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Study on surface durability of thermally sprayd WC cermel coating in rolling sliding contact

滚动滑动接触热喷涂WC陶瓷涂层表面耐久性研究

基本信息

批准号：
08650176
负责人：
KANAJIMA Akira
金额：
$ 1.15万
依托单位：
Saga university
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650176/
关键词：
WC cermel coating HVOF Rolling with sliding contact Two-roller tests Tribology Surface durability Wear resistance Substrate hardness WCサ-メット被膜 WCサ-メット溶射皮膜

项目摘要

In the present invesitigation, using a two-roller testing machine, the authors examined the surface durability of thermally sprayd WC-Cr-Ni cermet coating in lubricated rolling or rolling with sliding contact. The coatings of about 40 mum or 90mum thickness were formed by high velocity oxy-fuel flame spraying (HVOR) onto the shot-basted substrata made of a mormalized steel, a thermally refined carbon steel or a carvurized alloy steel then the surfaces after spraying were finished smooth to a mirror-like condition. Mating the WC cermet coated steel roller with the carburized steel roller without coating, the effects of rolling sliding conditions, coating thickness, substrate hardness, etc.were examined. Furthermore, the elastic-plastic behavior of the subsurface layr was analyzed and the effect of subsurface material on the durability of coated roller was descussed. The results obtained are summarized as follows.1.The durability of coated roller varied remarkably depending on the substrate material. Namely, the normalized steel with a hardness of about 200 Hv and the thermally refined steel with a hardness of about 320 Hv showed a shorter life a than the carburized steel with a hardness of about 760 Hv.2.In pure rolling conditions, the coated roller exhibited a fairly high durability. In rolling/sliding conditions, flaking was apt to occur when the coated roller was placed on the slower (driven) side, while flaking was restrained when the coated roller was placed on the faster (driving) side.3.Time to flaking increased as the coating thickness increased ; especially, the effect appeared more distinctly when the substrate hardness lowered.4.From the results of elastic-plastic analysis of the subsurface layr, it was confirmed that such a distinct feature in the occurrence of flaking due to the substrate hardness is attributed to the difference in the plastic deformation of the substrate.

本文用双辊试验机研究了热喷涂WC-Cr-Ni金属陶瓷涂层在润滑滚动和滑动接触滚动中的表面耐久性。约40 μ m或90 μ m厚的涂层通过高速氧-燃料火焰喷涂（HVOR）形成到由正火钢、热精炼碳钢或雕纹合金钢制成的喷丸基底上，然后喷涂后的表面光滑到镜面状条件。将WC金属陶瓷涂层钢轧辊与未涂层的渗碳钢轧辊配对，研究了滚动滑动条件、涂层厚度、基体硬度等因素对配对的影响。此外，还分析了次表层的弹塑性行为，讨论了次表层材料对涂层轧辊耐久性的影响。结果表明：1.不同基材的涂层辊的耐久性差异很大。也就是说，硬度约为200 Hv的正火钢和硬度约为320 Hv的热精炼钢显示出比硬度约为760 Hv的渗碳钢更短的寿命。2.在纯轧制条件下，涂层辊显示出相当高的耐久性。在滚动/滑动条件下，当涂层辊置于低速侧（从动侧）时，易发生剥落，而当涂层辊置于高速侧（主动侧）时，剥落受到抑制。3.剥落时间随涂层厚度的增加而增加;从亚表层的弹塑性分析结果来看，已经证实，由于基材硬度而发生剥落的这种明显特征归因于基材塑性变形的差异。