Refining method of titanium raw material

Abstract

The refining method of the titanium raw material of the present invention is a deoxidation method for removing oxygen contained in the titanium raw material from a titanium raw material containing pure titanium, a titanium alloy, or an intermetallic compound containing titanium as one of the main components. It has: the first smelting process, the titanium raw material is melted under the rare gas atmosphere containing 5-70 volume % of hydrogen, and hydrogen is introduced into the melt of the titanium raw material; the second smelting process is made through the first smelting process. The hydrogen-introduced titanium raw material is melted in a rare gas atmosphere, oxygen contained in the titanium raw material is removed from the melt of the titanium raw material together with hydrogen, and the first smelting process and the second smelting process are each carried out at least once.

Description

technical field [0001] The present invention relates to a refining method for titanium raw materials containing pure titanium, titanium alloys, or intermetallic compounds containing titanium as one of the main components, removing oxygen contained in the titanium raw materials, and then removing hydrogen . Background technique [0002] In recent years, the demand for titanium such as pure titanium and titanium alloys has increased especially as a metal raw material for aircraft, automobiles and other means of transportation, taking advantage of characteristics such as light weight, high corrosion resistance, and high specific strength. [0003] Titanium is also called an active metal because it is active, and it is very easy to combine with light elements such as oxygen and nitrogen. Once it is combined with these light elements, it is very difficult to remove. As mentioned above, titanium has excellent characteristics, but it has the problem that it is difficult to remove ...

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Problems solved by technology

[0013] However, although it is described in Non-Patent Document 1 that the ICP analysis method is used as an oxygen analysis method, it does not describe the specific experimental conditions under which the data was obtained.

Generally, in the ICP analysis method, it is difficult to accurately analyze the oxygen concentration in the sample due to the presence of oxygen atoms contained in the water molecules used to prepare the solution for quantitative analysis.

[0014] In addition, non-patent literature 2 also describes a graph showing the time-dependent change of the oxygen concentration in the sample, and it is difficult to expect the above-mentioned oxygen reduction effect due to the inclination of the described graph.

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