Unlock instant, AI-driven research and patent intelligence for your innovation.

A nanoscale ultrafine homogeneous hard alloy and its preparation method

A nano-scale, fine-scale technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of affecting the coercive force of the alloy, serious clamping, and affecting the quality of the alloy, so as to improve performance, reduce moisture absorption, and ensure quality. Effect

Active Publication Date: 2022-02-15
JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP HLDG CO LTD +2
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tungsten carbide powder is also a key factor in the preparation of alloys. Using traditional methods to prepare ultra-fine and nano-WC powders is often severely clamped, seriously affecting the coercive force of the alloy, and seriously affecting the quality of the alloy in the application of the alloy.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A nanoscale ultrafine homogeneous hard alloy and its preparation method
  • A nanoscale ultrafine homogeneous hard alloy and its preparation method
  • A nanoscale ultrafine homogeneous hard alloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] With a specific surface area of ​​4.0m 2 / g of WC powder and Co powder with a Fsss particle size of 0.6 μm are used as raw materials, and an inhibitor (a mixture of vanadium carbide and chromium carbide) is added. The materials are prepared at a mass ratio of 90:9:1, of which vanadium carbide and chromium carbide The mass ratio 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 the ball mill to the material is 5.5:1. The particle size of the ball mill and the particle size of the raw material powder are 0.4 μm. At the same time, paraffin wax molding agent and ethanol are used as the wet milling medium. The ball milling time is 70 hours, and then after ball milling The material was spray-dried and granulated, then pressed into a standard sample and then sintered. The sintering temperature was 1380°C, the sintering time was 1h, and the sintering pressure was 9MPa.

Embodiment 2

[0031] With a specific surface area of ​​4.0m 2 / g of WC powder and Co powder with a Fsss particle size of 0.6 μm are used as raw materials, and an inhibitor (a mixture of vanadium carbide and chromium carbide) is added. The materials are prepared at a mass ratio of 90:9:1, of which vanadium carbide and chromium carbide The mass ratio 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 the ball mill to the material is 5.5:1, the ball milling time is 76h, the particle size of the ball mill and the particle size of the raw material powder are 0.5μm, and paraffin wax molding agent and ethanol are used as the wet milling medium, and then the ball mill The material was spray-dried and granulated, then pressed into a standard sample and then sintered. The sintering temperature was 1380°C, the sintering time was 1h, and the sintering pressure was 9MPa.

Embodiment 3

[0033] With a specific surface area of ​​4.0m 2 / g WC powder of 1.46, Co powder with Fsss particle size of 0.6μm, as raw materials, add inhibitor (a mixture of vanadium carbide and chromium carbide), the materials are prepared according to the mass ratio of 90:9:1, wherein vanadium carbide and chromium carbide The mass ratio of 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 the ball mill to the material is 5.5:1. The particle size of the ball mill and the particle size of the raw material powder are 0.6 μm. At the same time, paraffin wax molding agent and ethanol are used as the wet milling medium. The ball milling time is 82 hours, and then the ball mill The material was spray-dried and granulated, then pressed into a standard sample and then sintered. The sintering temperature was 1380°C, the sintering time was 1h, and the sintering pressure was 9MP...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
particle sizeaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention discloses a nano-scale ultrafine homogeneous cemented carbide and a preparation method thereof, which belong to the field of cemented carbide. 2 / g of WC powder, Co powder with Fsss particle size <0.8μm as raw material, adding inhibitors, through batching, ball milling, spray drying, extrusion molding and pressure sintering, the nano-scale ultra-fine powder with a grain size of less than 0.2μm is obtained. hard alloy. The present invention can effectively avoid the oxidation and agglomeration of raw materials through the control of raw material storage mode and environmental temperature and humidity, and ensure the quality of raw materials; at the same time, the paraffin wax molding agent is used to replace the traditional PEG molding agent in the ball milling process , can effectively reduce the moisture absorption of the compact, and the ball mill is made of cemented carbide with a particle size similar to that of the powder, which reduces the coarseness caused by the penetration of the ball mill into the mixture, thus effectively improving the hardness and wear resistance of the cemented carbide.

Description

technical field [0001] The invention relates to the field of hard alloy preparation, in particular to a nanoscale ultrafine homogeneous hard alloy and a preparation method thereof. Background technique [0002] Nanocrystalline WC-Co cemented carbide has become the development direction of cemented carbide due to its double high characteristics (ie high strength and high hardness). It is widely used in various fields of modern technology and has been made into micro drills for processing integrated circuit boards, Dot matrix machine printing needles, overall hole processing tools, woodworking tools, precision molds, dental drills, tools for difficult-to-machine materials, etc. At present, the key to restricting high-performance cemented carbide rods in my country is high-performance ultra-fine / nano WC powder and inhibiting the abnormal growth of WC grains during sintering. How to obtain a uniform and defect-free cemented carbide microstructure is the key to the preparation Th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/08B22F1/00B22F9/04B22F3/14
CPCC22C1/051C22C29/08B22F9/04B22F3/14B22F2009/043B22F1/10
Inventor 梁瑜汤昌仁徐伟刘恒嵩陈玉柏覃伟坚鄢志刚
Owner JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP HLDG CO LTD