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Chromium/diamond composite deposite and preparation method thereof

A composite coating and diamond technology, applied in coatings, electrolytic coatings, etc., can solve the problems of difficult diamond deposition and low current efficiency, and achieve the effects of high volume concentration, extended range, and improved shear resistance

Inactive Publication Date: 2008-09-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current efficiency is too low (8-16%) during chromium electroplating, and a large amount of hydrogen escapes from the electrode, making it difficult for diamond to be combined with chromium for electrodeposition.

Method used

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  • Chromium/diamond composite deposite and preparation method thereof
  • Chromium/diamond composite deposite and preparation method thereof
  • Chromium/diamond composite deposite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Take CrCl 3 ·6H 2 O 63.6g, HCOOK 48g, NH 4 Cl 33.6 g, KCl 45.6 g, H 3 BO 3 24 grams, NH 4 6 grams of Br, 0.6ml of additives; the above-mentioned components are dissolved in distilled water in order, and the next component is added after each component has been dissolved to form a 600ml trivalent chromium electroplating solution. The chromium electroplating solution is divided into the bottom plating tank, the upper sand plating tank and the reinforcement plating tank, and each electroplating tank is 200ml trivalent chromium plating solution; Boil in a fume hood for 45 minutes, rinse with distilled water until neutral, take 10 g and put it into the upper sand plating tank filled with trivalent chromium plating solution, and soak for 24 hours. The above-mentioned additive is a mixed solution of 5% OP emulsifier aqueous solution and 10% glycerol aqueous solution at a volume ratio of 1:1.

[0032](2) Use a copper sheet of Φ=20mm as the workpiece, protect the non-...

Embodiment 2

[0040] (1) Take CrCl 3 ·6H 2 O 108g, HCOOK 90g, NH 4 Cl 58.5g, KCl 81g, H 3 BO 3 45 g, NH 4 10.8 grams of Br, 1.33ml of additives; Dissolve the above components in distilled water in order, and add the next component after each component has been dissolved to form a 900ml trivalent chromium electroplating solution. The chromium electroplating solution is divided into the bottom plating tank, the upper sand plating tank and the reinforcement plating tank, and each electroplating tank is 300ml trivalent chromium plating solution; Boil in a fume hood for 30 minutes, rinse with distilled water until neutral, take 10g and put it into the upper sand plating tank, soak for 20 hours. The above additive is a mixed solution of 6% OP emulsifier aqueous solution and 8% glycerol aqueous solution at a volume ratio of 0.4:1.

[0041] (2) Use Φ=20mm stainless steel as the workpiece, protect the non-electroplated surface (back) with insulating varnish, and clean the stainless steel befor...

Embodiment 3

[0049] (1) Take CrCl 3 ·6H 2 O 81g, HCOOK 54g, NH 4 Cl 41.4g, KCl 54g, H 3 BO 3 27 grams, NH 4 7.2 grams of Br, 0.45ml of additives; Dissolve the above components in distilled water in order, and add the next component after each component has been dissolved to form a 900ml trivalent chromium electroplating solution. The chromium electroplating solution is divided into the bottom plating tank, the upper sand plating tank and the reinforcement plating tank, and each electroplating tank is 300ml trivalent chromium plating solution; Boil in a fume hood for 60 minutes, rinse with distilled water until neutral, take 12g and put it into the upper sand plating tank, soak for 30 hours. The above-mentioned additive is a mixed solution of 4% OP emulsifier by volume fraction and 12% glycerol aqueous solution with a volume ratio of 2:1.

[0050] (2) Use Φ = 20mm hard alloy as the workpiece, protect the non-electroplated surface (back side) with insulating varnish, mechanically grin...

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Abstract

The invention provides a chromium / diamond composite clad layer, the preparation method comprising the steps of: depositing a layer of chromium on surface of a work-piece by electroplating, and then depositing a layer of chromium / diamond composite clad layer, finally depositing a chromium back-up coat. The chromium / diamond composite clad layer produced by the method has 1 to 1.5um of chrome plating thickness of the under-plate; the total chrome plating thickness of the sad-feeding plate and the back-up plate is 80% to 90% of the diamond grains; the chromium / diamond composite clad layer has high volume concentration, which is dispersed evenly without crack on the surface, so as to prevent graphite catalytic element in the work-piece, such as Fe, Ni, Co, etc spreading to diamond interface; the chromium / diamond composite clad layer can be adopted as clad layer of CVD diamond; the deposited CVD diamond film is provided with mosaic structured interface, so as to greatly improve CVD diamond film / foundation interface bonding force.

Description

technical field [0001] The invention belongs to the technical field of diamond film technology and diamond composite electroplating, and in particular relates to a chromium / diamond composite coating and a preparation method thereof. Background technique [0002] The deposition of diamond films by CVD (Chemical Vapor Deposition, chemical vapor deposition) has reached the practical stage in terms of deposition speed and coating crystal quality. However, the poor bonding force between CVD diamond films and substrates affects the expansion of practical applications. The CVD diamond film is combined with common substrate materials (tungsten carbide, silicon wafer, molybdenum, etc.) in a planar manner, mainly by mechanical engagement. When the expansion coefficient difference between the diamond film and the substrate is large, the thicker diamond film will fall off from the substrate when it is cooled to room temperature after deposition; the tool with the diamond film deposited,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00C25D5/12C25D3/06
Inventor 邱万奇
Owner SOUTH CHINA UNIV OF TECH
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