Method for smelting hydrogen storage alloy containing titanium from BaZrO3 refractory material by vacuum induction

Abstract

The invention discloses a method for smelting hydrogen storage alloy containing titanium from a BaZrO3 refractory material by vacuum induction. The method comprises the steps of using a crucible of the high-stability BaZrO3 refractory material, taking pure metal forming the hydrogen storage alloy containing titanium as the material, preparing the hydrogen storage alloy containing titanium by adopting a vacuum induction smelting process and by taking inert gases as protective gases or under a vacuum condition; measuring the smelting temperature with an infrared thermometer; controlling the temperature increase rate of smelting and keeping at 1-50 DEG C per minute by adjusting the power of a vacuum induction furnace, and controlling the smelting temperature, and keeping the smelting temperature 1-150 DEG C higher than the melting point of the hydrogen storage alloy containing titanium and the smelting time at 5-120min. The hydrogen storage alloy containing titanium smelted by the method is low in oxygen content in the alloy, easy to activate and strong in hydrogen absorption capacity by related detection; the alloying component is effectively controlled, and the hydrogen is absorbed and released at room temperature.

Description

technical field [0001] The present invention relates to a kind of BaZrO 3 The invention discloses a method for vacuum induction smelting a titanium-containing hydrogen storage alloy of a refractory material, belonging to the technical field of vacuum metallurgy smelting. technical background [0002] Hydrogen storage alloys are composed of elements A (such as La, Zr, Mg, V, Ti, etc.) that are easy to form stable hydrides and other elements B (such as Cr, Mn, Fe, Co, Ni, Cu, Zn, Al, etc.) An intermetallic compound that reacts with hydrogen to form a metal hydride and reversibly releases hydrogen under appropriate conditions. At present, the hydrogen storage alloys that have reached industrial practical value mainly include rare earth series (AB 5 type), Laves phase series (AB 2 type), magnesium series (A 2 B type) and titanium series (AB type) four series. [0003] AB-type titanium-based hydrogen storage alloys mainly refer to TiFe, TiCr, TiV and multi-element alloys bas...

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Problems solved by technology

However, the water-cooled copper crucible takes away a lot of heat, seriously wastes energy, and causes uneven thermal field, which makes the structure of titanium-based hydrogen storage alloy uneven and affects its performance; while using graphite crucible as a melting vessel for titanium-based alloys will make titanium The ingots of hydrogen storage alloy alloys are seriously increased in carbon, and large-scale brittle layers are formed, thereby reducing the hydrogen storage performance of titanium-based hydrogen storage alloys and promoting their use. It is necessary to find a new method for melting titanium-containing hydrogen storage alloys

[0005] At present, based on reducing energy consumption and saving costs, oxide refractory crucibles can be used as melting vessels for titanium-containing alloys. However, in the high-temperature molten state, titanium has high chemical activity. Common oxide refractory materials, such as Al 2 o 3 , MgO, SiO 2 , ZrO 2 etc. will react violently with Ti liquid at high temperature, so these common refractories, such as magnesia, alumina and silicon oxide, are not suitable for use as reaction vessels for smelting titanium-containing alloys, and thermodynamic calculations show that in BaO-ZrO 2 The binary phase diagram of BaZrO 3 It is a refractory compound with a melting point as high as 2600 ° C. It is a compound with stable thermodynamic properties. It can be used as a high-temperature solid electrolyte, high-temperature structural ceramics and refractory materials. It has good thermal shock resistance, cubic perovskite structure, and a density of 5.562 g / cm 3 and cheap

At present, BaZrO 3 Research on refractory materials has been carried out, and it has been used as a raw material for preparing reaction vessels in some smelting as a refractory material. For example, it has been reported that it is currently a high-quality single-crystal yttrium-barium-copper-oxygen superconducting material in smelting. The most stable crucible material, this new type of refractory material has the following advantages when used in yttrium-barium-copper-oxygen superconducting materials: the single crystal after smelting does not contain impurity elements from the crucible; No longer affects the composition of the molten alloy, which can overcome the product generated by the reaction of the crucible material with the alloy melt, but the BaZrO 3 The application of refractories for the smelting of titanium-containing hydrogen storage alloys has not been widely developed, so the present invention attempts to use highly stable BaZrO 3 Refractory Crucible and Vacuum Induction Furnace for Melting Titanium-containing Hydrogen Storage Alloys

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