PTFE, an effective additive on the combustion synthesis of silicon nitride

✍ Scribed by Yixiang Chen; Zhiming Lin; Jiangtao Li; Jisheng Du; Shuliang Yang

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 667 KB
• Volume: 28
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/j.jeurceramsoc.2007.06.008

✦ Synopsis

Combustion synthesis (CS) of Si 3 N 4 with the addition of polytetrafluoroethylene (PTFE) was carried out at a relatively low N 2 pressure of 2 MPa. It was found that the additive PTFE promoted the nitridation of Si. The ␣-Si 3 N 4 contents in the periphery of the combustion-synthesized products showed great dependence on the contents of PTFE added in the reactants, which reached 77.7 wt.% with 4 wt.% PTFE addition. The residual silicon in the center of the combustion-synthesized products could be completely nitrided by further heat treatment at 1300 • C for 1 h in N 2 . The temperature difference between the center and the edge of the samples was responsible for the discrepancy in both phase composition and morphology of the products.