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Er-containing high-niobium Ti-Al intermetallic compound material and preparation method thereof

An intermetallic compound, high niobium technology, applied in the intermetallic compound material, Er-containing high niobium TiAl intermetallic compound material and its preparation field

Inactive Publication Date: 2013-05-01
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no reports on the preparation of high-Nb TiAl intermetallic materials containing rare earths and the physical metallurgical behavior of rare earth Er in TiAl alloys.

Method used

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  • Er-containing high-niobium Ti-Al intermetallic compound material and preparation method thereof
  • Er-containing high-niobium Ti-Al intermetallic compound material and preparation method thereof
  • Er-containing high-niobium Ti-Al intermetallic compound material and preparation method thereof

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Embodiment 1

[0017] The preparation of the Er-containing high-niobium TiAl intermetallic compound material of the present embodiment is realized through the following steps: 1. Take the following raw materials: sponge titanium, high-purity aluminum, aluminum-niobium master alloy and aluminum-erbium master alloy, wherein Ti45.8at.% , Al46at.%, Nb8at.%, Er0.2at.%; 2. Layer the raw materials weighed in step 1 into the water-cooled copper crucible vacuum induction melting furnace, and the layers from bottom to top are sponge titanium layer, high Pure aluminum layer, aluminum niobium master alloy layer, aluminum erbium master alloy layer and sponge titanium layer; 3. Before melting, preheat the metal mold at a temperature of 350 ℃, and vacuum the water-cooled copper crucible vacuum induction melting furnace to 3.0× 10 -3 mbar; 4. Increase the smelting power of the water-cooled copper crucible vacuum induction melting furnace to 180kw at a growth rate of 10kw / min, then stop increasing the power,...

Embodiment 2

[0020] (1) Weigh the following raw materials: titanium sponge, high-purity aluminum, aluminum-niobium master alloy and aluminum-erbium master alloy; wherein the molar percentages of Al, Nb, Er and Ti elements are controlled to be 41%~46% of Al, 8~10% Nb, 0.2-0.4% Er and the rest Ti and impurities;

[0021] (2) Add the raw materials weighed in step (1) into the water-cooled copper crucible vacuum induction melting furnace in layers, and the layers from bottom to top are sponge titanium layer, high-purity aluminum layer, aluminum-niobium master alloy layer, aluminum Erbium intermediate alloy layer and sponge titanium layer; before melting, the metal mold is preheated to 300~350℃, and the water-cooled copper crucible vacuum induction melting furnace is evacuated to 2.0~3.0×10 -3 mbar, increase the melting power of the water-cooled copper crucible vacuum induction melting furnace to 160-180kw at a growth rate of 5-10kw / min, then stop increasing the power, and then melt at a consta...

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Abstract

The invention discloses an Er-containing high- niobium Ti-Al intermetallic compound material and a preparation method thereof, and belongs to intermetallic compound materials. The material is composed of the following elements in mole percent: 41-46 percent of Al, 5-15 percent of niobium, no more than 0.4 percent of Er, and the balance of Ti and unavoidable impurities. The preparation method comprises the following steps: adding titanium sponge, high-purity aluminium, Al- niobium intermediate alloy and Al-Er intermediate alloy into a water cooled copper crucible vacuum induction smelting furnace as per the composition, vacuumizing to 2.0-3.0*10<-3>mbar, rising the smelting power to 160-180 kW at the speed of 5-10 kW / min and stopping at 160-180 kW, smelting for 1-3 minutes at a constant power, obtaining melt, mixing the melt uniformly; and casting the melt into a metal mold preheated to 300-350 DEG C, forming an Er-containing high-niobium Ti-Al intermetallic compound material ingot, and cooling together with the smelting furnace. The method enables the crystal size and layer space of the Ti-Al intermetallic chemical combination to be smaller and thinner.

Description

technical field [0001] The invention relates to a rare earth element-containing intermetallic compound and a preparation process thereof, in particular to an Er-containing high-niobium TiAl intermetallic compound material and a preparation method thereof, belonging to the intermetallic compound material. Background technique [0002] Due to its low density, low expansion coefficient, high specific strength, high elastic modulus, and good high-temperature creep and oxidation resistance, TiAl intermetallic compounds are highly valued in the fields of aviation, aerospace, and automobiles. However, the disadvantages of TiAl intermetallic compounds, such as low room temperature plasticity and poor hot processability, limit their wide application. Scholars at home and abroad have done a lot of research work on the microstructure, plasticity and deformation of TiAl intermetallic compounds. The results show that refining the microstructure is an important means to improve the mecha...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C30/00C22C1/03
Inventor 陈子勇宫子琪柴丽华相志磊
Owner BEIJING UNIV OF TECH
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