To improve the hydrothermal corrosion resistance of SiC_f/SiC composites, SiC coatings were chemical vapor deposited at 1000, 1150 and 1200 °C. Their corrosion behaviors were investigated using immersion tests and various analytical methods. The intergranular corrosion phenomenon was observed at all three coatings. It caused the delamination on the surface of 1000 and 1150 °C coatings, whereas only the local fall-off of large grains occurred on the 1200 °C coating. The large grain size and high crystallinity of coating deposited at 1200 °C contributed to the excellent corrosion resistance compared with coatings deposited at other two temperatures.

为了提高SiC _f / SiC复合材料的耐水热腐蚀性能，在1000、1150和1200°C的温度下化学气相沉积SiC涂层。使用浸没测试和各种分析方法研究了它们的腐蚀行为。在所有三个涂层上均观察到晶间腐蚀现象。它在1000和1150°C的涂层上引起分层，而在1200°C的涂层上仅出现大晶粒的局部脱落。与在其他两个温度下沉积的涂层相比，在1200°C沉积的涂层具有较大的晶粒尺寸和较高的结晶度，因此具有出色的耐腐蚀性。