摘要
为抑制WS2在激光熔覆过程中的分解,增加其与金属基体的相容性,采用化学镀的方法,在WS2粉末颗粒表面包覆一层微米级Ni-P合金,对比研究了添加包覆粉末和未包覆粉末所制备的高温自润滑耐磨复合涂层的微观组织和室温、300℃和600℃下的摩擦学性能。NiCr-Cr3C2/30%WS2(Ni-P)涂层组织主要为初生树枝状Cr7C3、共晶γ-(Fe,Ni)/Cr7C3和CrS,以及少量弥散分布的WS2;对涂层进行摩擦学实验表明,添加包覆粉末所制备的涂层摩擦学性能更佳,室温和300℃时,NiCr-Cr3C2/30%WS2(Ni-P)涂层有较低的摩擦系数,且室温、300℃和600℃时,NiCr-Cr3C2/30%WS2(Ni-P)涂层磨损率都低于NiCr-Cr3C2/30%WS2涂层。
In order to decrease WS2 decomposition and increase its compatibility with the metal matrix during the process of laser cladding, the WS2 powder was encapsulated with a micron-Ni-P layer by electroless plating. The microstructure and tribological properties of the NiCr-Cr3C2/30% WS2 and NiCr-Cr3C2/30% WS2 （Ni-P） high temperature self-lubricating wear-resistant composite coatings at RT（ room temperature） , 300 ℃ and 600℃ were investigated, respectively. The results show that the NiCr-Cr3 C2/30% WS2 （Ni-P） coating consists of primary Cr7 C3 dendrite, 3＇-（ Fe, Ni）/Cr7 C3 eutectic and CrS, Ni-P electroless plating decreases the decomposition of WS2 to some extent, the WS2 solid lubrication particles are uniformly dispersed in the ductile γ-（Fe,Ni） /Cr7 C3 matrix. Friction and wear experiments indicate that the tribological properties of the NiCr-Cr3 C2/30% WS2 （Ni-P） coating is better than that of the NiCr-Cr3 C2/30% WS2 coating, the NiCr-Cr3C2/30% WS2 （Ni-P） coating presents lower friction coefficient at RT and 300 ℃ and lower wear rate from RT to the elevated temperature of 600 ℃.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第6期136-141,共6页
Transactions of Materials and Heat Treatment
基金
江苏省自然科学基金(BK2009134
BK2010267)
苏州市科技计划项目(SYG201233
SG201273
SH201022
SYG201036)
国家自然科学基金(51205266
11172191)
关键词
激光熔覆
化学镀NI-P
固体润滑
摩擦学性能
laser cladding
electroless plating Ni-P
solid lubrication
tribological property
