摘要
用超音速火焰喷涂技术在10Cr9Mo1VNb耐热钢基体上制备了NiCr-Cr_(3)C_(2)耐冲蚀金属陶瓷涂层,620℃下用Fe_(2)O_(3)颗粒分别以210 m/s和300 m/s的速度对基体和涂层进行冲蚀实验;利用金相显微镜、显微硬度计、扫描电子显微镜、激光显微系统研究了涂层的金相组织、硬度、冲蚀形貌及元素分布;通过质量冲蚀率表征冲蚀结果。结果表明:涂层组织致密,碳化物颗粒分布均匀;硬度范围在760 HV~930 HV之间。210 m/s冲蚀速度下,NiCr-Cr_(3)C_(2)涂层的冲蚀率仅为0.1292%,约为基体冲蚀的1/6;300 m/s冲蚀速度NiCr-Cr_(3)C_(2)涂层冲蚀率为3.3165%,约为耐热钢基体冲蚀率的1/2。涂层表现出脆性材料和韧性材料混合冲蚀机制,基体材料表现为典型的韧性材料冲蚀机制。采用超音速火焰喷涂工艺制备的NiCr-Cr_(3)C_(2)涂层表现出优异的防固体颗粒冲蚀性能。
NiCr-Cr_(3)C_(2)erosion resistant cermet coating was prepared on 10 Cr9 Mo1 VNb heat resistant steel substrate by high velocity oxygen-fuel(HVOF)technology.The erosion experiments were carried out at 620℃with Fe_(2)O_(3)particles at 210 m/s and 300 m/s,respectively.The microstructure,hardness,erosion morphology and element distribution of the coating were studied by metallographic microscope,microhardness tester,scanning electron microscope and laser microscope.The erosion rate was calculated by weight loss method.The results shows that the microstructure of the coating is compact and the carbide particles were evenly distributed.The hardness ranges from 760 HV to 930 HV.At 210 m/s,the erosion rate of NiCr-Cr_(3)C_(2)coating is only 0.1292%,which is about 1/6 of that of the substrate;The erosion rate of NiCr-Cr_(3)C_(2)coating is 3.3165%at 300 m/s,which is about 1/2 of that of heat-resistant steel substrate.The coatings show mixed erosion mechanism of brittle material and ductile material.The matrix material shows typical erosion mechanism of ductile material.NiCr-Cr_(3)C_(2)coatings prepared by HVOF process exhibit excellent erosion resistance to solid particles.
作者
郭显平
曹晓英
王伟
李定骏
王斌
叶洋程
Guo Xianping;Cao Xiaoying;Wang Wei;Li Dingjun;Wangbin;Ye Yangcheng(Southwest Petroleum University,Chengdu 610000;,2.Dongfang Turbine Co.,Ltd.,State Key Laboratory of long-life high temperature materials,Deyang 618000)
出处
《热喷涂技术》
2021年第3期41-47,共7页
Thermal Spray Technology
基金
国家重点研发计划(2020YFB20104)
两机专项(2019-VII-0007-0147)
关键词
耐热钢
金属陶瓷涂层
固体颗粒冲蚀
冲蚀率
冲蚀形貌
Heat resistant steel
Cermet coating
Solid particle erosion
Erosion rate
Erosion morphology
