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首页> 外文期刊>CERAMICS INTERNATIONAL >Microstructures and properties of in-situ TiC particles reinforced Ni-based composite coatings prepared by plasma spray welding
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Microstructures and properties of in-situ TiC particles reinforced Ni-based composite coatings prepared by plasma spray welding

机译：等离子喷涂焊接原位TiC颗粒增强Ni基复合涂层的组织与性能

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摘要

In this investigation, the in-situ TiC particles reinforced Ni-based composite coatings were produced by plasma spray welding with mixed powders (NiCrBSi+Ti+NiCr-Cr3C2). Their microstructures and properties were studied. The experimental results showed that the composite coatings consisted mainly of gamma-Ni, Cr23C6, Cr7C3, Ni3Si, Cr5B3, CrB, FeNi3 and TiC phases. TiC particles were in-situ synthesized during plasma spray welding. The content of TiC particles and chromium carbides in the coatings increased with the mass fractions of Ti and NiCr-Cr3C2 powders increasing in the mixed powders, which resulted in enhancing the composite coatings hardness. The composite coating prepared with the mixed powder (70 wt%NiCrBSH-30 wt% (Ti+NiCr-Cr3C2)) showed a higher hardness 1142 HV0.5. The wear resistance of the composite coatings were greatly improved due to the presence of in-situ TiC particles in comparison with the substrate. When the mixed powder (75 wt% NiCrBSi+25 wt% (Ti+NiCr-Cr3C2)) was used, the composite coating had better wear resistance, and the coating wear volume loss after wear tests was 6 mm(3), which was only 5% of that for the low carbon steel substrate (125 mm(3)). (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
机译：在这项研究中，通过等离子喷涂混合粉末（NiCrBSi + Ti + NiCr-Cr3C2）制备了原位TiC颗粒增强的Ni基复合涂层。研究了它们的微观结构和性能。实验结果表明，复合涂层主要由γ-Ni，Cr23C6，Cr7C3，Ni3Si，Cr5B3，CrB，FeNi3和TiC相组成。在等离子喷涂过程中原位合成TiC颗粒。随着混合粉末中Ti和NiCr-Cr3C2粉末质量分数的增加，涂层中TiC颗粒和碳化铬的含量增加，从而提高了复合涂层的硬度。用混合粉末（70 wt％NiCrBSH-30 wt％（Ti + NiCr-Cr3C2））制备的复合涂层显示出更高的硬度1142 HV0.5。与基体相比，由于存在原位TiC颗粒，复合涂层的耐磨性得到了极大的改善。当使用混合粉末（75 wt％NiCrBSi + 25 wt％（Ti + NiCr-Cr3C2））时，复合涂层具有更好的耐磨性，磨损试验后的涂层磨损量损失为6 mm（3），低碳钢基材（125 mm（3））的仅为5％。 （C）2015 Elsevier Ltd和Techna Group S.r.l.版权所有。

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