转移等离子弧熔敷<bold>TiC-MoSi<sub>2</sub> </bold>增强复合涂层显微组织及抗氧化性

doi:10.12442/j.issn.1002-185X.20200446

首页 > 过刊浏览>2021年第50卷第8期 >2686-2693. DOI:10.12442/j.issn.1002-185X.20200446

转移等离子弧熔敷TiC-MoSi2 增强复合涂层显微组织及抗氧化性
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                        10.12442/j.issn.1002-185X.20200446
                    
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作者单位:1.北京交通大学 机械与电子控制工程学院 材料科学与工程研究中心，北京 100044;2.河南科技大学 高端轴承摩擦学技术与应用国家地方联合工程实验室，河南 洛阳 471003
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基金项目:The Open Fund of National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology (201904) and the Fundamental Research Funds for the Central Universities (2019JBZ106)

Microstructure and Oxidation Performance of TiC-MoSi₂ Reinforced Composite Coating Prepared by Plasma Tran-sferred Arc Cladding

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1.Materials Science and Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;2.National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science & Technology, Luoyang 471003, China

Fund Project:

Open Fund of National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology (201904); Fundamental Research Funds for the Central Universities (2019JBZ106)

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摘要:

为了提高AISI 304不锈钢的高温抗氧化性及耐磨性，利用转移等离子弧熔敷技术在AISI 304基材表面制备了TiC-MoSi₂复合相增强复合涂层。对比分析了氧化前后复合涂层的显微组织，测试了复合涂层的显微硬度分布，测试并拟合了复合涂层的氧化动力学曲线，探讨了复合涂层的氧化机理。结果表明：复合涂层典型显微组织由TiC-MoSi₂复合相、初生TiC枝晶和γ-(Ni,Fe)/NiSi₂共晶构成，TiC-MoSi₂复合相和初生TiC枝晶作为复合涂层的增强相均匀分布在γ-(Ni,Fe)/NiSi₂共晶基体上。由于TiC-MoSi₂复合相的增强作用以及超细γ-(Ni,Fe)/NiSi₂共晶基体的粘结和支撑作用，复合涂层具有高且均匀的硬度分布、良好的强度和韧性。得益于独特的显微组织，复合涂层表现出良好的高温抗氧化性。

Abstract:

In order to improve the oxidation resistance and wear properties of AISI 304, a TiC-MoSi₂ complex phase enhanced composite coating was designed and in-situ prepared on AISI 304 substrate by plasma transferred arc (PTA) cladding technique. Microstructure of the composite coating before and after oxidation was analyzed. The hardness distribution of the coating was tested. The oxidation kinetics curves of the coating were measured and fitted. The oxidation mechanism of the coating was discussed. Results show that typical microstructure of the composite coating consists of TiC-MoSi₂ complex phases, primary TiC dendrites and γ-(Ni, Fe)/NiSi₂ eutectics. The TiC-MoSi₂ complex phases and TiC dendrites as reinforcing phases are uniformly distributed on the γ-(Ni, Fe)/NiSi₂ eutectic matrix. Due to the strengthening effect of the TiC-MoSi₂ complex phases and the binding and supporting action of the ultrafine γ-(Ni,Fe)/NiSi₂ eutectic matrix, the composite coating exhibits high and uniform hardness distribution, good strength and toughness. Thanks to its unique microstructure, the composite coating shows good oxidation resistance.

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石晨晓,刘元富,张乐乐,陈德强,张政,刘志宏.转移等离子弧熔敷TiC-MoSi₂ 增强复合涂层显微组织及抗氧化性[J].稀有金属材料与工程,2021,50(8):2686~2693.[Shi Chenxiao, Liu Yuanfu, Zhang Lele, Chen Deqiang, Zhang Zheng, Liu Zhihong. Microstructure and Oxidation Performance of TiC-MoSi₂ Reinforced Composite Coating Prepared by Plasma Tran-sferred Arc Cladding[J]. Rare Metal Materials and Engineering,2021,50(8):2686~2693.]
DOI：10.12442/j. issn.1002-185X.20200446

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收稿日期:2020-06-24
最后修改日期:2020-09-15
录用日期:2020-09-15
在线发布日期: 2021-09-07
出版日期: 2021-08-31

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