自包裹型铜/因瓦类合金复合材料的设计、制备技术及其热物理性能研究

本项目以设计和制备一体化为主要学术思想，研究自包裹型铜/因瓦类合金复合粉体材料的成分设计、组织控制、制备技术及其烧结体材料的热物理性能。基于本研究中实验测定的相平衡结果与文献报道的相图信息，建立Cu-Fe-Co-Ni-Cr-Nb-Mo多元合金的热力学数据库。通过计算相图有效地预测稳定液相分离存在的成分和温度范围，并考虑因瓦合金对成分的要求，设计自包裹型铜/因瓦类合金复合粉体的合金成分。在此基础上，利用雾化制粉技术，制备铜/因瓦类合金复合粉体材料，并考察合金成分、液相的体积分数、熔炼温度、凝固速度等工艺参数对凝固组织形态的影响，确定制备该类复合粉体材料的最佳工艺。并结合热压烧结技术，研究不同体系的自包裹型铜/因瓦类合金复合粉烧结体材料的热膨胀性能和导热性能，探索利用液相分离制备低膨胀高导热铜/因瓦类合金复合材料的工艺条件，为该类复合材料的研发提供技术积累。

This project, based on the main academic thinking of the integration of design and experiment, studies the compositional design, morphology control, preparation techniques and thermo-physical properties of its sintered alloys of self-organized Cu/Invar alloy composite powders. Based on the experimental data of the phase equilibria in this study and the related information of phase diagrams in the literatures, the thermodynamic database of Cu-Fe-Co-Ni-Cr-Nb-Mo multi-component system will be established. By considering the requirement for the composition of Invar alloy, self-organized Cu/Invar alloy composite powders will be designed based on the composition and temperature ranges of stable miscibility gap of liquid phase obtained from the calculated phase diagrams. Afterwards, self-organized Cu/Invar alloy composite powders will be prepared by the gas atomization. With investigating the effect of the processing parameters such as the alloy composition, liquid volume fraction, melting temperature and solidification rate on the morphology of solidification，the optimum preparative process will be determined. By combining with hot pressing sintering technology, we will investigate the properties of thermal expansion and thermal conductivity of the sintered composite materials made of self-organized Cu/Invar alloy composite powders in different alloy systems，and explore the best preparative process conditions of the Cu/Invar alloy composite materials with the properties of low expansion and high thermal conductivity. This study will provide technical reserves for the development of such composites in some alloy systems with liquid phase separation.