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Preparation method of large high density tungsten alloy counterweight

A tungsten alloy and counterweight technology, which is applied in the field of high-density tungsten alloy large-scale counterweight and its preparation, can solve the problems of low uniformity of internal and external density, affect the processing and use of counterweight, and a large number of pores, etc., to achieve low cost and meet density Requirements, organization uniform effect

Active Publication Date: 2014-06-18
北方材料科学与工程研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the solid phase sintering process, it is difficult to achieve the ideal density of the large billet, so there are a large number of pores, looseness and other defects in the core of the billet, the uniformity of the internal and external density is low, and the extremely low material properties affect the further processing and use of the counterweight. Therefore, this process can only be used to prepare products with simple shapes and low performance requirements.

Method used

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  • Preparation method of large high density tungsten alloy counterweight
  • Preparation method of large high density tungsten alloy counterweight
  • Preparation method of large high density tungsten alloy counterweight

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The manufacturing weight is 100Kg cylindrical counterweight, and the density requirement is 17.3g / cm 3 ±0.2g / cm 3 .

[0024] Step 1: The cylindrical counterweight can be divided into two small counterweights of 50Kg for preparation;

[0025] Step 2: The components and their contents in terms of mass percentage are: tungsten W: 91%, nickel Ni: 6.3%, iron Fe: 2.7%. According to the mass percentage of the above-mentioned powder raw materials, the average particle size of tungsten powder is 2.5μm~3.5μm, and the purity is ≥99%; the average particle diameter of nickel powder is about 1μm~3μm, and the purity is ≥99.8%; the average particle diameter of iron powder is about 1μm~3μm , purity ≥ 99.5%; mix in a mechanical mixer for 12 hours.

[0026] Step 3: Put the mixed raw material powder into a soft rubber mold, seal the rubber plug, and put it into a wet-jacket cold isostatic press for pressing with a pressing force of 200MPa and hold the pressure for 3s.

[0027] Step 4: ...

Embodiment 2

[0030] The manufacturing weight is 150Kg cylindrical counterweight, and the density requirement is 17.6g / cm 3 ±0.2g / cm 3 .

[0031] Step 1 The cylindrical counterweight can be divided into three small counterweights of 50Kg for preparation;

[0032] The components and their content in step 2 by mass percentage are: tungsten W: 93%, nickel Ni: 5%, iron Fe: 2%. According to the mass percentage of the above-mentioned powder raw materials, the average particle size of tungsten powder is 2.5μm~3.5μm, and the purity is ≥99%; the average particle diameter of nickel powder is about 1μm~3μm, and the purity is ≥99.8%; the average particle diameter of iron powder is about 1μm~3μm , purity ≥ 99.5%; mix in a mechanical mixer for 12 hours.

[0033] Step 3: Put the mixed raw material powder into a soft rubber mold, seal the rubber plug, and put it into a wet-jacket cold isostatic press for pressing with a pressing force of 200MPa and hold the pressure for 3s.

[0034] Step 4: Put the pre...

Embodiment 3

[0037] The manufacturing weight is 300Kg cylindrical counterweight, and the density requirement is 18.0±0.2g / cm 3 .

[0038] Step 1 The cylindrical counterweight can be divided into six small counterweights of 50Kg for preparation;

[0039]The components and their contents in step 2 by mass percentage are: tungsten W: 95%, nickel Ni: 3%, iron Fe: 2%. According to the mass percentage of the above-mentioned powder raw materials, the average particle size of tungsten powder is 2.5μm~3.5μm, and the purity is ≥99%; the average particle diameter of nickel powder is about 1μm~3μm, and the purity is ≥99.8%; the average particle diameter of iron powder is about 1μm~3μm , purity ≥ 99.5%; mix in a mechanical mixer for 12 hours.

[0040] Step 3: Put the mixed raw material powder into a soft rubber mold, seal the rubber plug, and put it into a wet-jacket cold isostatic press for pressing with a pressing force of 200MPa and hold the pressure for 3s.

[0041] Step 4: Put the pressed blank...

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Abstract

A preparation method of a large high density tungsten alloy counterweight is characterized by comprising the steps that: dividing the large counterweight into a plurality of small counterweights with the weight below 50Kg; compounding, by mass, the following components: 91%-95% of tungsten powder, 3.50%-7.5% of nickel powder and 1.0%-3.0% of iron powder; weighing the three kinds of raw material powder, mixing evenly and pressing into a small counterweight blank, then performing liquid phase sintering; processing the connection surfaces of the sintered small counterweights into flat faces, putting one of the small counterweights in a sintering boat, wherein the connection surface maintains horizontal or is vertical to the sintering boat, then putting another small counterweight with the connection surfaces of the small counterweight and the before small counterweight being attached, putting other small counterweights in the same manner, and finally putting all the small counterweights together with the sintering boat into a fixed-point type hydrogen furnace for liquid phase sintering. The large tungsten alloy counterweight prepared by the method is high in density and uniform in structure, the average grain size of the sintered counterweight is 30-50 mum, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy and relates to a high-density tungsten alloy large counterweight and a preparation method thereof, which is suitable for preparing counterweights for large ships, airplanes and automobiles. Background technique [0002] The density of tungsten alloy is twice that of steel and more than 1.5 times that of lead, and it is non-toxic, non-radiative, environmentally safe, corrosion-resistant, high-hardness, easy to process, and can maintain the same shape for a long time, which can greatly reduce the weight of parts. Size, is the material of choice for a variety of counterweight products. Various tungsten alloy counterweights of different shapes and weights are installed on many ships, racing cars, automobiles and airplanes. [0003] The preparation method of tungsten alloy counterweight usually adopts powder metallurgy technology. The main process route is that raw material powders such as t...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C27/04
Inventor 冯宏伟侯福青吴红祝理君邹敏明赵红梅梁栋
Owner 北方材料科学与工程研究院有限公司
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