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Ultrafine-grained cemented carbide and preparation method thereof

A hard alloy, ultra-fine grain technology, applied in the field of hard alloy manufacturing, can solve the problems of reducing the strength and toughness of the alloy, weakening the performance of the alloy, etc.

Active Publication Date: 2021-12-03
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is generally believed that the finer the grain size, the more GGI needs to be added (Seegopaul, Mccandlish et al.1997), but the addition of GGI will significantly reduce the strength and toughness of the alloy while inhibiting the grain growth (Toufar ,Schubert et al.2010), especially when the amount of GGI added is too large or the dispersion is uneven, a brittle third phase will be precipitated, which will seriously weaken the properties of the alloy

Method used

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  • Ultrafine-grained cemented carbide and preparation method thereof
  • Ultrafine-grained cemented carbide and preparation method thereof
  • Ultrafine-grained cemented carbide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The weight percentage of prepared Co is 3.4%, and the average grain size The ultra-fine grain WC-Co cemented carbide is used in the manufacture of glass fiber, hardwood, CFRP, glass fiber and other cutting tools.

[0056] Step 1: Choose FSSS granularity 0.78μm (approximately the average grain size of the target alloy 2 times of ), WC powder with total carbon of 6.17%, fine-grained Co powder and fine-grained GGI powder (Cr 3 C 2 , VC, TiC) (the FSSS particle size is 1.76 μm, 1.85 μm, 1.33 μm, 1.42 μm) as raw materials;

[0057] Step 2: Put the WC and GGI powder raw materials into the ball mill according to the ratio in Table 1-1 for wet grinding and mixing, and at the same time add 5% paraffin wax according to the weight of the material, and use cemented carbide balls with a diameter of 10mm as the grinding body. The ball-to-material ratio is 10:1, the ball milling speed is about 75% of the critical speed, and after 70 hours of ball milling, it is unloaded and dried...

Embodiment 2

[0083] The weight percentage of prepared Co is 6.3%, and the average grain size The ultra-fine grained WC-Co cemented carbide is used to manufacture micro drills or micro milling cutters for PCB processing.

[0084] Step 1: Choose FSSS granularity About 0.56μm (about the average grain size of the target alloy 1.6 times of ), WC powder with total carbon of 6.14%, fine-grained nearly spherical Co powder and fine-grained GGI powder (Cr 3 C 2 , VC, TiC or Ti(C,N)) (the FSSS particle size is 1.76 μm, 1.77 μm, 1.53 μm, 1.18 μm, 0.86 μm) as raw materials;

[0085] Step 2: Put the WC and GGI powder raw materials into the ball mill according to the ratio in Table 2-1 for wet grinding and mixing. At the same time, add 4% paraffin wax according to the weight of the material, and use cemented carbide balls with a diameter of 6mm as the grinding body. The ball-to-material ratio is 8:1, the ball milling speed is 70% of the critical speed, after 64 hours of ball milling, it is unloade...

Embodiment 3

[0116] The prepared Co weight percentage is 14.6%, and the average grain size The ultra-fine grained WC-Co cemented carbide is used for end mills for efficient cutting of difficult-to-machine materials such as stainless steel and titanium alloys.

[0117] Step 1: Choose FSSS granularity About 0.58μm (about the average grain size of the target alloy 1.2 times of ), WC powder with total carbon of 6.11%, fine-grained nearly spherical Co powder and fine-grained GGI powder (Cr 3 C 2 , VC, TiC) (the FSSS particle size is 1.98 μm, 1.85 μm, 1.33 μm, 1.35 μm) as raw materials;

[0118] Step 2: Put the WC and GGI powder raw materials into the ball mill according to the ratio in Table 3-1 for wet grinding and mixing, and at the same time add 3% paraffin wax according to the weight of the material, and use cemented carbide balls with a diameter of 6mm as the grinding body. The ball-to-material ratio is 6:1, the speed of ball milling is 70% of the critical speed, and after 48 hours ...

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Abstract

The invention relates to an ultrafine-grained hard alloy, which comprises WC, a bonding phase, and a grain growth inhibitor; the WC content is 83% to 96% by weight; the average grain size is (0.2 to 0.6 )μm, 0.54≤WC grain size dispersion coefficient K≤0.61, the percentage of WC grains whose grain size is greater than 3 times and less than 5 times is ≤5%, and the percentage of WC grains whose grain size is greater than 5 times is ≤1.1% ; The binder phase is Co, and the Co weight percentage content is 3% to 15%; The grain growth inhibitor includes Cr 3 C 2 , VC, TiC and or Ti(C, N), the present invention also relates to the preparation method of the above-mentioned ultrafine cemented carbide. End mills or drills made of the ultra-fine-grained carbide have excellent performance in high-speed or high-efficiency cutting of difficult-to-machine materials such as stainless steel, titanium alloy, PCB board, acrylic, glass fiber, hardwood, resin, and CFRP. Use performance.

Description

technical field [0001] The invention belongs to the technical field of cemented carbide manufacturing. The invention relates to an ultra-fine-grained cemented carbide and a preparation method thereof, in particular to a WC with specific composition and structural characteristics whose average grain size is in the range of 0.2 μm to 0.6 μm. A WC-Co cemented carbide with excellent comprehensive properties and a preparation method thereof. Background technique [0002] WC-Co cemented carbide uses WC as the hard phase, Co as the binder phase, and a small amount of Cr 3 C 2 , VC, TaC, NbC and other carbides as functional components of metal composite materials, which have excellent wear resistance, heat resistance, corrosion resistance and good strength and toughness, are widely used in various fields of the national economy and are modern industrial materials. Indispensable tooling and component materials. The current industrial production of cemented carbide generally adopts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C1/05C22C29/08
CPCC22C1/051C22C29/005C22C29/067C22C29/08
Inventor 王晓灵彭晖雍薇刘益兴熊超伟陈勇
Owner ZIGONG CEMENTED CARBIDE CORP