溶胶-凝胶法制备Al_2O_3/ZrO_2涂层及对γ-TiAl合金高温氧化行为的影响

稀有金属材料与工程, 2010, 39(2): 367-371.

溶胶-凝胶法制备Al_2O_3/ZrO_2涂层及对γ-TiAl合金高温氧化行为的影响

张学军 ^1, , 高春香 ^2, , 王蕾 ^3, , 李琪 ^4, , 王淑菊 ^5, , 张英 ^6,

1.沈阳化工学院,辽宁沈阳110142

2.沈阳化工学院,辽宁沈阳110142

3.沈阳化工学院,辽宁沈阳110142

4.沈阳化工学院,辽宁沈阳110142

5.沈阳化工学院,辽宁沈阳110142

6.沈阳化工学院,辽宁沈阳110142

基金项目: 沈阳化工学院博士科研启动基金(200603206) 辽宁省高等学校科学研究项目(05L 342)

关键词：溶胶-凝胶法 , Al_2O_3/ZrO_2涂层 , γ-TiAl合金 , 高温氧化行为

Preparation of Al_2O_3/ZrO_2 Coating by Sol-Gel Method and Its Effect on High-Temperature Oxidation Behavior of γ-TiAl Based Alloys

Zhang Xuejun ^1, , Gao Chunxiang ^2, , Wang Lei ^3, , Li Qi ^4, , Wang Shuju ^5, , Zhang Ying ^6,

1.沈阳化工学院,辽宁沈阳110142

2.沈阳化工学院,辽宁沈阳110142

3.沈阳化工学院,辽宁沈阳110142

4.沈阳化工学院,辽宁沈阳110142

5.沈阳化工学院,辽宁沈阳110142

6.沈阳化工学院,辽宁沈阳110142

Keywords： sol-gel method , Al_2O_3/ZrO_2 coating , γ-TiAl based alloy , high temperature oxidation

以异丙醇铝(Al(OC_3H_7)_3)和氧氯化锆(ZrOCl_2·8H_2O)为原料,采用溶胶-凝胶法在γ-TiAl 基合金表面制备Al_2O_3/ZrO_2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:Al_2O_3/ZrO_2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.

Al_2O_3/ZrO_2 coating was deposited on γ-TiAl based alloys with aluminum isopropoxide (A1(OC_3 H_7)_3) and zirconium oxychloride octahydrate (ZrOCl_2·8H_2O) 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.

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