为提高炭/炭(C/C)复合材料的高温抗氧化性,采用包埋–刷涂法在其表面制备SiC/ZrSiO4?SiO2(SZS)复合涂层.研究SZS复合涂层包覆C/C复合材料在1500℃下不同氧分压测试环境下的抗氧化性能以及1500℃至沸水(100℃)的热循环性能.结果表明:SZS复合涂层试样具有优异的高温抗氧化性能和热震性能.在1500℃等温高氧分压环境下(空气流量36 L/h)氧化50 h后试样仅轻微失重(约0.03%),而在1500℃低氧分压(静态空气)中氧化111 h后仍然增重0.54%.此外,SZS复合涂层试样在高氧分压下氧化50 h及低氧分压下氧化80 h后,其残余压缩强度分别为70%和72.5%.SZS复合涂层试样在经历30次热循环以后,其质量损失率仅为1.61%,残余压缩强度约为74%.SZS涂层表现出良好的抗氧化性能和抗热震性能,可在高温下为C/C复合材料提供长期的保护.
A SiC/ZrSiO4?SiO2(SZS) coating was successfully fabricated on the carbon/carbon (C/C) composites by pack cementation, slurry painting and sintering to improve the anti-oxidation property and thermal shock resistance. The anti-oxidation properties under different oxygen partial pressures (OPP) and thermal shock resistance of the SZS coating were investigated. The results show that the SZS coated sample under low OPP, corresponding to the ambient air, during isothermal oxidation was 0.54% in mass gain after 111 h oxidation at 1500 ℃ and less than 0.03% in mass loss after 50 h oxidation in high OPP, corresponding to the air flow rate of 36 L/h. Additionally, the residual compressive strengths (RCS) of the SZS coated samples after oxidation for 50 h in high OPP and 80 h in low OPP remain about 70% and 72.5% of those of original C/C samples, respectively. Moreover, the mass loss of SZS coated samples subjected to the thermal cycle from 1500 ℃ in high OPP to boiling water for 30 times was merely 1.61%.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%