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A kind of fine-grained cemented carbide and its preparation method

A cemented carbide and fine-grained technology, which is applied in the preparation of fine-grained cemented carbide and the field of cemented carbide materials, to achieve the effects of easy amplification, low cost and simple synthesis

Active Publication Date: 2020-11-27
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, this kind of nanomaterials also has attractive application prospects in the field of cemented carbide, especially various high-melting-point carbides as grain refiners need to be nano-sized to exert their maximum effect, but so far there is no relevant report

Method used

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  • A kind of fine-grained cemented carbide and its preparation method
  • A kind of fine-grained cemented carbide and its preparation method
  • A kind of fine-grained cemented carbide and its preparation method

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preparation example Construction

[0024] see figure 1 As shown, one aspect of the embodiments of the present invention provides a method for preparing fine-grained cemented carbide, which includes:

[0025] Provide chromium-containing metal-organic framework materials (Cr-MOF materials) as precursors;

[0026] uniformly mixing the metal-organic framework material containing chromium and hard alloy to form a hard alloy composite material;

[0027] Carrying out ball milling, granulation, compression molding, degumming and sintering treatment on the cemented carbide composite material to obtain fine-grained cemented carbide.

[0028] In some embodiments, the cemented carbide includes WC, Co, etc., but is not limited thereto.

[0029] In some embodiments, the cemented carbide composite material comprises 0.2-5 wt% metal organic framework material containing chromium, 80-96 wt% WC and 4-15 wt% Co.

[0030] In some embodiments, the preparation method includes: performing a hydrothermal reaction at 100-300° C. for...

Embodiment example

[0053] Wherein, as one of a more specific implementation case of the present invention, the preparation method of the fine-grained cemented carbide may include:

[0054] 1) dissolving chromium salts and organic ligands in water according to a certain ratio to form a mixed reaction system containing chromium ions and organic ligands;

[0055] 2) Put the mixed reaction system into a polytetrafluoroethylene-lined reaction kettle, seal it, then raise the temperature of the oven to 100-300°C, keep it warm for 2-24 hours, and carry out hydrothermal reaction;

[0056] 3) After cooling to room temperature, the reaction product was separated by filtration, washed with pure water and ethanol, and then vacuum-dried at 40-100°C for 2-12 hours to obtain a metal-organic framework material containing chromium (hereinafter referred to as Cr-MOF material );

[0057] 4) The Cr-MOF material (mass fraction 0.2-5wt%), fine-grained WC powder (mass fraction 80-96wt%) and Co powder (mass fraction 4-...

Embodiment 1

[0062] First configure 500ml of 0.1mol / L chromium nitrate aqueous solution, then add 0.05mol phthalic acid, mix well and put it into a polytetrafluoroethylene-lined reaction kettle, seal it and place it in an oven, heat it up to 150°C and keep it warm for 12h . After cooling to room temperature, the reaction product was poured out, separated by filtration, washed with pure water and ethanol during the period, and finally vacuum-dried at 60°C for 4 hours to obtain a chromium-containing MOF material (ie Cr-MOF). Cr-MOF (mass fraction 2wt%) was mixed with fine-grained WC powder (mass fraction 90.14wt%) and Co powder (mass fraction 7.84wt%) with an average particle size of 200nm, passed through planetary ball milling in ethanol medium for 12h, and ground The medium is a cemented carbide ball with a diameter of 6 mm, and the milling speed is 350 rpm. In the granulation process, a polyvinyl alcohol molding agent with a weight of 2wt% of the cemented carbide powder was added, and th...

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Abstract

The invention discloses a fine-grain hard alloy and a preparation method thereof. The preparation method comprises: generating a chromium-containing metal-organic framework material through a hydrothermal method with chromium ions and organic ligands, and uniformly mixing it with hard alloy to form a hard alloy composite material, followed by ball milling, granulation, Press molding, degumming, sintering and other treatments to obtain fine-grained cemented carbide. The present invention uses chromium-containing metal-organic framework material as the precursor of chromium carbide, can realize the uniform distribution of chromium-containing metal-organic framework material in cemented carbide, and then prepare nano-chromium carbide grain refiner in situ during the calcination process , realize the effective inhibition of grain growth of cemented carbide grains in the sintering process, and the utilization rate of the grain inhibitor is high, so as to realize the efficient preparation of fine-grained cemented carbide. The method can significantly improve the problems of adding uniformity and utilization rate of the grain inhibitor, can realize industrial production, and has important economic value.

Description

technical field [0001] The invention relates to a hard alloy material, in particular to a preparation method of a fine-grained hard alloy, and belongs to the technical field of new materials. Background technique [0002] Cemented carbide has a high melting point carbide as the hard phase, metal Co or Ni as the binder of the cermet composite material, has ultra-high hardness and strength, excellent red hardness, is widely used in machinery, mining, petroleum, Drilling and other industries, known as industrial teeth. With the growth of economic level and scale, the demand for cemented carbide in the industrial field is increasing, and more stringent requirements are put forward for its performance. It is necessary to take into account the matching of hardness, strength and toughness to be competent for high precision and high efficiency. cutting process. The improvement of strength and toughness can be achieved by further refining the grain size, which has become a research...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/08
CPCC22C1/051C22C29/067C22C29/08
Inventor 陈名海马青龙刘宁李清文
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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