Effect of Grinding Time on the Structure and Wear Resistance of SiC-Аl2O3 Ceramics

 
V. A.Dovgal,
  
I.Timofeeva,
   

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2013, #03/04
http://www.materials.kiev.ua/article/842

Abstract

The effect of grinding time of SiC-50% Аl2O3 mixture in steel drums on the particle size and phase constitution is studied. The optimum hot-pressing temperature up to complete shrinkage is determined depending on the grinding time. The constitution and structure of the hot-pressed ceramics and their influence on the wear-resistance of composites in friction against a steel counterface are analyzed. The wear resistance of the ceramic materials mono-tonically 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 at a grinding time of 32 h. The friction surfaces of SіС-Аl2O3 ceramics are examined, and their wear mechanisms are established.


CERAMIC MATERIAL, IRON MILLING, SILICON CARBIDE, WEAR MECHANISM, WEAR RESISTANCE