摘要
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。
W-Cu plasma facing gradient heat sink material was fabricated by the powder metallurgy technique. The microstructure and thermomechanical properties of W-Cu gradient material were studied. The composition has a graded distribution in the cross- section. The microstructure around the interface changes continually through element diffusion at high temperature. And there is no obvious interface between different layers. After sintering, the copper forms a continuous network structure and distributes in the surrounding of tungsten particles. The chemical element distribution and thermomechanical properties of the W-Cu gradient material have a graded distribution across the thickness. And its whole thermal conductivity is 151.4 W· （m·K）^-1. The thermal shock and thermal cycle tests were conducted on the material under the condition of cooling temperature difference 800 ℃. After the thermal shock test, no cracks were found at the interface. Cracks were observed after 83 thermal cycle tests, and the mechanism of crack formation was discussed.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2008年第2期25-30,共6页
Acta Materiae Compositae Sinica
基金
安徽省自然科学基金资助项目(070414180)
中国科学院等离子体物理研究所合作项目(103-413361)
合肥工业大学科技创新基金资助项目(103-037016)
