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A kind of high-performance tungsten alloy rod and its preparation method

A tungsten alloy, high-performance technology, applied in the field of high-performance tungsten alloy rods and its preparation, can solve the problems of high cost, less than 10%, and the unsuitability of the swaging process to prepare large-diameter rods, etc., and achieve a high pass rate , Improving the effect of high temperature mechanical properties

Active Publication Date: 2020-06-02
安泰天龙钨钼科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the article "Research Progress in Preparation Methods and High-temperature Mechanical Properties of Tungsten-Rhenium Alloys" (Wang Feng, Zheng Xin, etc. "China Tungsten Industry" 2014, April 29, Volume 2, Issue 2), the author mentioned that foreign W.D. Arc melting prepared W-25Re-0.27HfC alloy ingots, and tried to manufacture W-25Re-0.27HfC alloy rods by hot extrusion, but failed; Todd Leonhardt prepared billets by powder metallurgy, and then passed Hot isostatic pressing treatment, and finally through swaging and extrusion deformation processing methods, the obtained W-24.5Re-2HfC rod with a diameter of about 30mm can reach 1400MPa at room temperature, and the elongation after breaking can reach 10%, 1900 ℃ The tensile strength reaches more than 250MPa, but the elongation after fracture is less than 10%, and the manufacturing method is complicated, and the swaging process is not suitable for preparing rods with larger diameters. The material utilization rate of the hot extrusion process is low, and the cost is low. High, not suitable for large-scale production of tungsten alloy

Method used

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  • A kind of high-performance tungsten alloy rod and its preparation method
  • A kind of high-performance tungsten alloy rod and its preparation method
  • A kind of high-performance tungsten alloy rod and its preparation method

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Effect test

Embodiment 1

[0043] (1) Preparation of tungsten-rhenium pre-alloyed powder: take respectively 39000g of tungsten powder with a Fibonacci particle size of 3.0 μm and a purity of 99.95% and 14400g of ammonium rhenate powder with a purity of 99.99% after grinding and passing through a 200 mesh sieve, and then Add the ammonium acid powder into a mixer equipped with tungsten powder for mixing, the speed is 20r / min, and the mixing time is 1 hour; after mixing evenly, carry out the first hydrogen reduction treatment, that is, react at 420°C for 40 minutes; then carry out the second The second hydrogen reduction treatment is to react at 850°C for 35 minutes; during the hydrogen reduction treatment, the hydrogen flow rate is 7L / min. After the reduction reaction was completed, 49000g rhenium-tungsten pre-alloyed powder was obtained.

[0044] (2) Preparation of tungsten alloy powder: Weigh 1000g of HfC powder with a particle size of -200 mesh and a purity of 99.6%; mix it with tungsten-rhenium pre-al...

Embodiment 2

[0052] (1) Preparation of tungsten-rhenium pre-alloyed powder: Weigh the doped tungsten powder with a Fibonacci particle size of 4.0 μm and a purity of 99.95% (i.e. Si: 0.035wt%, Al: 0.008wt%, K: 0.007wt%, and the rest 16900g of tungsten) and 4320g of ammonium rhenate powder with a purity of 99.99% after grinding and passing through a 200 mesh sieve, then add the ammonium rhenate powder into a mixer equipped with tungsten powder for mixing, the speed of rotation is 15r / min, and the mixing time After mixing evenly, perform the first hydrogen reduction treatment, that is, react at 400°C for 35 minutes, and then perform the second hydrogen reduction treatment, that is, react at 800°C for 45 minutes; during the hydrogen reduction treatment, the hydrogen flow rate is 6L / min. After the reduction reaction was completed, 19900g of rhenium-tungsten pre-alloyed powder was obtained.

[0053] (2) Preparation of tungsten alloy powder: Weigh 100g of ZrC powder with a particle size of -300...

Embodiment 3

[0061] (1) Preparation of tungsten-rhenium pre-alloyed powder: Weigh respectively 22200g of tungsten powder with a Fibonacci particle size of 3.3 μm and a purity of 99.95% and 10800g of ammonium rhenate powder with a purity of 99.99% after grinding and passing through a 200-mesh sieve, and then the rhenium Add the ammonium acid powder into a mixer equipped with tungsten powder for mixing, the speed is 25r / min, and the mixing time is 2 hours; after mixing evenly, carry out the first hydrogen reduction treatment, that is, react at 450°C for 45 minutes, and then carry out the second The second hydrogen reduction treatment is to react at 750°C for 35 minutes; during the hydrogen reduction treatment, the hydrogen flow rate is 10L / min. After the reduction reaction is completed, 29700g rhenium-tungsten pre-alloyed powder is obtained.

[0062] (2) Preparation of tungsten alloy powder: Weigh 300g of TaC powder with a particle size of -200 mesh and a purity of 99.6%; mix it with tungste...

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Abstract

The invention relates to a high-performance tungsten alloy bar and a preparation method thereof. The bar is composed of, by mass, 10%-26% of rhenium, 0.3%-3% of carbide and the balance tungsten, and tungsten can be replaced with Si, Al and K. The preparation method of the high-performance tungsten alloy bar sequentially comprises the steps of tungsten-rhenium prealloy powder preparing, tungsten alloy powder preparing, forming treating, sintering treating, rolling deformation treating, heat treating and high-performance tungsten-rhenium alloy bar obtaining through machining. The tungsten alloyhas the excellent properties of the fine crystalline grains, the uniform structure, the low impurity element content, the high compactness, the high strength and the high temperature creep resistance.According to the tungsten alloy material prepared through the preparation method, the crystalline grains are fine and uniform, the tensile strength at room temperature is larger than or equal to 1,500 MPa, the percentage elongation after fracture at room temperature is larger than or equal to 15%, the tensile strength at 2,000 DEG C is larger than or equal to 200 MPa, and the percentage elongation after fracture at 2,000 DEG C is larger than or equal to 15%.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a high-performance tungsten alloy rod and a preparation method thereof. Background technique [0002] With the continuous development of aerospace high-temperature applications, the requirements for high-temperature strength, ablation resistance, and high-temperature creep resistance of materials are getting higher and higher. Tungsten alloy has a series of excellent properties such as high melting point, high strength, high hardness, high plasticity, high recrystallization temperature, high resistivity, low vapor pressure, low electron work function and low plastic-brittle transition temperature; especially important, Tungsten alloy has excellent high-temperature mechanical properties, making it the first choice for ultra-high temperature structural materials used at 2000 °C. [0003] At present, the research on tungsten-rhenium alloy mainly focuses on the...

Claims

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Application Information

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IPC IPC(8): C22C27/04B22F3/10B22F3/24C22F1/18B22F5/00
CPCB22F3/1007B22F3/24B22F5/00B22F2998/10C22C27/04C22F1/18B22F1/0003B22F3/02B22F2003/248
Inventor 董帝刘国辉熊宁王承阳苏国平
Owner 安泰天龙钨钼科技有限公司
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