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

Method of firing low-cobalt fine-grain hard alloy by common sintering furnace

A technology of cemented carbide and sintering furnace, which is applied in the field of sintering low-cobalt fine-grained cemented carbide in ordinary sintering furnaces, can solve problems such as difficult control of product quality, and achieve the effect of reducing internal pores and reducing carbon loss in the furnace

Inactive Publication Date: 2018-12-25
自贡高科硬质合金有限公司
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for firing low-cobalt fine-grained hard alloys in ordinary sintering furnaces, which can effectively solve the problem that the product quality is difficult to control when firing low-cobalt fine-grained hard alloys in existing ordinary sintering furnaces

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] An embodiment of the method for firing low-cobalt fine-grained hard alloys in ordinary sintering furnaces, taking the firing of grade YG6X low-cobalt fine-grained Rare gases such as argon or helium are used for dewaxing. After dewaxing, the furnace is kept at 0.2 MPa for micro positive pressure sintering. / min heating rate for sintering, sintering temperature of 1430 ℃, 60 minutes of heat preservation.

[0017] After sintering by the above method, the cobalt magnetism is 5.2, and the porosity is A02B00. However, the cobalt magnetism is 4.2, and the product is seriously decarburized.

[0018] First use argon positive pressure to dewax, and after dewaxing, protect sintering with argon micro positive pressure. The sintering temperature is close to but lower than the eutectic point temperature. Keep it warm for a period of time. At this time, the product shrinks by 80%-90%. The surface energy decreases rapidly, and the sensitivity to oxygen is reduced. After cooling down, ...

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

The invention discloses a method of firing low-cobalt fine-grain hard alloy by a common sintering furnace. The method comprises the steps of adding a low-cobalt fine-grain hard alloy blank in the sintering furnace, and introducing an inertial gas to carry out dewaxing; after dewaxing, sintering at a sintering temperature 10-20 DEG C less than eutectic point temperature by keeping the inertial gasunder micro-positive pressure, and holding the temperature for 30-120 min; vacuumizing to carry out secondary sintering at 1380-1470 DEG C at the temperature rise speed of 5-20 DEG C / min for 60-120 min, and cooling to room temperature to finish sintering. Compared with conventional sintering methods, the method has the advantages that cobalt magnetism rises from 4.2 to 5.2, shrinkage of the primarily sintered product reaches 80-90%, grain surface energy drops quickly, sensitivity to oxygen decreases, secondary vacuum sintering after cooling may help reduce inter-furnace carbon loss via high temperature rise speed, inner gas can be removed, and inner porosity of the product is greatly decreased.

Description

technical field [0001] The invention relates to the field of hard alloy preparation, in particular to a method for firing low-cobalt fine-grained hard alloy in a common sintering furnace. Background technique [0002] In the production of cemented carbide products, the quality and stability of the products have very high requirements on the equipment. For the sintering furnaces with tens of millions of sintering furnaces, it is difficult for small-scale production enterprises to bear. For the old equipment, the stability of the equipment is poor, and the two-phase region of the low-cobalt fine-grain is narrow. Such equipment is difficult to stably burn qualified low-cobalt fine-grain products. The internal porosity of the product must be controlled by vacuum sintering in the first sintering, and the heating rate of the first sintering should not be too fast. Contents of the invention [0003] The purpose of the present invention is to provide a method for firing low-cobal...

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): C22C1/05C22C29/00B22F3/10
CPCC22C1/051B22F3/1017C22C29/005
Inventor 宋国民
Owner 自贡高科硬质合金有限公司
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