(北京師范大學(xué)核科學(xué)與技術(shù)學(xué)院，射線束技術(shù)教育部重點實驗室，北京100875)
摘 要: 石墨/銅基復(fù)合材料可以同時具有良好的導(dǎo)熱性和潤滑性。本文嘗試采用超大粒度(粒度約為1500 μm)的石墨顆粒制備石墨/銅基復(fù)合材料，以獲得更加簡便高效的制備工藝方法以及性能優(yōu)良的復(fù)合制品。采用粉末燒結(jié)工藝探討了不同工藝參數(shù)對復(fù)合材料內(nèi)部組織結(jié)構(gòu)及相對密度的影響。結(jié)果發(fā)現(xiàn)：影響該復(fù)合材料組織結(jié)構(gòu)的主要因素為石墨添加量及其顆粒的粒度，石墨顆粒粒度為1500 μm的復(fù)合材料相對密度較大，1000℃燒結(jié)2.5 h時相對密度高達0.67；采用等質(zhì)量的較小粒度石墨顆粒時，同樣條件下燒結(jié)所得的復(fù)合材料相對密度較小，石墨顆粒粒度為120 μm的復(fù)合材料相對密度僅為0.43。
關(guān)鍵字: 石墨/銅基復(fù)合材料；組織結(jié)構(gòu)；相對密度
（Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology,Beijing Normal University, Beijing 100875, China）
Abstract:Graphite/copperbased composites have good thermal conductivity and lubricity at the same time. In this paper, we try to prepare the graphite/copper based composites with the ultra-large graphite particle size of about 1500 μm, in order to develop a more simple and efficient preparation process and obtain the compositeswith excellent properties. The effects of different processing parameters on the microstructure and relative density of the composites were investigated for the powder sintering products. The results show that the main factors affecting the microstructure of the composites are the content of graphite and the particle size. The relative density is relatively large for the composites from graphite particle with particle size of 1500 μm, and it can be as high as 0.67 by sintering at 1000℃for 2.5 h. Using graphite particles with smaller particle size, the relative density is relatively small, and it is only 0.43 for the composites from graphite particle with particle size of 120 μm.
Key words: graphite/copper based composites; structure; relative density
