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Non-uniform hard alloy prepared by adopting close-packed batching mode and preparation method thereof

A cemented carbide, non-uniform technology, applied in the field of cemented carbide, can solve the problem of inability to judge the grain size and performance of the product, and has not seen the performance of non-uniform cemented carbide, etc., to achieve a wide range of grain distribution and good resistance. Abrasive, good performance effect

Inactive Publication Date: 2020-07-28
江西江钨硬质合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The hard alloy preparation methods disclosed in the prior art all use coarse tungsten carbide powder and nano tungsten carbide powder or coarse tungsten carbide powder and fine tungsten carbide powder as raw materials, and the prepared hard alloy has coarse grains and also has Nano-grains, indicating that the grain size and performance of the product cannot be simply judged from the grain size of tungsten carbide powder in the raw material
[0007] At present, there is no heterogeneous cemented carbide with excellent performance that can be applied to extreme working conditions.

Method used

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  • Non-uniform hard alloy prepared by adopting close-packed batching mode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this embodiment, a non-uniform (wide grain size distribution) cemented carbide is prepared, and the specific preparation process is as follows:

[0042] S1. Preparation of WC-10% Co: Put coarse-grained tungsten carbide, medium-grained tungsten carbide, ultra-fine or nano-particled tungsten carbide and bonding phase in a ball mill, the ball-to-material ratio is 2:1, and the ball-milling medium is absolute ethanol , the liquid-to-solid ratio is 0.3ml / g, and wet milled for 12 hours to obtain a wet milled mixture.

[0043] WC is composed of coarse grain WC, medium grain WC, superfine or nano grain WC, the mass ratio of the three is 6:3:1; the Fischer particle size of coarse grain WC is 30 μm, and the Fischer grain size of medium grain WC is 2 μm , the Fischer particle size of ultrafine or nanoparticle WC is 0.1 μm; the amount of Co added is 10% of the total WC mass.

[0044] S2. Press the wet-milled mixture under a pressure of 10 MPa, and then sinter the compacted compa...

Embodiment 2

[0046] In this embodiment, a non-uniform (wide grain size distribution) cemented carbide is prepared, and the specific preparation process is as follows:

[0047] S1. Preparation of WC-11% Co: Put coarse-grained tungsten carbide, medium-grained tungsten carbide, ultra-fine or nano-particled tungsten carbide and bonding phase in a ball mill, the ball-to-material ratio is 2:1, and the ball-milling medium is absolute ethanol , the liquid-to-solid ratio is 0.3ml / g, and wet milled for 12 hours to obtain a wet milled mixture.

[0048] WC is composed of coarse grain WC, medium grain WC, superfine or nano grain WC, the mass ratio of the three is 7:2:1; the Fischer particle size of coarse grain WC is 30 μm, and the Fischer grain size of medium grain WC is 3 μm , the Fischer particle size of ultrafine or nanoparticle WC is 0.2 μm.

[0049] S2. Press the wet-milled mixture under a pressure of 10 MPa, and then sinter the compacted compact under vacuum conditions. The sintering temperatur...

Embodiment 3

[0051] In this embodiment, a non-uniform (wide grain size distribution) cemented carbide is prepared, and the specific preparation process is as follows:

[0052] S1. Preparation of WC-12% Co: Put coarse-grained tungsten carbide, medium-grained tungsten carbide, ultra-fine or nano-particled tungsten carbide and bonding phase in a ball mill, the ball-to-material ratio is 2:1, and the ball-milling medium is absolute ethanol , the liquid-to-material ratio is 0.3ml / g, and wet milled for 15 hours to obtain a wet milled mixture.

[0053] WC is composed of coarse grain WC, medium grain WC, superfine or nano grain WC, the mass ratio of the three is 6.5:2.5:1; the Fischer particle size of coarse grain WC is 30 μm, and that of medium grain WC is 3 μm , the Fischer particle size of ultrafine or nanoparticle WC is 0.1 μm.

[0054] S2. Press the wet-milled mixture under a pressure of 10 MPa, and then sinter the compacted green compact under vacuum conditions. The sintering temperature is ...

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Abstract

The invention discloses a non-uniform hard alloy prepared by adopting a close-packed batching mode, and relates to the technical field of hard alloys. The hard alloy is prepared from the following rawmaterials: coarse-particle tungsten carbide, medium-particle tungsten carbide and nano-particle tungsten carbide powder. The invention further provides a preparation technology process method of thehard alloy. The non-uniform hard alloy has the beneficial effects that the average grain size of the prepared hard alloy is 5-10 microns, the coarse grain size reaches 10-20 microns, the Vickers hardness is 1050 or above, the bending strength TRS is 2200MPa or above, the metallographic structure of alloy grains is thick and large, the heat conductivity is extremely high, the thermal fatigue resistance and the thermal impact resistance are good, and the non-uniform hard alloy can be used for continuous exploitation of soft rock under extreme working conditions and the like.

Description

technical field [0001] The invention relates to the field of cemented carbide, in particular to a heterogeneous cemented carbide prepared by a close-packed batching method and a preparation method thereof. Background technique [0002] Cemented carbide is a multi-phase solid material prepared by powder metallurgy method based on refractory transition metal carbides such as WC and iron group metal elements such as Co as binder. Cemented carbide has excellent properties such as high hardness, wear resistance and corrosion resistance, high elastic modulus, and low thermal expansion coefficient. Therefore, cemented carbide is known as "the tooth of industry" and is widely used in cutting tools, geological and mining tools, and Grinding parts and other fields. As a brittle material, cemented carbide has an inherent contradiction between strength and hardness. Generally, the higher the hardness, the lower the strength, and the higher the strength, the lower the hardness. In the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10
CPCC22C1/051C22C29/067C22C29/08
Inventor 陈玉柏徐伟郭永忠汤昌仁梁瑜胡梦云
Owner 江西江钨硬质合金有限公司
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