Ultra-fine gradient hard alloy with WC grains in surface rich binding-phase layer arrayed in regular shape and preparation method of ultra-fine gradient hard alloy

A cemented carbide and binder phase technology, which is applied in the field of ultra-fine grain gradient cemented carbide and its preparation, can solve the problems of difficult control, poor rigidity and resistance to plastic deformation, and low hardness, so as to improve performance and surface Toughness, enhanced impact resistance

Inactive Publication Date: 2019-12-13
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that the grain size of the gradient structure cemented carbide has large grain size, low strength and hardness, and high toughne

Method used

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  • Ultra-fine gradient hard alloy with WC grains in surface rich binding-phase layer arrayed in regular shape and preparation method of ultra-fine gradient hard alloy
  • Ultra-fine gradient hard alloy with WC grains in surface rich binding-phase layer arrayed in regular shape and preparation method of ultra-fine gradient hard alloy
  • Ultra-fine gradient hard alloy with WC grains in surface rich binding-phase layer arrayed in regular shape and preparation method of ultra-fine gradient hard alloy

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Embodiment 1

[0035] The present invention is an ultra-fine-grain gradient cemented carbide with regularly arranged WC crystal grains in the surface rich binder phase layer, and its composition is 80%WC, 3%Ti(C,N), 7% by mass percentage. (W,Ti)C, 10%Co, its metallographic structure is based on WC and cubic carbonitride as the core hard phase, and cobalt as the binder phase to form a 60μm thick binder phase layer on the outside. WC The average size of the crystal grains is 0.6μm, the surface rich binder phase gradient layer does not contain cubic carbonitrides, the cobalt content is 1-2 times the nominal cobalt content of the cemented carbide, and the surface rich binder phase gradient layer contains Most of the WC crystal grains are rectangular plates and arranged regularly, and the WC crystal grains in the core are randomly distributed.

[0036] The method for preparing an ultra-fine-grain gradient cemented carbide with regularly arranged WC crystal grains in the surface of the binder-rich la...

Embodiment 2

[0042] The present invention is an ultra-fine-grain gradient cemented carbide with regular arrangement of WC crystal grains in the surface rich binder phase layer, and its composition is 78%WC, 5%Ti(C,N), 8% by mass percentage. (W,Ti)C, 9%Co, its metallographic structure is based on WC and cubic carbonitride as the core hard phase, and cobalt as the binder phase to form a 50μm thick binder phase layer on the outside, WC The average grain size is 0.5μm, the outer binder-rich gradient layer does not contain cubic carbonitrides, the cobalt content is 1-2 times the nominal cobalt content of the cemented carbide, and the surface is rich in WC in the binder phase layer The shape is a rectangular plate and is arranged regularly, and the core WC crystal grains vary in size and are randomly distributed.

[0043] The method for preparing an ultra-fine-grain gradient cemented carbide with regularly arranged WC crystal grains in the surface of the binder-rich layer of the present invention i...

Embodiment 3

[0049] The present invention is an ultra-fine-grained graded cemented carbide with regularly arranged WC crystal grains in the binder-rich layer on the surface, and its composition is 82%WC, 4%Ti(C,N), 6% by mass percentage. (W,Ti)C, 8%Co. Its metallographic structure is based on WC and cubic carbonitride as the core hard phase, and cobalt as the binder phase to form a 70μm thick binder phase layer on the outside. WC The average grain size is 0.55μm, the outer binder-rich gradient layer does not contain cubic carbonitrides, the cobalt content is 1-2 times the nominal cobalt content of the cemented carbide, and the surface is rich in WC in the binder phase layer The shape is a rectangular plate and is arranged regularly, and the core WC crystal grains vary in size and are randomly distributed.

[0050] The method for preparing an ultra-fine-grain gradient cemented carbide with regularly arranged WC crystal grains in the surface of the binder-rich layer of the present invention is ...

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Abstract

The invention provides an ultra-fine gradient hard alloy with WC grains in a surface rich binding-phase layer arrayed in a regular shape and a preparation method of the ultra-fine gradient hard alloy,belongs to the field of hard alloy manufacturing, and particularly relates to an ultra-fine gradient hard alloy with WC grains in a surface rich binding-phase area arrayed regularly and distributed in an oriented mode and a preparation method of the ultra-fine gradient hard alloy. The surface of the gradient hard alloy is the rich binding-phase layer only containing WC and Co and having the thickness of 40-80 [mu]m, and the WC grains in a rich binding phase are approximately in a rectangular shape and are regularly arrayed and distributed in order; and WC, Co and a cubic phase are uniformly distributed in a core part, and the WC grains are distributed in an irregular and disordered shape. The preparation method comprises the steps that ingredients are ball-milled and then pressed into a hard alloy block, and the hard alloy block is sintered under pressure first and then sintered in a gradient manner under a vacuum nitrogen-free atmosphere to be subjected to heat treatment, so that theultra-fine gradient hard alloy with the WC grains in the surface rich binding-phase area distributed in the oriented mode is obtained. The ultra-fine gradient hard alloy is reasonable in structural design, the preparation process is controllable, the production cost is low, and the ultra-fine gradient hard alloy can be industrially produced and used to a large scale.

Description

Technical field [0001] The invention belongs to the field of cemented carbide manufacturing, and in particular relates to an ultra-fine-grain gradient cemented carbide with regularly arranged WC crystal grain shapes in a binder-rich phase layer on the surface and a preparation method thereof. Background technique [0002] Cemented carbide is a kind of refractory metal compound (WC, TiC, TaC, NbC, etc.) as the hard phase, transition group metals (Fe, Co, Ni) as the binder phase, prepared by powder sintering method Alloy materials have the advantages of higher strength, hardness, and better wear resistance. They are mainly used to make tools or molds, and are widely used in cutting and mold manufacturing. In recent years, with the development of material science and machining industry, the wear resistance, strength, hardness and resistance to plastic deformation of cemented carbide materials under high-speed and high-temperature continuous working conditions have become increasingl...

Claims

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Application Information

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IPC IPC(8): C22C29/02C22C1/05C22C1/10
CPCC22C1/051C22C29/005C22C29/02
Inventor 周向葵王艳吴深王凯王强李莹樊江磊
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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