爆炸喷涂WC-Co/MoS<sub>2</sub>-Ni多层复合自润滑涂层的摩擦学行为

doi:10.11868/j.issn.1001-4381.2016.000002

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摘要

采用爆炸喷涂技术研制WC-Co/MoS₂-Ni多层复合自润滑涂层，系统研究涂层的微观结构、元素分布、结合强度和摩擦磨损性能。结果表明：在高温爆炸喷涂过程中，少量MoS₂发生氧化分解，生成SO₂气体，残留在涂层内的SO₂气体可使局部形成微小孔洞。在摩擦测试中，WC-Co涂层在预磨阶段摩擦因数迅速上升，进入稳定阶段后，摩擦因数缓慢增加；而多层复合涂层的摩擦因数在经历预磨阶段迅速上升后，很快进入稳定阶段，直至表层WC-Co涂层被磨穿后，摩擦因数开始逐渐下降。添加自润滑涂层MoS₂-Ni后，WC-Co涂层的内聚结合强度略有下降，但减摩效果显著，摩擦因数下降了约40%，耐磨性能略有提升。

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	王铁钢
	李柏松
	阎兵
	范其香
	刘艳梅
	宫骏
	孙超

关键词 ： WC-Co/MoS₂-Ni涂层, 自润滑涂层, 爆炸喷涂, 摩擦磨损

Abstract：

The multilayered composite WC-Co/MoS₂-Ni self-lubricating coatings were prepared by detonation gun spraying technology. The coating microstructure, element distribution, adhesive strength, and tribological properties were studied systematically. The results show that a little of MoS₂ is oxidized and decomposed into gas of SO₂ during the high-temperature spraying process. The SO₂ left in the coating and can form into the micro porosities. The friction coefficient of the WC-Co coating first increases rapidly in the initial running-in phase, and then gradually increases slightly after entering into the steady-state phase; whereas the friction coefficient of multilayer composite coating steps in the steady-state phase soon and starts to decline gradually when the top WC-Co coating became perforated. By comparison, the coating cohesion declines slightly after adding the self-lubricating layer MoS₂-Ni, but the friction coefficient decreases by about 40%, and the wear resistance is also improved slightly.

Key words： WC-Co/MoS₂-Ni coating self-lubricating coating detonation gun spraying friction and wear

收稿日期: 2016-01-04 出版日期: 2017-03-22

中图分类号:

TH117.3

基金资助:国家自然科学基金(51301181);天津市应用基础与前沿技术研究计划(15JCZDJC39700);天津市科技特派员项目(16JCTPJC49500);天津市高等学校创新团队培养计划项目(TD12-5043);天津职业技术师范大学科研发展基金(KJ14-22)

通讯作者: 王铁钢 E-mail: sytgwang@163.com;tgwang@tute.edu.cn

作者简介: 王铁钢 (1978-), 男, 副教授, 博士后, 研究方向:硬质涂层, 联系地址:天津市高速切削与精密加工重点实验室 (300222), E-mail:sytgwang@163.com; tgwang@tute.edu.cn

引用本文:

王铁钢, 李柏松, 阎兵, 范其香, 刘艳梅, 宫骏, 孙超. 爆炸喷涂WC-Co/MoS₂-Ni多层复合自润滑涂层的摩擦学行为[J]. 材料工程, 2017, 45(3): 73-79.
Tie-gang WANG, Bai-song LI, Bing YAN, Qi-xiang FAN, Yan-mei LIU, Jun GONG, Chao SUN. Tribological Behavior of Multi-layered WC-Co/MoS₂-Ni Self-lubricating Coating Fabricated by Detonation Gun Spraying. Journal of Materials Engineering, 2017, 45(3): 73-79.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.000002 或 http://jme.biam.ac.cn/CN/Y2017/V45/I3/73

Table 1 爆炸喷涂工艺参数

Fig.1 WC-Co/MoS₂-Ni多层复合涂层的截面形貌 (a) 全貌；(b) 局部放大

Fig.2 MoS₂-Ni涂层的S 2p XPS谱 (a) 和Mo 3d解谱 (b)

Fig.3 WC-Co/MoS₂-Ni多层复合涂层截面元素的分布及背散射图像 (a) BSE图像；(b) W；(c) Co；(d) Mo；(e) S；(f) Ni

Fig.4 WC-Co/MoS₂-Ni多层复合涂层摩擦磨损实验时的截面示意图

Fig.5 多层复合自润滑涂层经不同滑动时间的摩擦学性能 (a) 摩擦因数；(b) 磨损体积

Fig.6 多层复合涂层在不同时间的磨损形貌 (a)30min；(b)45min；(c)60min；(d)90min；(e)图 6(a)中选区的EDS分析结果

Fig.7 法向载荷为30N时，WC-12%Co涂层与WC-Co/MoS₂-Ni多层复合涂层的摩擦因数

Fig.8 法向载荷为30N，与Si₃N₄球对磨30min后，WC-12% Co涂层和多层复合涂层的磨损体积 (a) 和磨损率 (b)

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