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Al-Mo-Cr-Sn-Nb-Zr intermediate alloy and preparation method thereof

A technology of aluminum molybdenum chromium tin niobium and master alloy, which is applied in the field of metal materials, can solve the problems of high content of molybdenum and vanadium elements, difficulty in mixing raw materials, and large difference in melting point, so as to achieve uniform alloy composition, small segregation, and high composition Uniform and stable effect

Inactive Publication Date: 2017-05-31
CHENGDE TIANDA VANADIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in order to reduce the melting temperature, the intermediate alloy generally used in the smelting of TC21 titanium alloy is a binary alloy. The aluminum content in the alloy is low, the content of molybdenum and vanadium elements is high, and material defects such as molybdenum segregation and molybdenum inclusions, and the production process requires precise ingredients, the process is complicated, and it is easily affected by human factors and various factors in the production process

Method used

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preparation example Construction

[0022] The present invention also provides a method for preparing an aluminum-molybdenum-chromium-tin-niobium-zirconium master alloy described in the above technical solution, comprising: using aluminum as a reducing agent, molybdenum trioxide, chromium trioxide, tin dioxide, niobium pentoxide And zirconium dioxide as oxidant, smelting to obtain aluminum molybdenum chromium tin niobium zirconium master alloy. In the present invention, the morphology of the aluminum, molybdenum trioxide, chromium trioxide, tin dioxide, niobium pentoxide and zirconium dioxide is preferably powder; the particle size of the powder is preferably independently 80 -120 mesh, more preferably independently 90-110 mesh.

[0023] In the present invention, the mass ratio of the aluminum, molybdenum trioxide, chromium trioxide, tin dioxide, niobium pentoxide and zirconium dioxide is preferably (1.625~1.835):(0.825~1.115):(0.455~ 0.655):(0.465~0.755):(0.565~0.710):(0.825~1.015), more preferably (1.7~1.8):(...

Embodiment 1

[0036] 1. Dry aluminum powder with a particle size of 100 mesh, molybdenum trioxide, chromium trioxide, tin dioxide, niobium pentoxide and zirconium dioxide. Drying temperature: 100°C, drying time: 12 hours.

[0037] 2. Calculate the alloy ratio: molybdenum trioxide 0.825kg, chromium trioxide 0.455kg, tin dioxide 0.465kg, niobium pentoxide 0.565kg, zirconium dioxide 0.825kg, aluminum 1.625kg.

[0038] 3. Put the raw materials into the mixer and mix them at a rate of 120r / min for 4 minutes. Mixing requirements: each raw material must be fully mixed evenly to ensure sufficient contact between raw materials.

[0039] 4. Preheat to a furnace temperature of 41°C, ignite and smelt. After ignition, the sparks are more than 30 cm high, the reaction is violent, and the reaction time is 45 seconds. After 24 hours, it is released from the furnace to obtain an aluminum molybdenum chromium tin niobium zirconium master alloy.

[0040] The chemical composition of the aluminum molybdenum chro...

Embodiment 2

[0043] 1. Dry aluminum powder with a particle size of 120 mesh, molybdenum trioxide, chromium trioxide, tin dioxide, niobium pentoxide and zirconium dioxide. Drying temperature: 120°C, drying time: 10 hours.

[0044] 2. Calculate the alloy ratio: molybdenum trioxide 0.915kg, chromium trioxide 0.511kg, tin dioxide 0.535kg, niobium pentoxide 0.632kg, zirconium dioxide 0.835kg, aluminum 1.665kg.

[0045] 3. Put the raw materials into the mixer and mix them at a rate of 120r / min for 4 minutes. Mixing requirements: each raw material must be fully mixed evenly to ensure sufficient contact between raw materials.

[0046] 4. Preheat to the furnace temperature of 40°C, ignite and smelt, and emit gray smoke after ignition. The flame is about 30 cm higher than the furnace cover, and the reaction time is 42 seconds. After 24 hours, it is released from the furnace to obtain an aluminum molybdenum chromium tin niobium zirconium master alloy.

[0047] The chemical composition of the aluminum...

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Abstract

The invention provides an Al-Mo-Cr-Sn-Nb-Zr intermediate alloy and a preparation method thereof. The Al-Mo-Cr-Sn-Nb-Zr intermediate alloy comprises the following components by mass: 20.0-22.0% of Mo, 11.0-13.0% of Cr, 14.0-16.0% of Sn, 14.0-16.0% of Nb, 15.0-17.0% of Zr and the balance of Al. According to design of the alloy components, the Al-Mo-Cr-Sn-Nb-Zr intermediate alloy has small composition segregation, and is conductive to homogenizing of the alloy components when replacing binary alloy for alloy smelting of TC21 titanium alloy to prevent composition segregation, so that the compounding procedure of TC21 titanium alloy smelting is simplified. Experimental results show that the Al-Mo-Cr-Sn-Nb-Zr intermediate alloy is uniform and stable in component and small in segregation. The preparation method is simple, easy to control and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to an aluminum-molybdenum-chromium-tin-niobium-zirconium master alloy and a preparation method thereof. Background technique [0002] Titanium and its alloys have excellent properties, such as high specific strength, corrosion resistance, high temperature resistance and good comprehensive process performance, etc., and are increasingly becoming eye-catching materials in the field of modern industrial science and technology. It has been widely used in many fields such as chemical industry, light industry, metallurgy, machinery and energy. [0003] The nominal composition of TC21 titanium alloy is Ti-6Al-2Zr-2Sn-2Mo-1.5Cr-2Nb, which is a high-strength, high-toughness, high damage-tolerant titanium alloy with good strength, plasticity, fracture toughness and low The crack growth rate can be used in the wing joint structural parts of aviation aircraft, the fuselage and landing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/04C22C1/02C22C1/03C22C14/00
CPCC22C1/02C22C1/03C22C14/00C22C21/003C22C27/04C22C30/04
Inventor 王志军刘建丰乔敏刘强胡利志
Owner CHENGDE TIANDA VANADIUM IND
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