Hard alloy with gradient cobalt content and preparation method thereof

A gradient distribution, cemented carbide technology, applied in the field of cemented carbide production, can solve problems such as cracking and mold damage, and achieve the effect of excellent strength and toughness

Active Publication Date: 2019-02-12
株洲金韦硬质合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, cemented carbide products such as blades, drill teeth, rock cutting tools, molds, etc. require high hardness and wear resistance on the surface during use, but in order to make it withstand greater impact and prevent cracks on the surface Inward diffusion also requires strong toughness in the alloy body; and during use of products with consistent metallographic and mechanical properties, once cracks occur on the surface, the cracks will quickly expand and cause damage and rupture of the entire tool and mold. and scrapped

Method used

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  • Hard alloy with gradient cobalt content and preparation method thereof
  • Hard alloy with gradient cobalt content and preparation method thereof
  • Hard alloy with gradient cobalt content and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a method for preparing cemented carbide with a gradient distribution of cobalt content, comprising the following steps:

[0048] S1. Ingredients:

[0049] S11. Preparation of mixture A: It consists of the following alloy components in weight percentage: 94% tungsten carbide, 6% Co powder; mix according to the above weight percentage, add refined paraffin, and mix well to obtain mixture A; wherein, the particle size of tungsten carbide 1.2um, the amount of refined paraffin added is 2.5% of the total cemented carbide;

[0050] S12. Prepare mixture B: it consists of the following alloy components in weight percentage: 90% tungsten carbide, 10% Co powder; mix according to the above weight percentage, add refined paraffin, and mix well to obtain mixture A; wherein, the particle size of tungsten carbide 2.4um, the amount of refined paraffin added is 2.5% of the total cemented carbide;

[0051] S2. Ball milling, spray drying and granulation:

[0052...

Embodiment 2

[0067] This embodiment provides a method for preparing cemented carbide with a gradient distribution of cobalt content. Referring to the operation steps of Embodiment 1, the main difference is that in step S11, the mixture A is composed of the following alloy components in weight percentage: tungsten carbide 98% , Co powder 2%, the addition of refined paraffin wax is 2.0% of the total amount of cemented carbide, and the particle size of tungsten carbide is 1.5um; in step S12, the mixture B is composed of the following alloy components in weight percentage: tungsten carbide 93%, Co powder is 7%, the amount of refined paraffin added is 2.0% of the total cemented carbide, and the particle size of tungsten carbide is 2.2um.

Embodiment 3

[0069] This embodiment provides a method for preparing cemented carbide with a gradient distribution of cobalt content. Referring to the operation steps of Embodiment 1, the main difference is that in step S11, the mixture A is composed of the following alloy components in weight percentage: tungsten carbide 96% , Co powder 4%, the addition of refined paraffin wax is 2.2% of the total amount of cemented carbide, and the particle size of tungsten carbide is 1.6um; in step S12, the mixture B is composed of the following alloy components in weight percentage: tungsten carbide 92%, Co powder is 8%, the amount of refined paraffin added is 2.2% of the total cemented carbide, and the particle size of tungsten carbide is 2.0um.

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Abstract

The invention belong to the technical field of hard alloy production and discloses a hard alloy with gradient cobalt content and a preparation method of the hard alloy. The method comprises the following steps of performing ball milling and spray drying respectively on a mixture A and a mixture B for granulation, and then simultaneously performing press molding and sintering treatment on the mixture A and the mixture B to obtain the hard alloy with gradient cobalt content. The problems that a product cannot keep good hardness, wear resistance or toughness at the same time can be effectively solved by the hard alloy with gradient cobalt content and the preparation method of the hard alloy by means of adjusting the composition and proportion of raw materials, changing the traditional pressing forming mode, formulating a corresponding production process and using hard alloy combination raw materials with different particle sizes and cobalt content.

Description

technical field [0001] The invention belongs to the technical field of hard alloy production, and more specifically relates to a hard alloy with a gradient distribution of cobalt content and a preparation method thereof. Background technique [0002] Cemented carbide is composed of refractory metal hard compound and bonding metal (mainly cobalt). The processing flow of cemented carbide used now is: mixing (tungsten carbide and cobalt)-ball milling-spray (binder)-forming- Debinding-sintering-finished product, the particle size and cobalt content of cemented carbide manufactured by this process are uniform. This kind of cemented carbide products with uniform structure has a contradiction between high hardness and wear resistance and toughness that is difficult to reconcile, that is, when the content of cobalt (Co) in the alloy is reduced to improve its hardness and wear resistance, the alloy body The toughness will decrease accordingly; otherwise, it will affect its hardness ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10B22F9/04B22F9/08B22F3/02B22F3/16
CPCB22F3/02B22F3/16B22F9/04B22F9/08B22F2009/043C22C1/051C22C29/067C22C29/08
Inventor 朱质斌
Owner 株洲金韦硬质合金有限公司
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