Premium
Preparation and Properties of Machinable Si 2 N 2 O/BN Composites
Author(s) -
Tong Qingfeng,
Zhou Yanchun,
Zhang Jie,
Wang Jingyang,
Li Meisuan,
Li Zhongping
Publication year - 2008
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.1744-7402.2008.02197.x
Subject(s) - materials science , machinability , composite material , thermal shock , flexural strength , dielectric , composite number , microstructure , modulus , elastic modulus , machining , metallurgy , optoelectronics
Si 2 N 2 O/BN composites were successfully fabricated. With increasing BN content, the elastic modulus and hardness almost linearly decrease while the flexural strength does not exhibit a dramatic degradation. This is attributed to the fact that the homogeneously dispersed nanosized BN particles inhibit the grain growth of Si 2 N 2 O. The critical thermal‐shock resistance temperature of the Si 2 N 2 O/30 vol% BN composite is enhanced by 400°C than monolithic Si 2 N 2 O. The introduction of BN significantly improves the dielectric properties and machinability. The Si 2 N 2 O/BN composites show a combination of high strength, low dielectric constant, good thermal shock resistance, and machinability, indicating that they are promising structural/functional materials.