Laminated Si₃N₄/BN Ceramics[J]. Journal of Inorganic Materials.

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Effects of Additives to Si₃N₄ Matrix on Microstructure and Properties of Laminated Si₃N₄/BN Ceramics

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