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Hard alloy with surface-layer binding-phase-rich gradient structure and preparation method thereof

A cemented carbide and gradient structure technology, applied in the field of powder metallurgy, can solve the problems of low binder content in the surface layer, toughening effect, chipping, etc.

Active Publication Date: 2020-07-07
九江金鹭硬质合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the binder is only enriched on the transition surface between the gradient layer and the normal tissue, the low binder content in the surface layer will not achieve the expected toughening effect, resulting in chipping during cutting

Method used

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  • Hard alloy with surface-layer binding-phase-rich gradient structure and preparation method thereof
  • Hard alloy with surface-layer binding-phase-rich gradient structure and preparation method thereof
  • Hard alloy with surface-layer binding-phase-rich gradient structure and preparation method thereof

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Embodiment 1

[0045] A kind of cemented carbide of the present invention has surface layer rich binder phase gradient structure, described cemented carbide is made of WC, Co, Re, TaC, NbC, TiC, TiC 0.5 N 0.5 composition. The mass percentage of each substance in the cemented carbide is: WC 79.5%, Co 8%, Re 0.5%, TaC 5%, NbC 3%, TiC 2%, TiC 0.5 N 0.5 2%. The thickness of the binder-rich gradient structure is 40 μm, and the content of the binder phase at 0-20 μm away from the alloy surface is evenly distributed, about 11%, which is 137.5% of the nominal content of 8%. The binder phase at 20-32 μm away from the alloy surface The junction phase content is evenly distributed, about 15%, which is 188% of the nominal content of 8%. Lower, here the transition layer between the gradient layer and the core tissue (normal tissue). Such as figure 1 Shown is the binder phase distribution map (EPMA) in the 100 μm region of the cemented carbide surface of the embodiment of the present invention. Suc...

Embodiment 2

[0053] A kind of cemented carbide of the present invention has surface layer rich binder phase gradient structure, described cemented carbide is made of WC, Co, TaC, NbC, TiC, TiC 0.5 N 0.5 composition. The mass percentage of each substance in the cemented carbide is: WC 83%, Co 7%, TaC 4%, NbC 2%, TiC 3%, TiC 0.5 N 0.5 1%. The thickness of the binder-rich gradient structure is 25 μm, and the content of the binder phase at 0-15 μm from the alloy surface is evenly distributed, about 10%, which is 143% of the nominal content of 7%. The binder phase at 15-25 μm from the alloy surface The content of the binding phase is evenly distributed, about 12.5%, which is 178.5% of the nominal content of 7%, and the content of the binding phase decreases rapidly at a distance of 25-30 μm from the alloy surface, which is between the gradient layer and the core tissue (normal tissue) transition layer. Such as image 3 Shown is the binder phase distribution map (EPMA) in the 100 μm region...

Embodiment 3

[0060] A kind of cemented carbide of the present invention has surface rich binder phase gradient structure, described cemented carbide is made of WC, Co, Ni 3 Al, B, TaC, TiC, TiC 0.5 N 0.5 composition. The mass percentage of each substance in cemented carbide is: WC accounts for 84.95%, Co accounts for 8%, Ni 3 Al accounted for 1%, B accounted for 0.05%, TaC accounted for 2%, TiC accounted for 3.5%, TiC 0.5 N 0.5 0.5%. The thickness of the gradient structure rich in binder phase is 47 μm, and the content of binder phase at 0-20 μm away from the alloy surface gradually increases from 9.6% to 13%, which is 120-162% of the nominal content of 8%, and 20% away from the alloy surface The binder phase content at -47μm is evenly distributed, about 14.0%, which is 175% of the nominal content of 8%, and the binder phase content decreases rapidly at 47-50μm from the alloy surface, where the gradient layer and the core structure ( transition layer between normal tissues). Such as...

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Abstract

The invention discloses a hard alloy with a surface-layer binding-phase-rich gradient structure and a preparation method thereof. The hard alloy with the surface-layer binding-phase-rich gradient structure takes Ni3Al, Ru, Re and B strengthened metal as a binding phase, takes WC and cubic carbides such as TaC, NbC, TiC and TiCxNy or solid solutions thereof as a hard phase, wherein the cubic carbides account for 3-12% (in mass fraction) of the hard alloy, and TiCxNy content is 0.5-2.0%; and the binding phase accounts for 4.5-12.5% (in mass fraction) of the hard alloy, and the rest is WC. The preparation method comprises wet-grinding, drying and pelletizing, mould-pressing and forming as well as sintering. The hard alloy with the surface-layer binding-phase-rich gradient structure has excellent toughness, wear resistance and oxidization resistance, and is suitable for processing metal materials such as cast iron, alloy steel, stainless steel and high-temperature alloy.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and relates to a cemented carbide and a preparation method thereof, in particular to a cemented carbide cutting blade and a preparation method of a cemented carbide with a surface-layer-rich binder phase gradient structure. Background technique [0002] Cemented carbide has high hardness, good wear resistance, high strength and toughness, good high temperature resistance and other properties, and is widely used in the field of cutting processing. With the development of material science and mechanical processing industry, it is required that cemented carbide cutting tools can meet the requirements of use under higher processing efficiency. Coated carbide tools can not only make full use of the high wear resistance of the coating but also give full play to the better impact toughness of the cemented carbide, but the coating is prone to micro-cracks under stress. In order to prevent cracks from pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/02C22C1/05B22F3/10B22F3/14B22F5/00
CPCB22F3/1007B22F3/14B22F5/00B22F2005/001B22F2999/00C22C1/051C22C29/005C22C29/02B22F2207/03
Inventor 程登峰孙东平欧文辉刘娜娜梁闯王晴芳赵超奇
Owner 九江金鹭硬质合金有限公司
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