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Fine pure plate-shaped grain cemented carbide and preparation method thereof

A hard alloy and pure plate technology, which is applied in the field of preparation of the fine and pure plate crystal hard alloy, can solve the problem of low fracture toughness

Active Publication Date: 2015-05-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest shortcoming of ultra-fine grained cemented carbide is low fracture toughness, Palmqvist fracture toughness K 1c Usually 1 / 2
None of the reported preparation methods of pure plate-shaped cemented carbide involve the regulation of the plate-shaped WC grain size. At present, there is no fine pure plate-shaped cemented carbide with high strength, high hardness, and high toughness. Report on Crystalline Carbide

Method used

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  • Fine pure plate-shaped grain cemented carbide and preparation method thereof
  • Fine pure plate-shaped grain cemented carbide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Using WC–12Co nanocomposite powder with a WC grain size of 90nm, Cr 3 C 2 , VC and anhydrous lanthanum nitrate as raw materials to prepare WC–12Co–0.96Cr 3 C2 –0.36VC–0.072La 2 o 3 Carbide. The alloy mixture was prepared by rolling wet grinding process, the wet grinding time was 40h, and the ball-to-material ratio was 5:1. During the wet grinding process, paraffin wax accounting for 1.5% of the total mass fraction of the alloy mixture and 1.5% of the total mass fraction of the alloy mixture were added. % PEG4000, using a mixed solution of alcohol and n-hexane with a volume ratio of 1:1 as the wet grinding medium. The alloy samples were pressed by the traditional molding process, and the alloy samples were sintered in a 6MPa pressure sintering furnace. The sintering temperature was 1380°C, the holding time was 1h, and the pressure in the furnace during the holding stage was 5.6MPa. figure 1 It is a 3D high-resolution scanning electron microscope photo of the surface...

Embodiment 2

[0022] Using WC–12Co nanocomposite powder with a WC grain size of 90nm, Cr 3 C 2 , VC and anhydrous yttrium nitrate as raw materials to prepare WC–12Co–0.6Cr 3 C 2 –0.48VC–0.036Y 2 o 3 Carbide. The alloy mixture was prepared by rolling wet grinding process, the wet grinding time was 60h, and the ball-to-material ratio was 6:1. During the wet grinding process, paraffin wax accounting for 1.0% of the total mass fraction of the alloy mixture and 1.0% of the total mass fraction of the alloy mixture were added. % PEG4000, using a mixed solution of alcohol and n-hexane with a volume ratio of 1:1 as the wet grinding medium. The alloy samples were pressed by the traditional molding process, and the alloy samples were sintered in a 10MPa pressure sintering furnace. The sintering temperature was 1360°C, the holding time was 1h, and the pressure in the furnace during the holding stage was 9.5MPa. The 3D microstructure measurement results on the surface of the alloy sintered body sh...

Embodiment 3

[0024] Using WC–12Co–0.72Cr with a WC grain size of 80nm 3 C 2 –0.36VC–0.054CeO 2 Nanocomposite powder as raw material to prepare WC–12Co–0.72Cr 3 C 2 –0.36VC–0.054CeO 2 Carbide. The alloy mixture was prepared by rolling wet grinding process, the wet grinding time was 50h, and the ball-to-material ratio was 4:1. During the wet grinding process, paraffin wax accounting for 1.2% of the total mass fraction of the alloy mixture and 1.2% of the total mass fraction of the alloy mixture were added. % PEG4000, using a mixed solution of alcohol and n-hexane with a volume ratio of 1:1 as the wet grinding medium. The alloy samples were pressed by the traditional molding process, and the alloy samples were sintered in a 6MPa pressure sintering furnace. The sintering temperature was 1400°C, the holding time was 1h, and the pressure in the furnace during the holding stage was 5.6MPa. The 3D microstructure measurement results on the surface of the alloy sintered body show that the aver...

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Abstract

The invention discloses a fine pure plate-shaped grain cemented carbide and a preparation method thereof, wherein the microstructure of the carbide is composed of a fine pure plate-shaped crystalline WC hard phase and an alloy bonding phase which is uniformly distributed; in the alloy, the regular triangle average side length of a regular triangular prism-shaped WC plate-shaped grain is shorter than 0.8microns, and the average height of the prism is lower than 0.25microns; WC-Co nano composite powder with WC grain size lower than 100nm is taken as a raw material; the alloy contains a Cr+V+rare earth trinary grain growth regulating agent, the additive amounts of the Cr, V and rare earth respectively account 5-8wt%, 3-4wt% and 0.3-0.6wt% of Co in the alloy; the additive amounts of the Cr and V are measured in terms of Cr3C2 and VC, and the additive amount of the rare earth is measured in terms of oxide; a rolling wet-grinding process is adopted to prepare an alloy mixing material, and the wet-grinding duration is 40-60hours and ball-to-power mass ratio is at (4:1)-(6:1); and a pressure sintering process is adopted to sinter the alloy, and the sintering temperature is at 1360-1400 DEG C.

Description

technical field [0001] The invention relates to a fine and pure plate crystal hard alloy, and also relates to a preparation method of the fine pure plate crystal hard alloy. Background technique [0002] Plate grain cemented carbide refers to the cemented carbide in which the ratio of the volume of WC grains with plate grain characteristics in the alloy to the total volume of WC grains in the alloy (abbreviated as the volume fraction of plate grain WC) is greater than 20%. In Japan, plate grain cemented carbide is also called plate crystal cemented carbide or plate crystal cemented carbide. Plate crystal cemented carbide is divided into plate crystal cemented carbide and plate crystal WC volume fraction > 80% pure plate crystal 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. Pure plate crystal cemented carbide has the cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/08
Inventor 张立陈述吴厚平熊湘君
Owner CENT SOUTH UNIV
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