高熔点金属氢氩等离子弧纯化研究

High melting point metals are widely used in the fields of electronics, chemical industry, atomic energy, aerospace, weaponry, but they all contain a certain amount of gas impurity elements, metal and non-metallic impurity elements, as well as various physical "impurities" (crystal defects), the content of these impurities in a certain concentration will have a great impact on the physical and chemical properties of the material, so it is necessary to effectively purify high melting point metals. In this paper, Ar-H₂ plasma arc melting was used to purify the high melting point metal Zr. The purification effect was enhanced by the high reduction of hydrogen and the extremely high thermal conductivity of the hydrogen atoms in the ionization state, and the composition and content were determined. Element vapor pressure analysis and hardness measurement were completed. The results showed that Ar-H₂ plasma arc melting could effectively improve the purity of high melting point metal Zr and decrease the content of impurity elements, and with the increase of purity, the hardness decreased gradually, which accorded with the principle that the more pure metal was, the smaller the hardness was. Compared with the unpurified metal Zr (96.4%), the purity of the sample was 98.09% in pure argon, 98.18% in 5% hydrogen and 98.22% in 10% hydrogen, respectively. At 30 min, the purity of the sample reached 98.12% in pure argon gas. The purity of the sample in10% hydrogen was 98.21% and the purity of that in 5% hydrogen was 98.23%.