Method for purifying titanium material

Abstract

This method for purifying a titanium material is a deoxidization method for removing oxygen contained in a titanium material from the titanium material that is formed from pure titanium, a titanium alloy or an intermetallic compound that contains titanium as one of the main components. This method for purifying a titanium material comprises: a first melting step wherein hydrogen is introduced intothe titanium material in a molten state by melting the titanium material in a rare gas atmosphere containing 5-70% by volume of hydrogen; and a second melting step wherein oxygen contained in the titanium material is removed together with hydrogen from the titanium material in a molten state by melting the titanium material, into which hydrogen has been introduced during the first melting step, in a rare gas atmosphere. The first melting step and the second melting step are carried out one or more times, respectively.

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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