High-silicon high-temperature titanium alloy and preparation method thereof

A high-temperature titanium alloy and high-silicon technology, which is applied in the field of high-silicon high-temperature titanium alloy and its preparation, can solve the problem that the service temperature of casting high-temperature titanium alloy is difficult to exceed 600°C, and achieve excellent high temperature, simple preparation method, and uniform and fine structure. Effect

Active Publication Date: 2020-05-19
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the problem that the service temperature of existing cast high-temperature titanium alloys is difficult to exceed 600°C, and provides a high-silicon high-temperature titanium alloy with excellent high-temperature and low-temperature mechanical properties and a low-cost preparation method thereof. The high-temperature titanium alloy can be used Applicable to temperatures above 600°C

Method used

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  • High-silicon high-temperature titanium alloy and preparation method thereof
  • High-silicon high-temperature titanium alloy and preparation method thereof
  • High-silicon high-temperature titanium alloy and preparation method thereof

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Embodiment 1

[0030] Using hydrodehydrogenated Ti powder, gas-atomized Al powder, Zr powder, Sn powder, Mo powder and Si powder as raw materials, the contents in terms of mass percentage are Al: 6%, Zr: 4%, Sn: 3.5%, Mo : 0.5%, Si: 0.6%, and the balance is Ti. Each powder was weighed, placed in a V-shaped mixer and fully mixed for 6 hours under the protection of argon with a rotation speed of 30 r / min. Fill the mixed powder to d30×300mm 3 In the cylindrical rubber tube, after vibration and compaction, the pressure was kept at 200MPa for 12 minutes for cold isostatic pressing to form a cylindrical compact. At 1300°C, the vacuum degree is higher than 1×10 -3Sintering under the condition of Pa for 2h, the specific process of sintering: room temperature → (90min) 750°C → (40min) 1000°C → (120min) 1350°C → (furnace cooling), to obtain sintered rods. Place the sintered bar in a resistance furnace and heat it to 950°C for 30 minutes. After rolling for multiple passes, it is made into an alloy p...

Embodiment 2

[0034] Using hydrogenated dehydrogenation Ti powder, gas-atomized Al powder, Zr powder, Sn powder, Mo powder and Si powder as raw materials, the contents in terms of mass percentage are Al: 5.4%, Zr: 3.8%, Sn: 4%, Mo : 0.7%, Si: 1.0%, and the balance is Ti. Weigh each powder, put it in a V-type mixer and mix it fully for 6 hours under the protection of argon, and the rotation speed is 30r / min. Fill the mixed powder to d30×300mm 3 In the cylindrical rubber tube, after vibrated and compacted, the pressure was kept at 230MPa for 10 minutes for cold isostatic pressing to form a cylindrical compact. At 1350°C, the vacuum degree is less than 1×10 -3 Sintering under the condition of Pa for 2h, the specific process of sintering: room temperature → (90min) 750°C → (30min) 1000°C → (120min) 1380°C → (furnace cooling) to obtain sintered rods. Place the sintered bar in a resistance furnace and heat it to 900°C for 30 minutes. After rolling for multiple passes, it is made into an alloy p...

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Abstract

The invention discloses a high-silicon high-temperature titanium alloy. The high-silicon high-temperature titanium alloy is prepared from the chemical compositions in percentage by mass: 0.4-1.2% of Si, 5.0-6.5% of Al, 3.5-6.5% of Zr, 3-5% of Sn, 0.3-1% of Mo and the balance of Ti. The preparation method comprises the steps: raw material powder is mixed sufficiently and evenly, the mixed powder issubjected to pressing formation to obtain a compact, the compact is sintered to obtain a sintered titanium alloy blank, the sintered titanium alloy blank is subjected to hot processing and annealed,and then the high-silicon high-temperature titanium alloy is obtained. Through combination of powder metallurgical treatment and high-temperature deformation, an even and small structure, dispersive distribution of a second phase, refinement and homogenization are achieved, the provided preparation method is simple and low in cost, an obtained high-temperature titanium alloy material has excellenthigh-temperature and low-temperature mechanical properties.

Description

technical field [0001] The invention relates to a high-silicon high-temperature titanium alloy and a preparation method thereof, belonging to the technical field of titanium alloy preparation. Background technique [0002] Due to the advantages of low density, high strength, high temperature resistance, and corrosion resistance, titanium alloys have been widely used in aerospace, automobiles, ships and other fields. High-temperature titanium alloy is one of the important development directions of titanium alloy, and it is an important standard to measure a country's titanium alloy research level and aviation technology development level. With the development of the aerospace industry, the demand for high-temperature titanium alloys with higher temperature resistance is also increasing. At present, the main problem limiting the development of high-temperature titanium alloys is that the creep resistance and high-temperature oxidation resistance at high temperatures are not e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/04C22F1/02C22F1/18B22F3/04B22F3/10B22F3/24
CPCB22F3/001B22F3/04B22F3/1007B22F3/24B22F2003/248B22F2998/10C22C1/0458C22C14/00C22F1/02C22F1/183B22F1/0003B22F2003/185
Inventor 刘彬郭锐刘咏
Owner CENT SOUTH UNIV
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