喷涂角度对等离子喷涂氧化铝钛陶瓷涂层性能影响研究

Influence of Spraying Angle on the Properties of Plasma Sprayed AT13 Ceramic Coatings

采用大气等离子喷涂(APS)系统制备了微米和纳米Al_(2)O_(3)-13%TiO_(2)(AT13)陶瓷涂层,研究了喷涂角度对涂层单道次增加厚度、涂层组织、结合强度和硬度的影响。结果表明:随着喷涂角度的减小,两种涂层单道增厚降低,孔隙率增加,结合强度降低,硬度未发生明显变化。喷涂角度为90°时,微米AT13和纳米AT13陶瓷涂层状态均良好,纳米AT13陶瓷涂层单道增厚较微米AT13高出21.5%。喷涂角度为45°时,纳米AT13陶瓷涂层较微米AT13陶瓷涂层单道增厚高出47%,结合强度高出42.1%。喷涂角度为30°时,微米AT13陶瓷涂层出现了严重的缺陷,纳米AT13陶瓷涂层也出现了较大的孔隙。

Micro-and nano-Al_(2)O_(3)-13%TiO_(2)coatings are sprayed by using the APS system.The influences of the spray angle on the increased thickness of a single pass,coating microstructure,hardness and bonding strength are studied.The results show that with the decrease of the spraying angle,the increased thickness of a single pass and binding strength decrease,that the porosities of the two coatings increase,and that the hardness does not change significantly.When the spray angle is 90°,the two coatings are in good condition,and the increased thickness of a single pass of the nano-Al_(2)O_(3)-13%TiO_(2)coating is 21.5%higher than that of the micro-Al_(2)O_(3)-13%TiO_(2)coating.When the spray angle is 45°,the increased thickness of a single pass and bonding strength of the former are 47%and 42.1%higher than those of the latter.When the spray angle is 30°,the microAl_(2)O_(3)-13%TiO_(2)coating has serious defects,and the nano-Al_(2)O_(3)-13%TiO_(2)coating also has large pores.The hardness of the micro-Al_(2)O_(3)-13%TiO_(2)coating is slightly higher than that of nano-Al_(2)O_(3)-13%TiO_(2).