Preparation method of titanium-molybdenum alloy

Abstract

The invention discloses a preparation method of a titanium-molybdenum alloy. The method comprises the steps that Ti powder and Mo powder are taken as raw materials, powder mixing, isostatic pressing and sintering are sequentially carried out through a powder metallurgy method, and a Ti-Mo intermediate alloy is prepared, wherein, when powder mixing is carried out through the powder metallurgy method, manual powder mixing and mechanical powder mixing are sequentially carried out, manually powder mixing is carried out for 3-6 times, and mechanical powder mixing is carried out for 2-4 hours, and during vacuum sintering, the sintering temperature is 1100-1300 DEG C, and heat preservation is carried out for 2-4 hours; the Ti-Mo intermediate alloy and titanium sponges are pressed to obtain electrode blocks, and the electrode blocks are assembled and welded into a consumable electrode, wherein the titanium sponges are 0-grade or 1-grade titanium sponge particles; and vacuum consumable smeltingis carried out on the consumable electrode for at least three times, the vacuum degree is lower than 10 <-1> Pa in each vacuum consumable smelting process, and a Ti-Mo alloy ingot is obtained. According to the preparation method, the titanium-molybdenum alloy with uniform structure components is prepared by combining a powder metallurgy method and an alloy smelting method.

Description

【Technical field】 [0001] The invention belongs to the technical field of titanium material processing, and in particular relates to a preparation method of a titanium-molybdenum alloy. 【Background technique】 [0002] Molybdenum-titanium alloy is an alloy composed of molybdenum as the base and a small amount of titanium. The preparation of titanium alloy generally adopts the method of vacuum consumable remelting, which needs to suppress the consumable electrode. The raw material of metal molybdenum in the consumable electrode is molybdenum bar or molybdenum powder. [0003] When molybdenum strips are used, metal molybdenum is a refractory metal with a melting point as high as 2622±10°C, which is about 1000°C higher than that of titanium, and a density of 10.22g / cm 3 , is about 2.3 times that of metal titanium, so it is difficult for Mo to melt with Ti at the same time during the smelting process, Ti will melt first, Mo in the consumable electrode will lose the clamping of su...

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Problems solved by technology

[0003] When molybdenum strips are used, metal molybdenum is a refractory metal with a melting point as high as 2622±10°C, which is about 1000°C higher than that of titanium, and a density of 10.22g / cm 3 , is about 2.3 times that of metal titanium, so it is difficult for Mo to melt with Ti at the same time during the smelting process, Ti will melt first, Mo in the consumable electrode will lose the clamping of surrounding Ti, and will fall into the molten pool, and then appear The non-melting mass of Mo is easy to cause tissue segregation

[0004] When molybdenum powder is used, it is difficult to mix molybdenum powder and spongy Ti evenly, especially when the content of Mo in the alloy is high, it is more difficult to mix evenly with spongy Ti due to the large volume of Mo powder

Moreover, in the mixing process, there is still a certain degree of material loss, which will also affect the preparation of qualified ingots

Moreover, in industrial production, the preparation method usually used for Ti-Mo alloys with higher Mo content is to melt metal molybdenum into ingots in advance, process shaped materials, and weld them with sponge titanium in an appropriate way to form consumable electrodes, and then Vacuum self-consumption melting to obtain Ti-Mo alloy has the problems of complex process, long production cycle and high cost

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