氘离子束轰击石墨引起化学腐蚀的实验进展

EXPERIMENTAL PROGRESS ON CHEMICAL EROSION OF GRAPHITE BOMBARDED BY DEUTERIUM ION BEAM

在ＳＭＦ－８００ 石墨第一壁化学腐蚀温度特性的实验研究基础上，进一步测试了Ｇ３ 石墨、ＳＭＦ－８００ 高纯石墨和硼化石墨，以及ＳｉＣ涂层等在１．３μＡ／３ｋｅＶ 氘离子束轰击下化学腐蚀的温度特性。从中优选出Ｃ２Ｂ１０Ｈ１２ 氦辉光放电法制取的ＳＭＦ－８００ 石墨硼化层，它具有最佳的抗化学腐蚀性能。其ＣＤ４ 产额较ＳＭＦ－８００ 高纯石墨的降低一个数量级以上，ＣＤ４ 产额峰值温度下移至６５０Ｋ附近。用小角度转动样品法，初步观察了氘离子束轰击下石墨释放ＣＤ４ 的角分布特性，为托卡马克先进偏滤器实验中确立ＣＤ４

A development study,based on the basic study of chemical sputtering of graphite bombarded by a deuterium ion beam,was carried out with fresh SMF 800 graphite,G3 graphite,SiC and boronized graphite,etc.The SMF 800 graphite boronized in situ in the HL 1M tokamak with carborane (C 2B 10 H 12 ) by helium glow discharge was selected as the best one for anti chemical erosion.It possesses a releasing rate of CD 4 which is one order of magnitude lower than that of SMF 800 graphite and a releasing peak temperature of CD 4 shifts to 650K.By rotating the graphite sample with a small angle,a profile of CD 4 releasing from the sample bombarded by a deuterium ion beam of 1.3μA/3keV was observed.With 45 o incidence of the beam from left side,the releasing CD 4 peak was positioned at the right side 1 o from the samples normal.The releasing rate of CD 4 at a 5 o deviation from the normal was decreased by 7% approximately,a change one order of magnitude faster than the cosine law.