The Properties of SiC Matrix composites with Various AlN Contents

摘要

SiC matrix composites can be reinforced and toughened by the second phase of AlN particles. SiC-AlN composites are mixed by ball milling of the SiC and A1N powders, and then hot pressed under 40 MPa at 1950°C in Ar atmosphere. The object of this paper is to understand the effect of A1N contents on the properties of AlN/SiC particulate composites. AlN content is between 5 and 40wt%. For improving to mechanical properties of AlN/SiC composites, the composition range of AlN/SiC composites are between 90SiC-10AlN and 80SiC-AlN20(wt%). Less or more than this ratio would result in a microstructure with much pores or AlN grain-growth, respectively, two phenomena would decrease in the mechanical properties of AlN/SiC composites.