摘要
针对添加剂铝能够改善镀钛金刚石/铜的界面粘附力,研究了不同体积分数铝的加入对金刚石-铜的界面、微观结构、界面产物的形成以及热性能的影响。结果表明:铝的加入在金刚石-铜界面之间形成了金属间化合物Al_5 CuTi_2和AlCu_2Ti,金属间化合物的形成明显地改善了金刚石-铜的界面浸润性,提高了复合材料的致密度。然而,随着铝体积分数的增加,复合材料的热导率反而降低,是由于金属间化合物的形成阻碍了有效传热界面,增加了热阻造成的。当铝和金刚石体为分别为2 vol.%和75 vol.%时,样品最高热导率达到了570 W/(m·K)。
The additive aluminum is proposed to improve interfacial bonding between Ti — diamond particles and copper— matrix for Ti — diamond/copper composites.The microstructures,thermal properties,interface reaction production and its effect of the different volume fraction of additive aluminum on the properties of the composites are investigated.The results show that the interfacial bonding of the composites could be strengthened by changing the volume fraction of aluminum,which is attributed to forming intermetallic compounds(Al_5 CuTi_2 and AlCu_2Ti) on the interface between diamond and copper.At the same time,the relative density of diamond/copper composites is improved.However,thermal conductivity of diamond/Cu composites is reducing with the increase of volume fraction of Al,the formation of intermetallic compounds could hindered the effective interface of heat transfer due to increasing thermal resistance.The volume fraction of diamond and aluminum is designed to 2 vol.%and 75 vol.%,respectively,the highest thermal conductivity of sample reaches to 570 W/(m ? K).
出处
《真空与低温》
2015年第4期231-235,共5页
Vacuum and Cryogenics
关键词
热性能
金刚石/铜复合材料
镀钛层
thermal property
diamond/Cu composites
titanium coating
