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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: 2011-05-18
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
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Effect test

Embodiment 1

[0020] Use W powder with an average particle size of 46.4nm, graphite powder with an average particle size of 106.8nm, Co powder with an average particle size of 255.0nm, and Cr with a Fisher 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 Carbide. The alloy mixture was prepared by the traditional wet grinding process, the wet grinding time was 30h, and the ball-to-material ratio was 5:1. During the wet grinding process, paraffin wax accounting for 1.2% of the mixture mass fraction and PEG4000 accounting for 1.2% of the mixture mass fraction were added, A mixed solution of alcohol and n-hexane with a volume ratio of 1:1 was used as the wet grinding medium. The alloy samples were pressed by the traditional molding process, and the alloy samples were sintered by the traditional vacuum sintering process at 1380°C for 1 hour. The...

Embodiment 2

[0022] Using W powder with an average particle size of 46.4nm, graphite powder with an average particle size of 106.8nm, Ni powder with an average particle size of 205.0nm, and Cr with a Fisher particle size of 1.45μm in the supply state (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 Carbide. The alloy mixture was prepared by the traditional wet grinding process, the wet grinding time was 32h, and the ball-to-material ratio was 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 were added. A mixed solution of alcohol and n-hexane with a volume ratio of 1:1 was used as the wet grinding medium. The alloy samples were pressed by the traditional molding process, and the alloy samples were sintered by the pressure sintering process. The sintering temperature was 1370 ° C, the holdi...

Embodiment 3

[0024] Adopt the W powder of specific surface area average particle size 46.4nm, the graphite powder of specific surface area average particle size 106.8nm, the Co powder of specific surface area average particle size 255.0nm, the Ni powder of specific surface area average particle size 205.0nm, supply state (40h before wet grinding pretreatment ) Cr with a Fischer particle size of 1.45 μm 3 C 2 And anhydrous cerium chloride as raw material to prepare WC-3Ni-7Co-0.75Cr 3 C 2 -0.05CeO 2 Carbide. The alloy mixture was prepared by the traditional wet grinding process, the wet grinding time was 34h, the ball-to-material ratio was 4:1, 1.8% paraffin wax and 0.8% PEG4000 were added during the wet grinding process, A mixed solution of alcohol and n-hexane with a volume ratio of 1:1 was used as the wet grinding medium. The alloy samples were pressed by the traditional molding process, and the alloy samples were sintered by the pressure sintering process. The sintering temperature...

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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 alloy with 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 high-hardness and high-toughness double high-performance WC-based hard alloy, which belongs to the field of powder metallurgy materials. Background technique [0002] Plate grain cemented carbide refers to a cemented carbide in which the ratio of the volume of WC grains with plate grain characteristics to the total volume of WC grains in the alloy (abbreviated as plate grain WC volume fraction) exceeds 20%. In Japan, plate grain cemented carbide is also called plate crystal cemented carbide or plate crystal cemented carbide. Plate grain cemented carbide is divided into plate grain cemented carbide and plate grain WC volume fraction of more than 80% pure plate grain cemented carbide. The hardness and toughness of traditional cemented carbide are a pair of contradictory parameters, and the hardness should be increased at the expense of toughness, and vice versa. figure 1 and figure 2 They are the thr...

Claims

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Application Information

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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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