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Preparation method of tungsten alloy precursor compound powder, tungsten alloy and preparation method of tungsten alloy

A composite powder and tungsten alloy technology, which is applied in the field of high temperature structural materials, can solve the problems of the second phase aggregation and growth of tungsten alloy grains, uneven distribution of the second phase, and low hardness of tungsten alloy, so as to improve the internal elements. Distribute, solve low density, improve the effect of uniform consistency

Active Publication Date: 2019-01-08
HENAN UNIV OF SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

The traditional tungsten alloy preparation process is solid + solid (liquid) powder making, pressing, and sintering, but the tungsten alloy produced by this process generally has uneven distribution of the second phase, which leads to the aggregation of the second phase existing in the tungsten alloy grains. Growth, coarse grains, and grain boundary segregation problems, and the sintered tungsten alloy also has defects such as low hardness, low toughness, and low strength.

Method used

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  • Preparation method of tungsten alloy precursor compound powder, tungsten alloy and preparation method of tungsten alloy
  • Preparation method of tungsten alloy precursor compound powder, tungsten alloy and preparation method of tungsten alloy

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preparation example Construction

[0023] The invention provides a method for preparing a tungsten alloy precursor composite powder capable of improving the toughness of the tungsten alloy, comprising the following steps:

[0024] Provide a mixed dispersion of ammonium paratungstate, soluble iron salt, soluble nickel salt and soluble aluminum salt; use oxalic acid to adjust the pH of the mixed dispersion to not more than 1.5, complete the reaction, and then remove the solvent to obtain a mixed powder.

[0025] The preparation method of the tungsten alloy precursor composite powder of the present invention uses oxalic acid to adjust the pH of the mixed dispersion liquid, and the hydrogen ions and tungstate ions in the solution will react to form tungstic acid precipitation; oxalate ions and iron ions, nickel ions, aluminum The ions react to form iron oxalate, nickel oxalate and aluminum oxalate precipitates. Since the newly formed tungstic acid, iron oxalate, nickel oxalate and aluminum oxalate are the cause of c...

Embodiment 1

[0058] The preparation method of the tungsten alloy precursor composite powder of the present embodiment comprises the following steps:

[0059] 1) 131.28kg ammonium paratungstate (APT), 15.60kg nickel sulfate (NiSO 4 ·6H 2 O), 5.36kg iron sulfate [Fe 2 (SO 4 ) 3 ] and 0.84kg aluminum sulfate [Al 2 (SO 4 ) 3 ] was added to 51L of distilled water, and the mixed dispersion was obtained after the dissolution was complete;

[0060] Add oxalic acid to the resulting mixed dispersion to adjust the pH to 1.5, and then use a 100°C water bath to heat it. After the temperature of the mixed dispersion rises to 100°C, continue to use a 100°C water bath to heat the mixed dispersion. Stir; after the reaction is complete, suction filter and dry to obtain a mixed powder;

[0061] 2) Spread the obtained mixed powder into a material layer with a thickness of 5 mm and then calcinate at 550 ° C for 1 h, then put the calcined product into a tubular reduction furnace, spread it into a materi...

Embodiment 2

[0063] The preparation method of the tungsten alloy precursor composite powder of the present embodiment comprises the following steps:

[0064] 1) 134.26kg ammonium paratungstate (APT), 9.36kg nickel sulfate (NiSO 4 ·6H 2 O), 3.21kg iron sulfate [Fe 2 (SO 4 ) 3 ] and 0.34kg aluminum sulfate [Al 2 (SO 4 ) 3 ] was added to 49L of distilled water, and the mixed dispersion was obtained after the dissolution was complete;

[0065] Add oxalic acid to the resulting mixed dispersion to adjust the pH to 1.5, and then use a 90°C water bath to heat it. After the temperature of the mixed dispersion rises to 90°C, continue to use a 90°C water bath to heat the mixed dispersion. Stir; after the reaction is complete, suction filter and dry to obtain a mixed powder;

[0066] 2) Spread the obtained mixed powder into a material layer with a thickness of 6mm, and then calcinate it at 550°C for 1.5h, then put the calcined product into a tubular reduction furnace, spread it into a material...

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Abstract

The invention relates to a preparation method of tungsten alloy precursor compound powder, a tungsten alloy and a preparation method of the tungsten alloy, and belongs to the technical field of high-temperature structural materials. The preparation method of the tungsten alloy precursor compound powder comprises the following steps that a mixed dispersion solution of ammonium paratungstate, soluble ferric salt, soluble nickel salt and soluble aluminum salt is provided; the pH of the mixed dispersion solution is adjusted to be not higher than 1.5 by the aid of oxalic acid, after complete reaction, mixed powder is obtained through removal of a solvent, and then the tungsten alloy precursor compound powder is obtained. According to the preparation method of the tungsten alloy precursor compound powder, the pH of the mixed dispersion solution is adjusted by the aid of the oxalic acid, newly-produced tungstic acid, ferric oxalate, nickel oxalate and aluminum oxalate are subjected to commonreaction and co-precipitation, thus the uniformity and the consistency of various components of the mixed powder are improved, refined crystalline strengthening and dispersion strengthening of the tungsten alloy can be realized by the aid of the obtained compound powder, the toughness of the tungsten alloy can be improved while the strength of the tungsten alloy is substantially improved, and thenano ceramic particle dispersion reinforced high-strength and high-toughness tungsten alloy can be prepared from the compound powder.

Description

technical field [0001] The invention relates to a preparation method of a tungsten alloy precursor composite powder, a tungsten alloy and a preparation method thereof, and belongs to the technical field of high-temperature structural materials. Background technique [0002] High specific gravity tungsten alloy is a high-density, high-strength, high-ductility material, which is widely used in military, aerospace, metallurgy, machinery and other fields. , low recrystallization temperature, and insufficient high-temperature strength limit its wider application. oxides (such as La 2 o 3 , Y 2 o 3 etc.) and carbides (such as TaC, ZrC, etc.) have the characteristics of high melting point, high temperature strength, good chemical stability, etc., so they are often used as alloys (Cu alloys, Al alloys, Mg alloys, W alloys, etc.) Strengthen the second phase. The traditional tungsten alloy preparation process is solid + solid (liquid) powder making, pressing, and sintering, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F1/00C22C32/00C22C1/05C22C1/10
CPCB22F1/0003C22C1/05C22C27/04C22C32/0031B22F9/22
Inventor 魏世忠潘昆明王长记周玉成陈冲张程毛丰熊美徐流杰张国赏刘伟李秀青游龙汪宙李洲
Owner HENAN UNIV OF SCI & TECH
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