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WC-9Ni-0.57Cr hard alloy

A wc-9ni-0.57cr, cemented carbide technology, applied in the field of cemented carbide materials, can solve the problems of poor corrosion resistance and oxidation resistance, and achieve the effect of improving corrosion resistance and bending strength

Inactive Publication Date: 2019-04-19
杨晶
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with WC-Ni alloy, WC-Co alloy has poor corrosion resistance and oxidation resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0016] The raw materials for the preparation of WC-9Ni-0.57Cr hard alloy include: WC-9Ni-0.57Cr and WC-6Co hard alloy. The preparation steps of WC-9Ni-0.57Cr hard alloy are as follows: weighing and processing the raw material alloy according to the experimental design scheme, and then grinding the surface of the sample, and the grinding device is a diamond grinding disc. Put the polished sample into acetone and absolute ethanol for cleaning to remove surface impurities. Then dry for later use. The detection steps of WC-9Ni-0.57Cr cemented carbide are as follows: the surface analysis adopts KYKY2800 scanning electron microscope, the fracture analysis adopts JSM5600V scanning electron microscope, the transverse fracture strength test adopts CS4100 electronic universal testing machine, and the electrochemical experiment adopts Solar1287 type electrochemical comprehensive tester.

Embodiment example 2

[0018] After corroding WC-6Co alloy at room temperature and 90°C for 8 weeks, the corrosion rates were 0.0061mm / a and 0.0405mm / a, respectively, and the corrosion rate at 80°C was about 3.5 times that at room temperature. After corroding WC-9Ni-0.57Cr alloy at room temperature and 80°C for 8 weeks, the corrosion rates were 0.0022mm / a and 0.0076mm / a respectively, and the corrosion rate at 80°C was slightly twice that at room temperature. The corrosion rate of the two alloys at two temperatures has roughly the same trend with corrosion time. After the alloy was soaked for 1 week, the corrosion rate decreased sharply; with the prolongation of time, the corrosion rate gradually decreased and tended to be slow. This is because the surface of the sample is relatively clean at the beginning, and the area of ​​the alloy exposed to the corrosive medium is relatively large. When the corrosion begins, the medium has more opportunities to erode the alloy, which promotes the dissolution proc...

Embodiment example 3

[0020] The corrosion rate of WC-9Ni-0.57Cr cemented carbide in 2.4% NaCl simulated seawater solution for 8 weeks at room temperature is 0.0022mm / a, which has strong corrosion resistance. The corrosion resistance of the cemented carbide added with Cr is greatly improved. During the sintering process, Cr dissolves in the binder phase and forms a passive film on the surface of the binder phase.

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Abstract

A WC-9Ni-0.57Cr hard alloy is developed in order to improve the hardness and the abrasion resistance of a WC-Ni hard alloy. A WC-9Ni-0.57Cr hard alloy and a WC-6Co hard alloy are adopted as raw materials, the prepared hard alloy has good anti-corrosion capacity, the corrosion rate of the WC-9Ni-0.57Cr hard alloy is 0.003 mm / a, the corrosion rate of the WC-6Co hard alloy is 0.009 mm / a, and it is shown that the anti-corrosion capacity of the WC-9Ni-0.57Cr hard alloy is higher. The microcosmic corrosion form shows corrosion of a binding phase. The hardness, the anti-corrosion degree and the bending strength of the prepared WC-9Ni-0.57Cr hard alloy are all greatly improved. A novel production process can be provided for preparing the high-performance WC-Ni hard alloy.

Description

Technical field [0001] The invention relates to a hard alloy material, in particular to a WC-9Ni-0.57Cr hard alloy. Background technique [0002] Due to its unique properties, such as high strength, high hardness, high Young's modulus and wear resistance, WC-Co cemented carbide is widely used in various industrial fields, including cutting tools, mining tools, wear-resistant parts etc. Compared with WC-Ni alloy, WC-Co alloy has poor corrosion resistance and oxidation resistance. When Ni is applied to cemented carbide as a new type of binder, it is necessary to add corrosion-resistant elements such as Cr and Mo to the alloy to further strengthen the binder phase and improve the corrosion resistance and oxidation resistance of the alloy. WC-Ni cemented carbide has the characteristics of high strength, high hardness, excellent wear resistance, heat resistance and good corrosion resistance, and is widely used in high pressure, high speed, high temperature, corrosive media and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08
CPCC22C29/08C22C29/067
Inventor 杨晶
Owner 杨晶
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