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Properties of Silicon Nitride–Molybdenum Disilicide Particulate Ceramic Composites
Author(s) -
Kao Mingyuan
Publication year - 1993
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.1151-2916.1993.tb04030.x
Subject(s) - materials science , molybdenum disilicide , composite material , ceramic , composite number , fracture toughness , molybdenum , silicon nitride , electrical resistivity and conductivity , nitride , metallurgy , layer (electronics) , electrical engineering , engineering
The physical and mechanical properties of hot‐pressed Si 3 N 4 –MoSi 2 particulate composites containing 15 and 30 vol% MoSi 2 were studied. The average room‐temperature four‐point bend strength, fracture toughness, and electrical resistivity are 522 MPa, 3.6 MPa·√m, and 6.3 × 10 5 Χ·cm for the 15 vol% MoSi 2 composite, and 487 MPa, 5.3 MPa·√m, and 0.31 Ω·cm for the 30 vol% MoSi 2 composite. The mechanical properties of the composites are very close to those of hot‐pressed Si 3 N 4 ceramics. The high electrical conductivity of the 30 vol% MoSi 2 composite was attributed to the percolation effect of MoSi 2 particles. Parabolic oxidation behaviors were observed for the 30 vol% MoSi 2 composite during the 1200°C long‐term oxidation experiments.