A method for grain refinement and size distribution homogenization of ultrafine-grained cemented carbide

A technology of grain size and hard alloy, which is applied in the field of industrial preparation of ultra-fine grain WC-Co hard alloy, can solve the problem of high surface energy and deformation storage energy of ultra-fine or nano WC-Co powder, and grain growth , poor uniformity of grain structure of cemented carbide bulk materials, etc., to achieve the effect of inhibiting the rapid growth of grains and eliminating deformation storage energy

Active Publication Date: 2017-09-22
北硬科技香河有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention is aimed at the common problems in the current industrial production: the surface energy and deformation storage energy of ultra-fine or nanometer WC-Co powder through ball milling are high, the sintering process is prone to grain growth, and the crystal grains in the hard alloy bulk material are caused. Poor grain structure uniformity, low material properties, etc., providing a method to obtain uniform grain size distribution of ultra-fine-grained cemented carbide

Method used

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  • A method for grain refinement and size distribution homogenization of ultrafine-grained cemented carbide
  • A method for grain refinement and size distribution homogenization of ultrafine-grained cemented carbide
  • A method for grain refinement and size distribution homogenization of ultrafine-grained cemented carbide

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Effect test

Embodiment 1

[0020] WC-8Co composite powder was prepared with the existing authorized patent technology (Patent No. ZL 200610165554.2), and the grain growth inhibitor Cr 3 C 2 The powder is added to the composite powder for ball milling, where Cr 3 C 2 The amount of powder added is 0.6wt.%, with absolute ethanol as the grinding medium, 0.2wt.% Tween-80 is added as the dispersant, the mass ratio of the grinding ball to the powder is 5:1, and the volume ratio of the grinding medium to the material is 1:1, the speed of the ball mill is 300r / min, and the ball milling time is 30 hours. The wet powder obtained after ball milling is passed through a 325 mesh sieve, and the suspension is separated after settling for 2 minutes, and WC, Co and Cr are obtained after drying. 3 C 2 mixed powder;

[0021] The obtained powder was annealed at 600°C in a tube furnace, and annealed with argon and 5% hydrogen as protective gas for 7 hours. The annealing process was: heating at 10°C / min, holding at 200°C...

Embodiment 2

[0024] WC-10Co composite powder was prepared with the existing authorized patent technology (Patent No. ZL 200610165554.2), and the grain growth inhibitor VC and Cr 3 C 2 The powder is added to the composite powder for ball milling, wherein the VC powder is added in an amount of 0.2wt.%, Cr 3 C 2 The amount of powder added is 0.3wt.%, with absolute ethanol as the grinding medium, 0.6wt.% Tween-80 is added as the dispersant, the mass ratio of the grinding ball to the powder is 7:1, and the volume ratio of the grinding medium to the material is 1:1, the ball mill speed is 300r / min, the ball milling time is 30 hours, the wet powder obtained after ball milling is passed through a 325 mesh sieve, and the suspension is separated after settling for 2 minutes, and WC, Co, VC and Cr are obtained after drying 3 C 2 mixed powder;

[0025] The obtained powder was annealed at 700°C in a tube furnace, and annealed with argon and 5% hydrogen as protective gas for 6 hours. The annealing p...

Embodiment 3

[0028] WC-12Co composite powder was prepared with the existing authorized patent technology (Patent No. ZL 200610165554.2), and the grain growth inhibitor Cr 3 C 2 The powder is added to the composite powder for ball milling, where Cr 3 C 2 The amount of powder added is 0.8wt.%, with absolute ethanol as the grinding medium, 0.3wt.% Tween-80 is added as the dispersant, the mass ratio of the grinding ball to the powder is 5:1, and the volume ratio of the grinding medium to the material is 1:1, the speed of the ball mill is 300r / min, the ball milling time is 30 hours, the wet powder obtained after ball milling is passed through a 325 mesh sieve, and the suspension is separated after settling for 3 minutes, and WC, Co and Cr are obtained after drying 3 C 2 mixed powder;

[0029] The obtained powder was annealed at 600°C in a tube furnace, and annealed with argon and 5% hydrogen as protective gas for 5 hours. The annealing process was: heating at 10°C / min, holding at 200°C for ...

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Abstract

The invention relates to a superfine crystal hard alloy grain refinement and size distribution uniformization method, belonging to the technical fields of hard alloys and powder metallurgy. The method comprises the following steps: by using tungsten oxide, cobalt oxide and carbon black as raw materials, carrying out in-situ reaction synthesis to prepare WC-Co composite powder; adding a small amount of Cr3C2 or Cr3C2 and VC in the WC-Co composite powder as a grain growth inhibitor; and carrying out ball milling mixing, passing through the powder through a screen, drying, carrying out long-term annealing treatment on the dried powder at lower temperature by using argon and hydrogen as protective gases, and carrying out pressure molding and low-pressure sintering to obtain the hard alloy block material. The method effectively inhibits the grain in the hard alloy of the superfine crystal or nanocrystal structure from quick growth in the sintering process, and enhances the microscopic structure uniformity of the hard alloy block material.

Description

technical field [0001] The invention relates to an industrialized preparation method of ultra-fine-grained WC-Co cemented carbide with both grain refinement and uniform grain size distribution, belonging to the technical field of cemented carbide and powder metallurgy. Background technique [0002] WC-Co cemented carbide has been widely used in cutting tools, moulds, mining tools and wear-resistant parts due to its high hardness and wear resistance. With the upgrading of materials, the processing objects of cemented carbide have gradually become difficult-to-machine high-hardness and high-strength alloys. At the same time, with the rapid development of high-end industrial fields such as aerospace and microelectronics, the performance of cemented carbide has been raised. higher requirement. Ultrafine-grained cemented carbide has obvious advantages in hardness, wear resistance, strength, etc., and plays the role of the main force in the field of cutting processing. However, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10C22C29/08
CPCC22C1/055C22C1/1026C22C29/08
Inventor 宋晓艳刘兴伟王海滨刘雪梅谢丽杰
Owner 北硬科技香河有限公司
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