High-performance hard alloy with cobalt-based alloy as binding phase

A cemented carbide, cobalt-based alloy technology, applied in the field of high-performance cemented carbide, can solve the problems of many pores, WC grain growth, high cost, and achieve the effect of solving excessive pores and small grain size

Inactive Publication Date: 2017-06-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a high-performance cemented carbide, which solves the technical problems of large-scal

Method used

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  • High-performance hard alloy with cobalt-based alloy as binding phase
  • High-performance hard alloy with cobalt-based alloy as binding phase
  • High-performance hard alloy with cobalt-based alloy as binding phase

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Embodiment 1: take cobalt-based alloy as the high-performance cemented carbide of bonding phase

[0013] Select tungsten carbide powder (purity 99.9%, 300 mesh) to add cobalt-based alloy (Co 82 -Al 8 -W 10 ) as a raw material, wherein tungsten carbide powder accounts for 90wt% of the total raw material, and cobalt-based alloy accounts for 10wt% of the total raw material. After ball milling for 36 hours, the above prepared mixture was pressed into a compact, wherein the pressing pressure was 100 MPa. Vacuum sintering is carried out on the compacted compact, and the sintering process is as follows: first, heat to 1350° C., hold for 2 hours, then cool down to 1,200° C. and hold for 2 hours. The prepared cemented carbide WC has a particle size of 200mm, a hardness of 2100HV0.5, and a service life of 2.1 times that of the standard cemented carbide with the same composition.

Embodiment 2

[0014] Embodiment 2: take cobalt-based alloy as the high-performance cemented carbide of bonding phase

[0015] Select tungsten carbide powder (purity 99.9%, 300 mesh) to add cobalt-based alloy (Co 99 -Al 1 -W 0.1 ) as a raw material, wherein tungsten carbide powder accounts for 90wt% of the total raw material, and cobalt-based alloy accounts for 10wt% of the total raw material. After ball milling for 36 hours, the above prepared mixture was pressed into a compact, wherein the pressing pressure was 100 MPa. Vacuum sintering is carried out on the compacted compact, and the sintering process is as follows: first, heat to 1350° C., hold for 2 hours, then cool down to 1,200° C. and hold for 2 hours. The prepared cemented carbide WC has a particle size of 260nm, a hardness of 2000HV0.5, and a service life of 1.4 times that of the standard cemented carbide with the same composition.

Embodiment 3

[0016] Embodiment 3: take cobalt-based alloy as the high-performance cemented carbide of bonding phase

[0017] Select tungsten carbide powder (purity 99.9%, 300 mesh) to add cobalt-based alloy (Co 78 -Al 10 -W 12 ) as a raw material, wherein tungsten carbide powder accounts for 90wt% of the total raw material, and cobalt-based alloy accounts for 10wt% of the total raw material. After ball milling for 36 hours, the above prepared mixture was pressed into a compact, wherein the pressing pressure was 100 MPa. Vacuum sintering is carried out on the compacted compact, and the sintering process is as follows: first, heat to 1350° C., hold for 2 hours, then cool down to 1,200° C. and hold for 2 hours. The prepared cemented carbide WC has a particle size of 240nm, a hardness of 2030HV0.5, and a service life of 1.5 times that of the standard cemented carbide with the same composition.

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Abstract

The invention discloses a high-performance hard alloy and a preparation method thereof. The high-performance hard alloy is prepared with a cobalt-based alloy as a binding phase, and the cobalt-based alloy is composed of, by mole percentage, 78%-99% of Co, 1%-10% of Al and 0.1%-12% of W. According to the hard alloy prepared through the method, the size D of each WC particle is less than 300 nm; the hardness reaches 2100 HV at a maximum; the sintering temperature is lowered by 50 DEG C; and the service life reaches 2.1 times that of a standard hard alloy composed of the same constituents at a maximum.

Description

technical field [0001] The invention relates to a high-performance cemented carbide, which belongs to the technical field of cemented carbide preparation. [0002] Background technique: [0003] Cemented carbide refers to one or more carbides of refractory metals (WC, TiC, etc.) as the hard phase, and metal binders (Co, Fe, Ni, etc.) manufactured materials. Since the 1930s, cemented carbide has been widely used in ore tools, cutting tools, medical materials, wear-resistant parts, micro-drills and other equipment. With the rapid development of the manufacturing industry, cemented carbide cutting tool materials are required to have high toughness at the same time of high strength, which is the so-called "double high alloy". [0004] Studies have shown that when the particle size of tungsten carbide (WC) is reduced below submicrons, the hardness and wear resistance, strength and toughness of cemented carbide materials are improved, so the development of ultrafine or even nanoc...

Claims

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Application Information

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IPC IPC(8): C22C19/07C22C29/08C22C1/05
Inventor 孔见陈宇
Owner NANJING UNIV OF SCI & TECH
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