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A method for eliminating residual stress of diamond composite sheet

A technology of diamond composite sheet and residual stress, which is applied in the direction of process efficiency improvement, furnace, heat treatment equipment, etc., can solve the problems of not being suitable for cutting and grinding into other shapes, and can not be used for cutting tools, so as to eliminate residual stress and improve the quality of finished products. rate, prolonging the service life

Inactive Publication Date: 2018-11-02
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two types of diamond composite sheets. One is a high-grade diamond composite sheet in which the diamond particles in the diamond layer have been grown and interlinked during the synthesis process. It can withstand cutting and grinding of the composite sheet into any shape, and is suitable for high-speed cutting tool manufacturing. and other higher requirements; the other is that the diamond particles in the diamond layer exist independently, with little or no cross-linking between particles. for cutting tools

Method used

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  • A method for eliminating residual stress of diamond composite sheet
  • A method for eliminating residual stress of diamond composite sheet
  • A method for eliminating residual stress of diamond composite sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The diamond composite sheet described in Example 1 is the product of Zhongnan Diamond Co., Ltd., the brand is ZB1208×1.5 (for mines); the diamond composite sheet described in Example 2 is the product of Zhongnan Diamond Co., Ltd., the brand is ZT10A-Φ45× 1.6×0.5 (for cemented carbide tools); the diamond composite sheet described in Example 3 is a product of Zhongnan Diamond Co., Ltd., and the brand name is ZT10H2-Φ45×1.6×0.5 (for woodworking tools).

[0020] The vacuum heating furnace described in the following examples, such as image 3 As shown, it includes a furnace body 1, a vacuum pumping system and an air charging system; the vacuum pumping system includes a diffusion pump 2, a Roots pump 3, a slide valve vacuum pump 4 and a main exhaust pipe 18 communicated with the furnace body. The air extraction pipeline 18 is divided into two branches, i.e. the first air extraction pipeline 19 and the second air extraction pipeline 20, the first air extraction pipeline 19 is ...

Embodiment 2

[0032] A method for eliminating residual stress of a diamond composite sheet, comprising the following steps: placing the diamond composite sheet in a vacuum heating furnace, and evacuating until the pressure in the furnace is 5×10 -3 Pa, start the gradient temperature rise, and keep the pressure in the furnace at 5×10 for the first 20 minutes of the gradient temperature rise. -3 Pa, then fill in the mixed gas, and finally make the temperature in the furnace 560°C and the pressure in the furnace 3 MPa, and keep it for 180 minutes, stop heating, wait for the temperature in the furnace to drop to 50°C, discharge the gas in the furnace after 10 minutes, and turn on Furnace door, take out the diamond composite sheet.

[0033] Wherein, the mixed gas is composed of the following components in volume percentage: 0.1% hydrogen, 1.0% methane, 0.1% carbon dioxide, and the balance is nitrogen.

[0034] The process of the gradient heating is shown in Table 2:

[0035] Table 2 The spec...

Embodiment 3

[0038] A method for eliminating residual stress of a diamond composite sheet, comprising the following steps: placing the diamond composite sheet in a vacuum heating furnace, and evacuating until the pressure in the furnace is 5×10 -3 Pa, start the gradient temperature rise, and keep the pressure in the furnace at 5×10 for the first 40 minutes of gradient temperature rise -3 Pa, then fill in the mixed gas, and finally make the temperature in the furnace 800°C and the pressure in the furnace 1 MPa, and keep it for 60 minutes, stop heating, wait for the temperature in the furnace to drop to 50°C, discharge the gas in the furnace after 10 minutes, and turn on Furnace door, take out the diamond composite sheet.

[0039] Wherein, the mixed gas is composed of the following components in volume percentage: 3.0% hydrogen, 8.0% methane, 1.5% carbon dioxide, and the balance is nitrogen.

[0040] The process of the gradient heating is shown in Table 3:

[0041] Table 3 The specific p...

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Abstract

The invention discloses a method of eliminating residual stress of a diamond compound sheet. The method comprises the following steps of: placing the diamond compound sheet in a vacuum heating furnace; vacuumizing till the pressure in the furnace is smaller than 5*10<-2>Pa; starting gradient temperature rise and leading in mixed gas, wherein the finally in-furnace temperature is 560-800 DEG C, and the in-furnace pressure is 1-3MPa; keeping the pressure and temperature for 60-180min; discharging gas in the furnace till the in-furnace temperature is lowered below 80 DEG C; and taking out the diamond compound sheet, wherein the mixed gas is nitrogen mixed with less hydrogen, methane and carbon dioxide. According to the method disclosed by the invention, a certain pressure is kept in the furnace to inhibit graphitization tendency of the diamond at a high temperature. By adjusting the metal component stress by temperature, cracks of the diamond are filled by means of a micro-carbon atom sedimentation phenomenon generated by decomposing methane. The residual stress in the diamond compound sheet is effectively reduced or eliminated, so that the rate of finished product of a diamond compound sheet tool is increased, and the service life of the tool is prolonged.

Description

technical field [0001] The invention belongs to the technical field of superhard materials, and in particular relates to a method for eliminating residual stress of a diamond composite sheet. Background technique [0002] Mechanical tool superhard material composite sheets include artificial diamond composite sheets and cubic boron nitride composite sheets, which have high hardness and wear resistance, high cutting precision, and are suitable for cutting non-metals such as wood and ceramics, as well as high-hardness alloys. , Cutting and processing of non-ferrous metals and other metals. Superhard material composite sheets can also be processed into rectangular, triangular, fan-shaped and other shapes according to user needs. [0003] The diamond composite sheet is made by attaching diamond to the cemented carbide substrate through high temperature and high pressure compounding. Due to the great difference in physical properties such as elastic modulus and thermal expansion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/30C21D1/74C21D9/22
CPCC21D1/30C21D1/74C21D9/22Y02P10/20
Inventor 卢灿华张洪伟张凤岭杨怀建
Owner ZHONGNAN DIAMOND CO LTD
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