(北京师范大学核科学与技术学院，射线束技术教育部重点实验室，北京100875)
摘 要: 石墨/铜基复合材料可以同时具有良好的导热性和润滑性。本文尝试采用超大粒度(粒度约为1500 μm)的石墨颗粒制备石墨/铜基复合材料，以获得更加简便高效的制备工艺方法以及性能优良的复合制品。采用粉末烧结工艺探讨了不同工艺参数对复合材料内部组织结构及相对密度的影响。结果发现：影响该复合材料组织结构的主要因素为石墨添加量及其颗粒的粒度，石墨颗粒粒度为1500 μm的复合材料相对密度较大，1000℃烧结2.5 h时相对密度高达0.67；采用等质量的较小粒度石墨颗粒时，同样条件下烧结所得的复合材料相对密度较小，石墨颗粒粒度为120 μm的复合材料相对密度仅为0.43。
关键字: 石墨/铜基复合材料；组织结构；相对密度
（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
