【作者】 王书伟；

【导师】 史晓亮；

【作者基本信息】 武汉理工大学 ， 材料物理与化学， 2010， 硕士

【摘要】 钨铜复合材料具有高强度、高硬度、导电性和导热性好、热膨胀系数小、抗腐蚀和抗氧化性好、焊接性和机械加工性好等一系列优异的物理性能和使用性能,被广泛用作大功率微电子设备中的电接触材料和热沉材料。本研究通过引入纤维与晶须增强、工艺参数的优化等方面,探索关键的制备技术并生产出性能优于传统钨铜材料的、符合更高要求的钨铜复合材料。实验采用溶解度高的偏钨酸铵和硝酸铜为前驱体,经喷雾热解-共还原法制备出超细W-20Cu复合粉末。将C纤维(CO、SiC晶须(SiCw)、SiC纤维(SiCf)通过真空气相沉积法镀上一层钛或氮化钛。所制得的W-20Cu粉末经行星式球磨机球磨后分别与适量经镀膜处理的Cf、SiCf、SiCw混合并超声分散,在不同的工艺制度下通过热压烧结、放电等离子(SPS)烧结制得W-20Cu复合材料。实验结果得出：1)由喷雾热解-共还原法制备超细W-20Cu复合粉末,经热压烧结的掺杂0.6wt.%镀钛SiCw的W-20Cu复合材料的各项性能分别达到了：抗弯强度1197MPa,致密度99.1%,热导率221 W·m-1.K-1。2)由喷雾热解-共还原法制备超细W-20Cu复合粉末,经SPS烧结的掺杂0.8wt.%镀氮化钛SiCf的W-20Cu复合材料的各项性能分别达到了：抗弯强度1200 MPa,致密度98.5%,热导率235 W·m-1.K-1。3)由喷雾热解-共还原法制备超细W-20Cu复合粉末,经SPS烧结的掺杂1.0wt.%镀钛Cf的W-20Cu复合材料的各项性能分别达到了：抗弯强度1061MPa,致密度98.5%,热导率244 W·m-1·K-1。4)相比W-20Cu合金,掺杂0.6wt.%镀钛SiCw的W-20Cu复合材料的抗弯强度、导热性分别提高了49.6%和22.2%；掺杂0.8wt.%镀氮化钛SiCf的W-20Cu复合材料的抗弯强度、导热性分别提高了50.0%和30.6%；掺杂1.0wt.%镀钛Cf的W-20Cu复合材料的抗弯强度、导热性分别提高了32.6%和24.4%。本研究为SiCw、SiCf和Cf的表面处理工艺及其在钨铜复合材料中的应用做了有益的尝试和探索,为高性能钨铜复合材料的产业化和工业应用提供了一定的实验基础和依据。更多还原

【Abstract】 W-Cu composites exhibit excellent physical and mechanical properties such as high strength and hardness, high thermal and electrical conductivity, low heat expansion coefficient, corrosion and oxidation resistance, good machining property and weld performance. W-Cu materials have been widely used for heavy-duty electronic contacts and heat sink materials for high-power microelectronic devices because of the high electrical conductivity of Cu and high ablation resistance of W.The essential point of this research is to research the mechanism of fiber/ whisker reinforcement and manufacture excellent W-20Cu composites by optimizing its processing or controlling parameter. In this study, aqueous solution composed of ammonium metatungstate and copper nitrate were used as the starting material, by spray drying of aqueous salt solutions and a milling process followed by reduction of the oxide powder. Ti-coated carbon fiber (Cf), Ti-coated SiC whisker (SiCw), TiN-coated SiC fiber (SiCf) by vacuum slow vapor deposition and W-20Cu composite powder prepared by spray drying & calcining-continuous reduction technology were mixed by ball-milling in ethanol solution, respectively. Hot-press sintering and spark plasma sintering (SPS) was used to prepare the W-20Cu composites, respectively. The results are showed as follows:1) W-20Cu composites reinforced by 0.6wt.% Ti-coated SiCw prepared by hot-press sintering with transverse rupture strength (TRS) of 1197MPa, thermal conductivity (TC) of 220 W·m-1·K-1 and relative density of 99.1% were obtained.2) W-20Cu composites reinforced by 0.8wt.% TiN-coated SiCf prepared by SPS with TRS of 1200MPa, TC of 235 W·m-1·K-1 and relative density of 98.5% were obtained.3) W-20Cu composites reinforced by 1.0wt.% Ti-coated Cf prepared by SPS with TC of 224 W·m-1·K-1, relative density 98.5% and TRS 1061 MPa were obtained.4) The TRS and TC of the 0.6 wt.% Ti-coated SiCw/W-20Cu composites, compared with the monolithic W-20Cu alloy, were enhanced 49.6% and 22.2%, respectively. The TRS and TC of the 0.8 wt.% TiN-coated SiCf/W-20Cu composites, compared with the monolithic W-20Cu alloy, were enhanced 50% and 30.6%, respectively. The TRS and TC of the 1.0 wt.% Ti-coated Cf/W-20Cu composites, compared with the monolithic W-20Cu alloy, were enhanced 32.6% and 24.4%, respectively.These results provide instructive attempts of the surface treatment of SiCw, Cf and SiCf and the application in W-Cu composites. The main conclusions of this research provide many experimental foundations and bases for the industrialization and widely uses of high quality tungsten-copper composites.更多还原