高温固相法制备Sm2O3掺杂La2Ce2O7热障涂层材料

以La2 O3、CeO2和Sm2 O3为原料,采用高温固相反应法制备了Sm2 O3部分掺杂La2 Ce2 O7热障涂层陶瓷材料,其化学式为(SmxLa1-x)2Ce2O7.采用X射线衍射法研究了试样的物相结构,并通过对比各实验条件下制备的试样的X射线衍射图谱,对试样的掺杂比例、烧制温度及烧制时间进行了探究.结果表明,所制备试样为萤石结构,当掺杂摩尔比Sm：La为1：2或1：3时试样均能保持良好的相结构,以掺杂摩尔比Sm：La=1：2制备的( Sm0.33 La0.67)2 Ce2 O7材料在1600℃下具有良好的相稳定性,且其最佳制备条件为1550℃下烧制10 h,该材料是一种很有潜力的新型热障涂层陶瓷材料.

Preparation of Sm2 O3 doped La2 Ce2 O7 ceramics for thermal barrier coatings by high temperature solid-state reaction

Sm2 O3 partly doped La2 Ce2 O7 ceramic materials for thermal barrier coatings were prepared by high temperature solid-state reaction using La2O3, CeO2 and Sm2O3 as raw materials. Their chemical formula is (SmxLa1-x)2Ce2O7. The phase composition of the samples was studied by X-ray diffraction ( XRD) . The doping ratio, firing temperature and firing time were investigated by an XRD pattern contrast analysis of the samples made in different conditions. It is found that the sample with fluorite structure has been prepared, and it can maintain its phase structure when the doping molar ratio Sm:La is 1:2 or 1:3. As the doping molar ratio Sm:La is 1:2 at the firing temperature of 1550℃ for 10 h, the prepared ( Sm0. 33 La0. 67 ) 2 Ce2 O7 has a good phase stability at 1600℃. This material can be potentially used as a new material for ceramic thermal barrier coatings.