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A preparation method of tungsten alloy precursor composite powder, tungsten alloy and preparation method

A technology of composite powder and tungsten alloy, applied in the field of tungsten alloy, can solve the problems of uneven distribution and easy segregation, and achieve the effect of improving uniformity and high temperature wear resistance and erosion resistance.

Active Publication Date: 2020-04-10
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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  • A preparation method of tungsten alloy precursor composite powder, tungsten alloy and preparation method

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preparation example Construction

[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 a preparation method of the tungsten alloy precursor composite powder, which includes the following steps:

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

[0027] The preparation method of the tungsten alloy precursor composite powder of the present invention adopts oxalic acid to adjust 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-reaction of tungstic acid and aluminum oxal...

Embodiment 1

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

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

[0054] Add oxalic acid to the obtained mixed solution to adjust pH=1.5, and then heat it in a water bath at 100°C. After the temperature of the mixed solution rises to 100°C, continue to heat it in a water bath at 100°C, and keep stirring the mixed solution during the heating process. The reaction is complete, suction filtered and dried to obtain a mixed powder;

[0055] 2) Spread the obtained mixed powder into a material layer with a thickness of 2 mm and then calcinate at 550 ° C for 1 h, then place the calcined product in a tubular reduction furnace, spread it into a material layer with a thickness of 3 mm, and then pass in hydrogen ...

Embodiment 2

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

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

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

[0060] 2) Spread the obtained mixed powder into a material layer with a thickness of 6 mm and then calcinate at 550 ° C for 1.5 h, then place the calcined product in a tubular reduction furnace, spread it into a material layer with a thickness of...

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Abstract

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, belonging to the technical field of tungsten alloys. The preparation method of the tungsten alloy precursor composite powder of the present invention includes: providing a mixed solution of ammonium metatungstate and soluble aluminum salt, adding oxalic acid to the mixed solution until the pH is not greater than 1.5, the reaction is complete, and then removing the solvent to obtain the mixed powder . The preparation method of the present invention adopts oxalic acid to adjust pH after liquid-liquid mixing, and hydrogen ion and tungstate ion in the solution can react to generate tungstic acid precipitation; Oxalate ion and aluminum ion react to generate aluminum oxalate precipitation, because tungstic acid and oxalic acid The reason for the co-reaction and co-precipitation of aluminum can avoid serious segregation caused by the large difference in mass between tungsten nuclei and aluminum nuclei, improve the uniformity between tungstic acid and aluminum oxalate in the obtained powder, and make it reach molecular level mixing. The high temperature wear resistance and erosion resistance of tungsten alloy provide the raw material basis.

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, belonging to the technical field of tungsten alloys. Background technique [0002] The traditional tungsten alloy preparation process is solid + solid (liquid) powdering, 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 in the tungsten alloy grains. Growth, coarse grains, and grain boundary segregation problems, and sintered tungsten alloys also have defects such as low hardness, low plasticity, and low strength. High specific gravity tungsten alloy is a high-density, high-strength, high-ductility material, widely used in military, aerospace, metallurgy, machinery and other fields. , low recrystallization temperature, insufficient high temperature strength...

Claims

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Application Information

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Patent Type & Authority Patents(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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