Effect of grinding time on the structure and wear resistance of SiC-[Al.sub.2][O.sub.3] ceramics

The effect of time during which SiC-50% [Al.sub.2][O.sub.3] is ground in steel drums on the particle size and phase composition is studied. The optimum hot-pressing temperature leading to complete shrinkage is determined in relation to grinding time. The composition and structure of the hot-pressed...

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Bibliographic Details
Published in:Powder metallurgy and metal ceramics 2013-07, Vol.52 (3-4), p.189
Main Authors: Umanskii, A.P, Dovgal, A.G, Subbotin, V.I, Timofeeva, I.I, Mosina, T.V, Polyarus, E.N
Format: Article
Language:English
Subjects:
Ceramic materials
Ceramics
Silicon carbide
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Summary:The effect of time during which SiC-50% [Al.sub.2][O.sub.3] is ground in steel drums on the particle size and phase composition is studied. The optimum hot-pressing temperature leading to complete shrinkage is determined in relation to grinding time. The composition and structure of the hot-pressed ceramics and their influence on the wear resistance in friction against a steel counterface are analyzed. The wear resistance of the ceramics monotonically decreases from 23.4 to 3.8 µm/km when grinding time increases from 1 to 16 h and increases to 5.8 µm/km for a grinding time of 32 h. The friction surfaces of SiC-[Al.sub.2][O.sub.3] ceramics are examined, and their wear mechanisms are established. Keywords: ceramics, silicon carbide, iron milling, wear resistance, wear mechanism.
ISSN:1068-1302