烧结钽棒提纯工艺研究

Study on Purification Process of Sintered Tantalum Rod

对烧结钽棒提纯工艺进行研究,结果表明钽棒等静压成型用包套会造成成型钽棒表面污染,导致碳元素含量增加,钽棒成型选用裂解温度较低的乳胶包套较橡胶包套可以有效降低烧结后钽棒碳元素的残留。高温烧结,能够除去部分残留的杂质,但要完全除尽十分困难。采用HNO_(3)+HF体系酸洗的方式可以有效地去除钽棒表面的夹杂物,达到钽棒提纯的效果。

The purification process of the sintered tantalum rod is studied,and the results show that sheath for the molding of tantalum rod contributes to the surface contamination,which leads to the increase of C content.The latex sheath with low cracking temperature can effectively reduce the residual C compared with the rubber sheath.High temperature sintering can remove part of the residual impurities,but to completely remove them is very difficult.The HNO_(3) + HF acid system can effectively remove the inclusion in the surface of the tantalum rod and achieve the purification of the tantalum rod.