HT-7U装置第一壁抗热冲击SiC厚膜涂层研究

STUDY ON THICK SiC COATINGS WITH THERMAL SHOCK RESISTANCE ON THE FIRST WALL OF HT-7U DEVICE

为实现 HT－ 7U装置长脉冲运行的物理目标，在碳石墨第一壁材料的改性研究中和为保证在稳定的长平顶阶段对大部分杂质和再循环的控制，提出了研制抗等离子体溅射腐蚀的梯度功能涂层的概念。研究了通过化学气相转化 CVR和化学气相渗透 CVI 2种技术实现 SiC厚膜梯度涂层的方法，通过实验研究发现 CVI法实现的 SiC涂层有更厚、更致密、更好的梯度性和很好的抗热冲击等综合性能，适于作为 HT－ 7U装置第一壁高通量部件上的保护涂层。

In order to get the physical objective of the long pulse operation in HT 7U device, in the research of the doped graphite and in the control for most impurities and recycling in the steady state of the long flat period, a concept of developing functionally gradient coatings with the good sputtering resistance was presented . The methods of thick SiC gradient coatings by CVR and CVI are studied, SiC coatings by CVI are found thicker, morecompact， better gradient and good thermal shock resistance,which is adaptable to protective coatings on the high heat flux components of HT 7U device.