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Preparation method of strong-controllability high-purity porous titanium silicon carbon ceramic

A technology for ceramic preparation and porous titanium, which is applied in the field of preparation of porous ceramics, can solve the problems that the porosity and pore structure of porous materials cannot be effectively controlled, restrict commercial production and application, and complicate preparation procedures, so as to facilitate mass production and remove Easy and simple experimental process conditions

Inactive Publication Date: 2017-05-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pore-forming principle of this method is through the volatilization of silicon element during sintering and the pores generated by powder sintering shrinkage. The porosity and pore structure of porous materials can hardly be effectively controlled and the preparation procedures are complicated, which limits its commercial production and application.

Method used

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  • Preparation method of strong-controllability high-purity porous titanium silicon carbon ceramic
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  • Preparation method of strong-controllability high-purity porous titanium silicon carbon ceramic

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Embodiment 1

[0027] A method for preparing high-purity porous titanium-silicon-carbon ceramics with strong controllability, comprising the steps of:

[0028] 1) Mix the three powders of titanium, silicon and graphite in a V-type powder mixer at a stoichiometric ratio of 3:1.3:2 for 24 hours until the powders are fully mixed evenly, and mix with sodium chloride particles with a particle size of 500-600 μm Mix in the powder mixer for 8~12 hours according to the mass ratio of 2:3;

[0029] 2) Pour the dry mixed powder into a steel mold, and press it on a CMT5105 electronic universal testing machine with a pressure of 1000MPa to form a green body with a diameter of about 20 mm and a height of about 5 mm;

[0030] 3) Soak the green body in cold water for 48 hours to remove sodium chloride to obtain a porous green body, and then dry it for later use;

[0031] 4) Put the porous green body in the Triumph vacuum furnace, firstly raise the temperature to 800°C at a rate of 10°C / min, then raise the ...

Embodiment 2

[0034] A method for preparing high-purity porous titanium-silicon-carbon ceramics with strong controllability, comprising the steps of:

[0035] 1) Mix the three powders of titanium, silicon and graphite in a V-type powder mixer at a stoichiometric ratio of 3:1.3:2 for 24 hours until the powders are fully mixed evenly, and mix with sodium chloride particles with a particle size of 75-150 μm Mix in the powder mixer for 8~12 hours according to the mass ratio of 2:3;

[0036] 2) Pour the dry mixed powder into a steel mold, and press it into a green body with a diameter of about 20 mm and a height of about 5 mm on a CMT5105 electronic universal testing machine with a pressure of 800 MPa;

[0037] 3) Soak the green body in cold water for 56 hours to remove sodium chloride to obtain a porous green body, and then dry it for later use;

[0038] 4) Put the porous green body in the Kaixuan vacuum furnace, first raise the temperature to 800°C at a rate of 10°C / min, then raise the temper...

Embodiment 3

[0040] A method for preparing high-purity porous titanium-silicon-carbon ceramics with strong controllability, comprising the steps of:

[0041] 1) Mix the three powders of titanium, silicon, and graphite in a V-type powder mixer at a stoichiometric ratio of 3:1:2 for 24 hours until the powders are fully mixed evenly, and mix with sodium chloride particles with a particle size of 500-600 μm Mix in the powder mixer for 8~12 hours according to the mass ratio of 3:2;

[0042] 2) Pour the dry mixed powder into a steel mold, and press it on a CMT5105 electronic universal testing machine with a pressure of 1000MPa to form a green body with a diameter of about 20 mm and a height of about 5 mm;

[0043] 3) Soak the green body in cold water for 60 hours to remove sodium chloride to obtain a porous green body, and then dry it for later use;

[0044] 4) Put the porous green body in the Triumph vacuum furnace, first raise the temperature to 800°C at a rate of 10°C / min, then raise the tem...

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Abstract

The invention discloses a preparation method of a strong-controllability high-purity porous titanium silicon carbon ceramic. The preparation method comprises the following steps of (1) fully mixing titanium, silicon and graphite powders according to a stoichiometric ratio of 3:(1-2):2, and mixing with a sodium chloride particle with different particle sizes according to a mass ratio of 9:1 to 1:4 in a powder mixing machine for 8 to 12h; (2) pouring the dry mixed powder into a steel die, and pressing into a blank at the temperature of 100 to 1500MPa; (3) soaking the blank into cold water, and removing sodium chloride, so as to obtain a porous blank; drying for further use; (4) putting the porous blank into a vacuum furnace, heating to 500 to 2000 DEG C at the rate of 1 to 30 DEG C / min, warming for 1 to 5h, and cooling along with a furnace, so as to obtain the porous titanium silicon carbon ceramic. The preparation method has the advantages that the technology preparation is simple, the cost is low, the limitation to preparation equipment is little, and the preparation method is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of preparation of porous ceramics, in particular to a method for preparing porous titanium-silicon-carbon composite ceramics with high purity and strong controllability. Background technique [0002] Titanium silicon carbon ceramics (Ti 3 SiC 2 ) is a ternary carbide with both metal and ceramic properties. It has good thermal conductivity and electrical conductivity, low hardness and high Young's modulus, ductility at room temperature, and high temperature at high temperature. Thermal stability and plasticity; at the same time, it also has the advantages of high yield strength, high melting point, oxidation resistance and thermal shock resistance. Due to its layered structure and low coefficient of friction, titanium silicon carbon ceramic materials can effectively replace MoS 2 , graphite and other self-lubricating materials. Based on the above remarkable properties, porous titanium-silicon-carbon composite ceram...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/626C04B38/04
CPCC04B35/5615C04B35/626C04B38/04C04B2235/404C04B2235/425C04B2235/428C04B2235/5248
Inventor 李烈军周超兰倪东惠陈紫默鲁艳军
Owner SOUTH CHINA UNIV OF TECH