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Corrosion-resistant hard alloy and preparation method thereof

A cemented carbide and corrosion-resistant technology, which is applied in the field of powder metallurgy, can solve the problems of poor corrosion resistance of cemented carbide materials, hinder the sintering densification process, and damage the corrosion resistance of alloys, and achieve strong corrosion resistance and fast Realize industrial production and strong anti-corrosion effect of molten Zn liquid

Active Publication Date: 2013-07-03
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can improve the corrosion resistance of cemented carbide to a certain extent, but at the same time, they also bring new problems, such as the wettability of Ni and WC is not as good as that of Co, resulting in a decrease in the flexural strength of the prepared alloy and large fluctuations in performance; The increase of Al content in the alloy will hinder the sintering densification process and increase the porosity of the alloy, while the increase in porosity will reduce the strength of the alloy and damage the corrosion resistance of the alloy
In addition, due to the small amount of metal elements added in the alloy (generally less than 2%), there are prone to problems such as segregation and uneven distribution, resulting in poor corrosion resistance of the cemented carbide material as a whole

Method used

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  • Corrosion-resistant hard alloy and preparation method thereof
  • Corrosion-resistant hard alloy and preparation method thereof
  • Corrosion-resistant hard alloy and preparation method thereof

Examples

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Embodiment 1

[0014] Take blue tungsten (molecular formula is WO 2.9 ), cobalt oxide (molecular formula is Co 3 o 4 ) and carbon black (C) as raw materials, according to the final preparation of WC-η cemented carbide, the η phase composition is Co 6 W 6 C and the requirement that the mass fraction is 10% calculate the proportioning ratio of the above three raw materials, then mix the raw materials by ball milling in proportion, use absolute ethanol as the ball milling medium, and the ball milling time is 10 hours, and the mixed powder after ball milling is in the drying box to dry in. Put the dried mixed powder in a vacuum furnace for chemical reaction. The temperature of the vacuum furnace is 800°C, and the holding time is 1.5 hours. After the reaction, WC-Co 6 W 6 C composite powder. In the prepared WC-Co 6 W 6 Add polyethylene glycol molding agent to the C composite powder for mixing, then press it into a compact, sinter at a temperature of 1380°C, keep it warm for 1.5 hours, and...

Embodiment 2

[0016] Take blue tungsten (molecular formula is WO 2.9 ), cobalt oxide (molecular formula is Co 3 o 4 ) and carbon black (C) as raw materials, according to the final preparation of WC-η cemented carbide, the η phase composition is Co 6 W 6 C and the requirement that the mass fraction is 30% calculate the proportioning ratio of the above three raw materials, then mix the raw materials by ball milling in proportion, use absolute ethanol as the ball milling medium, and the ball milling time is 15 hours, and the mixed powder after ball milling is in the drying box to dry in. Put the dried mixed powder in a vacuum furnace for chemical reaction. The temperature of the vacuum furnace is 900°C, and the holding time is 1 hour. After the reaction, WC-Co 6 W 6 C composite powder. In the prepared WC-Co 6 W 6 Add polyethylene glycol molding agent to the C composite powder for mixing, then press it into a compact, sinter at a temperature of 1400°C, keep it warm for 1 hour, and after...

Embodiment 3

[0018] Take blue tungsten (molecular formula is WO 2.9 ), cobalt oxide (molecular formula is Co 3 o 4 ) and carbon black (C) as raw materials, according to the final preparation of WC-η cemented carbide, the η phase composition is Co 6 W 6 C and the requirement that the mass fraction is 40% calculate the proportioning ratio of the above three raw materials, then mix the raw materials by ball milling in proportion, use absolute ethanol as the ball milling medium, and the ball milling time is 20 hours, and the mixed powder after ball milling is in the drying box to dry in. Put the dried mixed powder in a vacuum furnace for chemical reaction. The temperature of the vacuum furnace is 1000°C, and the holding time is 0.5 hours. After the reaction, WC-Co 6 W 6 C composite powder. In the prepared WC-Co 6 W 6 Add polyethylene glycol molding agent to the C composite powder for mixing, then press it into a compact, sinter at a temperature of 1420°C, keep it warm for 0.5 hours, an...

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Abstract

The invention provides corrosion-resistant hard alloy and a preparation method thereof, which belong to the technical field of powder metallurgy. The metal Co in WC-Co hard alloy is replaced by Eta-phase, the mass fraction of the Eta-phase is controlled to 10-40%, and the Eta-phase is Co3W3C or Co6W6C. The preparation method comprises the following steps of: by taking tungsten blue, cobaltous oxide and carbon black as raw materials, carrying out ball-milling and mixing in proportion; putting in a vacuum furnace for chemical reaction, thus obtaining WC-Eta composite powder; and adding a polyethylene glycol molding agent to the WC-Eta composite powder, mixing, pressing powder into briquettes, and finally sintering. The hard alloy provided by the invention resists acid and alkali corrosion and has good capacity of resisting molten zinc etching.

Description

technical field [0001] The invention relates to a corrosion-resistant cemented carbide material and a preparation method, belonging to the technical field of powder metallurgy. Background technique [0002] Cemented carbide materials occupy an important position in the field of engineering materials such as cutting tools, mining tools, molds and wear-resistant parts due to their high hardness, wear resistance and fracture strength. With the rapid development of modern industrial technology, higher requirements are put forward for its performance in practical applications. For working conditions where there are corrosive media (such as various acidic and alkaline media, molten zinc liquid, aluminum liquid, etc.) , leading to premature failure of the material. Therefore, it is urgent to develop a new type of cemented carbide material with both corrosion resistance and wear resistance. [0003] Among the most widely used WC-Co cemented carbide materials, Co is the binder of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/06C22C1/04
Inventor 宋晓艳王海滨郭广生
Owner BEIJING UNIV OF TECH