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High-temperature high-hardness high-Nb-TiAl-Si alloy and preparation method thereof

A technology of nb-tial-si, high hardness, applied in high hardness and high Nb-TiAl-Si alloy and its preparation, high temperature field, can solve high Nb-TiAl alloy low room temperature plasticity, difficult preparation and processing, and limit industrial application process etc. to achieve high oxidation resistance and good mechanical properties

Inactive Publication Date: 2020-03-27
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high Nb-TiAl alloys are difficult to prepare and process due to their low room temperature plasticity, which limits their industrial application.

Method used

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  • High-temperature high-hardness high-Nb-TiAl-Si alloy and preparation method thereof
  • High-temperature high-hardness high-Nb-TiAl-Si alloy and preparation method thereof
  • High-temperature high-hardness high-Nb-TiAl-Si alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] The preparation method of the high Nb-TiAl-Si alloy of the present embodiment is prepared as follows: according to the atomic percentage, 49 parts of titanium sponge with a purity of 96.7%, 5 parts of 99.99% niobium powder, and 46 parts of 99.91% Al Blocks are used as raw materials, which are melted in a nitrogen protective atmosphere in a vacuum intermediate frequency induction melting furnace. Place the raw materials in the following order: first place the rare metal Nb powder, then place the Al block, and finally place the sponge Ti on the uppermost layer of the smelting furnace, and close the side furnace door. Before smelting, use mechanical pump and vacuum pump to evacuate to 1×10 -3 Pa, then filled with high nitrogen gas to 1000Pa. Start smelting, and control the smelting power to be 500Kw. In order to ensure the uniformity of the chemical composition of the ingot, each sample was turned and smelted six times. After smelting, the molten metal is poured into a ...

Embodiment 2

[0027] The preparation method of the high Nb-TiAl-Si alloy of the present embodiment is prepared according to the following method: get 48.9 parts of titanium sponge with a purity of 96.7%, 5 parts of 99.99% niobium powder, and 45.9 parts of 99.91% Al Block and 0.2 parts of Si are used as raw materials, which are smelted in a vacuum medium frequency induction melting furnace under a nitrogen protective atmosphere. Place the raw materials in the following order: first place the rare metal Nb powder, then place the Si and Al blocks, and finally place the sponge Ti on the uppermost layer of the smelting furnace, and close the side furnace door. Before smelting, use mechanical pump and vacuum pump to evacuate to 1×10 -3 Pa, then filled with high nitrogen gas to 1000Pa. Start smelting, and control the smelting power to be 500Kw. In order to ensure the uniformity of the chemical composition of the ingot, each sample was turned and smelted six times. After smelting, the molten met...

Embodiment 3

[0029] The difference between this embodiment and Embodiment 2 is that the alloy is heat treated at 950° C. for 10 hours. Others are identical with embodiment 2.

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Abstract

The invention discloses a high-temperature high-hardness high-Nb-TiAl-Si alloy and a preparation method thereof, and belongs to the field of special metals. The preparation method comprises the following steps that rare metal Nb powder is firstly placed, then Si powder and Al blocks are placed, finally, sponge Ti is placed on the uppermost layer in a smelting furnace, and a side furnace door is closed; before smelting, the smelting furnace is vacuumized, then nitrogen is added, a sample is started to be overturned and smelted, after smelting is finished, molten metal is poured into a self-mademold to obtain a rod-shaped sample, and the rod-shaped sample is cooled and taken out; wire cutting and mechanical polishing are performed on the test material to remove surface impurities, and thenthe test material is washed with acetone, is sealed into a quartz tube for heat treatment, and then is quenched into ice water; and then a high-temperature oxidation experiment is performed on the alloy to obtain the high-hardness high-oxidation-resistance high-Nb-TiAl-Si alloy. The grains of the high-Nb-TiAl-Si alloy prepared through the preparation method are obviously refined, compared with thegrain diameter of an existing Nb-TiAl alloy, the grain diameter is obviously reduced, which indicates that the high-Nb-TiAl-Si alloy prepared through the preparation method has the quite good mechanical property.

Description

technical field [0001] The invention belongs to the field of special metals, and specifically relates to a high-temperature, high-hardness and high-Nb-TiAl-Si alloy and a preparation method thereof. Background technique [0002] The development of today's world advocates an energy-based society. With the continuous research and breakthroughs in material science, people are gradually replacing traditional industrial materials with new energy-saving materials. The materials used in aerospace are required to have the characteristics of light weight, good creep resistance, high temperature resistance, and good oxidation resistance. Therefore, Ti-Al alloys have become a hot spot in the field of material science research. However, during the research process, people found that Ti Although some properties of -Al alloys have been optimized, there are still disadvantages of poor processability at room temperature, poor oxidation resistance at high temperatures, low hardness, and redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C1/02C22C14/00C22C21/00C22F1/18C22F1/04
CPCC22C1/1036C22C14/00C22C21/00C22F1/04C22F1/183
Inventor 董桂馥闫语童谢景卫杨浩姜春晖
Owner DALIAN UNIV
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