Surface metallization of solid lubricants and its effect on the mechanical properties of Fe-based bit matrix
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摘要: 自润滑孕镶金刚石钻头可为月球钻探难题提供新的技术方案,但固体润滑剂与钻头胎体之间湿润性较差,会导致胎体物理力学性能下降。研究固体润滑剂MoS2、WS2、CaF2自身材料特性差异及其对表面化学镀覆效果的影响,并探究了固体润滑剂镀覆前后对钻头胎体压入硬度和抗弯强度的影响。结果表明:化学镀可实现对上述3种固体润滑剂的表面镀镍处理,但镀覆效果存在一定差异;在相同体积浓度条件下,MoS2和WS2表面金属化能提升自润滑孕镶金刚石钻头胎体的力学性能,但CaF2的效果不明显。Abstract: Self-lubricating impregnated diamond bit can provide a new technical solution to the lunar drilling problem, but the poor wettability between the solid lubricants and the bit matrix can lead to degradation of physical and mechanical properties of the bit matrix. The influence of properties of the solid lubricant MOS2, WS2 and CAF2 on the electroless plating was studied, and the influence of the solid lubricant coating on the indentation hardness and bending strength of the bit matrix was investigated. The results show that the surface nickel plating of the above three solid lubricants can be achieved by the chemical plating method, but there are some differences in their plating appearances. Under the same volume concentration of condition, MoS2 and WS2 surface metallization can improve the mechanical properties of self-lubricating impregnated diamond bit matrix, but the effect of CaF2 is insignificant.
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Key words:
- diamond bit /
- self-lubrication /
- chemical plating /
- surface metallization /
- lunar drilling
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表 1 化学镀相关溶液
Table 1. Chemical plating related solutions
预处理 化学镀
镀液(用氨水调pH=9)清洗 粗化 敏华、活化 解胶 ωNaOH=
10%ωHNO3=
10%A液:0.3 g PdCl2
10 mL浓盐酸
12 g SnCL2
B液:160 g NaCl
1000 mL 蒸馏水50 mL
稀盐酸500 mL 蒸馏水
12.5 g 硫酸镍
12.5 g 次磷酸钠
25 g 柠檬酸钠
15 g 氯化铵表 2 胎体试样配方
Table 2. Formulation of specimens of matrix
试样 固体润滑剂 试样中固体润滑剂体积分数 φ/% 1# MoS2 4 2# Ni包MoS2 4 3# WS2 4 4# Ni包WS2 4 5# CaF2 4 6# Ni包CaF2 4 -
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