W-Cu复合材料的激光熔覆快速成形及其性能研究
毕业论文关键词 W-Cu复合材料 激光熔覆 颗粒分布 相对密度
Title Laser Cladding Rapid Protyping Technology for W-Cu Composites and the Study for Its Properties
Abstract
Due to the combination of high strength and good heat resistance of W and high
electrical and thermal conductivity of Cu ,tungsten-copper (W-Cu) composites have
been widely used in aerospace, electronics, machinery and other areas. In this
paper, the laser cladding rapid prototyping for W-Cu composites has been studied.
The influence of the mass ratio of W and Cu on the structure and properties were
investigated .In addition, Ni/Co were added to the W-Cu composites to promote the
sintering densification. The effects of the elements on the structure, phase
composition, relative density and hardness of W-Cu composites were investigated
by using XRD, SEM, EDS, the relative density and hardness test .The relative
mechanism was also analyzed in this paper. The results showed that: When the content
of Cu≥60wt%, the W-rim and Cu-core structure occurred; When it reduced to 20wt.%,
the number of pores will increase. When the content of Ni≥3.0wt.%, γ -Ni phase
can be observed; Co can be dissolved in the Cu phase and enhance the diffusion
of W in Cu phase. Both Ni and Co can increase the density of the W-Cu composites
greatly, and Co is more effective in comparison.
Keywords W-Cu composites Laser Cladding Particle distribution Relative density
目 次
1 引言 1
1.1 W-Cu复合材料 .. 1
1.1.1 W-Cu复合材料的性能 .. 1
1.1.2 W-Cu复合材料的传统制备方法 . 2
1.1.3 钨铜复合材料的发展前景及难题 3
1.2 激光熔覆快速成形 3
1.2.1 激光熔覆 . 3
1.2.2 快速原型 . 4
1.2.3 激光熔覆快速成形 5
1.3 本章总结 .. 10
2 实验步骤 .. 11
2.1 粉末制备 .. 11
2.2 基底处理 .. 12
2.3 激光加工 .. 12
2.4 性能测试 .. 13
2.4.1 金相分析（OM） .. 13
2.4.2 致密度测定 . 14
2.4.3 扫描电镜观察（SEM）及能谱分析（EDS） .. 15
2.4.5 物相分析（XRD） 15
2.4.6 显微硬度测试 15
3 实验结果及分析 .. 16
3.1 W-Cu复合材料的组织结构及性能 . 16
3.1.1 粉末形貌 .. 16
3.1.2 截面形貌 .. 16
3.1.3 截面元素分布 19
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