摘要钨铜复合材料是一种研究材料性能的理想模型材料，并且广泛应用于电接触材料、电极材料。本文通过球磨-压制-烧结的粉末冶金方法制备了相对密度达85%、成分比较均匀、具备一定塑性的W30Cu70复合材料，主要研究了球磨时间和烧结工艺对W30Cu70复合材料性能的影响以及致密度与各性能之间的关系。研究结果表明：增加球磨时间，改善粉末粒度组成，可提高压坯和烧结体致密度，并且试样的硬度、导电率和抗拉强度更高；复压复烧工艺提高致密度的同时引起试样组织中钨颗粒一定程度的长大；结合应力-应变曲线与拉伸断口SEM分析，球磨20h、复压复烧的W30Cu70的塑性最好，其次是球磨8h、复压复烧的W30Cu70；导电率与致密度之间的关系可由y=2。39747x-155。6404来表达，理论上，致密度达到100%时，导电率为84%IACS；抗拉强度与致密度之间的关系可用y=8。82533x-612。996来表达，理论上，致密度达到100%时，抗拉强度可达269Mpa。87607

毕业论文关键词  钨铜复合材料  致密度  性能   

毕业设计说明书外文摘要

Title  Research on Preparation,Microstructure and Properties of W-Cu Composite                                         

Abstract W-Cu composite is an ideal model meteratial to study properties and is widely used in electrical contact meterials and electrode meterials。In this paper,W30Cu70 which has relative density of 85%,uniform microstruture and plasticity,were prepared by powder metallurgy method which contains three processes:ball milling,pressing and sintering。The effects of milling time and sintering process on the properties of W-Cu composites and the relaitionship between relative density and properties were studied。 Results of this research show that,increasing ball milling time leads to an improvement in compacting and sintering density。And the hardness,electrical conductivity,tensile strength are also higher。Repressing and resintering processes can increase the size of tungsten grains。Synthesize the stress-strain curve and SEM of tensile strength,plasticity of W30Cu70 which is processed by 20h ball milling with repressing and resintering process is the best,followed by W30Cu70 which is processed by 8h ball milling with repressing and resintering process。The reationship between electric conductivity and relative density can be expressed as y=2。39747x-155。6404。Theoretically,when relative density of the sample reaches 100%, electrical conductivity reaches 84%。The relationship between tensile strength and relative density can be expressed as y=8。82533x-612。996。Theoretically,when relative density reaches 100%,tensile strength can be 269Mpa。 

Keywords  W-Cu composite  relative density  properties   

目   次

1  绪论 1

1。1  W-Cu复合材料的应用 1

1。2  W-Cu复合粉末的制备技术 2

1。3  W-Cu复合材料的成形技术 3

1。4  W-Cu复合材料的烧结技术 4

1。5  课题的提出及内容 6

2  实验材料及实验方法 7

2。1  实验材料 7

2。2  实验方法 7

2。3  组织观察 9

2。4  XRD分析 9

2。5  维氏硬度