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首页> 外文会议>International Thermal Spray Conference Exposition >Shrouded Plasma Sprayed Cr_3C_2-NiCr Coatings - Effect of Shroud-Substrate Distance
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Shrouded Plasma Sprayed Cr_3C_2-NiCr Coatings - Effect of Shroud-Substrate Distance

机译：罩等等离子体喷涂CR_3C_2-NICR涂层 - 护罩 - 基板距离的效果

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摘要

During heat treatment of Cr_3C_2-NiCr thermal spray coatings, regions of carbide dissolution have been observed to precipitate very small carbide grains which grow into finely structured carbide networks. The aim of this project was to investigate the potential of developing tailored submicron carbide composites and composites with unique functionalities related to these carbide networks. The approach taken in this work was to spray a conventional Cr_3C_2-NiCr powder under high power plasma conditions to generate a supersaturated solid solution of Ni-Cr-C from which carbides could be precipitated with heat treatment. Preliminary trials investigated the effect of a broad range of plasma parameters to determine what conditions generated the greatest degree of carbide dissolution with the lowest carbon loss. Follow up trials investigated the most promising parameters in more detail to determine the effect of spray distance on the degree carbide dissolution and carbon loss, with and without shrouding. This paper presents the results of one Ar-H_2 plasma parameter setting from these trials. Gas shrouding had a minimal effect on the degree of carbide dissolution but was effective in reducing air entrainment into the plasma and the degree of decarburisation.
机译：在CR_3C_2-NICR热喷涂涂层的热处理期间，已经观察到碳化物溶解区域沉淀出非常小的碳化物颗粒，该颗粒生长成精细结构的碳化物网络。该项目的目的是调查制定量身定制的亚微米碳化物复合材料和复合材料的潜力，具有与这些碳化物网络相关的独特功能。在该工作中采取的方法是在高功率等离子体条件下喷射常规CR_3C_2-NICR粉末，以产生碳化物可以用热处理沉淀的Ni-Cr-C的过饱和固体溶液。初步试验研究了广泛的等离子体参数的效果，以确定有什么条件产生的最大程度的碳化物溶解与最低碳损失。随访试验更详细地调查了最有前途的参数，以确定喷雾距离对碳化物溶解和碳损失的影响，有和不覆盖。本文介绍了这些试验中的一个AR-H_2等离子体参数设置的结果。气体笼罩对碳化物溶解度的影响最小，但是有效地减少到血浆中的空气夹带和脱碳程度。

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