Preparation method of aerospace grade molybdenum and aluminum alloy

Abstract

The invention relates to the material and metallurgy technology, in particular to a preparation method of an aerospace grade molybdenum and aluminum alloy. The preparation method is characterized in that by controlling vacuum electron beam smelting parameters, the reaction is kept within a reasonable speed range, and uniform distribution of the molybdenum element in the molybdenum and aluminum alloy is facilitated. By adding aluminum shot again before vacuum electron beam smelting, aluminum element losses caused by high temperature are counteracted under the condition of electron beam smelting, and the aluminum element content of the final product reaches a set value. The preparation method of the aerospace grade molybdenum and aluminum alloy has the beneficial effects that the molybdenum element in the produced molybdenum and aluminum alloy is uniform in distribution, the impurity element content is small, the aluminum element content is stable, and the requirement of the aerospace grade molybdenum and aluminum alloy is met.

Description

technical field [0001] The invention relates to materials and metallurgical technology, in particular to a preparation method of aerospace-grade molybdenum-aluminum alloy. Background technique [0002] Molybdenum-aluminum alloy is an essential intermediate alloy for the preparation of high-temperature and high-strength titanium alloy materials. Its quality directly affects the comprehensive properties of titanium alloy materials. In recent years, the application of titanium alloy materials in aerospace, petrochemical, shipbuilding and other fields has gradually expanded. A country's titanium alloy material preparation level has become an important manifestation of a country's comprehensive national strength. [0003] The traditional process of molybdenum-aluminum alloy is the aluminothermic method, that is, aluminum powder is used to reduce molybdenum trioxide to prepare molybdenum-aluminum alloy. This process has the following disadvantages: [0004] 1. The reduction re...

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Problems solved by technology

The melting point and density of this content of molybdenum-aluminum alloy greatly exceed the melting point and density of the titanium matrix, which is likely to cause fatal defects such as inclusions and segregation of titanium alloy materials.

[0005] 2. The reaction is carried out in an atmospheric environment, and impurities such as oxygen, nitrogen, hydrogen, carbon, iron, phosphorus, and sulfur are easily mixed in the reaction

However, there are also certain technical defects in the vacuum induction melting process.

[0007] 3. The vacuum smelting temperature is lower than 2000°C, and some substances with high melting points cannot be fully melted, which further affects the impurity content in molybdenum-aluminum alloys

[0008] 4. Under high-temperature vacuum smelting, the aluminum element will produce a large loss, which will cause the element ratio of the final alloy material to deviate from the set value, which will greatly affect the properties of the material, and at the same time, it will be unfavorable to the uniformity of the molybdenum element in the material Impact

The current production process usually does not set requirements on the content of aluminum elements, resulting in high and low content, and even the content of aluminum elements in the same batch of products is also uneven, seriously affecting further processing and use

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