A kind of preparation method of double-coated diamond powder

A diamond powder and diamond technology, applied in metal processing equipment, coating, liquid chemical plating, etc., can solve the problems of Diamond/Cu composite material machining difficulties, limited part shape complexity, uneven density of formed blanks, etc. Achieve the effect of overcoming machining difficulties, high production efficiency and uniform distribution

Active Publication Date: 2019-03-01
UNIV OF SCI & TECH BEIJING
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  • Description
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Problems solved by technology

Since this method uses powder metallurgy molding technology to prepare diamond preforms, the density of the preforms is not uniform, and the complexity of the shape of the parts is also greatly limited.
At the same time, due to the lack of moisture between diamond and Cu, it is difficult to achieve complete penetration even with various forms of pressurized infiltration techniques, often leaving a certain amount of pores, which is a fatal weakness for electronic packaging materials
Even if the preform passes through the degreasing process, there will still be a forming agent remaining in the diamond preform, which will reduce the performance of the material
In addition, the machining of Diamond / Cu composites with a high volume fraction in the matrix is ​​extremely difficult, which has become a bottleneck for the practical application of this material

Method used

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  • A kind of preparation method of double-coated diamond powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: the Cu-WC-Diamond double-coated diamond powder that the volume fraction of the copper-coated layer is 30% is prepared

[0016] Step 1: Weigh 10g of MBD6 diamond powder with an average particle size of 80μm, WO 3 19.32g of powder, 30g of mixed salt NaCl-KCl (molar ratio NaCl:KCl=1:1), mixed with a powder mixer for 0.5h, and the powder loading was 53vol.%.

[0017] Step 2: Heat the above-mentioned mixed powder to 900° C. for 2 hours in a rapid heating tube electric furnace, and pass an Ar atmosphere for protection during this period. Put the reaction product in the tube furnace into a beaker filled with alcohol, and use an ultrasonic cleaner to vibrate and clean, dry and sieve to obtain diamond powder coated with a WC layer on the surface.

[0018] Step 3: Weigh 8g of diamond powder coated with WC layer and place it in 0.4L of SnCl 2 (30g / L) deionized aqueous solution for surface sensitization, and then placed in 0.4L of PdCl 2 (0.25g / L) deionized aqueous...

Embodiment 2

[0019] Embodiment 2: the Cu-WC-Diamond double-coated diamond powder that the volume fraction of the copper-coated layer is 40% is prepared

[0020] Step 1: Weigh 10g of MBD8 diamond powder with an average particle size of 100μm, WO 3 38.64g of powder, 40g of mixed salt NaCl-KCl (molar ratio NaCl:KCl=1:1), mixed for 1h with a powder mixer, and the powder loading was 63vol.%.

[0021] Step 2: Heat the above-mentioned mixed powder to 950° C. for 1 hour in a rapid heating tube electric furnace, during which an Ar atmosphere is introduced for protection. Put the reaction product in the tube furnace into a beaker filled with alcohol, and use an ultrasonic cleaner to vibrate and clean, dry and sieve to obtain diamond powder coated with a WC layer on the surface.

[0022] Step 3: Weigh 8g of diamond powder coated with WC layer and place it in 0.4L of SnCl 2 (30g / L) deionized aqueous solution for surface sensitization, and then placed in 0.4L of PdCl2 (0.25g / L) deionized aqueous solu...

Embodiment 3

[0023] Embodiment 3: the Cu-WC-Diamond double-coated diamond powder with 50% Cu-WC-Diamond volume fraction is prepared

[0024] Step 1: Weigh 10g of MBD10 diamond powder with an average particle size of 120μm, WO 3 57.96g of powder, 50g of mixed salt NaCl-KCl (molar ratio NaCl:KCl=1:1), mixed with a powder mixer for 3h, and the powder loading was 73vol.%.

[0025] Step 2: Heat the above-mentioned mixed powder to 1000° C. for 0.5 h in a rapid heating tube electric furnace, during which an Ar atmosphere is introduced for protection. Put the reaction product in the tube furnace into a beaker filled with alcohol, and use an ultrasonic cleaner to vibrate and clean, dry and sieve to obtain diamond powder coated with a WC layer on the surface.

[0026] Step 3: Weigh 8g of diamond powder coated with WC layer and place it in 0.4L of SnCl 2 (30g / L) deionized aqueous solution for surface sensitization, and then placed in 0.4L of PdCl 2 (0.25g / L) deionized aqueous solution for surface ...

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Abstract

The invention belongs to the technical field of powder metallurgy, and relates to a method for preparing double-coated diamond powder. A layer of uniform WC is coated on the diamond surface by salt bath plating technology to improve the wettability of diamond and copper, and then electroless plating is used. The coating method continues to plate copper on the surface of the WC layer, by controlling the Cu in the plating solution 2+ content to control the thickness of the copper plating layer, thereby preparing a double-coated Cu-WC-Diamond powder with a copper volume fraction of 30-50vol.%. The powder can be directly pressed into (Diamond / Cu) composite parts, realizing the near-net shape of metal matrix composite parts with complex shapes. The advantage of the present invention is that Cu-WC-Diamond powder can be prepared by controlling the thickness of the copper plating layer, and the copper plating amount of the prepared Cu-WC-Diamond powder is the copper content of the Diamond / Cu composite material after pressing the powder. , so the diamond distribution of the prepared composite material is uniform, the bonding strength is high, and the performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy and provides a method for preparing double-coated Cu-WC-Diamond (diamond) powder. The powder can be directly pressed to form high-volume (Diamond / Cu) composite parts, eliminating the need for traditional The powder mixing step of preparing composite materials by powder metallurgy realizes the near-net shape of metal matrix composite parts with complex shapes. Background technique [0002] With the rapid development of the electronic information age, the requirements for the integration and operation speed of modern electronic components are getting higher and higher. Therefore, the development of a new generation of heat dissipation materials for electronic packaging has become an imperative trend. High-volume Diamond / Cu composites have excellent thermophysical comprehensive properties, especially high thermal conductivity (≥400W·m -1 ·K -1 ), and the thermal expansion coefficient mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/40C23C18/18C23C28/00B22F1/02
CPCC23C18/165C23C18/1893C23C18/405C23C28/322C23C28/341B22F1/17
Inventor 何新波潘彦鹏任淑彬吴茂张忍曲选辉
Owner UNIV OF SCI & TECH BEIJING
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