Joining of SiC ceramics via a novel liquid preceramic polymer (V-PMS)

摘要

A novel liquid preceramic polymer (V-PMS) was synthsized by modifying polymethylsilane (PMS) with 1,3,5,7-tetramethy1-1,3,5, 7-tetravinylcyclotetrasiloxane ([CH3(CH2=CH)SiO](4), D4Vi), for joining SiC ceramics under ambient pressure. The obtained V-PMS with a viscosity of 125 Pas at room temperature exhibits excellent thermal properties and bonding strength. The ceramic yield of V-PMS treated at 1200 degrees C under Ar atmosphere is 84.5%, which is 38.3% higher than the original PMS. The shear strengths of the SiC joints joined by V-PMS at 800 degrees C, 1000 degrees C and 1200 degrees C under N-2 atmosphere are 11.9 MPa, 34.5 MPa and 29.9 MPa, respectively. The excellent performances make the obtained V-PMS promising candidates for joining SiC ceramics in high-temperature applications. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.