Si3N4/BN(f)复合材料的相界面

无机材料学报, 1998, 13(1): 109-112.

Si₃N₄/BN_(f)复合材料的相界面

许钫钫 , 宋澄宇 , 温树林 , 马利泰

中国科学院上海硅酸盐研究所

上海 200050

Shanghai Institute of Ceramics

关键词： BN纤维 , composite , interfaces , microstructure

Interfaces in Si₃N₄/BN_(f) Composite

XU Fang-Fang , SONG Cheng-Yu , WEN Shu-Lin , MA Li-Tai

Keywords： BN fibers , 复合材料 , 相界面 , 显微结构

本文借助高分辨电子显微镜研究了Si₃N₄／BN（f）复合材料的相界面,研究发现，BN纤维的两端与基体结合牢固，界面不易解离，材料断裂过程中纤维很难拔出．材料的韧性主要通过BN纤维自身（001）面上的滑移、撕裂和弯曲以及BN纤维的侧表面与Si₃N₄颗粒的界面上的解离等途径得以提高．

Interfaces in Si₃N₄ /BN_(f) composite were studied by using high resolution electron microscope (HREM). It was revealed that fibers ends, botll tops and bases, were closely bonded with the matrix grains. Fiber pull-out had hardly any contribution to the improvement in fracture toughness of the composite material. HREM observations suggested that the increased fracture energy absorbed came mainly from sliding, tearing and curving Oil (001) plane of BN fibers and debonding at the interfaces between Si₃N₄ and side surfaces of BN fibers.

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