聚变堆面向等离子体SiC/Cu梯度材料的制备与评价

Processing and Evaluation of Graded SiC/Cu Facing Plasma Composite

用超高压梯度烧结法制备出了成分分布从０～１００％的接近理论密度的ＳｉＣ／Ｃｕ聚变堆 面向等离子体功能梯度材料．化学溅射实验表明其ＣＤ４产额与二次纯化石墨相比降低了８０％； 热解吸放气率约为石墨的１０％；在３９８ＭＷ／ｍ２的激光热冲击下，材料表面出现疲劳裂纹和化学 分解现象；原位等离子体辐照结果显示陶瓷材料表面出现一定程度的溅射损伤．

A near dense graded SiC/Cu plasma facing material with a spectrum of 0-100% compositional distributions of SiC was successfully prepared by a new process termed graded sintering under ultra-high pres- sure. Tests on plasma relevant performances showed that the chemical sputtering CD4 yield of SiC/Cu graded composite is 80% lower than that of SMF-800 nuclear graphite, while its thermal desorption is about 10% of that graphite; Fatigue cracks and chemical decomposition were found on the surface of SiC/Cu FGM after 300 cycles of thermal impact with a power of 398 MW/m2 laser impulse, slight damage was also observed on the material surface after in-situ plasma trradiation in Tokamak apparatus.