采用粉末冶金法制备了W-Cu面对等离子体梯度热沉材料.对其显微组织、界面以及重要的热学、力学性能进行了研究.显微组织观察表明:截面成分呈梯度分布,并通过高温下元素的扩散,实现了组织的连续变化,层间没有明显界面;烧结后Cu形成了连续的网络结构,分布在W颗粒周围.W-Cu梯度材料的化学元素分布和热学、力学性能沿厚度方向呈梯度变化,材料整体的热导率达151.4 W·(m·K)<'1-.在800℃温差条件下,对材料分别进行抗热震和耐热疲劳实验.热震实验后,界面处未发现裂纹和开裂现象,表现出良好的抗热震性能.经过83次热循环冲击后,观察到了裂缝,并探讨了裂缝形成机制.
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