Tritium permeation is an essential challenge that should be solved in fusion reactors. In this study, the inner wall SiO₂ coating of the 316L stainless steel pipeline for tritium permeation barrier (TPB) is prepared by slurry-spraying method. The microstructure, phase composition, thermal shock resistance, and hydrogen permeation resistance of the SiO₂ coating are investigated. Results show that the coating is amorphous SiO₂, and the coating is bonded well to the substrate and the thickness of the coating is about 10–15 μm. After six thermal shock treatments, the SiO₂ coating exhibit good thermal shock resistance stability below 700 °C. Results from the hydrogen penetration test indicate that the hydrogen resistance capability of the SiO₂ coating is 16-fold higher than that of the 316L stainless steel substrate. Hydrogen resistance is also 6-fold more stable than that of 316L stainless steel. These characteristics improve significantly the hydrogen resistance performance of the 316L stainless steel substrate.

fusion渗透是聚变反应堆应解决的重要挑战。本研究采用浆液喷涂的方法制备了316L不锈钢pipeline气渗透阻挡层（TPB）内壁SiO ₂涂层。研究了SiO ₂涂层的微观结构，相组成，耐热冲击性和耐氢渗透性。结果表明，该涂层为无定形SiO ₂，并且涂层与基材的粘合力很好，涂层的厚度约为10–15μm。经过六次热冲击处理后，SiO ₂低于700°C时，涂层表现出良好的抗热震稳定性。氢渗透测试的结果表明，SiO ₂涂层的抗氢性能比316L不锈钢基材高16倍。耐氢性也比316L不锈钢高6倍。这些特性显着改善了316L不锈钢基板的耐氢性能。