High-intensity high-tenacity super fine crystal WC-10Co hard alloy preparation method

A cemented carbide and high toughness technology, which is applied in the field of preparing high-strength and high-toughness ultra-fine-grained WC-Co cemented carbide materials to achieve high hardness

Active Publication Date: 2008-05-28
BEIJING UNIV OF TECH
View PDF0 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method has not been

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
  • High-intensity high-tenacity super fine crystal WC-10Co hard alloy preparation method
  • High-intensity high-tenacity super fine crystal WC-10Co hard alloy preparation method
  • High-intensity high-tenacity super fine crystal WC-10Co hard alloy preparation method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0014] Example 1: First, 0.5 micron WC powder and 0.5 micron Co powder were mixed and ball-milled, the ball-to-material ratio was 3:1, the ball-milling speed was 150 r / min, the ball-milling time was 24 hours, and the ball-milling medium was absolute ethanol. The ball-milled mixed powder is dried and then loaded into a graphite mold, pressure-molded, and placed in a vacuum furnace for vacuum pretreatment. The pretreatment temperature was 1300°C, and the holding time was 1 hour. After vacuum pretreatment, it is sent to the sintering chamber of the SPS system. The sintering process parameters are: sintering temperature of 1180° C.; sintering heating rate of 50° C. / min; sintering pressure of 80 MPa; The ultra-fine grained YG10 cemented carbide bulk material was prepared by the above process (see Figure 1 for the microstructure and Table 1 for the material performance parameters).

Example Embodiment

[0015] Example 2: First, 0.8-micron WC powder and 0.8-micron Co powder were mixed and ball-milled, the ball-to-material ratio was 1:1, the ball-milling speed was 250 r / min, the ball-milling time was 24 hours, and the ball-milling medium was absolute ethanol. The ball-milled mixed powder is dried and then loaded into a graphite mold, pressure-molded, and placed in a vacuum furnace for vacuum pretreatment. The pretreatment temperature was 1200°C, and the holding time was 1 hour. After vacuum pretreatment, it is sent to the sintering chamber of the SPS system. The sintering process parameters are: sintering temperature of 1200° C.; sintering heating rate of 100° C. / min; sintering pressure of 60 MPa; The ultra-fine grained YG10 cemented carbide bulk material was prepared by the above process (see Figure 2 for the microstructure and Table 1 for the material performance parameters).

Example Embodiment

[0016] Example 3: 1.0 micron WC powder and 1.0 micron Co powder were mixed and ball-milled first, the ball-to-material ratio was 1:1, the ball-milling speed was 250 r / min, the ball-milling time was 24 hours, and the ball-milling medium was anhydrous ethanol. The ball-milled mixed powder is dried and then loaded into a graphite mold, pressure-molded, and placed in a vacuum furnace for vacuum pretreatment. The pretreatment temperature was 1300°C, and the holding time was 1 hour. After vacuum pretreatment, it is sent to the sintering chamber of the SPS system. The sintering process parameters are: sintering temperature of 1180° C.; sintering heating rate of 80° C. / min; sintering pressure of 60 MPa; The ultra-fine grained YG10 cemented carbide bulk material was prepared by the above process (see Figure 3 for the microstructure and Table 1 for the material performance parameters).

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

No PUM Login to view more

Abstract

A process for preparing ultra-fine grain WC-10Co hard alloy which is high in density and ductility belongs to the field of powder metallurgy. WC-Co hard alloy of the prior art equipment is hard to obtain combination properties of high hardness, high density and high ductility. The steps of the invention includes that WC powder with particle size of 0.5-1.0 micrometers and Co powder with particle size of 0.5-1.0 micrometers are mixed to be ball ground according to the mass ratio, ball milling medium is anhydrous alcohol, the ball milling time is 24 hours, obtained mixed powder after being dried is arranged inside a die for cold-pressing, the mixed powder and the die are put into a vacuum furnace together for vacuum preprocessing, preserving heat for 1 hour with temperature of 1100-1300DEG C, and the mixed powder is put into a SPS device after the preprocessing. The processing parameters of sintering densification are that the final state sintering temperature is 1180-1210DEG C, the heating rate is 50-100DEG C/minute, the sintering pressure is 50-80MPa, and the preserving time is 10 minutes at the final state sintering temperature. Bulk materials prepared by the invention are approximately and completely densified, and the performance indexes of the rigidity, the intensity and the tenacity reach the international advanced level.

Description

technical field [0001] The invention discloses a new method for preparing high-strength and high-toughness ultra-fine-grained WC-Co cemented carbide materials, which belongs to the technical field of new powder metallurgy. Background technique [0002] The traditional coarse-grained WC-Co cemented carbide material is extremely difficult to achieve a high level of hardness, strength and toughness at the same time, so it is mostly used in fields that do not have strict performance requirements and have a large quantity and a wide range. Ultrafine (usually WC grain size less than 0.5 μm) cemented carbide with higher hardness, wear resistance, strength and toughness is widely used in many fields of metal processing industry, electronics industry, medical and urban construction. Such as micro-drills for integrated circuit boards, dot-matrix printing needles, and disc cutters for cutting the leads of printed circuit boards. Only ultra-fine cemented carbide materials can meet the r...

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
IPC IPC(8): C22C1/05C22C29/08B22F3/14
Inventor 宋晓艳赵世贤张久兴王明胜
Owner BEIJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap