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Production method of twin-structure hard alloy matrix

A technology of cemented carbide substrate and production method, applied in the field of cemented carbide substrate, can solve the problems of inapplicability, large proportion of fine tungsten carbide, high hardness and the like

Inactive Publication Date: 2015-06-03
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The fine tungsten carbide they use has a large specific gravity. If such an alloy is applied to the coating alloy matrix, it will cause early cutting failure of the coating alloy due to its high hardness and low strength. Therefore, the twin crystal structure of the prior art is hard Proposed ratio of coarse to fine tungsten carbide for alloys not suitable for steel turning coated inserts
At the same time, these patents only involve the preparation method of cemented carbide with twin crystal structure or heterogeneous structure, and do not involve the application of cemented carbide with twin crystal structure in the field of steel turning coated inserts

Method used

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  • Production method of twin-structure hard alloy matrix
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  • Production method of twin-structure hard alloy matrix

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Embodiment 1

[0027] A production method of a twin crystal structure cemented carbide substrate, which comprises the steps of:

[0028] 1, batching: prepare compound according to the component of embodiment 1 in table 1;

[0029] 2. Ball milling: mill the above mixture in a ball mill; the milling time is 48 hours.

[0030] 3. Granulating, granulating the mixture after ball milling;

[0031] 4. Compression molding, pressing the mixture into alloy semi-finished products in the desired shape;

[0032] 5. Sintering, put the semi-finished product in a sintering furnace and sinter it with hydrogen dewaxing and positive pressure at 1460-1480°C; obtain a cemented carbide matrix. The metallographic photo of the cemented carbide substrate magnified 1500 times is as follows figure 1 .

[0033] 6. The cemented carbide substrate is subjected to CVD coating after surface treatment. SEM photographs of coated alloys as figure 2 shown. Coatings include:

[0034] The first layer (adjacent to the cem...

Embodiment 2

[0042] The production method of the twin crystal structure cemented carbide substrate of the present invention, except following steps, other is with embodiment 1:

[0043] 1, batching: prepare compound according to the component of embodiment 2 in table 1;

[0044] 6. The cemented carbide substrate is subjected to CVD coating after surface treatment. Coatings include:

[0045] The first layer (adjacent to the cemented carbide substrate) is a TiN layer with a thickness of 0.1-1 μm, equiaxed grains, and an average grain size ≤ 0.5 μm;

[0046] The second layer is a Ti(C,N) layer deposited by medium-temperature CVD, with a thickness of 6-9 μm, columnar crystals, and an average grain size of 0.5-2 μm;

[0047] The third layer is a TiCNO transition layer with a thickness of 0.1-1 μm, equiaxed grains, and an average grain size of ≤0.5 μm;

[0048] The fourth layer is ɑ-Al 2 o 3 layer, thickness 4-5.5 μm, equiaxed grains, average grain size 0.5-2 μm;

[0049] The fifth layer i...

Embodiment 3

[0055] The production method of the twin crystal structure cemented carbide substrate of the present invention, except following steps, other is with embodiment 1:

[0056] 1, batching: prepare compound according to the component of embodiment 3 in table 1;

[0057] 6. The cemented carbide substrate is subjected to CVD coating after surface treatment. Coatings include:

[0058] The first layer (adjacent to the cemented carbide substrate) is a TiN layer with a thickness of 0.1-1 μm, equiaxed grains, and an average grain size ≤ 0.5 μm;

[0059] The second layer is a Ti(C,N) layer deposited by medium-temperature CVD, with a thickness of 8-12 μm, columnar crystals, and an average grain size of 0.5-2 μm;

[0060] The third layer is a TiCNO transition layer with a thickness of 0.1-1 μm, equiaxed grains, and an average grain size of ≤0.5 μm;

[0061] The fourth layer is ɑ-Al 2 o 3 Layer, thickness 4-7μm, equiaxed grains, average grain size 0.5-2μm;

[0062] The fifth layer is a T...

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Abstract

The invention discloses a production method of a twin-structure hard alloy matrix, which comprises the following steps: proportioning, ball milling, granulating, pressure molding, sintering and the like. The WC adopted in the proportioning step is composed of 17 wt% of coarse-grain WC and 3 wt% of fine-grain WC. The tungsten carbide crystal grains in the twin-structure hard alloy prepared by the method have two grain sizes, and the coarse-grain tungsten carbide is uniformly distributed in the fine-grain tungsten carbide. The coarse-grain tungsten carbide has the advantages of complete crystal, fewer defects and fewer borders. The higher-proportion coarse-grain tungsten carbide provides favorable tipping resistance for the matrix material; and the fine-grain tungsten carbide provides favorable wearability for the matrix. Therefore, by adopting the coarse / fine tungsten carbide proportion, the matrix material has favorable comprehensive properties, and can be used in the field of steel turning coated tips.

Description

technical field [0001] The invention relates to a cemented carbide substrate of a steel turning coating, in particular to a production method of a double crystal structure cemented carbide substrate. Background technique [0002] When cutting metal at high speed, the main cause of tool damage is the wear and damage caused by mechanical friction, bonding, chemical wear, chipping, crushing and plastic deformation under the action of cutting force and cutting temperature. Therefore, the most important performance requirements for high-speed cutting tool materials are heat resistance, wear resistance, chemical stability, thermal shock resistance, and coating crack resistance. [0003] Coated tools have strong oxidation resistance and anti-bonding properties, so they have good wear resistance and crater wear resistance. The friction coefficient of the coating is low, which can effectively reduce the cutting force and cutting temperature during cutting, thus greatly improving the...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/08
Inventor 王培曾伟王俊波牟伟旭李清红郭华江
Owner ZIGONG CEMENTED CARBIDE CORP
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