高导热金刚石/铝复合材料的高温高压制备  

High Thermal Conductivity of Diamond/Al Composites via High Pressure and High Temperature Sintering

作　　者：侯领 沈维霞 房超 张壮飞 张跃文[1] 王倩倩[1] 陈良超 贾晓鹏 HOU Ling;SHEN Weixia;FANG Chao;ZHANG Zhuangfei;ZHANG Yuewen;WANG Qianqian;CHEN Liangchao;JIA Xiaopeng(Key Laboratory of Material Physics of Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450051,Henan,China)

机构地区：[1]郑州大学物理学院(微电子学院)材料物理教育部重点实验室,河南郑州450001

出　　处：《高压物理学报》2020年第5期91-99,共9页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11704340,11804305);河南省科技攻关项目(202102210198)。

摘　　要：以纯铝为基体,使用体积分数为50%的200μm镀钛金刚石为填充材料,利用高温高压粉末冶金法在压力3 GPa、温度700℃条件下烧结10 min得到热导率为529 W/(m·K)的高导热金刚石/铝复合材料。通过光学显微镜和X射线衍射对镀钛金刚石的形貌和物性进行表征,并利用激光导热仪、扫描电镜和热膨胀仪对制备的金刚石/铝复合材料进行性能测试。研究发现,使用放电等离子体烧结制备的镀钛金刚石镀层成分主要是单质钛,并伴有少量碳化钛生成。通过对比在相同制备条件下没有经过镀覆处理的金刚石发现,使用镀钛金刚石能够有效提高金刚石/铝复合材料的热导率。同时,高温高压法能够制备全密度的金刚石/铝复合材料,有效提高铝基体与金刚石的界面结合,减少界面空隙,进而有效提高复合材料的热导率。相比真空热压、放电等离子体烧结、气压熔渗等常规方式,高温高压粉末冶金制备方式具有样品制备周期短(数分钟)的特点。此项研究有助于拓宽高导热复合材料的制备方式,同时能够扩大国内六面顶压机的产品种类,为其他金属基体导热复合材料的制备提供技术支持。Diamond/aluminum composites with a high thermal conductivity of 529 W/(m·K)were prepared using pure aluminum as the matrix and 50 vol.%Ti-coated 200μm diamond as the filling material within 10 min by high temperature(700℃)and high pressure(3 GPa)powder metallurgy method.The morphology and properties of Ti-coated diamond were characterized by optical microscope and X-ray diffraction.The properties of the prepared diamond/aluminum composite were tested by laser thermal diffusion instrument,scanning electron microscope and thermal expansion instrument.It is found that the Ti-coating diamond prepared by spark plasma sintering is mainly composed of titanium and a small amount of titanium carbide.Compared with raw diamond under the same preparation conditions,the Ti-coated diamond could effectively improve the thermal conductivity of diamond/aluminum composites.Meanwhile,the high temperature and high pressure method can be used to prepare the full density of diamond/aluminum composites,which can effectively improve the interface bonding between aluminum matrix and diamond particles,reduce the interface spaces and effectively improve the thermal conductivity of composites.Compared with the conventional methods such as vacuum hot pressing,spark plasma sintering and gas pressure infiltration,the sample preparation period of high temperature and high pressure powder metallurgy is short(several minutes).This research is helpful to expand the preparation method of high thermal conductivity composites,expand the product types of domestic six-sided top press,and provide technical support for the preparation of other metal matrix thermal conductive composites.

关 键 词：高温高压 粉末冶金法 复合材料 金刚石 镀钛 

分 类 号：O521.3[理学—高压高温物理]