Gradient method preprocessing technique for depositing CVD diamond film on hard metal surface

A technology of surface deposition and diamond film, which is applied in metal material coating process, gaseous chemical plating, coating, etc., can solve the problem of uneven deposition and uneven deposition of Co on edges and sharp corners, affecting the cutting performance of tools, etc. problems, to achieve the effect of good combination performance, good quality, and easy cleaning

CN100543177CInactive Publication Date: 2009-09-23NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2009-09-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention aims at the present existing cemented carbide surface deposition CVD diamond film pretreatment process, the speed of removing Co on the edges and sharp corners is faster than the speed of removing Co on the surface, resulting in a decrease in the strength of the edges and sharp corners, which affects The performance of the product may even cause problems such as edge and sharp corner corrosion. A gradient method pretreatment process for depositing CVD diamond film on the surface of cemented carbide is invented. Its main process flow is: polishing (1)→cleaning (2)→etching WC(3)→cleaning(4)→first etching Co(5)→cleaning(6)→drying(7)→glue coating(8)→second etching Co(9) )→Cleaning (10)→Sol (11)→Planting (12), especially the gluing process ensures that the surface pretreatment of the cemented carbide meets the deposition requirements of the CVD diamond film, and at the same time makes the edge of the cemented carbide product The amount of Co removal at the sharp corners is basically the same as that on the surface, which ensures the strength of the edges and sharp corners and improves the performance of the CVD diamond film.
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Description

technical field

[0001] The invention relates to a pretreatment process before depositing a CVD diamond film on the surface of a hard alloy, especially a pretreatment process that can ensure the strength of edges and sharp corners to improve the adhesion performance of the CVD diamond film, specifically a pretreatment process A gradient pretreatment process for depositing a CVD diamond film on the surface of a cemented carbide. Background technique

[0002] At present, the mechanical, thermal, acoustic, electrical, optical and chemical properties of chemical vapor deposition (CVD) diamond have reached or approached those of natural diamond, and have broad application prospects in today's high-tech fields. As a widely used wear-resistant material, cemented carbide is widely used in many industrial fields. Depositing a layer of CVD diamond coating on the surface of cemented carbide products can further improve the wear resistance of cemented carbide products. Co in cemented c...

Examples

Embodiment Construction

[0017] The present invention will be further described below in conjunction with embodiment.

[0018] A gradient method pretreatment process for depositing CVD diamond film on the surface of cemented carbide. The process is: (1) polishing → (2) cleaning → (3) etching WC → (4) cleaning → (5) first engraving Etching Co → (6) Cleaning → (7) Drying → (8) Coating → (9) Second etching of Co → (10) Cleaning → (11) Sol → (12) Planting; Polish the turning tool on the tool grinder (step 1), then clean the polished turning tool with an ultrasonic cleaner at room temperature (step 2) for one to three times, the cleaning solution is deionized water (distilled water is also available), each time 5min. Put the cleaned turning tool into a plastic container, pour the etching WC solution prepared by potassium ferricyanide, potassium hydroxide and water according to 1:1:10 (the same formula as the prior art can also be used) In the plastic container, the liquid level exceeds the turning tool b...