Effects of critical plasma spray parameter and spray distance on wear resistance of Al2O3–8 wt.%TiO2 coatings plasma-sprayed with nanopowders
Effects of critical plasma spray parameter and spray distance on wear resistance of Al2O3–8 wt.%TiO2 coatings plasma-sprayed with nanopowders
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DOI：
10.1016/j.surfcoat.2008.01.002
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发表时间：
2008-04
影响因子：
5.4
通讯作者：
Eunjoo Song;J. Ahn;Sunghak Lee;N. Kim
中科院分区：
文献类型：
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作者：
Eunjoo Song;J. Ahn;Sunghak Lee;N. Kim
等离子喷涂工艺条件对纳米Al 2 O3 -8 wt.%耐磨性的影响研究了等离子喷涂纳米TiO 2涂层。通过改变临界等离子喷涂参数（CPSP）和喷涂距离，在低碳钢基体上制备了5种纳米结构涂层。涂层由γ-Al 2 O3完全熔化区和部分熔化区组成，部分熔化区和气孔的比例随CPSP的增大或喷涂距离的减小而减小。硬度和耐磨性测试结果表明，涂层的硬度随CPSP的增加或喷涂距离的减小而增加，硬度的增加通常导致耐磨性的增加，但在低CPSP的涂层中，硬度和耐磨性并不相关。涂层的主要磨损机制为分层磨损，但低摩擦磨损点涂层的磨损机制也表现为磨粒磨损。根据这些磨损机制，可以解释在低CPSP制备的涂层的耐磨性的改善，因为由于部分熔融区域的存在而改善的抗断裂性可以补偿硬度降低的有害影响。
Effects of plasma spraying conditions on wear resistance of nanostructured Al2O3–8 wt.%TiO2coatings plasma-sprayed with nanopowders were investigated in this study. Five kinds of nanostructured coatings were plasma-sprayed on a low-carbon steel substrate by varying critical plasma spray parameter (CPSP) and spray distance. The coatings consisted of fully melted region of γ-Al2O3and partially melted region, and the fraction of the partially melted regions and pores decreased with increasing CPSP or decreasing spray distance. The hardness and wear test results revealed that the hardness of the coatings increased with increasing CPSP or decreasing spray distance, and that the hardness increase generally led to the increase in wear resistance, although the hardness and wear resistance were not correlated in the coating fabricated with the low CPSP. The main wear mechanism was a delamination one in the coatings, but an abrasive wear mode also appeared in the coating fabricated with the low CPSP. According to these wear mechanisms, the improvement of wear resistance in the coating fabricated with the low CPSP could be explained because the improved resistance to fracture due to the presence of partially melted regions might compensate a deleterious effect of the hardness decrease.