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Preparation method of nanoscale hard alloy

A cemented carbide and nano-scale technology, applied in the field of cemented carbide, can solve the problems of dependence on imports, low tool life, poor surface finish, etc., and achieve the effects of complete metallographic structure, increased cutting speed, and poor surface finish

Inactive Publication Date: 2015-04-01
JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the domestic processing of high-hardness and ultra-micro-diameter cemented carbide solid tools basically relies on imports. The main reason is that nano-scale WC cannot be produced in China, and the production of cemented carbide is difficult, and the cemented carbide material cannot meet the requirements.
For processing high-hardness materials, cemented carbide with a grain size of about 0.5 microns is used. The service life of the processed tools and other materials is low, and the surface finish is poor. Due to the large wear of the tools, the dimensional accuracy of the materials can be low.

Method used

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  • Preparation method of nanoscale hard alloy

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Embodiment 1

[0013] A preparation method of nanoscale hard alloy. WC powder with nanoscale Fsss particle size of 0.2 μm, Co powder with Fsss particle size of less than 0.8 μm, and a small amount of inhibitor are used as raw materials. The materials are prepared in a mass ratio of 90:9:1, and the mass ratio of vanadium carbide and chromium carbide is 1:2, including WC powder 180KG, Co powder 18KG, vanadium carbide 0.8KG and chromium carbide 1.6KG). Use a 300L wet mill for ball milling, the mass ratio of ultrafine cemented carbide balls to materials is 5.5:1, and the ball milling time is 76 hours. Then the ball milled materials are spray-dried and granulated, and then pressed into standard samples before sintering. The sintering temperature 1390°C, sintering time 1h, sintering pressure 9MPa. Through this embodiment, nanoscale cemented carbide with a grain size of less than 0.4 μm can be prepared.

Embodiment 2

[0015] WC powder with nano-scale Fsss particle size of 0.2 μm, Co powder with Fsss particle size of less than 0.8 μm, and a small amount of inhibitor are used as raw materials, and the materials are prepared according to the mass ratio of 90:9:1. The mass ratio of vanadium carbide and chromium carbide It is 1:2, including WC powder 180KG, Co powder 18KG, vanadium carbide 0.8KG and chromium carbide 1.6KG. Use a 300L wet mill for ball milling, the mass ratio of ultrafine cemented carbide balls to materials is 5.5:1, and the ball milling time is 74 hours. Then the ball milled materials are spray-dried and granulated, and then pressed into standard samples before sintering. The sintering temperature 1385°C, sintering time 70min, sintering pressure 9MPa. Through this embodiment, nanoscale cemented carbide with a grain size of less than 0.4 μm can be prepared.

[0016] The physical properties of nanoscale cemented carbide alloys are shown in the table below.

[0017]

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Abstract

The invention discloses a preparation method of a nanoscale hard alloy. According to the preparation method, the nanoscale hard alloy with a grain size less than 0.4 micrometer is prepared through the procedures of blending, ball-milling, spray-drying, extrusion forming and pressure sintering by taking WC powder with a Fsss particle size less than 0.2 micrometer and Co powder with a Fsss particle size less than 0.8 micrometer as raw materials and vanadium carbide and chromium carbide as inhibitors. The nanoscale hard alloy is integral in metallographic structure, has the characteristics of high hardness, high strength and the like, and can be used for processing a high-hardness material with HRC hardness higher than 60 degrees; in addition, a cutter processed by adopting the nanoscale hard alloy can be prolonged in service life by nearly 30% and increased in cutting speed by 10%.

Description

technical field [0001] The invention belongs to the technical field of hard alloys, and in particular relates to a preparation method of nanoscale hard alloys. Background technique [0002] The nano-scale cemented carbide solid cutter is mainly used to process difficult-to-machine materials with HRC hardness >60°, and the diameter of the cutter can be ￠<0.15mm. At present, the domestic processing of high-hardness and extremely micro-diameter cemented carbide solid tools basically relies on imports. The main reason is that nano-scale WC cannot be produced in China, and the production of cemented carbide is difficult, and the cemented carbide material cannot meet the requirements. For processing high-hardness materials, cemented carbide with a grain size of about 0.5 microns is used. The tool and other materials processed have low service life and poor surface finish. Due to the large wear of the tool, the dimensional accuracy of the material can be low. In view of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04
Inventor 刘海军
Owner JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP
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