碳纳米管增强铜基复合材料的制备及性能测试
发布时间：2018-08-20 16:48
【摘要】：碳纳米管增强铜基复合材料以其良好的导电性、导热性及低的热膨胀系数而受到材料工作者的极大关注。尽管从目前来看其研究已取得了一些进展,但总的来说综合性能与人们的预期相距较远,现有的技术路线还无法满足人们对低成本、规模化制备优异综合性能的碳纳米管增强铜基复合材料的期待。针对以上问题,本论文利用粉末冶金的方法制备得到了碳纳米管增强铜基复合块材,然后对得到的复合块材在合适的轧制工艺下进行了热轧处理。并研究了退火工艺对复合块材组织和性能的影响。最后对轧制后得到的复合块材进行了耐摩擦磨损、热膨胀、耐腐蚀性能测试。(1)经过合适的混料、压制、脱脂、热烧结工艺后能够得到宏观形貌较为完整微观组织分布均匀的样品,通过对不同烧结温度下烧结体组织形貌的比较发现,烧结体在温度升高的过程中存在明显的缩颈现象。对不同烧结工艺下得到的复合块材断面形貌的对比分析发现,适当的提高温度和保温时间有益于样品烧结体的熔合。综合各方面因素,我们选定最终的烧结程序为980℃保温1h。(2)对不同碳纳米管含量的复合块材断面形貌对比发现,随着碳纳米管含量上升,其烧结后断面形貌的孔隙明显增多,并且铜基底也开始出现颗粒状物质的析出,并且随着碳纳米管含量的上升,析出颗粒物的尺寸与数量逐渐增多。(3)利用热轧处理使得试样最终的致密度、密度、显微硬度得到显著提升,对不同碳纳米管含量的复合块材金相显微组织形貌分析发现,随着碳纳米管含量的增加,组织中开始出现明显的团聚现象。在此基础上,我们还比较了退火工艺中退火保温温度、保温时间的对样品组织形貌及显微硬度的影响,发现随着保温温度的提高和保温时间的增加,样品的显微硬度都会增加。(4)碳纳米管的加入对于复合块材的耐磨损性能、热膨胀性能以及耐腐蚀性能都有明显的帮助。碳纳米管含量为1%时得到的复合块材耐磨损能力最好。并且随着加载载荷的增大、加载速率的升高,复合块材的耐磨损性能逐渐下降。当碳纳米管含量为1%时热膨胀系数最小。通过对比添加碳纳米管与未添加碳纳米管的复合块材的腐蚀形貌以及腐蚀产物的分析发现,碳纳米管的加入对于复合块材耐腐蚀性能的提高是有利的。
[Abstract]:Carbon nanotubes (CNTs) reinforced copper matrix composites have attracted great attention due to their good electrical conductivity, thermal conductivity and low thermal expansion coefficient. Although there has been some progress in its research at present, overall performance is far from expectations, and the existing technological routes are not yet able to meet the low costs. Large scale preparation of carbon Nanotubes reinforced Copper Matrix Composites with excellent Properties. In order to solve the above problems, carbon nanotube reinforced copper based composite blocks were prepared by powder metallurgy, and then the composite blocks were hot-rolled under the appropriate rolling process. The effect of annealing process on the microstructure and properties of composite blocks was studied. Finally, the friction and wear resistance, thermal expansion and corrosion resistance of the rolled composite blocks were tested. (1) after proper mixing, pressing, degreasing, After the hot sintering process, the samples with more complete microstructure and even distribution can be obtained. By comparing the microstructure of the sintered body at different sintering temperatures, it is found that there is an obvious necking phenomenon in the process of increasing the temperature of the sintered body. It is found that proper increase of temperature and holding time is beneficial to the fusion of the sintered sample by comparing and analyzing the cross section morphology of the composite bulk obtained by different sintering processes. Taking all factors into account, we selected the final sintering procedure as 980 鈩，
本文编号：2194319
[Abstract]:Carbon nanotubes (CNTs) reinforced copper matrix composites have attracted great attention due to their good electrical conductivity, thermal conductivity and low thermal expansion coefficient. Although there has been some progress in its research at present, overall performance is far from expectations, and the existing technological routes are not yet able to meet the low costs. Large scale preparation of carbon Nanotubes reinforced Copper Matrix Composites with excellent Properties. In order to solve the above problems, carbon nanotube reinforced copper based composite blocks were prepared by powder metallurgy, and then the composite blocks were hot-rolled under the appropriate rolling process. The effect of annealing process on the microstructure and properties of composite blocks was studied. Finally, the friction and wear resistance, thermal expansion and corrosion resistance of the rolled composite blocks were tested. (1) after proper mixing, pressing, degreasing, After the hot sintering process, the samples with more complete microstructure and even distribution can be obtained. By comparing the microstructure of the sintered body at different sintering temperatures, it is found that there is an obvious necking phenomenon in the process of increasing the temperature of the sintered body. It is found that proper increase of temperature and holding time is beneficial to the fusion of the sintered sample by comparing and analyzing the cross section morphology of the composite bulk obtained by different sintering processes. Taking all factors into account, we selected the final sintering procedure as 980 鈩，
本文编号：2194319
本文链接：https://www.wllwen.com/kejilunwen/cailiaohuaxuelunwen/2194319.html
