Fabrication and properties of SiC porous ceramics using a polyurethane preparation process |
| |
Authors: | Bo Zhang Haiming Huang Xueling Lu Xiaoliang Xu Jun Yao |
| |
Affiliation: | 1. Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China;2. Beijing Institute of Electronic System Engineering, Beijing 100854, China;3. Beijing Institute of Near Space Vehicle''s System Engineering, Beijing 100076, China |
| |
Abstract: | SiC porous ceramics can be prepared by introducing the polyurethane preparation method into the production process of ceramic biscuits, followed by sintering at 1300?°C for 2?h under N2 flux after the cross-linking of polycarbosilane at 220?°C for 4?h in air. The microstructures, mechanical properties and infiltrations of the SiC porous ceramics are investigated in detail. The best dispersal effect comes from the SiC slurry with xylene as the solvent and a mixture of Silok®7096 (1?wt%) and Anjeka®6041 (4?wt%) as the dispersant. The compressive strength of SiC porous ceramics with high porosity (69.53%) reaches 16.9?MPa. The heat treatment can increase infiltration, the rate of which (4.296?×?10?7 mm2) after the heat treatment at 750?°C in air is approximately two times faster than that before the heat treatment. The SiC porous ceramics fabricated in this study will have potential application in active thermal protection systems. |
| |
Keywords: | Porous ceramics Polyurethane preparation Mechanical properties Infiltration |
本文献已被 ScienceDirect 等数据库收录! |
|