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http://dx.doi.org/10.4191/KCERS.2002.39.11.1069

Effects of Atmosphere during Al Infiltration on Properties of B4C/Al Cermets  

Lim, Kyoung-Ran (Division of Materials Science and Engineering, KIST)
Kang, Deog-Il (Division of Materials Science and Engineering, KIST)
Kim, Chang-Sam (Division of Materials Science and Engineering, KIST)
Publication Information
Journal of the Korean Ceramic Society / v.39, no.11, 2002 , pp. 1069-1073 More about this Journal
Abstract
Properties of $B_4C/Al$ cermets were studied as a function of atmosphere during infiltration and post-heat treatment. The cermet A(infiltrated at $1100{\circ}C$/10 min under vacuum) had 19.4 wt% of Al but the cermet B(infiltratd at $1080{\circ}C$/10 min under a flowing argon) showed 14.4 wt% of Al. It indicated that the reaction between $B_4C$ and Al underwent slower under vacuum than under a flowing argon. The cermet B as infiltrated showed the density of 2.65 $g/cm^3$, the MOR of 503 MPa and the Young's Modulus of 237 GPa, but the post-heat treatment at $900{\circ}C$ for 8h under a flowing Ar gave rise to the cermet with the density of 2.65 $g/cm^3$, the MOR of 296 MPa, the Young's Modulus of 300 GPa. The cermet B showed better properties than the cermet A. Changes in compositions of the cermets by the post-heat treatment were observed qualitatively by XRD and SEM, the amount of Al was determined by analysis of its DSC curve.
Keywords
$B_4C/Al$ cermet; Atmosphere of infiltration; MOR; Young's modulus; Post-heat treatment;
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Times Cited By KSCI : 1  (Citation Analysis)
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