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A rare earth oxide-doped tungsten-copper alloy composite material and its preparation method

A technology of rare earth oxides and composite materials, which is applied in the preparation of rare earth oxide doped tungsten copper alloy composite materials, and in the field of rare earth oxide doped tungsten copper alloy composite materials, can solve the problem that it is difficult to obtain dense tungsten copper alloy, agglomerated , grain growth and other issues, to achieve the effect of improving compactness, improving sintering performance, toughness and thermal conductivity

Inactive Publication Date: 2018-04-20
HENAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the hydrogen reduction process of the above-mentioned tungsten oxide and copper oxide composite powder, the problems of grain growth and agglomeration are prone to occur. Even if a well-dispersed precursor can be obtained, it is difficult to obtain a dense tungsten-copper alloy in the end.

Method used

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  • A rare earth oxide-doped tungsten-copper alloy composite material and its preparation method
  • A rare earth oxide-doped tungsten-copper alloy composite material and its preparation method
  • A rare earth oxide-doped tungsten-copper alloy composite material and its preparation method

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preparation example Construction

[0047] The preparation method of the rare earth oxide-doped tungsten-copper alloy composite material of the present invention specifically comprises the following steps:

[0048] 1) Use tungstic acid or soluble tungstate, copper nitrate and rare earth nitrate as raw materials to prepare aqueous solutions respectively, then add an appropriate amount of ammonia water to the copper nitrate solution, and add an appropriate amount of weak acid to the rare earth nitrate solution;

[0049] The add-on of described ammoniacal liquor is: NH 3 The molar ratio to copper nitrate is 2 to 2.5:1, and the concentration of ammonia water used is 15mol L -1 The amount of the organic weak acid added is: the molar ratio of the organic weak acid to the rare earth nitrate is 2 to 3:1; the organic weak acid is added in the form of an acid solution, and the concentration of the organic weak acid in the acid solution is 0.2mol L -1 ;

[0050] The soluble tungstate is one or more of ammonium paratungst...

Embodiment 1

[0058] In the preparation method of the lanthanum oxide-doped tungsten-copper alloy composite material of embodiment 1, the scanning electron microscope picture of the hydrothermal synthesis product obtained in step 3) is as follows figure 1 Shown; Step 4) gained roasting product scanning electron microscope picture is as figure 2 Shown; Step 5) the scanning electron microscope picture of gained lanthanum oxide doped tungsten-copper alloy composite material is as image 3 As shown, the X-ray diffraction spectrum is shown as Figure 4 shown.

[0059] From Figure 1-4 It can be seen that the particle size of the hydrothermal reaction product is fine, the oxidized composite powder is dispersed after roasting, the reduced powder particles are spherical, and the particle size reaches the nanometer level.

Embodiment 6

[0060] In the preparation method of the yttrium oxide-doped tungsten-copper alloy composite material of embodiment 6, the scanning electron microscope image of the hydrothermal synthesis product obtained in step 3) is as follows Figure 5 Shown; Step 4) gained roasting product scanning electron microscope picture is as Figure 6 Shown; Step 5) the scanning electron microscope picture of gained yttrium oxide doped tungsten-copper alloy composite material is as Figure 7 As shown, the EDS energy spectrum is shown as Figure 8 shown.

[0061] From Figure 5-8 It can be seen that the particle size of the hydrothermal reaction product is fine, the oxidized composite powder is dispersed after roasting, the reduced powder particles are spherical, and the particle size reaches the nanometer level.

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Abstract

The invention discloses a rare-earth oxide-doped tungsten-copper alloy composite material and a preparation method thereof. The composite material is composed of the following components in mass percent: 14%-39.9% of copper and 0.1%-3.0% of rare-earth oxide , the balance being tungsten and unavoidable impurities. The rare-earth oxide-doped tungsten-copper alloy composite material of the present invention is composed of tungsten, copper and rare-earth oxide, and the rare-earth oxide is added into the tungsten-copper alloy as the second phase doping, which significantly improves the sintering performance of the tungsten-copper alloy. Coated with copper to form a well-developed crystal around the rare earth oxide, the tungsten element and copper element have good wettability under the action of the rare earth oxide, and the molecular level mixing of tungsten and copper is realized, which greatly improves the The compactness of tungsten-copper alloy significantly improves the strength, toughness and thermal conductivity of the final tungsten-copper alloy.

Description

technical field [0001] The invention belongs to the technical field of tungsten-copper alloy composite materials, in particular to a rare-earth oxide-doped tungsten-copper alloy composite material, and also relates to a preparation method of the rare-earth oxide-doped tungsten-copper alloy composite material. Background technique [0002] Tungsten-copper alloy has the advantages of high strength, high hardness, arc corrosion resistance and fusion welding resistance, so it is widely used in resistance welding, electrical contact materials, and plasma electrode materials for EDM. Specifically, it can be used as an important material for high-voltage switch electrical contacts, lead frames in large-scale integrated circuits, thermal deposition sheets in electronic devices such as solid-state microwave tubes, and rocket irrigation throat linings for short-term high-temperature and thermal erosion resistance in aerospace technology. [0003] At present, tungsten-copper alloys are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04B22F1/00B22F9/22
Inventor 李继文王展万成赵清马窦琴张国赏徐流杰魏世忠
Owner HENAN UNIV OF SCI & TECH
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