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High-density tungsten alloy and preparation method thereof

A high specific gravity, tungsten alloy technology, applied in the field of metal materials, can solve the problems of uneven distribution of strengthening phase, segregation of grain boundaries, and excessively large dispersed phase of tungsten alloy grains, and achieve the effect of improving the distribution of internal elements

Active Publication Date: 2016-03-30
HENAN UNIV OF SCI & TECH
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Problems solved by technology

The traditional tungsten alloy preparation process is solid + solid (liquid) powder making, pressing, and sintering, but the tungsten alloy produced by this process generally has uneven distribution of strengthening phase in the tungsten powder, resulting in the dispersion of tungsten alloy grains. The phase is too large and there are problems of grain boundary segregation, and the sintered tungsten alloy also has defects such as low hardness, low plasticity, and poor impact toughness.

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  • High-density tungsten alloy and preparation method thereof

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Effect test

Embodiment 1

[0030] High specific gravity tungsten alloy, by mass percentage, the composition of the alloy is as follows:

[0031] Tungsten (W) 96.0%,

[0032] Zirconia (ZrO 2 )4.0%,

[0033] and unavoidable impurities.

[0034] The preparation method of high specific gravity tungsten alloy (100kg) (process flow chart sees figure 1 ), including the following steps:

[0035] 1) Preparation of composite tungsten powder

[0036] Dissolve 131.59kg of ammonium metatungstate and 13.94kg of zirconium nitrate in water respectively, and then mix the two solutions evenly to obtain a mixed solution; evaporate the mixed solution to dryness, and calcinate the obtained dry powder at 500°C for 4 hours; put the calcined product in The push rod reduction furnace is divided into two stages of reduction. The temperature of the first stage is 600°C, and the reduction time is 1 hour. The temperature of the second stage is 950°C, and the reduction time is 3.5 hours. After reduction, the compound tungsten i...

Embodiment 2

[0050] High specific gravity tungsten alloy, by mass percentage, the composition of the alloy is as follows:

[0051] Tungsten (W) 98.5%,

[0052] Zirconia (ZrO 2 )1.5%,

[0053] and unavoidable impurities.

[0054] The preparation method of high specific gravity tungsten alloy (100kg), comprises the following steps:

[0055] 1) Preparation of composite tungsten powder

[0056] Dissolve 135.01kg of ammonium metatungstate and 5.23kg of zirconium nitrate in water respectively, and then mix the two solutions evenly to obtain a mixed solution; evaporate the mixed solution to dryness, and calcinate the obtained dry powder at 400°C for 5 hours; put the calcined product in The push rod reduction furnace is divided into two stages of reduction. The temperature of the first stage of reduction is 500°C, and the reduction time is 2 hours. The temperature of the second stage of reduction is 850°C, and the reduction time is 4 hours. After reduction, it passes through a 200-mesh screen ...

Embodiment 3

[0070] High specific gravity tungsten alloy, by mass percentage, the composition of the alloy is as follows:

[0071] Tungsten (W) 98.0%,

[0072] Zirconia (ZrO 2 )2.0%,

[0073] and unavoidable impurities.

[0074] The preparation method of high specific gravity tungsten alloy (100kg), comprises the following steps:

[0075] 1) Preparation of composite tungsten powder

[0076] Dissolve 134.33kg of ammonium metatungstate and 6.97kg of zirconium nitrate in water respectively, and then mix the two solutions evenly to obtain a mixed solution; evaporate the mixed solution to dryness, and calcinate the obtained dry powder at 450°C for 5 hours; put the calcined product in The push rod reduction furnace is divided into two stages of reduction. The temperature of the first stage of reduction is 550°C, and the reduction time is 1.5 hours. The temperature of the second stage of reduction is 900°C, and the reduction time is 4 hours. pink;

[0077] 2) Ball milling, pressing molding ...

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Abstract

The invention discloses a high-density tungsten alloy and a preparation method thereof, belonging to the field of metal materials. The tungsten alloy comprises the following components in percentage by mass: 95.0-99.0 percent of tungsten, 1.0-5.0 percent of zirconium oxide and inevitable impurities. The preparation method comprises the following steps: (1) respectively dissolving ammonium metatungstate and zirconium nitrate in water for mixing; drying the mixed liquid, and thus obtaining powder; calcining and reducing the powder, and thus obtaining composite tungsten powder; (2) after ball milling, carrying out compression molding and sintering for the composite tungsten powder, and thus obtaining a sintering billet; after dehydrogenation, carrying out deformation and thermal treatment for the sintering billet, and thus obtaining the high-density tungsten alloy. According to the preparation method, a ZrO2 strengthening phase is added in a tungsten matrix through a liquid-liquid doping method, and two segments of sintering processes, dehydrogenation and rotary swaging treatment are adopted to prepare the tungsten alloy. The preparation method solves the problems of uneven distribution of the strengthening phase of the traditional tungsten alloy, hydrogen embrittlement and low sintered density and provides a new direction for the application and development of the tungsten alloy in the new field.

Description

technical field [0001] The invention relates to a high specific gravity tungsten alloy and a preparation method of the high specific gravity tungsten alloy, belonging to the field of metal materials. Background technique [0002] High-density tungsten alloy is a high-density, high-strength, and high-ductility material. However, due to the low-temperature brittleness, high ductile-brittle transition temperature, and low recrystallization temperature of tungsten, the wider application of tungsten is limited. Oxide (ZrO 2 , La 2 o 3 , Y 2 o 3 ) has the characteristics of high melting point, good high temperature stability, and low solid solubility in the tungsten matrix, so it is often used as the dispersion strengthening phase of tungsten. The traditional tungsten alloy preparation process is solid + solid (liquid) powder making, pressing, and sintering, but the tungsten alloy produced by this process generally has uneven distribution of strengthening phase in tungsten po...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C32/00C22C1/04B22F9/22C22F1/18
CPCB22F9/22B22F2998/10C22C1/045C22C27/04C22C32/0031C22F1/18B22F3/02B22F2003/145B22F3/10B22F3/24B22F2003/248
Inventor 徐流杰魏世忠肖方闹刘伟李秀青李继文游龙张国赏潘昆明徐锐
Owner HENAN UNIV OF SCI & TECH
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