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Hot‐Pressing of β‐SiC Powder with Al‐B‐C Additives
Author(s) -
Lin BorWen,
Imai Masamitsu,
Yano Toyohiko,
Iseki Takayoshi
Publication year - 1986
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1986.tb04753.x
Subject(s) - materials science , sintering , hot pressing , microstructure , ceramic , flexural strength , phase (matter) , pressing , liquid phase , composite material , metallurgy , chemistry , thermodynamics , physics , organic chemistry
The sintering behavior of β‐SiC powders with additions of Al, B, and C was studied at 1600° to 1800°C with applied pressures of 20 to 60 MPa. Ceramics with densities of ∼3.08 g/cm 3 were obtained by hot‐pressing at 1650°C and 50 MPa. The bending strength did not degrade up to 1200°C. A large amount of a second phase, which was apparently Al 8 B 4 C 7 , was observed as streaks in the microstructure. It is suggested that a liquid phase, which coexisted with this compound, enhanced densification.