Ultra-fine grain hard alloy and preparing method thereof

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

Active Publication Date: 2020-07-07
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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  • Ultra-fine grain hard alloy and preparing method thereof
  • Ultra-fine grain hard alloy and preparing method thereof
  • Ultra-fine grain hard alloy and preparing 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 ultra-fine grain hard alloy which comprises WC, a binding phase and a grain growth inhibitor. The weight percentage content of the WC is 83%-96%, the average grain size is(0.2-0.6) micron, the WC grain size deviation coefficient K is larger than or equal to 0.54 and smaller than or equal to 0.61, the grain number percentage of the WC with the grain size larger than 3 times and smaller than 5 times is smaller than or equal to 5%, and the grain number percentage of the WC with the grain size larger than 5 times is smaller than or equal to 1.1%; and the binding phaseis Co, the content of Co in percentage by weight is 3%-15%, and the grain growth inhibitor comprises Cr3C2, VC, TiC and/or Ti (C, N). The invention further relates to a preparation method of the superfine hard alloy. An end mill or a drill bit manufactured by adopting the ultrafine grain hard alloy has excellent use performance in high-speed or high-efficiency cutting machining of difficult-to-machine materials such as stainless steel, a titanium alloy, PCBs, acrylic, glass fibers, hardwood, resin and CFRP.

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 Applications(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
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