摘要
为了得到高导热、高结合力的金刚石-金属基复合材料,解决金刚石与金属之间浸润性差的关键问题,本文首先通过高温盐浴法对金刚石粉体表面进行硼改性处理,然后将金刚石粉体与金属粉体通过真空热压制备得到改性后的金刚石-金属基复合材料。采用扫描电子显微镜(SEM),能谱仪(EDS),排水法密度测试仪,激光热导仪(LFA),热膨胀系数测定仪,X射线衍射仪(XRD)一系列的方法分别探究了镀硼对材料的形貌,元素种类,复合材料的密度,热导性能,热膨胀系数和物相成分的影响。结果表明,金刚石粉体经硼化处理后,制备得到的金刚石-金属基复合材料界面粘结能力强,界面层与层之间为化学键结合。相比未前处理过的金刚石压制得到的复合材料,表现出高导热、高结合力的优异性能。镀硼金刚石-铝复合材料无水解性Al4C3生成,且材料热导率达到560 W/(m·K)。
In order to solve the key problem of poor wettability of diamond with metal so as to get a type of diamondmetal matrix composite with higher thermal conductivity and stronger adhesive force, the boron treatment for the surface modification of the diamond particles were carried out by high temperature salt bath method. Then the diamond particles and the metal powder were used for the preparation of diamond-metal matrix composite by hot vacuum pressing. A series of instruments including scanning electron microscope（SEM）, energy dispersive spectrometer（EDS）, drainage density tester,laser flash apparatus（LFA）, thermal expansion coefficient apparatus, X-ray diffractometer（XRD） were employed to investigate the effects of the boron treatment on the morphologies, element type, density, thermal conductivity and thermal expansion coefficient of the composite, respectively. The results show that the adhesive capacity between the diamond and the metal is improved, the interface between the layers is combined by chemical bond, and the composite presents excellent properties of higher thermal conductivity and stronger adhesive force than that untreated. No hydrolysis phase（Al4 C3）generates at the diamond-aluminum interface of the diamond-aluminum composite pretreated by boron powder, and the thermal conductivity of the composite can reach 560 W/（m·K）.
出处
《硬质合金》
CAS
2017年第5期314-319,共6页
Cemented Carbides
基金
国家青年基金(51501209)
国际合作基金(S2015ZR1100)~~
关键词
盐浴法
金刚石
硼化处理
表面改性
复合材料
salt bath
diamond
boron treatment
surface modification
composite
