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

Method for synthesizing and preparing hard alloy powder by mixing original powder and regenerated powder

A cemented carbide and mixed powder technology, which is applied in the field of cemented carbide and powder metallurgy, can solve problems such as difficulty in mixing primary powder and recycled powder uniformly, reducing the overall performance of bulk cemented carbide, and unfavorable industrial application of recycled materials, etc., to achieve Excellent bending strength, easy to break, and eliminate the effect of segregation

Active Publication Date: 2014-03-26
BEIJING UNIV OF TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The serious disadvantage of this method is that it is difficult to mix the primary powder and the regenerated powder evenly, and the aggregation of the regenerated WC powder will obviously reduce the overall performance of the prepared block cemented carbide. More importantly, this method seriously affects the stability of the product. Conducive to the industrial application of recycled materials

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 synthesizing and preparing hard alloy powder by mixing original powder and regenerated powder
  • Method for synthesizing and preparing hard alloy powder by mixing original powder and regenerated powder
  • Method for synthesizing and preparing hard alloy powder by mixing original powder and regenerated powder

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0045] Example 1: The final product is WC-8wt.%Co (n=8) mixed powder with a recycled powder content of 10% (m=10) and the cemented carbide block material obtained by sintering this as a raw material. According to the requirements of the regenerated powder content and the Co content in the final WC-8wt.%Co mixed powder, according to the condition of n=p=8, according to the regenerated oxide mixture (WO 3 +CoWO 4 ), native WO 2.9 , native Co 3 o 4 The mass ratio of carbon black and carbon black is 1:8.1:0.8:2.0 for batching and ball milling; after ball milling, the powder is dried, and the final WC-Co mixed powder is prepared by reduction carbonization reaction in a vacuum furnace. The specific process parameters are: the gas pressure is less than 0.01Pa, the heating rate is 10°C / min, the reaction temperature is 1100°C, and the temperature is kept for 2 hours. The XRD pattern of the prepared final WC-Co mixed powder is shown in figure 1 (b), whose scanning electron micrograp...

example 2

[0048] Example 2: The final product is WC-6wt.%Co (n=6) mixed powder with a recycled powder content of m%=40%, and it is used as a raw material to sinter to obtain a cemented carbide block material. According to the requirements of the regenerated powder content and the Co content in the WC-6wt.%Co powder and the condition of n3 +CoWO 4 ), native WO 2.9 , native Co 2 o 3 The mass ratio of carbon black and carbon black is 1:2.3:0.14:0.50 for batching and ball milling; after ball milling, the powder is dried, and the final WC-6wt.%Co mixed powder is prepared by reduction carbonization reaction in a vacuum furnace. The specific process parameters are: the gas pressure is less than 0.01Pa, the heating rate is 20°C / min, the reaction temperature is 1080°C, and the temperature is kept for 1.5 hours. The XRD pattern of the prepared final WC-Co mixed powder is shown in figure 1 (c), its scanning electron micrograph is shown in figure 2 (b), 5 parts were randomly taken from the fin...

example 3

[0050] Example 3: The final product is WC-16wt.%Co (n=16) mixed powder with recycled powder content of 20% (m=20). According to the requirements of the regenerated powder content and the Co content in WC-16wt.%Co powder, according to the condition of n>p=8, according to the regenerated oxide mixture (WO 3 +CoWO 4 ), native WO 3 , native Co 3 o 4 The mass ratio of carbon black and carbon black is 1:3.4:0.8:0.9 for batching and ball milling; after ball milling, the powder is dried, and the reduction carbonization reaction is carried out in a vacuum furnace to prepare the final WC-16wt.%Co mixture containing 20% ​​recycled powder pink. The specific process parameters are: the gas pressure in the furnace is less than 0.01Pa, the heating rate is 15°C / min, the reaction temperature is 1200°C, and the heat preservation is 3 hours. The XRD pattern of the prepared final WC-Co mixed powder is shown in figure 1 (d), whose scanning electron micrograph is shown in figure 2 (c), 5 par...

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
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for synthesizing and preparing hard alloy powder by mixing original powder and regenerated powder and belongs to the technical field of the hard alloy and powder metallurgy. The method comprises the following steps of: oxidizing WC-Co waste hard alloys with different Co content to form a regenerated WC-Co oxide mixture; measuring the WO3 content in the regenerated WC-Co oxide mixture; according to the requirements of the Co content and the regenerated powder content in final state WC-Co mixed powder, adding native tungsten oxide, native cobalt oxide and carbon black required for implementing the requirement on the components of a final product into the regenerated WC-Co oxide mixture; carrying out ball mill mixing; and then performing the in-situ reduction and carburization reaction in the vacuum environment to obtain the hard alloy powder. According to the product obtained by the method disclosed by the invention, the native materials and the regenerated materials are totally and uniformly mixed, so that the stability of the product quality is improved and the components are accurate and controllable.

Description

technical field [0001] The invention belongs to the technical field of cemented carbide and powder metallurgy, and in particular relates to a method for synthesizing and preparing WC-Co powder mixed with virgin powder and regenerated powder. Background technique [0002] Cemented carbide is known as the "teeth" of modern industry, with an annual usage of about 150 million tons. The original WC powder relies on the mining of mines and a series of chemical reactions to synthesize and prepare, which consumes a large amount of non-renewable tungsten and cobalt mineral resources, and the acid solution, sewage, harmful gases, etc. discharged during the cemented carbide preparation process cause a series of environmental problems and natural pollution. ecological destruction. Regenerated WC powder is made of waste cemented carbide as raw material, through certain physical or chemical treatment, to prepare a powder material that can partially or completely replace the original ceme...

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): B22F9/20B22F9/16
Inventor 刘雪梅宋晓艳魏崇斌王瑶聂祚仁王海滨付军高杨
Owner BEIJING UNIV OF TECH
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