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Processing and Thermal Shock Resistance of a Polymer‐Derived MoSi 2 /SiCO Ceramic Composite
Author(s) -
Bergero Luca,
Sglavo Vincenzo M.,
Soraru Gian Domenico
Publication year - 2005
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.1551-2916.2005.00550.x
Subject(s) - materials science , composite material , ceramic , composite number , thermal shock , ceramic matrix composite , casting , pyrolysis , thermal expansion , elastic modulus , porosity , dispersion (optics) , flexural strength , chemical engineering , physics , optics , engineering
In this paper, we report a study on the thermal shock resistance (TSR) of MoSi 2 /SiCO ceramic composites obtained through controlled pyrolysis of a gel‐derived precursor. MoSi 2 ‐filled gel is prepared by casting a sol obtained from MoSi 2 powder dispersed in methyltriethoxysilane. The pyrolysis product can be described as a porous ceramic composite formed by a SiCO matrix with a dispersion of MoSi 2 particles. Mechanical characterization is performed on bar samples by four‐point bending. The TSR is investigated either by evaluating the R parameter (associated with strength, elastic modulus, and thermal expansion coefficient), or with the conventional water quenching technique. In both cases, the results suggest that the studied ceramic material displays a good TSR, which makes it a candidate for high‐temperature application.