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Method for preparing WC base hard alloy with high hardness and high toughness

A cemented carbide and high toughness technology, applied in the field of powder metallurgy materials, can solve problems that do not involve plate crystal WC grain crystallization

Active Publication Date: 2012-02-22
GUANGDONG XIANGLU TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The various preparation methods of plate grain cemented carbide that have been reported so far do not involve the control method of plate grain WC grain crystallization integrity and the preparation method of pure plate grain structure cemented carbide.

Method used

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  • Method for preparing WC base hard alloy with high hardness and high toughness
  • Method for preparing WC base hard alloy with high hardness and high toughness
  • Method for preparing WC base hard alloy with high hardness and high toughness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Use W powder with a specific surface area average particle size of 46.4nm, graphite powder with a specific surface area average particle size of 106.8nm, Co powder with a specific surface area average particle size of 255.0nm, and Cr with a Fischer particle size of 1.45μm in the supply state (before 40h wet grinding pretreatment) 3 C 2 And anhydrous lanthanum nitrate as raw materials to prepare WC-10Co and WC-10Co-0.6Cr 3 C 2 -0.06La 2 O 3 Cemented carbide. The alloy mixture is prepared by the traditional wet grinding process, the wet grinding time is 30h, the ball-to-battery ratio is 5:1, and the paraffin wax accounting for 1.2% of the mixture mass fraction and PEG4000 accounting for 1.2% of the mixture mass fraction are added during the wet grinding process. A mixed solution of alcohol and n-hexane with a volume ratio of 1:1 is used as the wet grinding medium. The alloy sample is pressed by the traditional molding process, and the alloy sample is sintered by the traditi...

Embodiment 2

[0022] Use W powder with a specific surface area average particle size of 46.4nm, graphite powder with a specific surface area average particle size of 106.8nm, Ni powder with a specific surface area average particle size of 205.0nm, and Cr with a Fischer particle size of 1.45μm in supply (before 40h wet grinding pretreatment) 3 C 2 And anhydrous yttrium nitrate as raw material to prepare WC-10Ni-0.8Cr 3 C 2 -0.04Y 2 O 3 Cemented carbide. The alloy mixture is prepared by the traditional wet grinding process. The wet grinding time is 32h and the ball-to-battery ratio is 4:1. During the wet grinding process, paraffin wax accounting for 1.8% of the mixture mass fraction and PEG4000 accounting for 0.8% of the mixture mass fraction are added. A mixed solution of alcohol and n-hexane with a volume ratio of 1:1 is used as the wet grinding medium. The alloy sample is pressed by the traditional molding process, and the alloy sample is sintered by the pressure sintering process. The sinte...

Embodiment 3

[0024] W powder with a specific surface area average particle size of 46.4nm, graphite powder with a specific surface area average particle size of 106.8nm, Co powder with a specific surface area average particle size of 255.0nm, and Ni powder with a specific surface area average particle size of 205.0nm, supplied (before 40h wet grinding pretreatment )Cr with a Fischer grain size of 1.45μm 3 C 2 And anhydrous cerium chloride as raw materials to prepare WC-3Ni-7Co-0.75Cr 3 C 2 -0.05CeO 2 Cemented carbide. The alloy mixture is prepared by the traditional wet grinding process, the wet grinding time is 34h, and the ball-to-battery ratio is 4:1. During the wet grinding process, paraffin wax accounting for 1.8% of the mixture mass fraction and PEG4000 accounting for 0.8% of the mixture mass fraction are added. A mixed solution of alcohol and n-hexane with a volume ratio of 1:1 is used as the wet grinding medium. The alloy sample is pressed by the traditional molding process, and the...

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Abstract

The invention discloses a method for preparing a WC base hard alloy with high hardness and high toughness. Nano W powder, nano graphite powder and superfine Co powder or superfine Ni powder or superfine Co powder and superfine Ni powder with the specific surface area average granularity of smaller than 0.5 micron are used as raw materials; superfine Cr3C2 and rare earth are used as combined doping agents; the addition amount of the superfine Cr3C2 is controlled to account for 6-8 percent by mass of alloy binding agent; the addition amount of rare earth is controlled to account for 0.3-0.7 percent by mass of alloy binding agent in the terms of oxide; W-Co-C or W-Ni-C or a W-Co-Ni-C mixed material which is combined and doped by superfine Cr3C2 and rare earth is prepared by adopting a wet grinding process; an alloy press blank is prepared by adopting a die forming or hydrostaticisostatic forming process according to the product size and appearance characteristics; alloy is sintered by adopting a vacuum-sintering process or a pressure sintering process; and the alloy sintering temperature is controlled between 1,360 DEG C and 1,420 DEG C. According to the invention, WC base hard alloywith high crystalline perfection, pure plate-shaped crystal structure and isotropy can be prepared and the double-high performance characteristics of the alloy are realized.

Description

Technical field [0001] The invention relates to a preparation method of a WC-based cemented carbide with high hardness, high toughness and double high performance, belonging to the field of powder metallurgy materials. Background technique [0002] Tabular crystalline cemented carbide refers to a cemented carbide in which the ratio of the volume of WC grains with tabular crystalline characteristics to the total volume of WC grains in the alloy (referred to as tabular WC volume fraction) exceeds 20%. In Japan, plate crystal cemented carbide is also called lamella cemented carbide or disc crystal cemented carbide. Tabular crystalline cemented carbide is classified into platy crystalline cemented carbide and pure tabular crystalline cemented carbide with a WC volume fraction of more than 80%. The hardness and toughness of traditional cemented carbide are a pair of contradictory parameters. The increase in hardness must be done at the expense of toughness, and vice versa. figure 1 w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/08
Inventor 张立吴厚平陈述熊湘君
Owner GUANGDONG XIANGLU TUNGSTEN
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