微粒轰击Fe基非晶电弧喷涂层性能强化

发布时间：2018-04-24 23:08

本文选题：喷丸 + 喷砂　；参考：《中国表面工程》2017年05期

【摘要】：为了减小热喷涂层残余应力对涂层质量的不利影响,采用喷丸(砂)微粒轰击与高速电弧喷涂相互循环交替的工艺制备了Fe基非晶涂层,使涂层残余拉应力变为残余压应力,喷丸(砂)强化涂层表面残余应力由未处理涂层表面残余拉应力277 MPa分别变为残余压应力-177 MPa(-91 MPa)。利用电子扫描显微镜、纳米压痕仪、摩擦磨损试验机等分别对涂层的微观形貌、力学性能和摩擦磨损性能进行了测试。结果表明:经过微粒轰击后的涂层表面致密平整,组织结构密实,喷丸(砂)强化涂层的孔隙率仅为1.0%(1.5%),结合强度可达44.6 MPa(56.4 MPa),经过微粒轰击后涂层硬度、弹性模量及摩擦磨损性能都有所提升。喷丸强化涂层局部过度的轰击会使涂层结合强度及摩擦磨损性能略有下降。
[Abstract]:In order to reduce the adverse effect of residual stress on the coating quality, Fe-based amorphous coatings were prepared by the process of alternating shot (sand) particle bombardment and high-speed arc spraying, which made the residual tensile stress of the coating change into residual compressive stress. The residual stress on the surface of the coating strengthened by shot peening (sand) was changed from the residual tensile stress of the untreated coating surface to the residual compressive stress of -177 MPa(-91 MPA, respectively. The microstructure, mechanical properties and friction and wear properties of the coatings were measured by SEM, nano-indentation and friction and wear tester. The results showed that the surface of the coating was compact and smooth, the microstructure was dense, the porosity of shot peening (sand) strengthened coating was only 1.0% and 1.5%, the bonding strength was up to 44.6 MPa(56.4 MPA, and the hardness of the coating was obtained after particle bombardment. The elastic modulus and friction and wear properties are improved. The bonding strength and friction and wear properties of the coating decreased slightly due to the local excessive bombardment of shot peening strengthened coating.
【作者单位】：装甲兵工程学院机械产品再制造国家工程研究中心;装甲兵工程学院再制造技术重点实验室;
【基金】：国家自然科学基金(51375492,51575527) 教育部新世纪优秀人才支持计划(NCET-13-1068)~~
【分类号】：TG174.4;TG668

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