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Bicrystal structure anticorrosion hard alloy and preparation method thereof

A technology of hard alloy and double crystal structure, which is applied in the field of double crystal structure corrosion-resistant hard alloy and its preparation, can solve the problems that the distribution of chromium carbide cannot be absolutely uniform and the corrosion resistance of hard alloy is poor, and the preparation method is simple , low cost, good overall performance

Inactive Publication Date: 2014-12-17
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because cobalt (Co) as a cemented carbide has a congenital defect - poor corrosion resistance, although the corrosion resistance of the alloy can be improved to a certain extent by adding a small amount of chromium carbide, on the one hand, due to the distribution of chromium carbide, it cannot be achieved. Absolutely uniform, on the other hand, its addition is generally less than 1.0%, so the addition of chromium carbide cannot fundamentally solve the problem of poor corrosion resistance of cemented carbide, which limits its application in certain corrosive environments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The preparation method of the present invention is to directly prepare twin-crystal corrosion-resistant cemented carbide by ball milling process, mix tungsten carbide powder and nickel powder according to a certain weight ratio, add molding agent paraffin, grinding aid stearic acid, and Mix ball milling in alkane medium, filter and dry the mixed material after ball milling, spray granulation, and then press molding, place the semi-finished product in a hydrogen carrier gas dewaxing-low pressure sintering integrated furnace for pressure sintering, the specific steps are as follows:

[0029] Step 1 Ingredients

[0030] Two kinds of tungsten carbide powders with a grinding state Fischer particle size of 5.0-6.0 μm and 0.7-0.9 μm in a ratio of 7:3 and -300 mesh nickel powder are mixed by weight;

[0031] Step two ball milling

[0032] Add 200ml of hexane, 1-2.5 parts of molding agent paraffin, and 0.05-0.15 parts of grinding aid stearic acid per kilogram of the mixture in ...

Embodiment 1

[0039] In this example, the specific ratio of the twin crystal corrosion-resistant hard alloy is: 66 parts of coarse tungsten carbide powder with a Fischer grain size of 5.0 μm; 28 parts of fine tungsten carbide powder with a Fischer grain size of 0.7 μm, and 6 parts of nickel powder Parts, the total amount is 100 parts. Add 1 part of paraffin and 0.05 part of stearic acid additionally.

[0040] The concrete steps of preparation method are as follows:

[0041] Step 1 Ingredients

[0042] Two kinds of tungsten carbide powders with a grinding state Fischer particle size of 5.0 μm and 0.7 μm in a ratio of 7:3 and -300 mesh nickel powder are mixed according to the above weight ratio;

[0043] Step two ball milling

[0044] Add 200ml of hexane, 1 part of paraffin, and 0.05 part of stearic acid to the above-mentioned ingredients, put them into a cemented carbide ball mill bucket and carry out rolling ball milling together. The ball milling balls are YG6 cemented carbide balls of ...

Embodiment 2

[0050] In this example, the specific ratio of the twin-crystal corrosion-resistant cemented carbide is: 64 parts of coarse tungsten carbide powder with a Fischer particle size of 5.5 μm; 29 parts of fine tungsten carbide powder with a Fischer particle size of 0.8 μm, and 7 parts of nickel powder Parts, the total amount is 100 parts. Add 1.5 parts of paraffin and 0.10 parts of stearic acid additionally.

[0051] The concrete steps of preparation method are as follows:

[0052] Step 1 Ingredients

[0053] Two kinds of tungsten carbide powders with a grinding state Fischer particle size of 5.5 μm and 0.8 μm in a ratio of 7:3 and -300 mesh nickel powder are mixed according to the above weight ratio;

[0054] Step two ball milling

[0055] Add 200ml of hexane, 1.5 parts of paraffin, and 0.10 parts of stearic acid to the above-mentioned ingredients, put them into a cemented carbide ball mill bucket for rolling ball milling, and the balls are Φ10mm YG6 cemented carbide balls. 4:1...

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Abstract

The invention provides a bicrystal structure anticorrosion hard alloy and a preparation method thereof. The hard alloy is prepared by the following steps: taking hard tungsten carbide (WC) and binding phase nickel (N) as the matrix, and then subjecting the matrix to steps of blending, ball-milling, pressing, and sintering so as to obtain the hard alloy; wherein the tungsten carbide (WC) is composed of coarse particles and fine particles, and the weight ratio of the coarse WC particles to the fine WC particles is 7:3. The preparation method has the advantages of simple technology and low cost, and the prepared bicrystal structure anticorrosion hard alloy has the advantages of wear resistance, impact resistance, corrosion resistance, good comprehensive property, and suitability for being applied to fields such as petroleum exploitation, water treatment, and the like.

Description

technical field [0001] The invention belongs to a hard alloy and a manufacturing method thereof, in particular to a double crystal structure corrosion-resistant hard alloy and a preparation method thereof. Background technique [0002] At present, there is a certain basis for the development of twin-crystal structure cemented carbide materials, including simply changing the twin-crystal ratio to obtain excellent comprehensive performance or adding a small amount of carbides of trace elements such as chromium carbide to improve the hardness of WC-Co. The overall performance and corrosion resistance of high-quality alloys. For example, the Chinese patent "Heterogeneous cemented carbide and its preparation method" with the patent number of 201010210967 and the "Preparation method of a non-uniform cemented carbide" with the patent number of 200710035295 are obtained by simply changing the twin crystal ratio. Excellent comprehensive performance. The patent number is 20081014338...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05
Inventor 时凯华董凯林江庆
Owner ZIGONG CEMENTED CARBIDE CORP
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