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Rare earth element-contained grain refiner and preparation method and application thereof

A grain refiner and rare earth element technology, which is applied in the application of cemented carbide composite grain refiner in the preparation of fine-grained cemented carbide, and in the field of cemented carbide grain refiner materials to achieve excellent comprehensive performance , the effect of small particle size and good structure design

Active Publication Date: 2019-12-31
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, MOF and its related derivatives have not been reported in the field of cemented carbide grain refiners

Method used

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  • Rare earth element-contained grain refiner and preparation method and application thereof
  • Rare earth element-contained grain refiner and preparation method and application thereof
  • Rare earth element-contained grain refiner and preparation method and application thereof

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preparation example Construction

[0027] see figure 1 As shown, one aspect of the embodiments of the present invention provides a method for preparing a rare earth element-containing grain refiner, which includes:

[0028] Provide chromium-containing metal-organic framework materials (Cr-MOF materials);

[0029] The metal-organic framework material containing chromium is infiltrated and adsorbed in the ion precursor containing rare earth elements, and then calcined to form composite chromium carbide containing rare earth elements to obtain a grain refiner containing rare earth elements.

[0030] In some embodiments, the preparation method includes: performing a hydrothermal reaction at 100-300° C. for 2-24 hours in a uniformly mixed reaction system comprising chromium ions, organic ligands and water, to obtain a metal-organic framework material containing chromium.

[0031] The invention utilizes the special space structure such as rich surface area and porous characteristics of the metal-organic framework ma...

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 the heat preservation was completed, cool to room temperature, pour out the reaction product, separate by filtration, wash with pure water and ethanol during this period, and finally vacuum-dry at 60°C for 4 hours to obtain a chromium-containing MOF material (ie Cr-MOF). Then the Cr-MOF was soaked in the lanthanum nitrate solution, separated by filtration, and vacuum-dried at 60° C. for 30 min to obtain Cr-MOF containing rare earth elements (Cr-MOF-Re). Then put the Cr-MOF-Re into the quartz tube furnace, pass through the nitrogen protection, raise the temperature to 300°C at 5°C / min, keep it for 30min, then continue to raise the temperature to 800°C at 50°C / min, keep it for 1h, and then with the furnace After co...

Embodiment 2

[0064] First configure 500ml of 0.5mol / L chromium chloride aqueous solution, then add 0.25mol terephthalic acid, mix well and put it into a polytetrafluoroethylene-lined reaction kettle, seal it and place it in an oven, heat up to 100°C and keep it warm 12h. After the heat preservation was completed, cool to room temperature, pour out the reaction product, separate by filtration, wash with pure water and ethanol during this period, and finally vacuum-dry at 60°C for 4 hours to obtain a chromium-containing MOF material (ie Cr-MOF). Then the Cr-MOF was soaked in an aqueous cerium sulfate solution, separated by filtration, and vacuum-dried at 60° C. for 30 min to obtain Cr-MOF (Cr-MOF-Re) containing rare earth elements. Then put the Cr-MOF-Re into the quartz tube furnace, pass through the nitrogen protection, raise the temperature to 300°C at 5°C / min, keep it for 30min, then continue to raise the temperature to 800°C at 50°C / min, keep it for 1h, and then with the furnace After b...

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Abstract

The invention discloses a rare earth element-contained grain refiner and a preparation method and application thereof. The preparation method comprises the following steps that a chromium ion and an organic ligand are used for generating a chromium-contained metal organic framework compound through a hydrothermal method, the compound is infiltrated and adsorbed in a rare earth element-contained precursor, then calcining treatment is carried out to form rare earth element-contained composite chromium carbide, and the rare earth element-contained grain refiner is obtained. Then the refiner is uniformly mixed with a hard alloy, and then ball milling, granulating, pressing molding, degumming, sintering and the like are conducted to obtain a fine grain hard alloy. According to the preparation method, the chromium-contained metal organic framework compound is adopted as a porous template, a rare earth component is embedded in the porous carbon and carbide framework, compositing of a rare earth compound and the chromium carbide can simultaneously play a role in grain refining and synergistic effects, the characteristics that grain growth is inhibited, uniform distribution is achieved, andthe utilization rate is high are realized, and the refiner is an efficient hard alloy grain inhibitor, and has a wide commercial prospect.

Description

technical field [0001] The invention relates to a cemented carbide grain refiner material, in particular to a rare earth element-containing grain refiner and a preparation method thereof, and the rare earth element-containing cemented carbide composite grain refiner The application in the preparation of crystal hard alloy 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. According to the Hall-Petch formula, the refinement of material grains can significantly improve the mechanical properties of materials, and is also the most effective means of strengthening and toughening. Therefore, the most effective technical way to improve the comprehensive mech...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/08
CPCC22C1/051C22C29/08
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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