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Anti-corrosion anti-EDM-processing-cracking mixed crystal cemented carbide and manufacturing method

A hard alloy, corrosion-resistant technology, applied in the field of hard alloy manufacturing, can solve the problems of WC grain growth, alloy material cracking, easy cracking, etc., and achieve the effect of good processing cracking characteristics, stable quality and simple process

Active Publication Date: 2017-05-24
ZHUZHOU LIZHOU CEMENTED CARBIDE +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Nowadays, with the continuous improvement of mold precision and use requirements in aerospace, automobile, electronics, electromechanical and other industries, the advantages of high hardness and high strength of cemented carbide are favored by various mold industries, and more and more main jobs in molds Some of them have used cemented carbide to replace the original die steel (for example, the weight of cemented carbide material in a progressive die instead of die steel is hundreds of kilograms), these cemented carbide materials need to rely on EDM processing for final molding, This makes mold manufacturers have very strict requirements on the alloy materials used. During the corresponding EDM processing, the alloy materials are corroded by the processing current and coolant, which affects the precision of the mold. The cracking of the alloy material during the processing leads to the scrapping of the entire set of molds, which has become an urgent need. solved problem
At present, the main grades of domestic cemented carbide EDM processing plates are YG12, YG13, YG15, etc. In the production process of these grades, they are all produced with traditional single-size WC powder + Co, without considering the impact of current and coolant during EDM processing. Corrosion of alloy materials and easy cracking during processing. The disadvantage of a single powder is that it cannot make the material have the characteristics of high strength and high hardness at the same time, that is, it cannot make the product have the characteristics of wear resistance and impact resistance at the same time; and the bonding component is only Cobalt is an element, and the oxidation resistance and corrosion resistance of cobalt are poor, which leads to defects such as corrosion and cracking in alloy materials during EDM processing; at the same time, at high temperatures, WC grains dissolve in liquid cobalt, which is easy to cause Abnormal growth of WC grains
With the expansion of the scope of use of cemented carbide sheets processed by EDM and its application in various environments, it is difficult for domestic cemented carbide to meet the use requirements

Method used

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  • Anti-corrosion anti-EDM-processing-cracking mixed crystal cemented carbide and manufacturing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The corrosion-resistant and EDM-resistant mixed-crystal cemented carbide of this embodiment is composed of the main components: two types of WC with different particle sizes that are carbonized by high temperature reduction and high temperature as the composite hard phase, Co as the binder metal (bonding phase), Re is used as a corrosion-resistant trace element (anti-corrosion additive), and Ta is used as a trace element composition (prepared phase) to resist EDM processing cracking and prevent grain growth (prepared phase). The mass percentage of each component is:

[0025]

[0026] The above powders are mixed according to the proportion, and paraffin is added for molding, and alcohol is added to the mixture for ball milling, and then the obtained mixture is pressed into a blank for hot isostatic pressing (HIP) sintering at a sintering temperature of 1430°C and holding time for 60 minutes , That is, the corrosion-resistant and EDM-resistant mixed-crystal cemented carbide m...

Embodiment 2

[0028] The corrosion-resistant and EDM-resistant mixed-crystal cemented carbide of this embodiment is composed of the main components: two types of WC with different particle sizes that are carbonized by high temperature reduction and high temperature as the composite hard phase, Co as the binder metal (bonding phase), Re is used as a corrosion-resistant trace element (anti-corrosion additive), and Ta is used as a trace element composition (prepared phase) to resist EDM processing cracking and prevent grain growth (prepared phase). The mass percentage of each component is:

[0029]

[0030] The above powders are mixed according to the ratio, and paraffin is added to form, and alcohol is added to the mixture for ball milling, and then the obtained mixture is pressed into a blank for hot isostatic pressing (HIP) sintering, sintering temperature is 1420 ℃, holding for 70 minutes , That is, the corrosion-resistant and EDM-resistant mixed-crystal cemented carbide material of the presen...

Embodiment 3

[0032] The corrosion-resistant and EDM-resistant mixed-crystal cemented carbide of this embodiment is composed of the main components: two types of WC with different particle sizes that are carbonized by high temperature reduction and high temperature as the composite hard phase, Co as the binder metal (bonding phase), Re is used as a corrosion-resistant trace element (anti-corrosion additive), and Ta is used as a trace element composition (prepared phase) to resist EDM processing cracking and prevent grain growth (prepared phase). The mass percentage of each component is:

[0033]

[0034] Mix the above-mentioned powders according to the proportion, and add paraffin to form, and add alcohol medium to the mixture for ball milling, and then press the obtained mixture into a blank for hot isostatic pressing (HIP) sintering, the sintering temperature is 1410℃, and the holding time is 80 minutes. , That is, the corrosion-resistant and EDM-resistant mixed-crystal cemented carbide mater...

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Abstract

The invention relates to a cemented carbide manufacturing technology, in particular to anti-corrosion anti-EDM-processing-cracking mixed crystal cemented carbide and a manufacturing method. The anti-corrosion anti-EDM-processing-cracking high-performance mixed crystal cemented carbide is composed of, by mass percentage, a composite hard phase comprising 25-50% of WC with the particle size of 0.4-0.8 micrometers and 35-60 % of WC with the particle size of 1.0-2.5 micrometers, a binding phase comprising 10-15% of Co, a corrosion-resistant additive comprising 0.05-0.3% of Re and an inhibitor comprising 0.1-0.5 % of Ta and is manufactured through the processes of burdening, ball milling, blank manufacturing and sintering. The anti-corrosion anti-EDM-processing-cracking mixed crystal cemented carbide and the manufacturing method have the beneficial effects that the corrosion resistance of the cemented carbide is high, the anti-EDM-processing-cracking characteristic is good, the quality is stable, and the manufacturing method is convenient and reliable.

Description

Technical field [0001] The invention relates to a cemented carbide manufacturing technology, in particular to a mixed crystal cemented carbide that is corrosion-resistant and resistant to EDM processing cracking and a manufacturing method. Background technique [0002] Nowadays, with the continuous improvement of the precision and use requirements of the aerospace, automotive, electronics, electromechanical and other industries, the advantages of high hardness and high strength of cemented carbide are favored by various mold industries, and more and more molds are used in the main work Some have already used cemented carbide to replace the original mold steel (for example, the weight of the cemented carbide material to replace the mold steel in a set of progressive dies is hundreds of kilograms). These cemented carbide materials need to rely on EDM processing to form the final shape. This makes the mold manufacturers very demanding on the alloy materials used. During the correspo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05
CPCC22C1/051C22C29/08
Inventor 王曙宁代棋帆魏鹏飞
Owner ZHUZHOU LIZHOU CEMENTED CARBIDE