溶胶制备工艺对ZrO_2－Y_2O_3涂层性能的影响

用无机金属盐水解及有机醇盐中间体合成两种不同的工艺路线制备了ＺｒＯ_２－Ｙ_２Ｏ_３复合Ｓｏｌ（溶胶），对比了通过Ｄｉｐ－Ｃｏａｔｉｎｇ的方法在ＧＨ２２０／ＭＣｒＡｌＸ基体上形成致密ＺｒＯ_２－Ｙ_２Ｏ_３陶瓷涂层的能力，以及涂层在１０００℃的静态抗氧化性能．结果表明，金属有机醇盐工艺制备的ＺｒＯ_２－Ｙ_２Ｏ_３陶瓷涂层具有极其优越的高温静态抗氧化性能．无机金属盐水解所制备的ＺｒＯ_２－Ｙ_２Ｏ_３涂层抗氧化能力明显低于金属有机醇盐工艺．可能的原因是残留在涂层内的微量酸根离子使氧化和腐蚀过程加剧．

Effect of Sol-Gel Precursors on Structure and high Temperature Oxidation Resistance of ZrO_2-Y_2O_3 Ceramic Coatings

Both metalorganic and inorganic salt precursors were used for preparation of GH220/ NiCrAlYSiHf/ ZrO_2-Y_2O_3 ceramic coatings. Effect on the structure of the Sol and the high temperature resistance of the resultant ceramic coatings were studied. It was found that although both process can be used for preparation of dense continuous ZrO_2-Y_2O_3 ceramic coatings,only the metalorganic process can give excellent high temperature resistance to the resultant ceramic coatings. Residue acid radicals presented in the Sol may be responsible for the bad performance of the coatings prepared from the inorganic salt process.