Diamond coating on low-cobalt hard alloy surface and preparation method thereof

A diamond coating and cemented carbide technology, which is applied in metal material coating process, coating, gaseous chemical plating, etc., can solve the problems of low bonding strength between diamond coating and substrate, and achieve the ease of thermal diffusion and toughness. Good, reduce the effect of chemical pretreatment time

Active Publication Date: 2021-11-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the high cobalt content inside the substrate has a strong thermal diffusion effect during the deposition of the diamond coating, resulting in the technical problem of low bonding strength between the diamond coating and the substrate
Toughened and deposited diamond coating for cemented carbide substrate with low cobalt content in the present invention

Method used

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  • Diamond coating on low-cobalt hard alloy surface and preparation method thereof
  • Diamond coating on low-cobalt hard alloy surface and preparation method thereof
  • Diamond coating on low-cobalt hard alloy surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Graphene enhanced low cobalt content (3wt.% Co) cemented carbide (0.3wt.% Graphene) depositing a diamond coating matrix.

[0031] (1) graphene dispersion: a precision electronic balance graphene powder 0.3g, poured into 100mL of absolute ethanol, using cell crushing device, set to 40KHz ultrasonic frequency; ultrasonic working time duty cycle is 1: 1 ; time of the ultrasonic oscillation for 4h.

[0032] (2) ball mill mixing: a precision electronic balance cobalt powder and tungsten carbide powder 96.709g 2.991g, together with graphene (1) - The alcohol solution was poured into a ball mill jar. Weigh 700g of 5mm diameter cemented carbide (WC-wt.3% Co) balls into a ball mill jar. 100mL of absolute ethanol was added in the ball mill jar, a ball mill is provided for the rotation speed of 400 rpm, milling time 8h.

[0033] (3) dried in vacuo: The milled slurry was placed in a vacuum oven dried. The pressure in the drying oven set to 15000 Pa, a heating temperature of 90 ℃, when ...

Embodiment 2

[0038] Graphene enhanced low cobalt content (3wt.% Co) cemented carbide (0.5wt.% Graphene) depositing a diamond coating matrix.

[0039](1) graphene dispersion: 0.5 g of graphene powder with precision electron balance, poured into 100 mL of anhydrous ethanol, using a cell pulverizer, set the ultrasonic frequency of 40 kHz; the duty cycle of ultrasound working hours is: 1: 1: 1: 1: 1; the time of ultrasonic oscillation is 4h.

[0040] (2) Ball mill mixing: 2.985 g of cobalt powder and 96.515 g of tungsten carbide powder were poured into the ball grinding with graphene - alcohol solution in (1) with a precision electronic balance. Cemented carbide (WC-WT.3% Co) ball with a diameter of 5 mm is weighed, and the ball mill is placed. 100 ml of anhydrous ethanol was added to the ball mill, and the rotational speed of the ball mill was 400 rpm and the ball milling time was 8 h.

[0041] (3) Vacuum drying: Put the slurry after the ball is placed in a vacuum drying tank and dried. Set the p...

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Abstract

The invention relates to a diamond coating on the surface of a low-cobalt hard alloy and a preparation method thereof. The hard alloy with a low cobalt content is used as a base material to deposit a diamond film. Using the excellent physical properties of graphene to improve the toughness of low-cobalt cemented carbide, it is used as a base material for diamond coating. Reduce the chemical pretreatment time before diamond coating, avoid the corrosion damage to the base material caused by the long-term chemical reaction, and better maintain the dimensional accuracy of the product. At the same time, the thermal diffusion effect of cobalt in the diamond coating deposition process is alleviated, and the adhesion strength between the coating and the substrate is improved. The dual effects of improving the toughness of the diamond-coated cemented carbide substrate and eliminating the adverse effects of cobalt elements are realized, which provides an effective method for improving the performance of diamond-coated cemented carbide products.

Description

Technical field [0001] The present invention pertains to a diamond coating and its preparation, and more particularly relates to a low-cobalt cemented carbide surface of the diamond coating and preparation method thereof. Background technique [0002] High hardness, high wear resistance, high thermal conductivity, low coefficient of friction, and good chemical inertness and many excellent properties of diamond coating, such that it is widely used in the field of tooling. Depositing a diamond coating on a cemented carbide working surface of the mold, not only can greatly improve the life of tooling, but also to improve the surface quality of the workpiece. [0003] Material balance in order to balance the hardness and toughness of the matrix, diamond-coated carbide substrate selected cobalt content typically 6wt.% ~ 8wt.%. However, to eliminate catalytic graphitization cobalt matrix material in the deposition of diamond coatings, diamond coatings prior to the preparation, it must ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10C23C16/27
CPCC22C1/051C22C29/005C22C29/067C22C29/08C22C2204/00C23C16/271
Inventor 张建国原一高阮钧张金江
Owner DONGHUA UNIV
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