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Tungsten alloy and preparation method thereof

A technology of tungsten alloy and alloy elements, which is applied in the field of tungsten alloy and its preparation, can solve the problems of insufficient solid solution strengthening, incomplete solid solution of alloy elements, low plasticity and toughness, etc., to achieve increased strength and hardness, improved plasticity and Toughness, the effect of improving the plasticity and toughness of alloys

Active Publication Date: 2018-01-05
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the alloy elements in the existing tungsten alloy cannot be completely solid-dissolved into the tungsten matrix, the solid-solution strengthening is insufficient, and the plasticity and toughness are low. A tungsten alloy with high strength, high hardness, and high plasticity, which exhibits intrinsic plasticity, and provides its preparation method

Method used

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  • Tungsten alloy and preparation method thereof
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  • Tungsten alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Mount the metal substrate on the working platform of the fiber laser (see figure 1 ), and at the same time control the gap between the powder spreading scraper and the metal substrate to be 30 μm, take polygonal tungsten powder particles with no impurities and oxygen adsorption on the surface, and the particle size of the tungsten powder is 36 μm.

[0049] Use the induction plasma spheroidization equipment to spheroidize the tungsten powder, the voltage is 8.5kV, the current is 4.5A, the spheroidization power is 35kW, the powder feeding speed is 1rpm, the spherical powder see figure 2 , The spherical powder particle size is 28μm.

[0050] take as figure 2 The spherical tungsten powder shown is to which 6% by weight of tantalum is added as an alloying element, and the two powders are mechanically mixed to obtain tungsten alloy powder. Fill the mixed tungsten alloy powder into the powder silo.

[0051] Seal the forming cavity, evacuate to a relative vacuum of -90KPa,...

Embodiment 2

[0055] Mount the metal substrate on the working platform of the fiber laser (see figure 1 ), and at the same time control the gap between the powder spreading scraper and the metal substrate to be 60 μm, take polygonal tungsten powder particles with no impurities and oxygen adsorption on the surface, and the particle size of the tungsten powder is 40 μm.

[0056] The powder is spheroidized by induction plasma spheroidization equipment, the voltage is 10kV, the current is 4.5A, the spheroidization power is 38kW, the powder feeding speed is 1.5rpm, the spheroidized powder has a particle size of 25μm.

[0057] Spherical tungsten powder is taken, 10% by weight of molybdenum is added thereto as an alloying element, and the two powders are mechanically mixed to obtain tungsten alloy powder. Fill the tungsten alloy powder into the powder silo.

[0058] Seal the forming cavity, evacuate to a relative vacuum of -100KPa, and input protective gas argon into the forming cavity; repeatedl...

Embodiment 3

[0062] Mount the metal substrate on the working platform of the fiber laser (see figure 1 ), and at the same time control the gap between the powder spreading scraper and the metal substrate to be 80 μm, take polygonal tungsten powder particles with no impurities and oxygen adsorption on the surface, and the particle size of the tungsten powder is 45 μm.

[0063] The powder is spheroidized by induction plasma spheroidization equipment, the voltage is 9.5kV, the current is 6A, the spheroidization power is 36kW, the powder feeding speed is 2rpm, the spheroidized powder has a particle size of 20μm.

[0064] Spherical tungsten powder is taken, 10% by weight of niobium is added thereto as an alloying element, and the two powders are mechanically mixed to obtain tungsten alloy powder. Fill the tungsten alloy powder into the powder silo.

[0065] Seal the forming cavity, evacuate to a relative vacuum of -80KPa, and input protective gas argon into the forming cavity; repeatedly vacuu...

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Abstract

The invention relates to a tungsten alloy and a preparation method thereof. The alloy is composed of a tungsten matrix and alloy elements. The solid solution of alloying elements into the tungsten matrix, based on the XRD test, can give full play to the solid solution strengthening effect, improve the strength and hardness of the alloy, and improve the plasticity and toughness of the alloy at the same time. The invention also provides a 3D pure shape preparation method of this novel tungsten alloy part.

Description

technical field [0001] The invention relates to a tungsten alloy and a preparation method thereof, belonging to the field of materials. Background technique [0002] Tungsten is a refractory metal with high melting point, high density, high temperature strength and high hardness. It is widely used in medical, aerospace, defense weapons, fusion energy and other fields. However, pure tungsten has high hardness, becomes brittle at room temperature, is difficult to process directly, and has low ductility. It is this lack of ductility at room temperature that limits the further application of tungsten in industry. [0003] Improving the toughness of metal materials can start from two aspects. On the one hand, it is dealt with during alloy design. The most common research focus is to modify the apparent characteristics of the alloy (for example, grain size, reinforcement phase distribution, etc.), which can passivate the crack before the crack propagates and causes macroscopic f...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/04G21F1/08
Inventor 王殿政李恺伦余晨帆马静刘伟沈志坚
Owner TSINGHUA UNIV
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