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Hot‐Pressed MoSi 2 ‐Particulate‐Reinforced α‐SiAlON Composites
Author(s) -
Nordberg Lars O.,
Ekström Thommy
Publication year - 1995
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.1151-2916.1995.tb08249.x
Subject(s) - sialon , materials science , hot pressing , ceramic , composite material , coalescence (physics) , microstructure , particulates , toughness , ceramic matrix composite , fracture toughness , chemistry , physics , astrobiology , organic chemistry
MoSi 2 ‐particulate‐reinforced α‐SiAlON ceramic composites containing 10, 20, 25, and 30 vol% were prepared by hot pressing at 1750°‐1800°C. The α‐SiAlON matrix was of the composition (Y 0.48 Si 10.00 A1 2.30 O 1.17 N 15.29 ). The hardness for the fully dense samples changed from HV10 = 22.5 to 15.3 GPa and the toughness from 3.2 to around 5.2 MPa . m 1/2 when up to 30 vol% MoSi 2 was present. Two interesting microstructural features have been found. First, with an increasing amount of MoSi 2 a pronounced coalescence of MoSi 2 particles formed a “dual phase” material. The second effect was the growth of elongated α‐SiAlON grains in the matrix with 10 vol% MoSi 2 added. The oxidation resistance has been determined to be unaffected by the addition of 2hd vol % MoSi 2 at 1250°C in oxygen gas of l atm pressure.