Preparation method of directional solidification high-niobium TiAl-base alloy

A technology of directional solidification and high-niobium titanium-aluminum, which is 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, improve room temperature performance, and reduce impurities The effect of content

Active Publication Date: 2010-11-03
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
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  • Application Information

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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

Method used

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  • Preparation method of directional solidification high-niobium TiAl-base alloy

Examples

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Effect test

Embodiment 1

[0030] Grind the surface of the cylindrical (Φ6×100mm) master alloy rod-shaped sample with the 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 load the coating In a high-purity alumina crucible with a post-layer size of Φ6×120mm, the volume percentage of the coating composition is: 90% yttrium oxide + 3% sodium phosphate + 7% bentonite. Place the crucible firmly on the base of the drawing rod in the directional solidification system of the improved zone, close the vacuum chamber and evacuate to 3×10 -3 After Pa, fill with high-purity argon gas to 380Pa; turn on the power, heat the alloy to 1950K at a heating rate of 18K / min and keep it 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 of the power constant and start pulling; after the sample is stretched for 100mm, turn off the...

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 it In the high-purity alumina crucible with a size of Φ10×120mm after being coated, the volume percentage of the coating composition is: 87% yttrium oxide + 3% sodium phosphate + 10% bentonite. Place the crucible firmly on the base of the drawing rod in the directional solidification system of the improved zone, close the vacuum chamber and evacuate to 3×10 -3 After Pa, fill with high-purity argon to 380Pa; turn on the power, heat the alloy to 2410K at a heating rate of 18K / min and keep it 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 of the power constant and start pulling; after the sample is stretched for 100mm, turn off the powe...

Embodiment 3

[0034] Cut a single crystal sample with a seed crystal of 54Ti-43Al-3Si (atomic percentage) into a rod shape with a cross-sectional diameter of Φ20mm and a height of 20mm as the seed crystal, and weld it to a composition of 48.9Ti-45Al- by argon arc welding. The bottom end of the 6Nb-0.1B (atomic percentage) cylinder (Φ20×100mm) master alloy rod sample. After the assembly is completed, the surface is polished to remove the oxide layer and impurities on the surface, and then the size of the coating is Φ20 In the high-purity alumina crucible of ×120mm, the volume percentage of the coating composition is: 92% yttrium oxide + 2% sodium phosphate + 6% bentonite. Place the crucible firmly on the drawing rod base in the improved zone melting directional solidification system, adjust the initial drawing rod position so that the seed crystal welding point enters 5mm above the same horizontal position at the bottom of the graphite sleeve, close the vacuum chamber and evacuate to 3 ×10 -3...

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Abstract

The invention discloses a preparation method of a directional solidification high-niobium TiAl-base alloy, which belongs to the field of metal material preparation. The high-niobium TiAl-base alloy contains Ti, Al, Nb, W, Mn, C, B and Y, and the atomic percentage is: (43-49) Ti-(45-46) Al-(6-9) Nb-(0-0.5) (W and Mn)-(0-0.5) (C and B)-(0-0.5) Y, an as-cast master alloy rod which is smelted by plasma arc or vacuum suspension is taken as a raw material, a high-purity alumina ceramic tube with a coating layer of which the main component is yttrium oxide is used as a crucible, Ga-In-Sn alloy liquid is cooling liquid, and the directional solidification high-niobium TiAl-base alloy is successfully prepared by using an improved zone-melting and directional solidification system. The processing technology is simple and reliable, the directional solidification effect is obvious, and the method has universal applicability. The directional solidification high-niobium TiAl-base alloy which is prepared by the directional solidification method has comprehensive and good high temperature performance and room temperature ductility and has wide application prospect in terms of 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 of directional solidification of a high-niobium titanium-aluminum base 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. The use temperature can reach 700-900 ℃, it 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 ordinary titani...

Claims

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Application Information

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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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