【摘要】 研究了等离子喷涂特征参数(CPSP)对Al2O3-13wt%TiO2纳米涂层相组成、微观组织和性能的影响。结果表明,纳米涂层含有α-Al2O3、γ-Al2O3和金红石结构TiO2,其微观组织由全熔柱状晶区域和纳米结构的部分熔化区域组成。部分熔化区形貌与CPSP有关,低CPSP时主要为球状和部分条状,高CPSP条件下基本上都是不规则条状或块状。随CPSP增加,纳米涂层的结构缺陷减少,致密度提高。不同CPSP获得的纳米涂层的显微硬度和韧性均高于传统涂层,但CPSP过低或过高时,涂层中结构缺陷或结晶相较多,导致硬度和韧性降低。纳米涂层的耐磨性也随CPSP的变化而改变,并与涂层的组织、硬度和韧性的变化相对应。更多还原

【Abstract】 The influence of critical plasma spray parameter（CPSP） on phase,microstructure and properties of nanostructured Al₂O₃-13wt%TiO₂ coating was investigated by means of XRD,SEM and other methods.It is shown that the nanostructured coating contains α-Al₂O₃,γ-Al₂O₃ and rutile TiO₂ phases,and has a microstructure consisting of fully melted columnar crystal region and partially melted nanostructured region.The morphology of the partially melted region is directly related to CPSP used: most being spherical or lamellar for low CPSP and abnormally massive or strip-liked for higher CPSP.With the increase of CPSP,the structural defects in the nanostructured coating decrease and its density increases.The microhardness and toughness of the nanostructured coating deposited at different CPSP are superior to those of the conventional coating.Under too low or too high CPSP conditions,however,more structural defects or solidified phase appear in the nanostructured coating,resulting in the deterioration of microhardness and toughness.The wear property of the nanostructured coating varies also with the change of CPSP,which is eventually associated to the variation of the structure,microhardness and toughness of the nanostructured coating.更多还原