Preparation and characterization of high temperature SiCN/ZrB2 ceramic composite

作者：Sun Yong; Li Yali^*; Su Dong; Wang Sihui; Xu Yao

来源：Ceramics International, 2015, 41(3): 3947-3951.

DOI：10.1016/j.ceramint.2014.11.078

• High-temperature stability
• Polyvinylsilazane
• SiCN
• ZrB2

The SiCN/ZrB2 ceramic composite was prepared from a liquid polyvinylsilazane with addition of ZrB2 powders, subsequently crosslinked at 300 degrees C and pyrolysed at 1000 degrees C in flowing Ar. Scanning electron microscopy (SEM) and X-ray diffractometry (XRD) showed that SiCN/ZrB2 consists of dense amorphous SiCN matrix with dispersed micron ZrB2 crystals. Thermal gravimetric analysis (TGA) showed SiCN/ZrB2 was stable up to 1550 degrees C in Ar with 5.4% weight loss, 6.4% lower than the pure SiCN ceramic. Heat treatment from 1100 degrees C to 1500 degrees C was performed to initiate crystallization. XRD showed thata SiCN matrix of SiCN/ZrB2 remained amorphous up to 1400 degrees C in Ar and indicated new crystals formed such as ZrO2 at 1100 degrees C, ZrC/ZrN at 1200 degrees C and Zr2CN at 1500 degrees C, which account for the improved high-temperature stability of the material.

• 出版日期2015-4
• 单位天津大学