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Tungsten alloy material containing yttria and preparation method thereof

A technology of tungsten alloy and yttrium oxide, which is applied in the field of powder metallurgy, can solve the problems of failure to obtain and achieve the effects of inhibited growth, reasonable formula and short sintering time

Inactive Publication Date: 2009-09-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the paper "SPS Sintering Behavior of W-Ni-Fe High Specific Gravity Alloys" published in "Journal of University of Science and Technology Beijing", Volume 29, Issue 5, 2007, 93W-5.6Ni-1.4Fe was prepared by spark plasma sintering It is confirmed that spark plasma sintering can indeed inhibit the growth of tungsten grains and obtain a microstructure with a relatively uniform grain size. However, due to the absence of Y 2 o 3 And fully optimize the tungsten alloy composition formula and sintering process, but still fail to obtain a bulk sintered alloy with a fine structure, thereby significantly improving the overall performance of the sintered alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of preparation method of the tungsten alloy material containing yttrium oxide comprises the steps:

[0030] Step 1: Formulation of tungsten alloy material containing yttrium oxide

[0031] The components and their contents in terms of mass percentage are: W92.50%, Ni5.50%, Fe1.50%, Y 2 o 3 0.50%, the rest are unavoidable trace impurities;

[0032] The above-mentioned raw materials tungsten, nickel and iron are all added in the form of simple substances, among which, the average particle diameter of tungsten powder is about 2.3-2.7 μm, and the purity is ≥99.0%; the average particle diameter of nickel powder is about 1-3 μm, and the purity is ≥99.8%; the average particle size of iron powder is The diameter is about 1-3 μm, and the purity is ≥99.5%; the average particle diameter of yttrium oxide powder is about 1-2 μm, and the purity is ≥99.9%;

[0033] Step 2: Mix the powder

[0034] According to the dosage of the tungsten alloy material formula described in st...

Embodiment 2

[0038] Step 1: Formulation of tungsten alloy material containing yttrium oxide

[0039] The components and their contents in terms of mass percentage are: W93.50%, Ni4.50%, Fe1.50%, Y 2 o 3 0.50%, the rest are unavoidable trace impurities;

[0040] The above-mentioned raw materials tungsten, nickel and iron are all added in the form of simple substances, among which, the average particle diameter of tungsten powder is about 2.3-2.7 μm, and the purity is ≥99.0%; the average particle diameter of nickel powder is about 1-3 μm, and the purity is ≥99.8%; the average particle size of iron powder is The diameter is about 1-3 μm, and the purity is ≥99.5%; the average particle diameter of yttrium oxide powder is about 1-2 μm, and the purity is ≥99.99%;

[0041] Step 2: Mix the powder

[0042] According to the dosage of the tungsten alloy material formula described in step 1, the powder raw material is placed in a drum mixer and mixed for 6 hours;

[0043] Step 3: Spark plasma sinte...

Embodiment 3

[0046] Step 1: Formulation of tungsten alloy material containing yttrium oxide

[0047] The components and their contents in terms of mass percentage are: W93.00%, Ni5.40%, Fe1.00%, Y 2 o 3 0.60%, the rest are unavoidable trace impurities;

[0048] The above-mentioned raw materials tungsten, nickel and iron are all added in the form of simple substances, among which, the average particle diameter of tungsten powder is about 2.3-2.7 μm, and the purity is ≥99.0%; the average particle diameter of nickel powder is about 1-3 μm, and the purity is ≥99.8%; the average particle size of iron powder is The diameter is about 1-3 μm, and the purity is ≥99.5%; the average particle diameter of yttrium oxide powder is about 1-2 μm, and the purity is ≥99.99%;

[0049] Step 2: Mix the powder

[0050] According to the dosage of the tungsten alloy material formula described in step 1, the powder raw material is placed in a drum mixer and mixed for 5 hours;

[0051] Step 3: Spark plasma sinte...

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Abstract

The invention provides a tungsten alloy material containing yttria and a preparation method thereof by optimizing and selecting of a tungsten alloy composition formulation and a sintering process. The method concretely includes the steps of matching raw material powder according to the following mass percentage: 92.50- 93 .50 of W, 4.50-5.50 of Ni, 1.00-2.00 of Fe and 0.05-0.60 of Y2O3; then uniformly mixing the powder by a roller type flour mixing machine; and then performing charge plasma rapid sintering to the powder with the sintering pressure of 30-50MPa, sintering with the heating rate of 50-300 DEG C / min, sintering at the temperature of 1170-1300 DEG C, sintering and holding for 2-10 minutes and sintering with the vacuum of not more than 4Pa, thereby obtaining a high-proportion tungsten alloy block material which has the characteristics of nearly full-density, high hardness, good bending strength resistance under room temperature, excellent high-temperature mechanical performance, and the like and has good price-performance advantage and broad application prospect.

Description

technical field [0001] The invention relates to powder metallurgy technology, in particular to a tungsten alloy material containing yttrium oxide and a preparation method thereof. Background technique [0002] W-Ni-Fe high specific gravity alloy has been widely used in aerospace devices, radiation shielding, military weapons and other fields for a long time because of its excellent mechanical properties such as high density and high strength and good corrosion resistance. The W-Ni-Fe high specific gravity alloy in the prior art is mainly composed of matrix tungsten and binder phase nickel, iron, etc., and adopts traditional pressing and liquid phase sintering methods to achieve nearly full density, but liquid phase sintered tungsten crystal The grains will grow rapidly, usually up to 30-50 μm, thus weakening the mechanical properties of the alloy, especially at high temperatures. [0003] At present, material researchers at home and abroad generally believe that obtaining a...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/05
Inventor 李元元胡可李小强屈盛官张文张大童
Owner SOUTH CHINA UNIV OF TECH
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