Hydrogenation and dehydrogenation furnace and preparation method of low-oxygen-content titanium powder

Abstract

The invention provides a hydrogenation and dehydrogenation furnace. The hydrogenation and dehydrogenation furnace comprises a heating furnace horizontally placed, a reactor, and a gas storage tank, wherein the heating furnace comprises a first heating furnace and a second heating furnace; the reactor comprises a first reactor and a second reactor; thermocouples are arranged on the heating furnace; the first reactor and the second reactor are both cylinders with two closed ends; material ports are formed in one ends of the cylinders; sealing covers are arranged onthe material ports; water cooling sleeves are arranged on the cylinders near the sealing covers; gas ports are formed in the cylinders; a pressure gauge, a reactor joint, a vacuumizing joint and a hydrogen source joint are arranged on the gas storage tank; reaction part sections of the first reactor and the second reactor are respectively positioned in hearths of the first heating furnace and the second heating furnace; and the reactor joint of the gas storage tank is respectively communicated with the gas ports of the first reactor and the second reactor through pipe fittings. The invention further provides a preparation method of low-oxygen-content titanium powder; and the oxygen content of titanium powder prepared by the method is not more than 0.15 wt%.

Description

technical field [0001] The invention belongs to the production field of hydrogenation dehydrogenation process of titanium powder, and relates to a hydrogenation dehydrogenation furnace and a preparation method of titanium powder with low oxygen content. Background technique [0002] Titanium powder is an important raw material for preparing titanium alloys. The mechanical properties of titanium alloys decrease significantly with the increase of oxygen content. For example, for titanium alloy TC4, when the oxygen content exceeds 0.3%, its elongation after fracture will decrease. If it is lower than 8%, when the oxygen content in it reaches 1%, its elongation after breaking will be lower than 1%, and TC4 will be brittle at this time. Since the oxygen content of powder metallurgy sintered products is generally higher than that of the original powder matrix, the application of titanium powder produced by the existing hydrogenation dehydrogenation process in the field of powder m...

AI Technical Summary

Problems solved by technology

Since the hydrogenation reaction is carried out at a high temperature of 400-500 ° C, and the hydrogen absorption capacity of sponge titanium is extremely large, and under high temperature conditions, the solid solution of oxygen in sponge titanium and the oxidation of sponge titanium will increase sharply. As a hydrogen source, but it inevitably contains oxygen, the hydrogenation process will cause a large amount of oxygen in the hydrogen source and gas path to be enriched in the sponge titanium; at the same time, during the hydrogenation reaction, the sudden change in the phase transition volume of titanium and the The embrittlement of the material will cause cracks on the material, which will cause a sharp increase in the surface area of ​​the material, which also increases the probability of the material being polluted by impurity oxygen

The above factors will cause the purity of the final product titanium powder to decrease. In addition, the raw material sponge titanium itself is polluted by oxygen, and the grinding process is polluted by oxygen. The oxygen content of the titanium powder prepared by the existing hydrodehydrogenation process is usually higher than 0.3wt%.

[0005] In order to solve the problem of oxygen pollution, some researchers have proposed to operate all the steps of the hydrodehydrogenation process under a protective atmosphere or to carry out integrated operations under a protective atmosphere to reduce the oxygen-increasing link, but this method will lead to high production costs , and cannot fundamentally solve the problem of oxygen pollution during high-temperature hydrogenation of sponge titanium, so the control effect of this type of method on the oxygen content in titanium powder is relatively limited

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