【摘要】：碳納米管增強銅基復(fù)合材料以其良好的導(dǎo)電性、導(dǎo)熱性及低的熱膨脹系數(shù)而受到材料工作者的極大關(guān)注。盡管從目前來看其研究已取得了一些進展,但總的來說綜合性能與人們的預(yù)期相距較遠,現(xiàn)有的技術(shù)路線還無法滿足人們對低成本、規(guī)�；苽鋬�(yōu)異綜合性能的碳納米管增強銅基復(fù)合材料的期待。針對以上問題,本論文利用粉末冶金的方法制備得到了碳納米管增強銅基復(fù)合塊材,然后對得到的復(fù)合塊材在合適的軋制工藝下進行了熱軋?zhí)幚�。并研究了退火工藝對�?fù)合塊材組織和性能的影響。最后對軋制后得到的復(fù)合塊材進行了耐摩擦磨損、熱膨脹、耐腐蝕性能測試。(1)經(jīng)過合適的混料、壓制、脫脂、熱燒結(jié)工藝后能夠得到宏觀形貌較為完整微觀組織分布均勻的樣品,通過對不同燒結(jié)溫度下燒結(jié)體組織形貌的比較發(fā)現(xiàn),燒結(jié)體在溫度升高的過程中存在明顯的縮頸現(xiàn)象。對不同燒結(jié)工藝下得到的復(fù)合塊材斷面形貌的對比分析發(fā)現(xiàn),適當?shù)奶岣邷囟群捅貢r間有益于樣品燒結(jié)體的熔合。綜合各方面因素,我們選定最終的燒結(jié)程序為980℃保溫1h。(2)對不同碳納米管含量的復(fù)合塊材斷面形貌對比發(fā)現(xiàn),隨著碳納米管含量上升,其燒結(jié)后斷面形貌的孔隙明顯增多,并且銅基底也開始出現(xiàn)顆粒狀物質(zhì)的析出,并且隨著碳納米管含量的上升,析出顆粒物的尺寸與數(shù)量逐漸增多。(3)利用熱軋?zhí)幚硎沟迷嚇幼罱K的致密度、密度、顯微硬度得到顯著提升,對不同碳納米管含量的復(fù)合塊材金相顯微組織形貌分析發(fā)現(xiàn),隨著碳納米管含量的增加,組織中開始出現(xiàn)明顯的團聚現(xiàn)象。在此基礎(chǔ)上,我們還比較了退火工藝中退火保溫溫度、保溫時間的對樣品組織形貌及顯微硬度的影響,發(fā)現(xiàn)隨著保溫溫度的提高和保溫時間的增加,樣品的顯微硬度都會增加。(4)碳納米管的加入對于復(fù)合塊材的耐磨損性能、熱膨脹性能以及耐腐蝕性能都有明顯的幫助。碳納米管含量為1%時得到的復(fù)合塊材耐磨損能力最好。并且隨著加載載荷的增大、加載速率的升高,復(fù)合塊材的耐磨損性能逐漸下降。當碳納米管含量為1%時熱膨脹系數(shù)最小。通過對比添加碳納米管與未添加碳納米管的復(fù)合塊材的腐蝕形貌以及腐蝕產(chǎn)物的分析發(fā)現(xiàn),碳納米管的加入對于復(fù)合塊材耐腐蝕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，

本文編號：2194319