Development of a Wear-Resistant Self-Fluxing Thermal Spray Coating by Solid Lubricant Incorporation

International Thermal Spray Conference Pub Date : 2023-05-22 DOI:10.31399/asm.cp.itsc2023p0724

B. Preuß, Thomas Lindner, T. Lampke, W. Wietheger

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Abstract

Self-fluxing alloys are an established thermal spray system in case of superimposed tribological and corrosive loads. A dense coating with high bonding strength can be formed by fusing. Such coating system represent the state of the art in valve technology. Diamond-like carbon (DLC) top coatings are used for friction-reduction. As an alternative approach, this study focuses on the possibility of incorporating solid lubricants in self-fluxing alloy coatings. This allows for higher local stress and failure tolerance as well as a reduced process chain. Molybdenum disulfide (MoS2) was studied as solid lubricant in the self-fluxing alloy NiCrBSiFe. In this preliminary study, the optimization of the MoS2 content with up to 10.0 wt% was performed in spark plasma sintered (SPS) bulk materials. The wear behavior under oscillating wear conditions was investigated. Besides the decrease in coefficient of friction (COF), the wear resistance was increased by incorporating MoS2. Furthermore, the distribution of the solid lubricants within the SPS bulk material and the influence of the production route were analyzed.

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含固体润滑剂的耐磨自熔热喷涂涂层的研制

自熔合金是在摩擦和腐蚀载荷叠加作用下建立的热喷涂系统。通过熔焊可以形成具有高结合强度的致密涂层。这种涂层系统代表了阀门技术的最新水平。类金刚石(DLC)涂层用于减少摩擦。作为一种替代方法，本研究的重点是在自熔合金涂层中加入固体润滑剂的可能性。这允许更高的局部应力和故障容忍度，以及减少工艺链。研究了二硫化钼(MoS2)作为NiCrBSiFe自熔合金的固体润滑剂。在本初步研究中，对火花等离子烧结(SPS)块状材料中MoS2的含量进行了优化，达到10.0 wt%。研究了振动磨损条件下的磨损行为。二硫化钼的加入不仅降低了摩擦系数(COF)，还提高了材料的耐磨性。此外，还分析了固体润滑剂在SPS散装物料中的分布以及生产路线的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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International Thermal Spray Conference

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