等离子喷涂ZrO_2热障涂层孔隙结构的研究  

Pores structure in ZrO_2-Ni/Al gradient thermal barrier coatings prepared by plasma-spraying

作　　者：刘保福[1] 詹肇麟[1] 张红松[2] 李莉[1] 

机构地区：[1]昆明理工大学机电工程学院,云南昆明650093 [2]河南工程学院机电工程系,河南郑州450007

出　　处：《金属热处理》2007年第12期96-99,共4页Heat Treatment of Metals

基　　金：国家自然科学基金项目(50671045)

摘　　要：采用等离子喷涂在铝合金基体表面制备ZrO2-Ni／A1梯度热障涂层。利用定量金相分析技术对ZrO2陶瓷层、陶瓷-中间层过渡区和ZrO2＋Ni／Al中间层的孔隙率、孔隙大小和孔隙形态进行了分析。结果表明，各区域的孔隙率、孔隙大小、孔隙形状服从相似的概率分布；陶瓷-中间层过渡区的孔隙率最高（5．97％），ZrO2陶瓷层和ZrO2＋Ni／Al中间层的孔隙率略低；涂层中孔隙尺寸为1～10μm的占72％～80％；孔隙大多呈现等轴状（形状系数Fk〉0．94），其数量约为84％～87％。The ZrO2-Ni/Al gradient thermal-barrier coatings were prepared by plasma-spraying. The quantitative metallurgical analysis was used to identify the porosity, size and shape of the pores in the gradient coating of the ZrO2 ceramiclayer, the trasition zone between ceramic-layer and interlayer, and the ZrO2 ＋ Ni/Al interlayer. The results show that the pores possess the same microstructure characteristics in the ceramic-layer,the interface area and the ZrO2 ＋ Ni/Al interlayer. The cumulative possibilities of the porosities,the pore sizes （equivalent diameter：D） and the pore shapes （coefficient of shape ： Fk） show similar distribution. The greatest porosity appears in the transition zone, being about 5.97%. Most of the pores in the coatings are about 1 - 10μm in equivalent diameter （content ：72% ～ 80% ）, and shows equiaxial shape （ Fk 〉 0. 94, content ：84% ～ 87% ）.

关 键 词：等离子喷涂 梯度热障涂层 孔隙率 孔隙大小 孔隙形态 

分 类 号：TG174.442[金属学及工艺—金属表面处理]