Ti40/NiCrAl阻燃涂层抗氧化性能研究

Study on Oxidation Resistance of Ti40/NiCrAl Burn Resistant Coating

摘要:

采用等离子喷涂工艺在Ti40基体表面制备厚0.2~0.4 mm的阻燃涂层，并利用光学和扫描电子显微镜对钛合金基体和阻燃涂层的显微结构、截面形貌进行表征，开展了钛合金和阻燃涂层在600 ℃下的抗氧化性能试验研究。结果表明：涂覆阻燃涂层的钛合金试样在600 ℃静态空气中连续氧化100 h后，其氧化增重减少76%以上，氧化速率降低92%，抗高温氧化性能提高12倍；同时，SEM 观察结果显示高温氧化后阻燃涂层仍保持完好，说明该涂层与试样的结合性能以及涂层的抗氧化性能较好，适应于航空发动机防钛火阻燃涂层

Abstract:

The burn resistant coating with the thickness of 0.2~0.4 mm was prepared on Ti40 titanium substrates by plasma spraying. The microstructure and the cross section morphology of the Ti-based alloys and the burn resistant coating were characterized by OM and SEM. The oxidation resistance properties of substrates and burn resistant coating at 600 °C were studied. Results show that the Ti-based alloys with burn resistant coating were oxidized continuously in 600 °C static air for 100 h, and afterwards that the mass gain is decreased by 76% and the oxidation rate is decreased by 92% with contrast to the no-coating Ti-based alloys. It is shown that the oxidation resistance is improved by 12 times. In addition, the burn resistant coating is fully perfect after oxidation test, so it is concluded that the burn resistant coating can provide excellent oxidation resistance and be applied to the titanium fire resistance for titanium alloy parts in aero-engine