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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 realize the physical target of HT-7U long pulse operation, in the modification of carbon graphite first wall material and in order to ensure the control of most impurities and recirculation in the stable long-flat stage, Volumetric sputter corrosion gradient concept of functional coating. The method of realizing gradient coating of SiC thick film by two technologies of chemical vapor phase transformation (CVR) and chemical vapor infiltration (CVI) was studied. The experimental results show that the SiC coating obtained by CVI method is thicker, denser and better gradient Good thermal shock resistance and other comprehensive performance, suitable as HT-7U device first wall high-throughput components on the protective coating.