Superfine w-cu composite powder and preparation method thereof

A composite powder and w-cu technology, which is applied in the field of ultrafine W-Cu composite powder and its preparation, can solve the problem that the reaction temperature and reaction time of the precursor powder have a great influence, the powder is easy to form agglomerates, and it is difficult to produce in batches, etc. problem, to achieve the effect of not easy to grow abnormally grains, small grain size, and controllable composition ratio

Active Publication Date: 2020-11-13
CHONGYI ZHANGYUAN TUNGSTEN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because tungsten and copper powders are insoluble in each other and have a large contact angle, they can only form a pseudo-alloy. The W-Cu composite material prepared by traditional powder metallurgy and infiltration method has poor density, which is difficult to meet the requirements of modern materials. Require
The existing methods for preparing ultrafine W-Cu composite powders at home and abroad, or the ball milling time is long and contains impurity metal elements, and the obtained powder is easy to form agglomerates, and the wall sticking phenomenon is serious; or the prepared precursor powder is affected by the reaction temperature and reaction time Larger, the reduction control is more difficult; or the process is complicated, it is difficult to produce in batches

Method used

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  • Superfine w-cu composite powder and preparation method thereof
  • Superfine w-cu composite powder and preparation method thereof
  • Superfine w-cu composite powder and preparation method thereof

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preparation example Construction

[0048] According to the method for preparing ultrafine W-Cu composite powder according to the embodiment of the present invention, the copper salt and zinc salt are reacted with sodium tungstate to obtain the copper tungstate-zinc tungstate composite powder precursor, and then the tungstate can be hydrogenated by hydrogen. The characteristics of reduction, the precursor is placed in a hydrogen atmosphere for the reduction reaction, and the reduction temperature is controlled to be between the volatilization temperature of elemental zinc and elemental copper, so that the elemental zinc generated by reduction can be vaporized and smoothly discharged, thereby obtaining super Fine W-Cu composite powder. In addition, because the grain size of the precursor is small and uniformly distributed, the precursor is not prone to abnormal grain growth during the hydrogen reduction process, and the obtained ultrafine W-Cu composite powder can maintain the sub-micron grain size. Thus, the meth...

Embodiment 1

[0055] Take Na 2 WO 4 ·2H 2 O 99.59g, CuSO 4 ·5H 2 O 54.16g, Zn(NO 3 ) 2 ·6H 2 O 24.72g, add 300mL deionized water to make a mixed solution, put it in an autoclave for reaction, the reaction temperature is 170℃, the reaction time is 4h, the stirring speed is 400r / min, the sample after the reaction is filtered, cleaned and dried. The dried copper tungstate-zinc tungstate composite powder precursor is obtained. Place the precursor in an atmosphere furnace and reduce it under a hydrogen atmosphere. The reduction temperature is 900°C and the reduction time is 2h to obtain ultrafine W-20wt.%Cu composite powder. The SEM picture is as follows Figure 4 As shown, the XRD pattern is as Figure 5 Shown.

Embodiment 2

[0057] Take Na 2 WO 4 ·2H 2 O 99.59g, CuSO 4 ·5H 2 O 24.12g, Zn(NO 3 ) 2 ·6H 2 O 61.07g, add 300mL deionized water to make a mixed solution, put it in an autoclave for reaction, the reaction temperature is 180℃, the reaction time is 3h, the stirring speed is 400r / min, the sample after the reaction is filtered, cleaned and dried, The dried copper tungstate-zinc tungstate composite powder precursor is obtained. The precursor is placed in an atmosphere furnace and reduced under a hydrogen atmosphere at a reduction temperature of 1000° C. and a reduction time of 1 h to obtain ultrafine W-10 wt.% Cu composite powder.

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Abstract

The invention discloses a kind of superfine W-Cu composite powder and a preparation method thereof. The method comprises the steps of (1) mixing a copper salt solution, a zinc salt solution and a sodium tungstate solution to obtain a mixed solution; (2) sending the mixed solution into a high-pressure reaction kettle to be subjected to stirring and reaction to obtain a reaction post-solution; (3) conducting filtering and cleaning on the reaction post-solution to obtain a copper tungstate and zinc tungstate composite powder precursor and filtered fluid; (4) conducting drying treatment on the copper tungstate and zinc tungstate composite powder precursor to obtain the dried composite powder precursor; and (5) conducting reduction treatment on the dried composite powder precursor under the hydrogen atmosphere to obtain the superfine W-Cu composite powder. Through the method, the W-Cu composite powder with the high purity, small grain size and controllable W-Cu composition ratio can be prepared. Meanwhile, the method is simple in process, mass production can be realized, and the method has good application prospects.

Description

Technical field [0001] The present invention belongs to the field of metal composite powder preparation. Specifically, the present invention relates to ultrafine W-Cu composite powder and a preparation method thereof. Background technique [0002] Tungsten has the properties of high melting point, high density, welding resistance, electrical corrosion resistance, and good high temperature strength. Copper has high thermal and electrical conductivity, good ductility, and easy processing. Parts made by alloying the two can be It has the properties of tungsten and copper and is widely used in military materials and electronic materials. However, because the tungsten and copper powders do not dissolve each other and the contact angle is large, the two can only form a pseudo-alloy. The W-Cu composite materials prepared by traditional powder metallurgy and infiltration methods have poor density, which has been difficult to meet the requirements of modern materials Claim. Existing met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22B22F1/00
CPCB22F1/0007B22F9/22
Inventor 黄泽辉邓登飞李倩叶艳君
Owner CHONGYI ZHANGYUAN TUNGSTEN
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