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Three-dimensional orientation preparation method of wc alloy

An alloy, three-dimensional technology, applied in the field of three-dimensional directional preparation of WC alloys, can solve the problems of inability to prepare single-crystal polycrystalline WC alloys with excellent anisotropy, and achieve high strength, simple process flow, and convenient operation.

Inactive Publication Date: 2016-09-21
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to aim at the preparation of WC alloy by template grain growth method at present, through the action of gravity field, one direction of WC crystal grains is oriented and arranged, while the other two directions of crystal grains are in a state of random arrangement, The problem of being unable to prepare single-crystal polycrystalline WC alloys with excellent anisotropy provides a three-dimensional oriented preparation method for WC alloys

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  • Three-dimensional orientation preparation method of wc alloy
  • Three-dimensional orientation preparation method of wc alloy
  • Three-dimensional orientation preparation method of wc alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Alloy preparation of three-dimensional texture

[0043] (1) Using the molten salt method to prepare plate-like tungsten carbide single crystal particles as seeds: the WO 3 (>99.95%) and C (>99.99%) are compounded according to the mass ratio of 1:1.

[0044] (2) After the mixed powder is obtained, NaCl salt is added according to the weight ratio of salt to material 1:1, and ball milling is carried out with ethanol as the medium, and the volume ratio of ethanol and powder is 2:1. After ball milling, dry and sieve.

[0045] (3) The homogeneously mixed raw materials were calcined at 1200° C. for 2 hours in an argon atmosphere.

[0046] (4) Rinse the roasted product with deionized water for several times until the residual molten salt particles are completely removed (determined by titration method that the molten salt is completely removed), and after drying at 50°C for 24 hours, a plate-shaped WC single crystal is obtained particles.

[0047] (5) Mix the obta...

Embodiment 2

[0055] Example 2 Alloy preparation of three-dimensional texture

[0056] (1) Using the molten salt method to prepare plate-like tungsten carbide single crystal particles as seeds: the WO 3 (>99.95%) and C (>99.99%) are compounded according to the mass ratio of 1:1.

[0057] (2) After obtaining the mixed powder, add KCl salt according to the weight ratio of salt to material 1:2, and conduct ball milling with ethanol as the medium, and the volume ratio of ethanol and powder is 2:1. The grinding ball is ZrO 2 Ceramic material, ball milling speed is 450r / m (round per minute), ball milling time is 4h, after ball milling, dry and sieve.

[0058] (3) The homogeneously mixed raw materials in step 2 were calcined at 1300° C. for 1.5 hours in an argon atmosphere.

[0059] (4) Rinse the roasted product with distilled water for several times until the residual molten salt particles are completely removed (determined by titration method that the molten salt is completely removed), and a...

Embodiment 3

[0067] Example 3 Alloy preparation of three-dimensional texture

[0068] (1) Using the molten salt method to prepare plate-like tungsten carbide single crystal particles as seeds: the WO 3 (>99.95%) and C (>99.99%) are compounded according to the mass ratio of 1:1.

[0069] (2) After obtaining the mixed powder, add NaCl salt according to the weight ratio of salt material (that is, the mass ratio of chloride salt to mixed powder) 1:1.5, and conduct ball milling with ethanol as the medium. After ball milling, dry and sieve.

[0070] (3) The homogeneously mixed raw materials were calcined at 1350° C. for 3 hours in an argon atmosphere.

[0071] (4) Rinse the roasted product with distilled water for several times until the residual molten salt particles are completely removed (determined by titration method that the molten salt is completely removed), and after drying, plate-shaped WC single crystal particles are obtained.

[0072] (5) Mix the obtained plate-shaped WC powder an...

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Abstract

The invention discloses a three-dimensional orientation preparation method of WC alloy. A problem that monocrystalline polycrystalline WC alloy with excellent anisotropy cannot be prepared due to the oriented arrangement in one direction and random arrangement of crystal grains in other two directions of the crystal grains of WC alloy prepared through a current template crystal grain growth method is solved. The preparation method comprises the following steps: sequentially preparing sheet tungsten carbide single crystal particles and a suspension, and using a vacuum negative pressure to discharge a gas in the suspension; orienting crystal grains in x-direction through magnetic field orientation, and orienting crystal grains in z-direction through the template crystal grain growth method; allowing fixation normalization to naturally occur after the satisfactory crystal grain orientation in the x-direction and the z-direction in order to realize a three-dimensional texture; and carrying out sintering densification on the obtained preform in order to obtain the three-dimensional orientated WC alloy. The method has the advantages of successful realization of 3D texture of WC, simple process flow, convenient operation and wide market application prospect.

Description

technical field [0001] The invention relates to the field of materials, in particular to the field of cemented carbide, in particular to a three-dimensional directional preparation method for WC alloys. Background technique [0002] Cemented carbide has excellent properties such as high elastic modulus, high hardness, and high thermal stability, so it has a wide range of applications in the field of production technology. [0003] Among them, the textured WC cemented carbide has unique properties such as high toughness and high strength. The reason why WC cemented carbide with plate-like tungsten carbide grains has high hardness is related to the anisotropy of its grains. The structure of WC belongs to the hexagonal crystal system, which has anisotropy, especially the strong anisotropy of hardness, which leads to great differences in the physical and mechanical properties of different orientations and crystal planes. The hardness of its (001) direction is much higher than ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B28/02C30B29/36C30B9/12
Inventor 高志鹏谢庆海刘雨生刘高旻张福平贺红亮
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS