hBN含量对等离子喷涂NiCr/Cr_3C_2-hBN复合涂层力学性能的影响  

Effect of h BN content on mechanical properties of plasma-sprayed NiCr/Cr_3C_2-h BN composite coating

作　　者：曹玉霞[1] 杜令忠[2] 张伟刚[2] 兰叶 黄传兵[2] 

机构地区：[1]唐山学院环境与化学工程系,河北唐山063000 [2]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [3]博天环境集团股份有限公司,北京100082

出　　处：《金属热处理》2015年第6期163-166,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(51471159);河北省自然科学基金(E2015105068);唐山市科技计划项目(14130286a);唐山学院材料科学与工程重点学科(TSC2013003)

摘　　要：采用化工冶金包覆、喷雾造粒和固相合金化技术以Cr3C2和hBN为核心制备了NiCr/Cr3C2-h BN复合粉体,并用等离子喷涂技术制备了NiCr/Cr3C2-hBN涂层,研究了涂层的显微结构、物相组成、显微硬度和结合强度。研究结果表明,等离子喷涂NiCr/Cr3C2-h BN复合涂层呈典型的层状结构,各层之间结合良好。涂层的显微硬度和结合强度均随hBN含量的增加逐渐降低,当hBN含量为20%时,涂层的显微硬度和结合强度分别为NiCr/Cr3C2涂层的66%和50%。涂层断裂位置发生在涂层内部,为典型的脆性断裂。Taking hBN and Cr3C2 as core,NiCr/Cr3C2-hBN composite powder were prepared with the technologies of spray granulation,chemical and metallurgical coating and solid state alloying. The NiCr/Cr3C2-h BN composite coating was prepared by plasma-spray technology. Microstructure,phase composition,microhardness and tensile strength of the coating were investigated. The results show that the NiCr/Cr3C2-h BN composite coating consisted of typical lamellae and exhibited excellent binding strength. Both the microhardness and binding strength of the coating decrease with the increase of h BN content. When the hBN content is 20%,microhardness and tensile strength of the coating are 66% and 50% of these of the NiCr/Cr3C2 coating,respectively. The peeling occurs inside coating and is typical brittle fracture.

关 键 词：NiCr/Cr3C2-hBN复合涂层 等离子喷涂 显微硬度 结合强度 

分 类 号：TG174.4[金属学及工艺—金属表面处理]