摘要
目的采用高频感应熔覆技术,在35CrMo钢表面制备TiB_2增强Ni基涂层,并研究TiB_2添加量对Ni基涂层的组织、硬度以及耐磨性的影响规律。方法利用光学显微镜和扫描电子显微镜观察Ni基涂层的微观组织形貌。利用EDS能谱分析仪对熔覆层不同区域的显微组织进行成分分析,并结合X射线衍射仪对涂层进行物相分析。利用HXD-2000TM/LCD显微硬度计对试样的截面进行硬度测试。在MDW-100型磨损实验机上进行销盘副磨损实验,评价涂层的耐磨性。结果感应熔覆Ni基涂层无裂缝、气孔等缺陷,与基体形成冶金结合。涂层的主要物相为γ-Ni、Ni_2B、CrB、Cr_(23)C_6等。添加TiB_2颗粒后,熔覆过程中TiB_2颗粒并未发生分解。随着TiB_2添加量的增加,Ni基涂层的硬度逐渐增大,耐磨性逐渐增强,添加15%TiB_2颗粒的涂层硬度最大,摩擦系数最小。与不添加TiB_2的涂层相比,在相同的磨损条件下,添加15%TiB_2的涂层硬度提高了15.88%,摩擦系数降低了16.5%,磨损量减少了43.15%。结论 TiB_2颗粒的添加使得涂层的硬度增大,耐磨性增强。与此同时,添加15%TiB_2颗粒的涂层性能最为优异。
The work aims to prepare Ni-based coatings enhanced by TiB2 on 35 Cr Mo steel by using frequency induction cladding technology, and study the law of influence of TiB2 content on microstructure, hardness and abrasion resistance of Ni-based coatings. Microstructure morphology of Ni-based coatings was observed with optical microscope and scanning electron microscope. Chemical composition of microstructure in different areas of cladding layer was completed with EDS energy dispersive spectrometer. Phase of the coatings was analyzed by combining X-ray diffractometer. Hardness of the coating cross-section was measured with HXD-2000 TM/LCD microhardness tester. Pin-on-disk abrasion test was performed on MDW-100 abrasion machine to evaluate abrasion resistance of coatings. The Ni-based coatings treated by induction cladding were free from such defects as cracks and pores, and exhibited metallurgical bonding to substrate. The coatings were mainly composed of γ-Ni, Ni2B, CrB, Cr（23）C6, etc. TiB2 particles added did not decompose during the cladding process. With the increase of TiB2 addition, both hardness and abrasion resistance of Ni-based coatings gradually increased. Hardness of the coating with 15% TiB2 addition was the highest and its friction coefficient was the lowest. Compared with the TiB2-free coating, under the same wear conditions, hardness of the coating containing TiB2 increased by 15.88%, friction coefficient decreased by 16.5%, and wear loss decreased by 43.15%. The addition of TiB2 particles increased both hardness and abrasion resistance of the coatings. Meanwhile, the coating containing 15% TiB2 particles exhibits the best coating performance.
作者
黄本生
李天宁
熊万能
明柯宇
高钰枭
HUANG Ben-sheng;LI Tian-ning;XIONG Wan-neng;MING Ke-yu;GAO Yu-xiao(School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2018年第6期75-82,共8页
Surface Technology
基金
西南石油大学大学生课外开放实验项目~~
关键词
感应熔覆
镍基涂层
TIB2
显微硬度
耐磨性
induction cladding
Ni-based coating
TiB2
microhardness
abrasion resistance
