Coating hard alloy matrix and preparation method thereof

A hard alloy substrate and hard alloy technology, applied in the direction of heating inorganic powder coating, etc., to achieve the effect of prolonging the service life and improving the bonding force of the film base

Active Publication Date: 2017-06-13
河北株冀硬质合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] When the inventor continued to study to effectively improve the bonding strength between the coating and the substrate, that is, the bonding force of the film base, it was found that there is no coating based on the direct contact between the hard phase and the bonding phase lattice constant in the cemented carbide substrate and its surface. Report on the control of lattice constant matching degree between layer phases and the technical principle of control effectiveness guarantee

Method used

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  • Coating hard alloy matrix and preparation method thereof
  • Coating hard alloy matrix and preparation method thereof
  • Coating hard alloy matrix and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Choose commercial WC, Co, Mo 2 C, Ru powder as raw material, according to WC-10Co-1.2Mo 2 C-1.5Ru (the value represents the mass fraction, %, the same below) is used for batching. The wet grinding process of the mixture is as follows: the ratio of ball to material is 4:1, and the rolling wet ball milling time is 48h. After drying and granulating the wet-milled mixture, a cylinder with a diameter of 15 mm and a height of 4 mm was prepared by compression molding. The compact was sintered by pressure sintering process containing CO, and the temperature of the final heat preservation and sintering stage of the sintering process was 1430 ° C; after vacuum sintering and heat preservation at 1430 ° C for 30 min, CO and Ar were simultaneously introduced into the pressure sintering furnace for pressure sintering, among which The ratio of the filling volume of CO gas to the total volume of the pressure sintering furnace is 1:100, and the pressure in the pressure sintering furna...

Embodiment 2

[0057] Choose commercial WC, Co, Mo 2 C, Ru, Cr 3 C 2 , VC powder as raw material, according to WC–12Co–0.6Cr 3 C 2 –0.4VC–1.2Mo 2 C-1.2Ru ingredients are used for batching. The wet grinding process of the mixture is as follows: the ratio of ball to material is 6:1, and the rolling wet ball milling time is 72h. After drying and granulating the wet-milled mixture, a cylinder with a diameter of 15 mm and a height of 4 mm was prepared by compression molding. The compact was sintered by pressure sintering process containing CO, and the temperature of the final heat preservation and sintering stage of the sintering process was 1380 ° C; after vacuum sintering and heat preservation at 1380 ° C for 20 minutes, CO and Ar were simultaneously introduced into the pressure sintering furnace for pressure sintering, among which The ratio of the filling volume of CO gas to the total volume of the pressure sintering furnace is 3:100, and the pressure in the pressure sintering furnace re...

Embodiment 3

[0064] According to the use of commercial WC, Co, Mo 2 C, Ru, WC–25TiC–30TaC–20NbC powder as raw materials, according to WC–6Co–5TiC–6TaC–4NbC–0.9Mo 2 C–0.78Ru ingredients are used for batching. The wet grinding process of the mixture is as follows: the ratio of ball to material is 6:1, and the rolling wet ball milling time is 60h. After drying and granulating the wet-milled mixture, a cylinder with a diameter of 15 mm and a height of 4 mm was prepared by compression molding. The compact was sintered by pressure sintering process containing CO, and the temperature of the final heat preservation and sintering stage of the sintering process was 1450 ° C; after vacuum sintering and heat preservation at 1450 ° C for 30 min, CO and Ar were simultaneously introduced into the pressure sintering furnace for pressure sintering, among which The ratio of the filling volume of CO gas to the total volume of the pressure sintering furnace is 2:100, and the pressure in the pressure sinteri...

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Abstract

The invention provides a coating hard alloy matrix having high film-based binding force with metal nitride on the basis of design principles of an alloy material for phase lattice mismatch regulation at a film-based interface and regulation effectiveness guarantee and a preparation method of the alloy material. The hard alloy matrix is made of WC-Co-based alloy. WC-based hard phase and Co-based binding phase lattice constants are regulated respectively by adding Mo2C and Ru into the alloy at the same time to promote metal nitride film nucleation and stabilize interface phase crystal structure so as to realize effective regulation of phase lattice mismatch at the film-based interface; each of mass ratio of Mo2C and Co in the WC-Co-based alloy and mass ratio of Ru and Co is (10-15):100, grain size of the WC-based hard phase is smaller than 1.5um, and Co-based binding phase is of a close-packed hexagonal structure. The hard alloy matrix is prepared by adopting processes of wet milling, drying and granulating, pressing for forming and CO-containing pressurizing and sintering.

Description

technical field [0001] The invention relates to a coated hard alloy substrate and a preparation method thereof, belonging to the technical field of powder metallurgy composite materials. Background technique [0002] Coated cemented carbide is composed of two parts, a cemented carbide substrate and a coating. The coated cemented carbide substrate refers to a special substrate for coated cemented carbide, referred to as a cemented carbide substrate. The bonding state (ie coherent, semi-coherent and non-coherent) and its stability between the atoms at the interface between the cemented carbide substrate and the coating have a great influence on the film-based bonding force between the cemented carbide substrate and the coating and its stability. Stability has a big impact. Improving the bonding force and stability of the film base is an important means to improve the product quality and service life of coated carbide tools. Due to the lattice spacing mismatch, asynchronous n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08B22F7/04B22F3/16C22C19/07C22C32/00
CPCB22F3/16B22F7/04B22F2999/00C22C19/07C22C32/0052C23C24/08B22F2201/20B22F2201/04B22F2201/11
Inventor 张立陈述陈宜
Owner 河北株冀硬质合金有限公司
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