原位增韌β-Si<sub>3</sub>N<sub>4</sub>/α-Sialon復相陶瓷

原位增韌β-Si₃N₄/α-Sialon復相陶瓷

摘要: 通過XRD,SEM和力學性能測試研究了β-Si₃N₄/α-Sialon復相陶瓷熱壓燒結的致密化、相組成、力學性能和微觀結構.結果表明,β-Si₃N₄/α-Sialon復相陶瓷綜合了β-Si₃N₄和α-Sia-lon的力學性能,可通過改變起始粉末的組成,可以調整相組成及裁剪材料的力學性能.由于加人具有大的長徑比的物相β-Si₃N₄,提高了材料的強度和韌性.

Abstract: The densification behavior, phase composition, mechanical properties and microstructure of hot-pressed multi-phase β-Si₃N₄/α-Sialon ceramics were studied by XRD, mechanical measurements andSEM. The results indicated that the multi-phase β-Si₃N₄/α-Sialon ceramics mix the mechanical properties ofβ-Si₃N₄ and α-Sialon, the phase composition and mechanical properties can be tailored by adjusting the composition of start powders. Compared with a-Sialon ceramics, the strength and toughness of the multi-phase β-Si₃N₄/α-Sialon ceramics are increased by in-situ toughness because of adding the β-Si₃N₄ phase with a highaspect ratio.