Method for preparing silicon carbide coated graphite through molten salt isolation

A silicon carbide and molten salt technology, applied in the field of composite materials, can solve the problems of poor wettability of flake graphite, and achieve the effects of good wettability between powder and water, low preparation cost and low price

Inactive Publication Date: 2020-12-25
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Therefore, it is urgent to develop a low-cost, environmentally friendly, and uniform product size coated graphite preparation technology to solve the problem of poor wettability between flake graphite and water

Method used

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  • Method for preparing silicon carbide coated graphite through molten salt isolation
  • Method for preparing silicon carbide coated graphite through molten salt isolation
  • Method for preparing silicon carbide coated graphite through molten salt isolation

Examples

Experimental program
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Effect test

Embodiment 1

[0046]Take by weighing 7 parts of silicon powder and 6 parts of flake graphite powder by mass fraction, then weigh 13 parts of potassium chloride, put it into a ball mill jar, then add grinding balls and industrial ethanol to the ball mill jar for ball milling for 4 hours; After ball milling, put the mixed slurry into an oven and dry at 80°C for 12 hours. After drying, pass through a 40-mesh sieve to obtain granulated powder A; put granulated powder A into a φ20mm mold and press it with a uniaxial pressure of 200MPa, and put the initial sample into a cloth Press and form a φ36mm mold full of potassium chloride with a uniaxial pressure of 200MPa; place the pressed salt-encapsulated sample in an alumina crucible, put enough potassium chloride in the crucible as a salt bed to fully immerse the sample, and cover the lid Put it into a high-temperature furnace and roast at a heating rate of 5°C / min to 1400°C, hold for 3 hours, and cool down to room temperature naturally; finally, the...

Embodiment 2

[0048] Take by weighing 7 parts of silicon powder and 12 parts of flake graphite powder by mass fraction, then weigh 19 parts of potassium bromide, put it into a ball mill jar, then add grinding balls and industrial ethanol to the ball mill jar for ball milling for 4 hours; After ball milling, the mixed powder was dried in an oven at 80°C for 12 hours, and passed through a 40-mesh sieve to obtain granulated powder A after drying; the granulated powder A was put into a φ20mm mold and pressed with a uniaxial pressure of 200MPa, and the initial sample was placed in a Potassium bromide is pressed into a φ36mm mold with a uniaxial pressure of 200MPa; the pressed salt-encapsulated sample is placed in an alumina crucible, and a sufficient amount of potassium bromide is placed in the crucible as a salt bed to fully immerse the sample, and the lid is placed. Put it into a high-temperature furnace and roast at a heating rate of 5°C / min to 1350°C, hold for 4 hours, and cool down to room t...

Embodiment 3

[0050] Take by weighing 7 parts of silicon powder and 24 parts of flake graphite powder by mass fraction, then weigh 31 parts of sodium chloride, put it into a ball mill jar, then add grinding balls and industrial ethanol to the ball mill jar for ball milling for 4 hours; After ball milling, put the mixed powder in an oven and dry at 80°C for 12 hours. After drying, pass through a 40-mesh sieve to obtain granulated powder A; put the granulated powder A into a φ20mm mold and compress it with a uniaxial pressure of 200MPa, and put the initial sample into the cloth Press into a φ36mm mold full of sodium chloride with a uniaxial pressure of 200MPa; place the pressed salt packaged sample in an alumina crucible, put enough sodium chloride in the crucible as a salt bed to fully immerse the sample, and cover the lid Put it into a high-temperature furnace and roast at a heating rate of 5°C / min to 1300°C, hold for 5 hours, and cool down to room temperature naturally; finally, the product...

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Abstract

The invention relates to a method for preparing silicon carbide coated graphite by molten salt isolation. The method comprises the following steps of: weighing silicon powder, crystalline flake graphite powder and molten salt according to a set ratio, putting the weighed materials into a ball milling tank, uniformly mixing the materials to obtain mixed slurry, putting the mixed slurry into a drying oven, drying, and screening the dried powder to obtain granulation powder A; putting the granulation powder A into a mold, carrying out compression molding to obtain a green body B, wrapping the green body B with the molten salt as a filler by using a large mold, and carrying out compression molding to obtain a salt-packaged sample C; putting the salt-packaged sample C into an aluminum oxide crucible, putting enough molten salt into the crucible to completely cover the salt-packaged sample C, covering the crucible, putting the crucible into a high-temperature furnace, heating to 1300-1400 DEG C, keeping the temperature for 15h, performing roasting, and naturally cooling a product to room temperature; washing the product with deionized water to remove salt in a salt layer and the green body, performing filtering and drying to obtain graphite powder which is uniformly dispersed and completely coated with SiC. The method has the advantages of wide raw material source, low cost, short consumed time, no need of expensive argon as a protective atmosphere in the preparation process, and the like.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a method for preparing silicon carbide-coated graphite by isolation of molten salt. Background technique [0002] In order to improve the high temperature slag erosion resistance and thermal shock stability of oxide-based castables, it is usually desirable to add carbon materials to achieve this purpose. Flake graphite has complete crystallization and non-wetability with slag. It is the preferred carbon source for carbon-containing castables. However, graphite is not wet with water, and its fluidity and dispersion are poor, which leads to a large amount of water added to carbon-containing castables. As a result, the room temperature performance and high temperature performance of the castable are significantly reduced, and the porosity is significantly increased, which is not conducive to the improvement of the slag resistance of the material. To solve this problem, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/628
CPCC04B35/66C04B35/62834C04B2235/425
Inventor 贾全利尹艺程张少伟王世界刘新红
Owner ZHENGZHOU UNIV
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