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TA15-2合金表面激光熔覆Ni基涂层物理与表面性能

Physical and Surface Performance of Laser Clad Ni Based Coating on a TA15-2 Alloy

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摘要

在航空材料TA15-2钛合金基材表面激光同轴送粉熔覆Ni60A-B4C-TiN-CeO2混合粉末可生成硬质耐磨复合涂层。对该涂层进行扫描电镜与高分辨透射电镜微观组织观察。结果表明,大量纳米晶非晶相在该复合涂层中产生。纳米晶非晶相界面具有极高的结合能,可在一定程度上阻碍纳米晶长大;另外,大量纳米晶的产生使晶界自由能提高,导致涂层中点缺陷密度提高与晶格畸变的产生。整个涂层为非晶、纳米晶及其他晶化相共存。涂层较TA15-2基材表现出更好的耐磨损性能,涂层的主要磨损机制为磨粒磨损与粘着磨损。

Abstract

Coaxial powder feeding laser cladding of the Ni60A-B4C-TiN-CeO2 mixed powders on an aviation material TA15-2 titanium alloy substrate can form a hard wear resistance composite coating. Such coating is investigated by means of a scanning electron microscope (SEM) and a high resolution transmission electron microscope (HRTEM). Experimental results indicate that a large amount of nanocrystals-amorphous phases are produced in such composite coating. The nanocrystalline/amorphous interface owns a high bonding energy, which retards the growth of the nanocrystals in a certain extent; and the production of the nanocrystals lead the enhancement of free energy on the crystal boundary, which increases the density of point defect, causing the lattice distortions of the coating. Amorphous, nanocrystals and the other crystalline phases coexist in such coating. Such coating exhibits a better wear resistance than that of a TA15-2 substrate, and the main wear mechanisms of the coating are abrasive grain wear and the adhere wear.

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中图分类号:TG546.7

DOI:10.3788/cjl201340.1103008

所属栏目:激光制造

责任编辑:韩峰  信息反馈

基金项目:国防重大基础科研项目、中国博士后科学基金面上项目(2012M520135)

收稿日期:2013-05-02

修改稿日期:2013-06-28

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李嘉宁:北京航空制造工程研究所, 北京 100024高能束流加工技术重点实验室, 北京 100024中航工业北京航空材料研究院, 北京 100095
巩水利:北京航空制造工程研究所, 北京 100024高能束流加工技术重点实验室, 北京 100024
王西昌:北京航空制造工程研究所, 北京 100024高能束流加工技术重点实验室, 北京 100024
锁红波:北京航空制造工程研究所, 北京 100024高能束流加工技术重点实验室, 北京 100024

联系人作者:李嘉宁(jn2369@163.com)

备注:李嘉宁(1982—),jn2369@163.com男,博士后,主要从事激光快速成型及激光表面强化方面的研究。

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