SiC_((w))/SiC optic structure composite prepared by RB technology

To manufacture a kind of high fracture toughness SiC(w)/SiC composite optomechanical component material (SiC ceramics reinforced by SiC whisker) with suitable mechanics property and thermal property to the SiC mirror material prepared by reaction bonded (RB) method is presented in this article. The manufacture method of SiC(w)/SiC composite material was RB technique. The main mechanics property and thermal property of the SiC(w)/SiC CMC was tested. The results indicate that the SiC(w)/SiC composite materials has perfect synthesis properties. The bending strength is 243 MPa. The fracture toughness increased from 4.49MPa.m1/2 to 6.43MPa.m1/2, which increase 43.2%. The thermal conductivity of SiC(w)/SiC CMC is 125.3W/m·K,and it is consistent with the thermal conductivity of the RB-SiC mirror material which is 119.3 W/m·K.. Preliminary discussion consider that the SiC whisker pull-out,bridging phenomena and the new SiC grain with nanometer size are the main toughening mechanism of this kind of composite material.