Production method for hard carbide with graded distributed cobalt content

A cemented carbide and gradient distribution technology, which is applied in the production field of cemented carbide with a gradient distribution of cobalt content, can solve the problems of preventing the alloy body from fully contacting with the carburizing atmosphere, high control precision and operation process control requirements, product quality and shape Problems such as poor precision and stability, to achieve the effect of improving mechanical performance and shape precision and its stability, high comprehensive mechanical performance and shape precision, and reducing the requirements for equipment and operation process control

Active Publication Date: 2004-12-29
ZIGONG CEMENTED CARBIDE CORP
View PDF0 Cites 40 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are: first, two-step sintering, long production cycle and high production cost; second, the use of Al 2 o 3 Filling with fine powder not only prevents the alloy body from fully contacting with the carburizing atmosphere, but also causes decarburization reaction with the sintered body; carburizing through gas carbon source requires high equipment control accuracy and operation process control, and the carburizing reaction activity is low. The carburizing time is long and the formation speed of the structural gradient is slow; the third is the quality and shape accuracy, poor stability, easy deformation and other side effects caused by the change of the organizational structure after carburizing and sintering-the formation of coba

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
  • Production method for hard carbide with graded distributed cobalt content
  • Production method for hard carbide with graded distributed cobalt content
  • Production method for hard carbide with graded distributed cobalt content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] This embodiment is an example with the cemented carbide of YG6T as the production grade:

[0016] A. Wet grinding of ingredients: Put 940 g of WC powder and 60 g of Co powder with a total carbon (C) content of 5.15 wt % into a 2L experimental ball mill, add absolute ethanol with a purity of 99.0%, and clarify after wet grinding for 36 hours; Then dry the clarified wet powder at 80°C for 30 minutes, grind the dry matter and pass through a 60-mesh sieve to obtain a wet-milled mixture;

[0017] B. Glue mixing: Add 110g of gasoline rubber solution (i.e. containing 11.0g of rubber) with a concentration of 10% into the above-mentioned wet grinding mixture, mix well and then dry at 100°C. After the dry matter is crushed with a 60-mesh sieve, Get the glue-mixed mixture;

[0018] C. Molding: Put the rubber mixed material in the A118A blade and alloy strip die respectively, and press it under 220KN pressure to form A11gA blade blank and 5.25×6.50×20.00 YG6T cemented carbide stri...

Embodiment 2

[0025] This embodiment is an example with the cemented carbide of YG13T as the production grade:

[0026] Mix 870g of low-carbon WC powder and 130g of Co powder into 1.0kg of a mixture with a total C content of 4.8% and a Co content of 13%, and place it in a 2L experimental ball mill for wet grinding for 40 hours; All with embodiment 1 same. The obtained 5.25×6.50×20.00 cemented carbide strip and A118A blade are tested by physical and mechanical properties, and their comprehensive mechanical properties are much higher than those of YG13 cemented carbide produced by traditional methods.

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
Bending strengthaaaaaaaaaa
Densityaaaaaaaaaa
Login to view more

Abstract

The hard alloy producing process includes compounding material, wet milling, adding glue, molding to form, loading the plain blank into boat, covering with pure carbon black, sintering in sintering furnace under the protection of hydrogen, and post-treatment to eliminate internal stress and to obtain the hard alloy with gradiently distributed Co content. Owing to the sintering and carburizing with pure carbon black as carburizing agent and the increased post-treatment step, the advanced technological process has high reliability, strong carburizing reaction activity, simple operation process, obvious Co content gradient in the hard alloy product, high comprehensive mechanical performance, low production cost, and other advantages.

Description

technical field [0001] The invention belongs to a production method of hard alloy products, in particular to a production method of hard alloy products in which the content of cobalt element in the hard alloy body changes gradually from the surface to the inside. The method is especially suitable for the production and manufacture of tools and molds such as WC-Co cemented carbide blades (tools) and stretching molds, so as to improve their comprehensive mechanical properties. Background technique [0002] Conventional WC-Co hard alloy blades, drill teeth, rock cutting and wire drawing dies have uniform internal and external metallographic structures and consistent mechanical properties. This kind of cemented carbide products with uniform structure has a contradiction between high hardness and wear resistance and toughness that is difficult to reconcile, that is, when the content of cobalt (Co) in the alloy is reduced to improve its hardness and wear resistance, the alloy body...

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): C22C1/04C22C29/08
Inventor 张继芳熊继芶立周永贵
Owner ZIGONG CEMENTED CARBIDE CORP
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