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A kind of preparation method of directionally solidified high niobium titanium aluminum base alloy

A technology of directional solidification and high-niobium titanium-aluminum, applied in the field of metal material preparation, can solve problems such as directional solidification of titanium-aluminum-based alloys with high niobium content that have not been studied before, achieve universal applicability and promotion value, reduce impurity content, and simple equipment Effect

Active Publication Date: 2011-12-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foreign countries have focused on the preparation of small-sized directional solidification samples of ordinary titanium-aluminum-based alloys, mainly using the optical levitation directional solidification technology and yttrium oxide crucible to explore the effect of the titanium-aluminum peritectic reaction solidification pathway on the growth morphology of the constituent phases. and orientation, but the directional solidification of titanium-aluminum-based alloys with high niobium content has not been studied

Method used

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  • A kind of preparation method of directionally solidified high niobium titanium aluminum base alloy
  • A kind of preparation method of directionally solidified high niobium titanium aluminum base alloy
  • A kind of preparation method of directionally solidified high niobium titanium aluminum base alloy

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Effect test

Embodiment 1

[0030] Grind the surface of a cylindrical (Φ6×100mm) master alloy rod sample with a composition of 45Ti-45Al-9Nb-0.5W-0.25B-0.25Y (atomic percentage) to remove the oxide layer and impurities on the surface, and then put it into the coating In a high-purity alumina crucible with a size of Φ6×120 mm after the layer, the volume percentage of the coating composition is: 90% yttrium oxide + 3% sodium phosphate + 7% bentonite. Place the crucible upright on the base of the drawing rod in the melting and directional solidification system in the improved area, close the vacuum chamber and evacuate to 3×10 -3 After Pa, fill in high-purity argon to 380Pa; turn on the power, heat the alloy to 1950K at a heating rate of 18K / min and keep it warm for 15 minutes to ensure that the melt is fully melted and heated evenly; set the orientation in the PLC control panel The solidification speed is 100μm / s, keep the power supply constant and start pulling; after the sample is stretched 100mm, turn o...

Embodiment 2

[0032] Grind the surface of a cylindrical (Φ10×100mm) master alloy rod sample with a composition of 44.5Ti-46Al-8.5Nb-0.5Mn-0.25B-0.25Y (atomic percentage) to remove the oxide layer and impurities on the surface, and then install After being put into a high-purity alumina crucible with a size of Φ10×120 mm after coating, the volume percentage of the coating composition is: 87% yttrium oxide+3% sodium phosphate+10% bentonite. Place the crucible upright on the base of the drawing rod in the melting and directional solidification system in the improved area, close the vacuum chamber and evacuate to 3×10 -3 After Pa, refill high-purity argon to 380Pa; turn on the power, heat the alloy to 2410K at a heating rate of 18K / min and keep it warm for 15 minutes to ensure that the melt is fully melted and heated evenly; set the orientation in the PLC control panel The solidification speed is 2μm / s, keep the power supply constant and start pulling; after the sample is stretched 100mm, turn ...

Embodiment 3

[0034] A single crystal sample with a seed crystal of 54Ti-43Al-3Si (atomic percentage) was wire-cut into a rod with a cross-sectional diameter of Φ20 mm and a height of 20 mm as a seed crystal, which was welded to a 48.9Ti-45Al- The bottom end of a 6Nb-0.1B (atomic percent) cylinder (Φ20×100mm) master alloy rod-shaped sample. After the assembly is completed, the surface is polished to remove the oxide layer and impurities on the surface, and then coated with a size of Φ20 In a high-purity alumina crucible of ×120 mm, the volume percentage of the coating composition is: 92% yttrium oxide+2% sodium phosphate+6% bentonite. Place the crucible upright on the base of the drawing rod in the melting and directional solidification system in the improved area, adjust the position of the initial drawing rod so that the welding part of the seed crystal enters 5mm above the same level as the bottom of the graphite sleeve, close the vacuum chamber and evacuate to 3 ×10 -3 Pa, and then fil...

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Abstract

The invention discloses a method for preparing directionally solidified high-niobium titanium-aluminum base alloy, which belongs to the field of metal material preparation. High niobium titanium aluminum base alloy is composed of Ti, Al, Nb, W, Mn, C, B, Y, and its atomic percentage is: (43-49)Ti-(45-46)Al-(6-9)Nb- (0-0.5)(W, Mn)-(0-0.5)(C, B)-(0-0.5)Y, using cast master alloy rods melted by plasma arc or vacuum suspension as raw material, mainly yttrium oxide The high-purity alumina ceramic tube after component coating was used as a crucible, and the Ga-In-Sn alloy liquid was used as a cooling liquid. Using the improved zone melting and directional solidification system, the directionally solidified high-niobium titanium-aluminum-based alloy was successfully prepared. The processing technology is simple and reliable, the directional solidification effect is remarkable, and it has universal applicability. The high-niobium titanium-aluminum-based alloy prepared by the directional solidification method has comprehensive high-temperature properties and room-temperature plasticity, and has broad application prospects in high-temperature structural materials.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, and relates to a preparation method for directional solidification of a high-niobium-titanium-aluminum-based alloy. technical background [0002] Titanium-aluminum-based alloy has the advantages of light weight, high specific strength, high specific rigidity, corrosion resistance, wear resistance, high temperature resistance and excellent oxidation resistance, and has excellent mechanical properties at room temperature and high temperature, and the service temperature can reach 700-900 ℃, is one of the excellent candidate high-temperature structural materials in the fields of aviation, aerospace industry, weapon industry and civil industry. In addition to the above advantages, the high-temperature titanium-aluminum-based alloy characterized by high niobium content has significantly higher high-temperature mechanical properties, creep resistance and oxidation properties than ord...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/20
Inventor 林均品丁贤飞王皓亮张来启王艳丽叶丰陈国良
Owner UNIV OF SCI & TECH BEIJING
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