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Preparation method of hard alloy with double crystal structure

A technology of cemented carbide and double crystal structure, which is applied in the field of cemented carbide materials, can solve the problems of limited application range and inability to meet the comprehensive performance of products, and achieve the effects of improving hardness, good impact toughness and good wear resistance

Inactive Publication Date: 2012-05-02
CHENGDU BANGPU CUTTING TOOLS CO LTD
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Problems solved by technology

Pure fine-grained or coarse-grained alloys often cannot meet the comprehensive performance of the product, and the scope of use is limited

Method used

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  • Preparation method of hard alloy with double crystal structure
  • Preparation method of hard alloy with double crystal structure

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Embodiment Construction

[0012] refer to figure 1 , the specific embodiment adopts the following technical scheme: its formula consists of: coarse particle tungsten carbide (WC), fine particle tungsten carbide; its preparation method is: 1, coarse particle and fine particle tungsten carbide are mixed according to 3:7~ 7:3 ratio is added in the mixture; 2, pre-ball milling: the weight percentage is 9~11% cobalt powder and weight percentage is 4.56% titanium element and fine particle tungsten carbide are packed in ball mill, add the weight percentage prepared in advance to be 2-2.5% paraffin wax powder and 0.5-1.5ml oleic acid per kilogram of mixture as dispersant, 300-380ml of alcohol per kilogram of mixture as mixture medium; alloy balls for grinding are loaded 3-4 times as much as the mixture In the ball mill; titanium element is added in the form of WC (TiC) solid solution; pre-milling for 20-30 hours; 3. Secondary charging ball milling: put coarse tungsten carbide powder and cobalt powder into the ...

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Abstract

Relating to the technical field of hard alloy materials, the invention provides a preparation method of a hard alloy with a double crystal structure. The preparation method comprises: 1. adding coarse grains and fine grains of tungsten carbide into a mixture; 2. conducting pre-ball milling: putting cobalt powder, titanium element and fine grains of tungsten carbide into a ball mill, adding dispersants, and taking alcohol as the mixture medium; putting alloy balls used for grinding into the ball mill; adding the element of titanium in the form of a solid solution; 3. carrying out second charging ball milling; 4. subjecting the uniformly mixed mixture to drying, granulation, and compression moulding by an alloy blade; 5. sintering the compressed compact in a pressure sintering furnace, and adding pressure for sintering, thus obtaining a tissue structure with uniformly distributed tungsten carbide crystal grains. The preparation method of the invention can improve the fracture toughness of the alloy and can endow the prepared hard alloy with a service life longer than traditional materials by 0.5-1 time.

Description

Technical field: [0001] The invention relates to the technical field of cemented carbide materials, in particular to a method for preparing cemented carbide with a twin crystal structure. Background technique: [0002] Cemented carbide materials are used in processing tools in the manufacturing industry. They have high hardness, good high temperature performance and excellent wear resistance, and are known as industrial teeth. As an alloy for metal cutting, grades for various materials are derived with the change of composition. [0003] The existing technology mainly mixes the average tungsten carbide particle size with the binder phase cobalt element, titanium carbide and other additive elements, ball mills, adds molding agents (such as paraffin wax, butadiene rubber, etc.), drying, granulating, and molding , Vacuum sintering. For example: YT5 brand alloy uses tungsten carbide with an average particle size of 4-8um, 9-11% cobalt by weight and 4.5-6% titanium by weight. A...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/04
Inventor 郎洪彬
Owner CHENGDU BANGPU CUTTING TOOLS CO LTD
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