Mechanical Behavior, Microstructure and Phase Composition of Free Sintered Al2O3-B4C Whisker Composites

Abstract

B4C whisker, Al2O3 matrix composites have been successfully densified at 1800°C by pressureless sintering. Small additions of B4C proved to be a sintering aid to the densification via mechanisms other than being a grain growth inhibitor. A minor interfacial chemical reaction was detected from X-ray diffraction analysis. An increased fracture toughness and hardness were realized in the composites with 5 approx. 20 vol% whiskers. The maximum fracture toughness and Vicker's hardness reached were 6.24 MPa.m 1/2 and 1776 Kg/mm2. However, an improvement in the flexural strength was not observed, which resulted from the coarse whisker and grain sizes.

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

0196-6219

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 The Authors, All rights reserved.

Publication Date

01 Dec 1996

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