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Preparation method of tungsten carbide composite powder

A composite powder, tungsten carbide technology, applied in the coating and other directions, can solve the problems of WC being easily polluted, complex process, environmental pollution, etc., and achieve the effects of easy control, simple process, and dense film formation

Inactive Publication Date: 2013-03-20
CHINA NAT ACAD NANOTECH & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of tungsten carbide composite powder, which refers to a method of coating metal powder such as Co or Ni on WC powder, which is aimed at some problems existing in the current WC composite powder and its preparation method , such as the uniformity of mixing WC powder and Co powder, the tightness of the combination, the easy decarburization of WC during the heating process, and the complex process of Co-coated WC in the chemical method, the WC is easily polluted, and there are problems such as environmental pollution during the production process. A proposed physical method for metal coating WC powder using magnetron sputtering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: a kind of preparation method of tungsten carbide composite powder is characterized in that concrete steps are as follows:

[0017] (1) Use a microparticle magnetron sputtering apparatus to coat the powder surface, using DC sputtering mode;

[0018] (2) Get 100 grams of pure WC powder as the coated base material and place it in the sample box of the sputtering instrument, and use the metal Co to be coated as the sputtering target;

[0019] (3) When the vacuum degree in the vacuum chamber reaches 1.0×10 -3 Pa, fill the vacuum chamber with high-purity argon, set the working pressure in the vacuum chamber to 0.3Pa, and the substrate temperature to 20°C;

[0020] (4) Open the swing device and the ultrasonic vibration device of the sample box, the ultrasonic vibration frequency is 10kHz, the vibration power is 5W, and the swing frequency of the sample box is 3 times / min;

[0021] (5) Turn on the sputtering power supply, adjust the sputtering current to 0.2A, t...

Embodiment 2

[0025] Embodiment 2: a kind of preparation method of tungsten carbide composite powder is characterized in that concrete steps are as follows:

[0026] (1) Use a microparticle magnetron sputtering instrument for powder surface coating, using radio frequency sputtering mode;

[0027] (2) Get 50 grams of pure WC powder as the coated base material and place it in the sample box of the sputtering instrument, and use the metal Ni to be coated as the sputtering target;

[0028] (3) When the vacuum degree in the vacuum chamber reaches 4.0×10 -3 Pa, fill the vacuum chamber with high-purity argon, set the working pressure in the vacuum chamber to 5.0Pa, and the substrate temperature to 300°C;

[0029] (4) Open the swing device and the ultrasonic vibration device of the sample box, the ultrasonic vibration frequency is 30kHz, the vibration power is 40W, and the swing frequency of the sample box is 20 times / min;

[0030] (5) Turn on the sputtering power supply, adjust the sputtering cu...

Embodiment 3

[0034] Embodiment 3: a kind of preparation method of tungsten carbide composite powder is characterized in that concrete steps are as follows:

[0035] (1) Use a microparticle magnetron sputtering apparatus to coat the powder surface, using pulse sputtering mode;

[0036] (2) Get 80 grams of pure WC powder as the coated base material and place it in the sample box of the sputtering instrument, and use the metal Cu to be coated as the sputtering target;

[0037] (3) When the vacuum degree in the vacuum chamber reaches 3.0×10 -3 Pa, fill the vacuum chamber with high-purity argon, set the working pressure in the vacuum chamber to 2.0Pa, and the substrate temperature to 100°C;

[0038] (4) Open the swing device and the ultrasonic vibration device of the sample box, the ultrasonic vibration frequency is 20kHz, the vibration power is 20W, and the swing frequency of the sample box is 10 times / min;

[0039] (5) Turn on the sputtering power supply, adjust the sputtering current to 0....

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Abstract

The invention discloses a preparation method of tungsten carbide composite powder. The tungsten carbide composite powder is prepared by microparticle magnetron sputtering equipment. The preparation method is characterized in that tungsten carbide powder is used as a matrix; a coated metal is used as a target material; through direct current, radio frequency or pulsed sputtering, the metal of the target material is sputtered and deposited on surfaces of the tungsten carbide powder to form uniform and compact metal films; and the uniform and compact metal films closely coat tungsten carbide particles so that metal-coated tungsten carbide powder is obtained. The preparation method has the advantages that processes are simple; control is easy; stability is high; pollution on the environment is avoided; a compact and continuous film is obtained; adhesion is strong; through a change of components of the target material, coating by films having different components is realized; the problem of infiltration of interfaces between tungsten carbide particles and a metal is solved; and decarburization in tungsten carbide powder heating is inhibited.

Description

(1) Technical field: [0001] The invention relates to the field of composite powder preparation, in particular to a preparation method of tungsten carbide (WC) composite powder. (two) background technology: [0002] WC / Co cemented carbide and wear-resistant coating have good hardness and toughness, and are widely used in aviation, aerospace, metallurgy, machinery, military and other fields. The composition, grain size, particle size, structure and other factors of WC / Co alloy powder are the key factors affecting the performance of subsequent products. Whether the components in WC / Co powder such as WC, Co, and other components such as grain inhibitors are uniformly dispersed, whether the combination of WC and Co is tight, and whether the powder is polluted during the preparation process all greatly affect the WC / Co coating. Or the performance of cemented carbide. At present, the production process of cemented carbide is basically the process of carbonizing tungsten powder, t...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C29/08B22F1/02C23C14/14C23C14/35
Inventor 范洪涛王莉翟勇
Owner CHINA NAT ACAD NANOTECH & ENG
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