Influence of coating thickness on rolling contact fatigue of alumina ceramics thermally sprayed on steel roller
Influence of coating thickness on rolling contact fatigue of alumina ceramics thermally sprayed on steel roller
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DOI：
10.1016/j.triboint.2006.01.013
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发表时间：
2006-11
影响因子：
6.2
通讯作者：
M. Fujii;Jiabin Ma;A. Yoshida;S. Shigemura;K. Tani
中科院分区：
文献类型：
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作者：
M. Fujii;Jiabin Ma;A. Yoshida;S. Shigemura;K. Tani
在两辊试验机上研究了喷涂层厚度对名义成分为Al_2O_3-2.3质量%TiO_2的热喷涂氧化铝陶瓷在纯滚动接触条件下滚动接触疲劳的影响。研究了喷涂镍基合金底层对滚动接触疲劳性能的影响。试验轧辊的陶瓷喷涂层厚度分别为0.2、0.5和1.0 mm。喷涂辊的失效形式为亚表面裂纹引起的剥落。在无底涂层的情况下，0.2 mm厚喷涂层的轧辊滚动接触疲劳强度最小。对0.2 mm厚喷涂层的轧辊进行底涂处理，提高了轧辊的滚动接触疲劳强度。当失效深度小于喷涂层厚度时，底涂层对滚动接触疲劳强度的影响不大。次表面剪应力最大值出现的深度与观测到的剥落裂纹深度基本一致。
The influence of the sprayed layer thickness on rolling contact fatigue of a thermally sprayed alumina ceramics with a nominal composition of Al2O3–2.3 mass% TiO2was investigated using a two-roller test machine under pure rolling contact condition with oil lubricant. The influence of undercoating of sprayed nickel-based alloy on rolling contact fatigue was also investigated. Thicknesses of the ceramics-sprayed layer of tested rollers were 0.2, 0.5 and 1.0mm. The failure mode of sprayed rollers was spalling caused by subsurface cracking. In the case of sprayed rollers without undercoating, rolling contact fatigue strength of rollers with 0.2mm thickness sprayed layer was the smallest. Rolling contact fatigue strength of sprayed roller with 0.2mm thickness sprayed layer was improved by undercoating. In case the failure depth was small as compared with the thickness of sprayed layer, effect of undercoating on the rolling contact fatigue strength was little. The depths where the maximum values of subsurface shear stresses occurred, almost corresponded to the observed depth of spalling cracks.