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A kind of tungsten alloy and preparation method thereof

A technology of tungsten alloy and tungsten powder, applied in the field of tungsten alloy and its preparation, can solve the problems of inability to improve high temperature strength and toughness, inability to apply high temperature field, compactness defect of tungsten alloy, etc., to improve performance, improve compactness and stability The effect of improving the bonding force of grain boundaries

Active Publication Date: 2020-10-09
TAIZHOU HUACHENG TUNGSTEN & MOLYBDENUM MFR
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Problems solved by technology

[0003] However, in addition to the shortcomings of low temperature brittleness and recrystallization brittleness, metal tungsten also has the disadvantages of grain growth and recrystallization embrittlement at high temperatures, low high temperature strength, and the high hardness and high ductile-brittle transition temperature of tungsten. Defects that make it difficult to process
[0004] At present, the method of adding alloying elements is usually used to improve the processing performance, but the added alloying elements cannot be completely dissolved with tungsten to form a low-melting point phase, which makes it unable to be used in high-temperature fields, and cannot improve high-temperature strength and toughness at the same time, and now There are more obvious defects in the compactness of tungsten alloys

Method used

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preparation example Construction

[0033] The present invention also provides a kind of preparation method of tungsten alloy, comprises the following steps:

[0034] (1) According to the mass percentage of 0.35-0.85% of molybdenum carbonyl powder, 5.5-7.5% of zirconium carbide or titanium carbide particles, 0.2-1.5% of rare earth metal oxide particles, and the rest are tungsten powder, and the ratio is carried out;

[0035] (2) Use induction plasma powder to spheroidize tungsten powder to obtain spherical tungsten powder, and mechanically mix spherical tungsten powder with molybdenum carbonyl powder, zirconium carbide or titanium carbide, and rare earth metal oxide particles to obtain tungsten alloy powder;

[0036] (3) Place the tungsten alloy powder in a sealed cavity in a vacuum state, and use nitrogen as a protective gas so that the oxygen content in the sealed cavity is lower than 100ppm;

[0037] (4) The laser is used to selectively melt the powder in a specific area to make it bonded and formed.

[0038...

Embodiment 1

[0043] (1) Proportioning is carried out according to 0.35% molybdenum carbonyl powder by mass percentage, 5.5% zirconium carbide or titanium carbide particles, 0.2% rare earth metal oxide particles, and the rest are tungsten powder;

[0044] (2) Use induction plasma powder to spheroidize tungsten powder to obtain spherical tungsten powder, and mechanically mix spherical tungsten powder with molybdenum carbonyl powder, zirconium carbide or titanium carbide, and rare earth metal oxide particles to obtain tungsten alloy powder;

[0045] (3) Place the tungsten alloy powder in a sealed cavity in a vacuum state, and use nitrogen as a protective gas so that the oxygen content in the sealed cavity is lower than 100ppm;

[0046] (4) Use laser to selectively melt the powder in a specific area to bond and shape it to obtain tungsten alloy.

[0047] The obtained tungsten alloy was tested, and its Vickers hardness was 6.0GPa, and its density was 18.98g / cm 3 , The tensile strength is 956MP...

Embodiment 2

[0049] (1) Proportioning is carried out according to 0.85% molybdenum carbonyl powder by mass percentage, 7.5% zirconium carbide or titanium carbide particles, 1.5% rare earth metal oxide particles, and the rest are tungsten powder;

[0050] (2) Use induction plasma powder to spheroidize tungsten powder to obtain spherical tungsten powder, and mechanically mix spherical tungsten powder with molybdenum carbonyl powder, zirconium carbide or titanium carbide, and rare earth metal oxide particles to obtain tungsten alloy powder;

[0051] (3) Place the tungsten alloy powder in a sealed cavity in a vacuum state, and use nitrogen as a protective gas so that the oxygen content in the sealed cavity is lower than 100ppm;

[0052](4) Use laser to selectively melt the powder in a specific area to bond and shape it to obtain tungsten alloy.

[0053] The obtained tungsten alloy was tested, and its Vickers hardness was 5.9GPa, and its density was 19.32g / cm 3 , The tensile strength is 1039MP...

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Abstract

The invention discloses a novel tungsten alloy. The novel tungsten alloy is mainly composed of reduced tungsten powder, and further contains the following components in percentage by mass: 0.35-0.85%of molybdenum carbonyl powder, 5.5-7.5% of zirconium carbide or titanium carbide granules and 0.2-1.5% of rare-earth metallic oxide particles. The invention further discloses a preparation method of the tungsten alloy. The raw materials are treated by adopting induction plasma powder spheroidization, the method is simple, and the prepared tungsten alloy has excellent overall properties such as plasticity, strength, hardness and density.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a tungsten alloy and a preparation method thereof. Background technique [0002] Tungsten alloy is an alloy composed of tungsten as the matrix and other elements. Among metals, tungsten has the highest melting point, good high temperature strength and creep resistance, thermal conductivity, electrical conductivity and electron emission performance, and has a large specificity. In addition to being widely used in the manufacture of hard alloys and alloy additives, tungsten and its alloys are widely used. In the electronics and electric light source industries, it is also used in the aerospace, foundry, weapons and other departments to make rocket nozzles, die-casting molds, armor-piercing bullet cores, contacts, heating elements and heat shields, etc. [0003] However, in addition to the shortcomings of low temperature brittleness and recrystallization brittleness, metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C32/00C22C1/05
CPCC22C1/05C22C27/04C22C32/0052
Inventor 徐文进项红霞
Owner TAIZHOU HUACHENG TUNGSTEN & MOLYBDENUM MFR
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