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A kind of cobalt-free gradient WC cemented carbide high-pressure block and its preparation method

A cemented carbide and square technology, applied in the field of alloy materials, can solve the problems of deterioration of high temperature resistance, oxidation resistance, short life, poor wettability, etc., and achieve the effect of reducing cost and excellent performance

Active Publication Date: 2020-04-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, WC-Fe is prone to carbon deficiency, and the wettability of iron to WC is poor, resulting in significantly lower strength and toughness; compared with WC-Fe, WC-Ni has relatively better strength and toughness, but still significantly lower For YG alloys
More importantly, using metal as the binder phase will seriously deteriorate the performance of high temperature resistance and oxidation resistance, so that the service life is shorter when used as a high-pressure block

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of Ni by mechanical alloying 3 Al powder: Raw material powder ingredients according to the following mass percentages: Ni 70.10%, Al 10.00%, Cr 7.90%, Fe 10.70%, Zr 1.00%, B 0.30%, and the rest are unavoidable trace impurities, of which Ni, Al, Cr , Fe, Zr powder purity ≥ 99.9%, particle size 1 ~ 3μm, B powder purity ≥ 99.0%, which is amorphous high-purity boron powder; put the above raw material powder in a planetary ball mill for high-energy ball milling, and the ball milling material is WC hard high-quality alloy, the ball-to-material ratio is 10:1, the rotation speed is 266r / min, and high-purity Ar gas is used as the protective atmosphere, and the Ni particles with a particle size of ≤250μm are obtained by ball milling for 30 hours. 3 Al intermetallic compound powder;

[0035] (2) the above Ni 3 15wt.% of Al intermetallic compound powder, 85wt.% of WC powder (WC powder purity ≥ 99.9%, particle size 2-8 μm) and 2.2% paraffin of the above-mentioned a...

Embodiment 2

[0040] (1) Preparation of Ni by mechanical alloying 3 Al powder: Raw material powder ingredients according to the following mass percentages: Ni 68.90%, Al 11.00%, Cr 8.30%, Fe 10.40%, Zr 1.00%, B 0.40%, and the rest are unavoidable trace impurities, of which Ni, Al, Cr , Fe, Zr powder purity ≥ 99.9%, particle size 1 ~ 3μm, B powder purity ≥ 99.0%, which is amorphous high-purity boron powder; put the above raw material powder in a planetary ball mill for high-energy ball milling, and the ball milling material is WC hard high-quality alloy, the ball-to-material ratio is 10:1, the rotation speed is 266r / min, and high-purity Ar gas is used as the protective atmosphere, and the Ni particles with a particle size of ≤250μm are obtained by ball milling for 30 hours. 3 Al intermetallic compound powder;

[0041] Steps (2)-(4) are the same as in Example 1.

[0042] Prepared by the above method, the obtained cemented carbide high pressure block has the required alloy gradient structure...

Embodiment 3

[0044] Step (1) and (2) are with embodiment 1;

[0045] (3) the high Ni obtained in step (2) 3 Al content mixed powder for pre-press molding to get 40×40×40mm 3 core block, and then use cold isostatic pressing 500MPa to hold the pressure for 15min; then coat the core block with a layer of low Ni 3 Al content mixed powder, and then pre-pressed to obtain 60 × 60 × 60mm 3 The overall block, and then use the cold isostatic pressure of 500MPa to hold the pressure for 15 minutes to obtain the final pre-pressed block;

[0046] Step (4) is the same as in Example 1.

[0047] Prepared by the above method, the obtained cemented carbide high pressure block has the required alloy gradient structure, and the core part is WC-Ni 3 The transverse fracture strength and fracture toughness of Al materials are 2100MPa and 16.0MPa m respectively 1 / 2 ;Surface WC-Ni 3 Al material hardness, transverse fracture strength and fracture toughness are 96HRA, 1550MPa, 9.0MPa m respectively 1 / 2 . At 8...

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Abstract

The invention belongs to the technical field of alloy materials, and discloses a cobalt-free gradient WC hard alloy high-pressure block and a preparing method thereof. By mass percent, 68.9 to 70.2% of Ni, 10 to 11% of Al, 10.4 to 10.9% of Fe, 7.9 to 8.3% of Cr, 0.8 to 1% of Zr and 0.2 to 0.4% of B are subject to ball milling, Ni3Al intermetallic compound powder is made, the intermetallic compoundpowder, WC powder and forming agent paraffin are subject to wet type ball milling, and mixed powder high in Ni3Al and mixed powder low in Ni3Al are obtained; the mixed powder high in Ni3Al is used for preparing a core block, the core block is wrapped by the mixed powder low in Ni3Al, after pre-pressing forming, vacuum sintering is carried out, and the cobalt-free gradient WC hard alloy high-pressure block is obtained. Through component and gradient structural design, the material has the outer high hardness and core high toughness, and defects of homogeneous materials are overcome.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a cobalt-free gradient WC hard alloy high-pressure block and a preparation method thereof. Background technique [0002] Cemented carbide high pressure block is the core component of ultra-high pressure synthesis equipment for producing superhard materials. With the continuous enrichment of the types of synthetic superhard materials and the continuous increase in size, the high-pressure cube has also increased from the initial single 3kg to 50kg, and more stringent requirements have been put forward for its high temperature resistance, hardness, toughness, and oxidation resistance. It is increasingly difficult for the current homogeneous YG materials to meet the application requirements, and it is urgent to develop new WC materials with better comprehensive properties. [0003] The current high-pressure blocks at home and abroad all use YG8-YG20 homogeneous W...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10
CPCC22C1/051C22C29/005C22C29/067C22C29/08
Inventor 李小强张民爱刘波邱昊屈盛官杨超梁良
Owner SOUTH CHINA UNIV OF TECH