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The Effect of Particle Size Distribution on the Microstructure and the Mechanical Properties of Boron Carbide‐Based Reaction‐Bonded Composites
Author(s) -
Hayun Shmuel,
Weizmann Amir,
Dariel Moshe P.,
Frage Nahum
Publication year - 2009
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2008.02290.x
Subject(s) - materials science , boron carbide , volume fraction , composite material , silicon carbide , microstructure , boron , weibull modulus , dissolution , weibull distribution , precipitation , particle size , particle (ecology) , phase (matter) , flexural strength , chemical engineering , chemistry , statistics , mathematics , organic chemistry , oceanography , meteorology , engineering , geology , physics
The presence of unreacted, free silicon lowers the mechanical properties of reaction‐bonded boron carbide. The fraction of free silicon can be reduced by increasing the green density of the initial boron carbide performs. The use of multimodal boron carbide mixtures allows attaining 75% green density. After reaction bonding with molten silicon, the composites consist of four phases, namely the original B 4 C particles, the B 12 (B,C,Si) 3 phase, product of the dissolution–precipitation process, β‐SiC, and residual Si. The volume fraction of residual Si in the composites is in the 8–10% range. The infiltrated composites display elevated values of the mechanical properties with a high Weibull modulus.