溶胶-凝胶法制备Al2O3/ZrO2涂层及对γ-TiAl

Preparation of Al2O3/ZrO2 Coating by Sol-Gel Method and Its Effect on High-Temperature Oxidation Behavior of γ-TiAl Based Alloys

摘要:

以异丙醇铝(Al(OC3H7)3)和氧氯化锆(ZrOCl2?8H2O)为原料，采用溶胶-凝胶法在γ-TiAl基合金表面制备Al2O3/ZrO2涂层。研究涂层试样和空白试样在1000 ℃静态空气中的长期氧化行为和循环氧化行为。结果表明：Al2O3/ZrO2涂层降低了该合金的氧化速率，提高了合金的抗循环氧化能力。对涂层的作用机制进行了探讨

Abstract:

Al2O3/ZrO2 coating was deposited on γ-TiAl based alloys with aluminum isopropoxide (Al(OC3H7)3) and zirconium oxychloride octahydrate (ZrOCl2?8H2O) as starting materials by sol-gel method. The coating synthesized using dip-coating process, was uniform and crack-free. Isothermal and cyclic oxidations of the coated and uncoated specimens at 1000 ℃ in static air were carried out to test the coating effect on the oxidation behavior of the alloy. The coating decreases the oxidation rate of the alloys and increases the cyclic oxidation resistance. The possible mechanism of the coating on the oxidation behavior of the alloy was discussed