A kind of removal of cemented carbide surface al 2 o 3 and ticn composite coating method

A cemented carbide and composite coating technology, applied in chemical instruments and methods, transportation and packaging, solid waste removal, etc., can solve the problems of difficult removal of coating, easy introduction of impurities, unfavorable environment, etc., to achieve coating The effect of complete removal, uniform coating removal and uniform crack distribution

Active Publication Date: 2017-12-29
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Researchers have studied the removal methods of cemented carbide surface coatings, such as chemical decomposition methods, electrolytic methods, electrochemical methods, etc. in chemical methods. These methods use a large amount of acid-base solution, which is very unfavorable to the environment; physical methods Such as ion beam, sand blasting, etc., there are problems such as high cost, easy introduction of impurities, and difficulty in removing the coating.

Method used

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  • A kind of removal of cemented carbide surface al <sub>2</sub> o <sub>3</sub> and ticn composite coating method
  • A kind of removal of cemented carbide surface al <sub>2</sub> o <sub>3</sub> and ticn composite coating method
  • A kind of removal of cemented carbide surface al <sub>2</sub> o <sub>3</sub> and ticn composite coating method

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Embodiment 1

[0024] Embodiment 1: the sectional view of raw material is as figure 1 shown. The substrate is WC-10Co cemented carbide, and the coating composition in direct contact with the substrate is TiCN, with a thickness of 9 μm, Al 2 o 3 The thickness of the coating is 4μm, which is the surface layer of the sample, which is in direct contact with the outside world. The volume of the raw material sample is 730mm 3 ; Place the raw material in a muffle furnace, raise the heating rate to 950°C at a heating rate of 5°C / min, and keep it warm for 240 minutes; place the heated sample in liquid nitrogen and quench for 30s; place the quenched sample in a ball mill Wet milling is carried out in a medium, and its parameters are: the ball milling medium is water, the ball-to-material ratio is 0.5:1, the grinding ball is a hard alloy ball with a diameter of φ3mm, the ball milling speed is 120 rpm, and the ball milling time is 30 minutes; after ball milling, filter Remove impurities, dry and remo...

Embodiment 2

[0025] Embodiment 2: the matrix of raw material is the WC-16Co cemented carbide that contains inhibitor, and TiCN coating thickness is 12 μ m, Al 2 o 3 Coating thickness is 6μm, alloy volume is 20mm 3 . Put the raw material in a muffle furnace, raise the heating rate to 800°C at a heating rate of 8°C / min, and keep it warm for 50 minutes; place the heated sample in liquid nitrogen and quench it for 50s, and the surface morphology and composition of the sample after quenching Such as Figure 4 As shown; after quenching, the sample is placed in a ball mill for wet grinding. The parameters are: the ball milling medium is water, the ball-to-material ratio is 0.5:1, the grinding ball is a carbide ball with a diameter of φ5mm, and the ball milling speed is 100 rpm , the ball milling time is 45 minutes; after ball milling, filter out impurities, dry and remove balls; place the obtained sample in a muffle furnace at 1000°C for 40 minutes and then carry out wet milling, the ball mill...

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Abstract

A method for removing Al from the surface of cemented carbide 2 o 3 The method for compound coating with TiCN belongs to the technical field of cemented carbide materials and powder metallurgy. Taking the difference in thermal expansion coefficient between the coating material and the base material as an entry point, considering the size of the material and the thickness of the coating, and considering the difference in thermal conductivity and expansion coefficient between the base material and the coating material, formulate a formula with Al 2 o 3 The heating process of hard alloy with TiCN composite coating and the quenching process in liquid nitrogen; for the sample after ball milling, the heat treatment temperature and holding time are determined according to the Co content of the matrix, and the cemented carbide with the composite coating removed is obtained after further ball milling bulk material. The invention uses simple equipment, does not introduce impurities, is energy-saving and environmentally friendly, and can realize industrial scale production, and can completely remove Al 2 o 3 And TiCN composite coating to obtain pure cemented carbide matrix material.

Description

technical field [0001] The invention relates to a method for removing Al from the surface of cemented carbide 2 o 3 The method for compound coating with TiCN belongs to the technical field of cemented carbide materials and powder metallurgy. Background technique [0002] Cutting tools are one of the important directions for the application of cemented carbide materials. Al 2 o 3 The composite coating with TiCN has a small coating thickness (usually only a dozen to tens of microns), and is firmly combined with the cemented carbide substrate, which can greatly improve the wear resistance and oxidation corrosion resistance of the tool. Therefore, cemented carbide cutting tools with composite coatings have become mainstream products for cutting tool applications. With the increase in the application range and quantity of knives, a large number of knives are scrapped every year. These scrapped knives contain a large amount of strategic element tungsten and rare metal cobalt,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00B02C17/00
CPCB02C17/00B09B3/00B09B5/00B09B3/40
Inventor 刘雪梅王海滨宋晓艳杨涛
Owner BEIJING UNIV OF TECH
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