Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing Ni cementing WC base cemented carbide

A technology of cemented carbide and mixed powder, applied in the field of preparation of WC-based cemented carbide, can solve problems such as limitations, and achieve the effects of improving solubility, improving impact resistance, and improving strengthening effect.

Inactive Publication Date: 2010-12-15
SICHUAN UNIV
View PDF1 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the Ni-generation Co cemented carbide has been mainly used in wear-resistant parts, mining tools and other fields or other occasions with low requirements.
However, the gap between Ni-generation Co cemented carbide and traditional cemented carbide in terms of hardness and wear resistance limits its application in typical cemented carbide products (such as cutting tools) that are used in large quantities.

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
  • Method for preparing Ni cementing WC base cemented carbide
  • Method for preparing Ni cementing WC base cemented carbide

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] Example 1: The mixed powder whose composition is WC-6wt% Ni is wet-milled in a roller ball mill. High-quality alloy balls, the weight ratio of balls to materials is 5:1; the wet grinding medium is absolute ethanol, and 1.0-2.0wt% of forming agent polyethylene glycol is added, and the amount of absolute ethanol is 250-300ml / kg; filter and dry The final powder becomes TNMG220404-ZM under a pressure of 300-400MPa, and its weight is 13.4g; sintering is carried out in a vacuum furnace, and the release agent is carried out at a vacuum degree higher than 10-15Pa, at a temperature between 400°C and 600°C Heat preservation for 2-4h; sintering vacuum degree is higher than 1~5×10 -2 It is carried out under Pa, the sintering temperature is 1440°C-1480°C, and the holding time is 1-1.5h. During vacuum quenching, the nitrogen pressure is 0.1-0.4MPa, and the quenching time is 5-10 minutes; during cryogenic treatment, it is cooled to -150--196°C at a rate of 20-60°C / min; the holding ti...

example 2

[0016] Example 2: The mixed powder whose composition is WC-8wt% Ni is wet-milled in a roller ball mill, the ball milling speed is 50-80r / min, the grinding time is 48-56h, and the grinding ball is WC-8wt% Co hard with a diameter of Φ10mm. High-quality alloy balls, the weight ratio of balls to materials is 5:1; the wet grinding medium is absolute ethanol, and 1.0-2.0wt% of forming agent polyethylene glycol is added, and the amount of absolute ethanol is 250-300ml / kg; filter and dry The final powder is formed into WNMG120408-ZM under a pressure of 300-400MPa, and its weight is 9.8g; sintering is carried out in a vacuum furnace, and the release agent is carried out at a vacuum degree higher than 10-15Pa, at a temperature between 400°C and 600°C Heat preservation for 2-4h; sintering vacuum degree is higher than 1~5×10 -2 It is carried out under Pa, the sintering temperature is 1440°C-1480°C, and the holding time is 1-1.5h. During vacuum quenching, the nitrogen pressure is 0.1-0.4M...

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
breaking strengthaaaaaaaaaa
Login to View More

Abstract

The invention disclose a method for preparing a hard alloy by bonding WC group with Ni, which is characterized by comprising the steps that: firstly, the mixing powder of WC and Ni is subjected to wet grinding, drying and pressing in absolute ethyl alcohol, and then subjected to vacuum sintering at the temperature of 1440 DEG C to 1480 DEG C; when the sintering is finished, nitrogen is introducedto a furnace simultaneously for carrying out vacuum quenching, the pressure of the nitrogen is 0.1MPa to 0.4MPa, and the quenching time is 5min to 10min; after tapping, deep cooling treatment is carried out in liquid nitrogen, the treatment temperature is 150 DEG C to 196 DEG C, and the heat-preservation time is: the hard alloy weight multiplied by weight factor plus the Ni percent content of thehard alloy weight multiplied by component factor, wherein, the weight factor is 5min / g to 25min / g and the component factor is 10min to 20 min; and drawing temper is carried out in a vacuum furnace atthe temperature of 120 DEG C to 200 DEG C, the temperature-preservation time is 1h to 3h. By adopting the method for preparing the hard alloy by bonding the WC group with Ni, the contact ratio of theWC can be controlled, the solubility of the WC in Ni is improved, furthermore, the surface stress condition of the alloy after treatment is compressive stress which improves the shock resistance capability of the alloy, thus being capable of realizing the substitution of Ni to Co and obtaining the performances corresponding to WC-Co series hard alloys.

Description

technical field [0001] The invention relates to a method for preparing a hard alloy, in particular to a method for preparing a WC-based hard alloy using Ni as a binder. Background technique [0002] Since the invention of cemented carbide, Co has been the main binder of cemented carbide. Because Co has good wettability and adhesion to the hard phase WC, and the dissolution of C and W in Co makes the WC-Co-based cemented carbide have high hardness, high strength and high wear resistance. Co is a scarce strategic resource. At present, the world's Co reserves (excluding China) are about 4.5 million tons, and the reserve base is 9.6 million tons, and they are mainly distributed in African countries with political turmoil. The supply and demand conditions are complex and very unstable (China Non-political turbulence, supply difficulties; Russia's unstable economy, uncertain export prospects), resulting in large fluctuations in the price of Co. Furthermore, lung cancer has been ...

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): C22C1/05C22C29/08C22F1/16
Inventor 郭智兴熊计陈建中吴悦梅杨梅
Owner SICHUAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com