Multitoughening of B4C Composite

Abstract

Abstract: B₄C-35vol% TiB₂ composite ceramics with various amounts of free carbon hot-pressed at 2070℃ were studied. The incorporation of particulate TiB₂ into B₄C raised the toughness from3.6MPa.m^1/2 to 6.5MPa.m^1/2. A further increase of composite toughness up to 7.6MPa.m^1/2 wasobtAlNed upon the addition of free carbon. SEM and TEM investigation revealed that the improvement of the composite toughness resulted from the multitoughening of both the crack deflectionassociated with the incorporation of TiB₂ particles and the produced microcrack nucleated due to the strong residual stress and weak interface caused by the presence 9of free carbon in the interface and propagated along B₄C－TiB₂interfaces.

Key words: composite ceramics, crack deflection, microcrack, multitoughening

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TANG Jun,TAN Shouhong,CHEN Zhongming,JIANG Dongliang. Multitoughening of B₄C Composite[J]. Journal of Inorganic Materials.

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