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激光熔敷Cr2Ni3Si/Cr3Si金属硅化物复合材料涂层组织与高温耐磨性
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TG144

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国家自然科学基金( 50071004);国家高技术研究发展计划课题( 2002AA331030);北京市自然科学基金( 2022012);航空基础科学基金( 02H51011)


Microstructure and High-Temperature Wear Resistance of Laser Clad Cr2Ni3Si/Cr3Si Metal Silicide Composite Coatings on Austenitic Stainless Steel
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    摘要:

    以Cr-Si-Ni高纯预合金化粉末为原料、利用激光熔敷技术在奥氏体不锈钢1Cr18Ni9Ti表面上制得了以金属硅化物Cr3Si为增强相、以复杂多元金属硅化物Cr-Ni-Si为基体的快速凝固金属硅化物复合材料冶金涂层,分析了该涂层的显微组织,在高温滑动磨损条件下测试了其耐磨性能。研究结果表明,Cr3Si金属硅化物的体积分数对激光熔敷Cr2Ni3Si/Cr3Si复合材料涂层的硬度和高温耐磨性有显著影响。由于涂层中硬质耐磨相Cr3Si的抗磨骨干作用,在高温滑动磨损条件下该涂层具有优良的耐磨性能。

    Abstract:

    A rapidly solidified Cr 2 Ni 3 Si /Cr 3 Si metal silicide composite coating was fabricated on an austenitic stainless steel substrate by laser cladding and using Cr-Si-Ni element al powder blend.The laser clad Cr 2 Ni 3 Si /Cr 3 Si metal silicide composite coating has a homogenous mi-crostructure consisting of Cr 3 Si primary dendrites and the interdendritic Cr 2 Ni 3 Si matrix,and is metallurgically bonded to the substrate.The volume fraction of primary Cr 3 Si dendrites has a remarkable influence on hardness and wear resistance o f the laser clad composite coating.T he higher the volume fraction of Cr 3 Si,the higher the hardness and the we ar resistance of the laser clad composite coating.Because of the presence of large amount of hard,wear and oxidation resistant primary Cr 3 Si dendrites,the laser clad Cr 2 Ni 3 Si /Cr 3 Si metal silicide composite coating has excellent high-tempera ture wear resistance under high-tem perature sliding wear test conditio ns.

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段刚 王华明.激光熔敷Cr2Ni3Si/Cr3Si金属硅化物复合材料涂层组织与高温耐磨性[J].稀有金属材料与工程,2003,(5):394~397.[Duan Gang, Wang Huaming . Microstructure and High-Temperature Wear Resistance of Laser Clad Cr2Ni3Si/Cr3Si Metal Silicide Composite Coatings on Austenitic Stainless Steel[J]. Rare Metal Materials and Engineering,2003,(5):394~397.]
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  • 最后修改日期:2001-08-21
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