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用化学镀法和粉末冶金的方法制备高致密的W/Cu梯度热沉材料。用场发射扫描电镜观察了材料的组织结构、界面和断口形貌。对材料的力学性能也进行了表征,如抗弯强度和显微硬度。结果表明材料每一层都很致密且组织结构均匀。截面上材料成分呈梯度分布,每层之间没有明显的界面。3层W/Cu梯度热沉材料的相对密度可达99.2%。散热层、过渡层和封接层的显微硬度HV分别是2000、2100和2400 MPa。抗弯实验结果显示封接层和散热层作为承重抗弯表面时的强度分别是428.5和480.7 MPa。
Preparation of high density W / Cu gradient heat sink material by electroless plating and powder metallurgy. The field emission scanning electron microscope was used to observe the microstructure, interface and fracture morphology of the material. The mechanical properties of the material were also characterized, such as flexural strength and microhardness. The results show that each layer of the material is very dense and uniform in structure. The material composition of the section is gradient distribution, there is no obvious interface between each layer. The relative density of 3-layer W / Cu gradient heat sink material can reach 99.2%. The microhardness HV of the heat sink, transition layer and sealing layer are 2000, 2100 and 2400 MPa, respectively. The bending test results show that the strength of the sealing layer and the cooling layer as load-bearing bending surface are 428.5 and 480.7 MPa respectively.