Preparation method for in-situ generation of (Ti, W) C reinforced WC-Ni3Al composite material by adding Ti powder

An in-situ generation, composite material technology, applied in the field of alloy materials, can solve the problems of easy softening, restricting the application of WC-Co cemented carbide, and WC-based cemented carbide, etc., and achieve the improvement of hardness and fracture toughness. Antioxidative properties, effects of excellent antioxidative properties

Active Publication Date: 2022-03-22
SOUTH CHINA UNIV OF TECH
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  • Abstract
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Problems solved by technology

The WC-Co cemented carbide is mainly composed of the hard phase WC and the binder phase Co. The wettability of Co to WC is excellent. The addition of Co helps to obtain a high-density WC-based cemented carbide, but the addition of Co cannot Avoiding the decrease of the hardness, oxidation resistance and corrosion resistance of WC-based cemented carbide, and Co is easy to so

Method used

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  • Preparation method for in-situ generation of (Ti, W) C reinforced WC-Ni3Al composite material by adding Ti powder
  • Preparation method for in-situ generation of (Ti, W) C reinforced WC-Ni3Al composite material by adding Ti powder
  • Preparation method for in-situ generation of (Ti, W) C reinforced WC-Ni3Al composite material by adding Ti powder

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Experimental program
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Effect test

Embodiment 1

[0035] (1) Preparation of Ni by mechanical alloying 3 Al powder: Raw material powder ingredients according to the following mass percentage: Ni80%, Al10.70%, Cr7.85%, Mo 1.44%, B 0.01%, wherein Ni, Al, Cr, Mo powder purity ≥ 99.9%, particle size 1~ 3μm, B powder purity ≥ 99.1%, is amorphous high-purity boron powder; put the above raw material powder in a planetary ball mill for high-energy ball milling, the ball milling material is WC carbide, the ball-to-material ratio is 10:1, and the speed is 226r / min, and using high-purity Ar gas as a protective atmosphere, ball milling for 30 hours to produce Ni with a particle size of ≤250μm 3 Al intermetallic compound powder;

[0036] (2) Ni 3 Pour 10wt.% of Al intermetallic compound powder and 90wt.% of WC powder (0.8μm, purity ≥99.9%, Jinlu Special Alloy Co., Ltd.) into a 250ml hard alloy tank, and then add cyclohexane as a solvent to obtain a mixed slurry ;Place the ball mill tank with the mixed slurry in a planetary ball mill for...

Embodiment 2

[0040] Step (1) is with embodiment 1;

[0041] (2) Ni 3Al intermetallic compound powder 10wt.%, Ti powder (10μm, purity ≥99.9%, Zhongnuo New Material (Beijing) Technology Co., Ltd.) 2wt.% and WC powder (0.8μm, purity ≥99.9%, Jinlu Special Alloy Co., Ltd. 88wt.% of the company) is poured into a 250ml cemented carbide tank, and cyclohexane is added as a solvent to obtain a mixed slurry; The material is WC-Co cemented carbide, the ratio of ball to material is 5:1, and the mixed slurry is prepared by ball milling for 24 hours at a speed of 180r / min, and then the above mixed slurry is dried in a drying furnace until the solvent Residue ≤ 1%, crushed and sieved to obtain mixed powder with particle size ≤ 250 μm;

[0042] (3) Weigh 28g of the mixed powder obtained in step (2) and put it into a graphite sintering mold with a diameter of φ20mm for one-step discharge plasma sintering. The sintering current type is DC pulse current, wherein the sintering pressure is 30MPa, and the sint...

Embodiment 3

[0045] Step (1) is with embodiment 1;

[0046] (2) Ni 3 Al intermetallic compound powder 10wt.%, Ti powder (10μm, purity ≥99.9%, Zhongnuo New Material (Beijing) Technology Co., Ltd.) 3wt.% and WC powder (0.8μm, purity ≥99.9%, Jinlu Special Alloy Co., Ltd. Company) 87wt.% is poured in the 250ml cemented carbide jar, then adds cyclohexane to obtain mixed slurry as solvent; The ball mill jar that mixed slurry is housed is placed in planetary ball mill and carries out low-energy ball milling, ball mill jar and ball mill The material is WC-Co cemented carbide, the ratio of ball to material is 5:1, and the mixed slurry is prepared by ball milling for 24 hours at a speed of 180r / min, and then the above mixed slurry is dried in a drying furnace until the solvent Residue ≤ 1%, crushed and sieved to obtain mixed powder with particle size ≤ 250 μm;

[0047] (3) Weigh 28g of the mixed powder obtained in step (2) and put it into a graphite sintering mold with a diameter of φ20mm for one-...

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Abstract

The invention discloses a preparation method for in-situ generation of a (Ti, W) C reinforced WC-Ni3Al composite material by adding Ti powder. The method comprises the following preparation steps: preparing Ni3Al powder by mechanical alloying, wherein the Ni3Al powder comprises Ni, Al, Cr, Mo and B; the raw material powder is placed in a ball mill for dry ball milling, and Ni3Al intermetallic compound powder is prepared; ni3Al intermetallic compound powder, titanium powder and WC powder are placed in an organic solvent to be subjected to wet ball milling, mixed slurry is prepared, then the mixed slurry is dried, pulverized and sieved, and mixed powder is obtained; and sintering to obtain the product. On the premise that titanium powder is added, (Ti, W) C is generated in a WC matrix by adopting an in-situ generation method, the added Ti powder firstly consumes part of O elements in the sintering process to form an oxide of Ti, then TiC is formed at high temperature, and then the TiC and WC form a (Ti, W) C solid solution.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, in particular to a kind of in-situ generation of (Ti, W) C reinforced WC-Ni by adding Ti powder 3 Preparation method of Al composites. Background technique [0002] Tungsten carbide-cobalt (WC-Co) cemented carbide has high hardness, high wear resistance and excellent fracture toughness, so it is widely used in mining, oil drilling, metal cutting and other fields that are closely integrated with the development of the national economy. Currently the most widely used cemented carbide. The WC-Co cemented carbide is mainly composed of the hard phase WC and the binder phase Co. The wettability of Co to WC is excellent. The addition of Co helps to obtain a high-density WC-based cemented carbide, but the addition of Co cannot Avoiding the decrease of the hardness, oxidation resistance and corrosion resistance of WC-based cemented carbide, and Co is easy to soften at high temperature, these def...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F3/105C22C1/05C22C29/08
CPCC22C1/058B22F9/04B22F3/105C22C29/08C22C29/067B22F2009/043B22F2009/041B22F2003/1051
Inventor 李小强吴祖骥李京懋徐港来朱德智屈盛官
Owner SOUTH CHINA UNIV OF TECH
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