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Preparation method of W-Ni-Cu prealloyed powder

A pre-alloyed powder, w-ni-cu technology, applied in the field of tungsten-based alloy powder preparation, can solve the problems of difficult particle size control, inclusions, and restrictions on the structure and performance of tungsten-nickel-copper alloys, and achieve high precision in composition control and process Strong stability and repeatability, the effect of overcoming adverse effects

Inactive Publication Date: 2016-01-27
SHAANXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, many scholars have focused on the microstructure refinement and performance enhancement of W-Ni-Cu alloys mainly in the preparation and modification of raw material powders, while the preparation and modification methods of W-Ni-Cu alloy powders mainly include atomization and water cooling. , high-energy ball milling and oxide reduction, the prepared alloy powder still has problems such as segregation, inclusions, and difficult particle size control, which greatly restricts the further improvement of the structure and properties of tungsten-nickel-copper alloy.

Method used

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  • Preparation method of W-Ni-Cu prealloyed powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) In a vacuum glove box (vacuum degree 0.02MPa), take 83.8% WO by mass percentage 3 (tungsten trioxide), 8.89% NiCl 2 ·6H 2 O (nickel chloride hexahydrate) and 7.31% CuCl 2 (copper chloride) powder; NiCl was mixed with a magnetic stirrer 2 ·6H 2 O, CuCl 2 and deionized water to make a solution with a concentration of 0.34mol / L, and add WO to the solution 3 Powder, water bath temperature 50°C, stirring for 40min; add concentration of 0.358mol / L (NH 4 ) 2 C 2 o 4 (ammonium oxalate) solution, the temperature of the water bath is still 50°C at this time, and stirred for 1.5 hours.

[0024] (2) Filter the solution, and dry it in air at 120°C for 2.2 hours with a blast drying oven to obtain a precursor powder at a heating rate of 13°C / min; place the dry powder in a tube furnace (quartz tube, In a pipe diameter of 60mm), reduce at 510°C, with a heating rate of 5°C / min, a cooling rate of 10°C / min, and keep warm for 3 hours.

[0025] (3) The reduced powder was high-...

Embodiment 2

[0027] (1) Weigh 83.95% WO by mass percentage 3 , 8.56% NiCl 2 ·6H 2 O and 7.49% CuCl 2 powder; NiCl 2 ·6H 2 O, CuCl 2 and deionized water to make a solution with a concentration of 0.34mol / L, and add WO to the solution 3 powder, water bath temperature 50°C, stirred for 30min; add 0.364mol / L (NH 4 ) 2 C 2 o 4 The solution was stirred for 2 hours while the temperature of the water bath was still 50°C.

[0028] (2) Filter the solution and dry it in the air at 120°C for 2.5 hours in a blast drying oven to obtain the precursor powder at a heating rate of 13°C / min; place the dried powder in a tube furnace and reduce it at 530°C at a heating rate of 5°C / min, cooling rate 10°C / min, keep warm for 3.3 hours.

[0029] (3) The reduced powder was high-energy ball milled under the protection of argon for 14 hours, the speed of the ball mill was 340 rpm, the material: ball = 1:11, and finally W-Ni-Cu pre-alloyed powder was obtained.

Embodiment 3

[0031] (1) Weigh 83.45% WO by mass percentage 3 , 8.86% NiCl 2 ·6H 2 O and 7.69% CuCl 2 powder; NiCl 2 ·6H 2 O, CuCl 2 and deionized water to make a solution with a concentration of 0.34mol / L, and add WO to the solution 3 Powder, water bath temperature 50°C, stirred for 45min; add 0.374mol / L (NH 4 ) 2 C 2 o 4 (ammonium oxalate) solution, the temperature of the water bath is still 50° C. at this time, and stirred for 3 hours.

[0032] (2) Filter the solution and dry it in air at 120°C for 2.7 hours in a blast drying oven to obtain precursor powder with a heating rate of 13°C / min; place the dried powder in a tube furnace and reduce it at 520°C with a heating rate of 5°C / min, cooling rate 10°C / min, keep warm for 3.8 hours.

[0033] (3) The reduced powder was high-energy ball milled for 14 hours under the protection of argon, the speed of the ball mill was 330 rpm, and the material: ball = 1:12, and finally W-Ni-Cu pre-alloyed powder was obtained.

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Abstract

The invention discloses a preparation method of W-Ni-Cu prealloyed powder. The preparation method comprises the steps that NiCl2 6H2O, CuCl2 and deionized water are prepared into a solution, and then WO3 powder is added into the solution; a (NH4)2C2O4 solution is added into turbid liquid according to the volume ratio; the solution is filtered and dried in air, and precursor powder is obtained; dried powder is placed in a tube furnace to be reduced under the hydrogen atmosphere condition; and high energy ball milling is carried out on the reduced powder, and the W-Ni-Cu prealloyed powder is finally obtained. The average particle size of the W-Ni-Cu prealloyed powder prepared through the method is smaller than or equal to 0.2 micron, and the distance between dissimilar metal atoms is smaller than or equal to 580 pm.

Description

technical field [0001] The invention relates to a preparation method of tungsten-based alloy powder. Background technique [0002] W-Ni-Cu alloy is an alloy material prepared by adding a small amount of nickel and copper under certain powder metallurgy process conditions with tungsten as the matrix. W-Ni-Cu alloy has the characteristics of high density, high strength, high hardness, good thermal conductivity and machinability, and is widely used in industries such as national defense, aerospace, electrical instruments and die casting. [0003] In recent years, many scholars have focused on the microstructure refinement and performance enhancement of W-Ni-Cu alloys mainly in the preparation and modification of raw material powders, while the preparation and modification methods of W-Ni-Cu alloy powders mainly include atomization and water cooling. , high-energy ball milling and oxide reduction, the prepared alloy powder still has problems such as segregation, inclusions, and...

Claims

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Application Information

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IPC IPC(8): B22F9/22B22F9/04
Inventor 董洪峰郭从盛谭宏斌
Owner SHAANXI UNIV OF TECH
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