4SiO4小球與ODS鋼的化學(xué)相容性對(duì)聚變反應(yīng)器的安全運(yùn)行具有重要意義。研究了在500、600、700 ℃的氬氣環(huán)境中保溫300 h后ODS鋼與小球接觸界面組織和成分的變化。結(jié)果表明，在600~700 ℃時(shí)，Li4SiO4小球與ODS鋼的界面發(fā)生了嚴(yán)重的元素互擴(kuò)散和反應(yīng)。在Li4SiO4小球表面，由于ODS鋼中Fe和Cr的擴(kuò)散，出現(xiàn)了一層薄薄的反應(yīng)層，這也導(dǎo)致了密度的增加，破碎負(fù)荷從51 N （500 ℃）下降到32 N（700 ℃）。XRD圖譜顯示，ODS鋼表面出現(xiàn)了LiCrO2和LiFeO2新相，說(shuō)明Li4SiO4小球中的Li和O原子可以擴(kuò)散到ODS中，與Fe、Cr元素在高溫下發(fā)生反應(yīng)形成腐蝕層。在700 ℃時(shí)，腐蝕層可分為2個(gè)氧化層。最外層是LiFeO2和LiCrO2的混合物，下一層主要是LiFeO2。在ODS鋼的表面，700 ℃/300 h條件下氧擴(kuò)散系數(shù)為2.2×10-14 cm2/s，這說(shuō)明ODS鋼作為一種包層結(jié)構(gòu)材料，在未來(lái)的包層設(shè)計(jì)中需要一層耐腐蝕涂層。;The chemical compatibility between Li4SiO4 pebbles and ODS steel is important for the safe operation of the fusion reactor. In the present paper, the transformation of microstructure and component for contact interface between ODS steel and pebbles after 300 h heat preservation in an argon atmosphere at 500, 600, and 700 °C was investigated. The results show that serious element interdiffusion and reaction can be observed at the interface between Li4SiO4 pebbles and ODS steel at temperatures of 600~700 °C. For the surface of Li4SiO4 pebbles, a thin reaction layer appears due to the diffusion of Fe and Cr from ODS steel, which also causes the increase of density and decrease of crush load from 51 N (500 °C) to 32 N (700 °C). XRD patterns show that the new phase of LiCrO2 and LiFeO2 appears on the surface of ODS steel, which suggests that the Li and O atoms in Li4SiO4 pebbles can diffuse into ODS, and react with Fe and Cr elements to form corrosion layers at high temperature. The corrosion layers can be divided into two oxide sub-layers at 700 °C. The outermost layer is a mixture of LiFeO2 and LiCrO2, and the next layer is mainly LiFeO2. For the surface of ODS steel, the oxygen diffusion coefficient is 2.2×10-14 cm2/s at 700 °C for 300 h. It suggests that the ODS steel as a blanket structure material steel needs a resisted corrosion coating in the design of a blanket in the future."/>
4SiO4微球;氚增殖包殼;兼容性;腐蝕;ODS steel;Li4SiO4 pebbles;tritium breeder blanket;compatibility;corrosion"/>