Preparation method of tungsten alloy precursor composite powder, ceramic aluminum oxide enhanced tungsten alloy and preparation method thereof

A ceramic alumina and composite powder technology, applied in the field of tungsten alloy, can solve the problems of easy segregation and uneven distribution, and achieve the effect of solving coarse grains and improving the performance of wear resistance and erosion resistance.

Active Publication Date: 2019-01-11
HENAN UNIV OF SCI & TECH
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Problems solved by technology

In the prior art, the master's degree thesis of Henan University of Science and Technology "Al 2 o 3 A Al 2 o 3 The hydrothermal synthesis method of doped tungsten alloy precursor powder. In this method, the mixed solution of ammonium metatungstate and aluminum nitrate is kept at 180°C for 20h, then vacuum filtered, and the filter residue is washed repeatedly and then dried at 120°C for 10h. Then the dried solid powder was calcined at 550°C for 4h, and then underwent two-stage hydrogen reduction (one stage at 600°C for 2h, and the second stage at 900°C for 2h), to obtain Al 2 o 3 Doped with W composite powder, although the composite powder prepared by this method has a smaller particle size and better morphology, it is easy to segregate during the precipitation process, and the Al 2 o 3 and W are unevenly distributed

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  • Preparation method of tungsten alloy precursor composite powder, ceramic aluminum oxide enhanced tungsten alloy and preparation method thereof

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[0025] The uniformity of each component in the tungsten alloy has an important influence on the performance of the tungsten alloy itself. In order to improve the performance in the tungsten alloy, the present invention improves the preparation method of a tungsten alloy precursor composite powder, which includes the following steps:

[0026] Provide a mixed solution of ammonium metatungstate and soluble aluminum salt, add oxalic acid to the mixed solution until the pH is not greater than 1.5, the reaction is complete, and then remove the solvent to obtain a mixed powder.

[0027] The preparation method of the tungsten alloy precursor composite powder of the present invention uses oxalic acid to adjust the pH after liquid-liquid mixing. Hydrogen ions and tungstate ions in the solution will react to form tungstic acid precipitation; oxalate ions and aluminum ions react to form oxalic acid Aluminum precipitation, due to the co-precipitation of tungstic acid and aluminum oxalate, can av...

Embodiment 1

[0052] The preparation method of the tungsten alloy precursor composite powder of this embodiment includes the following steps:

[0053] 1) Combine 138.0kg ammonium metatungstate (AMT) and 1.34kg aluminum sulfate (Al 2 (SO 4 ) 3 ] Dissolve in 45.5L of distilled water, and obtain a mixed solution after all the solids are dissolved;

[0054] Add oxalic acid to the resulting mixed solution to adjust the pH=1.5, and then use a 100°C water bath to heat it. After the temperature of the mixed solution rises to 100°C, continue to use a 100°C water bath to heat the mixed solution. The reaction is complete, filtered and dried to obtain a mixed powder;

[0055] 2) Spread the obtained mixed powder into a material layer with a thickness of 2mm and then calcinate it at 550°C for 1h, then place the calcined product in a tubular reduction furnace, spread it into a layer with a thickness of 3mm, and then pass in hydrogen gas at 590 Reduce at ℃ for 7 hours, then pass through a 60-mesh sieve, take the...

Embodiment 2

[0057] The preparation method of the tungsten alloy precursor composite powder of this embodiment includes the following steps:

[0058] 1) Combine 137.45kg of ammonium metatungstate (AMT) and 10.53kg of aluminum sulfate (Al 2 (SO 4 ) 3 ] Dissolve in 49.33L of distilled water, and obtain a mixed solution after all the solids are dissolved;

[0059] Add oxalic acid to the resulting mixed solution to adjust pH=1.5, and then use a 90°C water bath for heating. After the temperature of the mixed solution rises to 90°C, continue to use a 90°C water bath to heat the mixed solution. The reaction is complete, filtered and dried to obtain a mixed powder;

[0060] 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 place the calcined product in a tubular reduction furnace, spread it into a material layer with a thickness of 4mm, and then pass in hydrogen gas. Reduce at 600℃ for 6h, then pass through 80 mesh screen, tak...

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Abstract

The invention relates to a preparation method of tungsten alloy precursor composite powder, a ceramic aluminum oxide enhanced tungsten alloy and a preparation method of the ceramic aluminum oxide enhanced tungsten alloy, and belongs to the technical field of tungsten alloy. The preparation method of the tungsten alloy precursor composite powder comprises the steps that ammonium metatungstate and amixed solution of soluble aluminum salt are provided, oxalic acid is added into the mixed solution till pH is not larger than 1.5, a complex reaction is carried out, a solvent is removed, and mixed powder is obtained. According to the preparation method, the pH is adjusted through oxalic acid after liquid-liquid mixing, hydrogen ions and tungstate ions in the solution will react to generate tungstate precipitate; oxalate ions and aluminum ions react to generate aluminum oxalate precipitate, serious segregation caused by the mass difference of tungsten atomic nucleuses and aluminum atomic nucleuses can be avoided, the uniformity degree of tungstic acid and aluminum oxalate in the obtained powder is improved, molecular mixing is achieved, and a raw material base is provided for improving high-temperature wear-resisting erosion-resistance performance of tungsten alloy.

Description

Technical field [0001] The invention relates to a preparation method of a tungsten alloy precursor composite powder, a ceramic alumina reinforced tungsten alloy and a preparation method thereof, and belongs to the technical field of tungsten alloys. Background technique [0002] The traditional tungsten alloy preparation process is solid + solid (liquid) powdering, pressing, and sintering. However, the tungsten alloy produced by this process generally has uneven distribution of the second phase, resulting in the accumulation of the second phase in the tungsten alloy grains. Growth, coarse grains, and segregation of grain boundaries, and sintered tungsten alloys also have defects such as low hardness, low plasticity, and low strength. Tungsten alloy with high specific gravity is a material with high density, high strength and high ductility. It is widely used in military, aerospace, metallurgy, machinery and other fields. However, due to coarse grains, low temperature brittleness,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C27/04
CPCC22C1/045C22C27/04
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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