Aluminum-tungsten-niobium three-element intermediate alloy and preparation method thereof

A master alloy and three-element technology, which is applied in the field of aluminum-tungsten-niobium three-element master alloy and its preparation, can solve the problems of increasing refractory and easy segregation, and high cost of preparation and storage of pure tungsten powder, so as to improve stability, ensure composition and Its uniformity and the effect of avoiding the instability of melting current

Inactive Publication Date: 2015-06-03
BAOSTEEL SPECIAL STEEL CO LTD
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Problems solved by technology

The W element is directly added by pure tungsten powder, and there is no relevant patent introduction about the addition of W master alloy for the ingot smelting of TiAl intermetallic compounds, and W powder is a high melting point refractory metal, which will increase the W element smelting The proportion of refractory and easy segregation is high, and the preparation and storage cost of pure tungsten powder is relatively high for large ingot mass production. Therefore, it is necessary to design an intermediate alloy with W added instead of pure tungsten powder to alleviate the segregation problem of elements. Obtain titanium-aluminum intermetallic ingot with high melting point and high alloy content with controllable composition and uniformity

Method used

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  • Aluminum-tungsten-niobium three-element intermediate alloy and preparation method thereof

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preparation example Construction

[0019] The preparation method of the above-mentioned aluminum-tungsten-niobium three-element master alloy comprises the following steps:

[0020] A. Take Al, WO 3 , Nb 2 o 5 As a raw material, after mixing according to 50-90wt%: 30-55wt%: 25-55wt%, the aluminum-tungsten-niobium three-element master alloy ingot is obtained through the aluminothermic reaction;

[0021] B. The above-mentioned master alloy ingot is finished, crushed and selected to make master alloy products with a particle size of 0.25-6mm, and its composition includes 25-40wt% of W, 20-35wt% of Nb, 0-0.3wt% of Trace elements, the balance is Al.

[0022] And adopt the master alloy product of the present invention to be used for the smelting method of high Nb-TiAl intermetallic compound ingot, comprise the following steps:

[0023] A. The composition contains 25-40wt% W, 20-35wt% Nb, 0-0.3wt% trace elements, the balance is Al, and the aluminum-tungsten-niobium three-element master alloy product with a parti...

Embodiment 1

[0027] High Nb-TiAl alloy:

[0028] The standard nominal composition is Ti-28.56Al-18.575Nb-0.87W-0.051B-0.042Y (by weight percentage: wt%).

[0029] Take Al, WO 3 , Nb 2 o 5 As raw material, according to Al:WO 3 :Nb 2 o 5 = 70.5wt%: 37.19wt%: 37.67wt% After the proportioning and mixing, the aluminum-tungsten-niobium three-element intermediate alloy ingot is obtained through the aluminothermic reaction, and the intermediate alloy with a particle size of 0.25mm is made through finishing, crushing, and selection. alloy products. The composition of the master alloy product is W: 29.48wt%, Nb: 26.33wt%, C: 0.018wt%, N: 0.015wt%, O: 0.066wt%, Al: the balance. After the master alloy product is mixed with sponge titanium, Al-Nb, Al-Ti-B and Al wire master alloy raw materials according to the ratio of 2.69:52.08:25.43:4.55:15.72 (wt%), after raw material stirring, mold cloth and High Nb-TiAl intermetallic compound electrodes for plasma-cooled hearth furnaces are made by extrus...

Embodiment 2

[0031] High Nb-TiAl alloy:

[0032] The standard nominal composition is Ti-28.56Al-18.575Nb-0.87W-0.051B-0.042Y (by weight percentage: wt%).

[0033] Take Al, WO 3 , Nb 2 o 5As a raw material, after mixing according to Al:WO3:Nb2O5=57.2:43.5:42.3 (wt%), according to the method of Example 1, a master alloy product with a particle size of 6mm was produced. The composition of the master alloy product is: W: 34.39wt%, Nb: 29.56wt%, C: 0.021wt%, N: 0.014wt%, O: 0.062wt%, Fe: 0.063wt%, Si: 0.047wt%, Al :margin. After the master alloy product is mixed with sponge titanium, Al-Nb, Al-Ti-B and Al wire master alloy raw materials according to the ratio of 2.55:52.5:25.4:4.57:15.87 (wt%), after raw material stirring, mold cloth and High Nb-TiAl intermetallic compound electrodes for plasma-cooled hearth furnaces are made by extrusion and other steps, and the composition is Ti-27.19Al-17.98Nb-0.84W-0.043B-0.03Y (according to Weight percentage: wt%) high Nb-TiAl intermetallic compound ...

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Abstract

The invention discloses an aluminum-tungsten-niobium three-element intermediate alloy which comprises the following components in percentage by weight: 25-40wt% of W, 20-35wt% of Nb, 0-0.3wt% of microelements and the balance of Al. The invention further discloses a preparation method of the intermediate alloy and a method for preparing a high Nb-TiAl intermetallic compound cast ingot by using the intermediate alloy. By adopting the alloy disclosed by the invention, the phenomenon that the melting current is unstable due to inconsistency of metal single substances in of the melting point is avoided in the intermetallic compound melting process, and the stability of the melting process is improved, and the probability that high-melting-point refractory elements Nb and W form a severe high-density inclusion and segregation defect is effectively reduced, so that the components and uniformity of the high-melting-point refractory element titanium aluminum intermetallic compound are guaranteed due to the invention and application of the intermediate alloy.

Description

technical field [0001] The invention relates to a master alloy, in particular to a three-element master alloy of aluminum, tungsten and niobium and a preparation method thereof. Background technique [0002] In terms of intermetallic compounds, domestic and foreign researchers have vigorously promoted the composition, structure, performance, preparation process and application technology of a high-Nb content high-temperature titanium-aluminum alloy. Compared with conventional titanium-aluminum alloys, its service temperature is increased by 60-100 ℃, high strength 300 ~ 500MPa. Its strength index is similar to that of ordinary deformed nickel-based superalloy for turbine discs, and its specific gravity is about half of it. Its oxidation resistance is far superior to that of ordinary titanium-aluminum alloys, and is similar to that of nickel-based superalloys with the best oxidation resistance. [0003] This type of intermetallic compound is high in Nb and low in Al, and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C21/00C22C30/00
Inventor 杨昭许正芳王宁徐锋石磊
Owner BAOSTEEL SPECIAL STEEL CO LTD
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