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Preparation method for high-performance ultrafine hard alloy

A cemented carbide, high-performance technology, applied in the field of ultra-fine cemented carbide preparation, can solve the problems that are not suitable for high-performance ultra-fine cemented carbide, the process needs to be improved, and the production cost is high, so as to achieve excellent internal structure and shorten the reaction time , the effect of grain size reduction

Active Publication Date: 2015-12-16
杭州华钻新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, sintering technology has a great influence in the process of preparing ultrafine cemented carbide. Compared with traditional sintering technologies, more advanced ones include low-pressure hot isostatic pressing sintering, spark plasma sintering, selective laser sintering, etc., but these methods The production cost is generally high, the process needs to be perfected, and the application is limited, so it is not suitable for the preparation of high-performance ultra-fine cemented carbide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 35% of ammonium vanadate, 35% of nano-chromium trioxide, and 30% of nano-carbon black according to the weight ratio, and place them in a microwave sintering furnace after uniform mixing. Sintering is carried out under the condition of 2h to obtain nanometer vanadium carbide / chromium composite powder. Take 92% nano-scale WC powder and 8% Co powder according to the weight ratio, add 0.5-2% nano-vanadium carbide / chromium composite powder, after ball milling and drying process, use molding method to press, and then put into multi-functional Microwave sintering is carried out in a microwave sintering furnace to produce high-performance YG ultrafine cemented carbide. The results show that the ultra-fine cemented carbide has an excellent internal structure, the density is increased by 3-10%, the hardness (HRA) is increased by 3-17%, and the bending strength is increased by 33-80%.

Embodiment 2

[0022] Weigh 35% of ammonium vanadate, 35% of nano-chromium trioxide, and 30% of nano-carbon black according to the weight ratio, and place them in a microwave sintering furnace after uniform mixing. Sintering is carried out under the condition of 2h to obtain nanometer vanadium carbide / chromium composite powder. Take 77% nano-scale WC powder, 8% Co powder and 15% TiC powder according to the weight ratio, and then add 0.5-2% nano-vanadium carbide / chromium composite powder, after ball milling and drying process, use molding method and It is pressed by means of isostatic pressing, and then placed in a multifunctional microwave sintering furnace for microwave sintering to obtain high-performance YT ultrafine cemented carbide. The results show that the ultra-fine cemented carbide has an excellent internal structure, the density is increased by 3-10%, the hardness (HRA) is increased by 3-17%, and the bending strength is increased by 33-80%.

Embodiment 3

[0024] Weigh 23% ammonium vanadate, 23% nano-chromium trioxide, and 54% glucose by weight, mix well, add deionized water, dry at 200°C for 1.5-2h, and place in a microwave sintering furnace after ball milling. Under gas protection, sintering is carried out at 600-1000° C. for 0.5-2 hours to obtain nanometer vanadium carbide / chromium composite powder. Take 92% nano-scale WC powder and 8% Co powder according to the weight ratio, add 0.5-2% nano-vanadium carbide / chromium composite powder, after ball milling and drying process, use molding method to press, and then put into multi-functional Microwave sintering is carried out in a microwave sintering furnace to produce high-performance YG ultrafine cemented carbide. The results show that the ultra-fine cemented carbide has an excellent internal structure, the density is increased by 3-10%, the hardness (HRA) is increased by 3-17%, and the bending strength is increased by 33-80%.

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Abstract

The invention belongs to the field of ultrafine hard alloy preparation, and relates to a preparation method for high-performance ultrafine hard alloy. The preparation method comprises the following steps that a, nanometer chromic oxide, ammonia vanadate and a carbonaceous reducing agent are weighed proportionally and evenly mixed to be placed into a microwave sintering furnace to be sintered to obtain a nanometer vanadium carbide / chromium composite grain inhibitor; b, nanoscale WC powder and Co powder are weighed proportionally, or nanoscale WC powder, Co powder and TiC powder are weighed proportionally, 0.5-2% of the composite grain inhibitor obtained in the step a is added, and microwave sintering is performed on the mixture after technologies such as mixing, ball milling, drying and pressing are performed to obtain the ultrafine hard alloy. Compared with hard alloy prepared through an existing method, the density of the hard alloy is improved by 3-10%, the hardness (HRA) is improved by 3-17%, and the bending strength is improved by 33-80%. Internal defects of the hard alloy are greatly reduced, almost no gaps exist, hard phases and binding phases are dispersed evenly, and the average WC grain size is close to the nanoscale. The preparation method has the beneficial effects that the reaction temperature is low, the reaction time is short, and energy is saved, provides references for preparation and production of high-performance ultrafine hard alloy, and has the wide industrial application prospect.

Description

technical field [0001] The invention belongs to the field of ultrafine hard alloy preparation, and in particular relates to a method for preparing high-performance ultrafine hard alloy. Background technique [0002] Cemented carbide is widely used in modern tool materials, The development of mold materials, drilling tools and wear-resistant parts materials occupies an important position, and is widely used in military industry, aerospace, machining, metallurgy, oil drilling, electronic communication and other fields. With the continuous and rapid development of the economy, high-tech content and high-quality and stable ultra-fine cemented carbide will inevitably occupy an important position in the development of high-tech weapons and equipment, cutting-edge science and technology, and nuclear energy in the future. [0003] When preparing cemented carbide, the particle size of cemented carbide prepared by traditional methods is always larger than its original particle size (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/08
Inventor 胡文萌赵志伟陈飞晓任凤庆刘晓芳
Owner 杭州华钻新材料科技有限公司