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Method for preparing SiC/TiC composite ceramic by precursor method

A technology of composite ceramics and composite powders, which is applied in the field of preparation of SiC/TiC composite ceramics, can solve the problems of uneven microstructure, high sintering temperature, coarse grains, etc., and achieve excellent oxidation resistance and chemical corrosion resistance. The effect of low temperature and high hardness

Active Publication Date: 2016-01-06
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are technical defects such as high sintering temperature, uneven material microstructure, and coarse grains in these processes.

Method used

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  • Method for preparing SiC/TiC composite ceramic by precursor method
  • Method for preparing SiC/TiC composite ceramic by precursor method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Add 3.69 grams of PCS to 50 ml of cyclohexane, fully dissolve it, and prepare a PCS transparent solution, and then add 1 gram of Ti powder into it. Heating while stirring, the temperature was gradually raised to 60°C, and kept stirring for 60 minutes. Then put it into a drying oven to continue evaporating the solvent for 60 minutes, and dry to obtain a mixture of PCS and Ti powder.

[0023] (2) Pyrolyze the mixture of the obtained PCS and Ti powder in a high-temperature furnace, the pyrolysis atmosphere is argon, the heating rate is 5°C / min, from room temperature to 1050°C, and the temperature is kept for 60 minutes to obtain a SiC / TiC composite powder.

[0024] (3) Put the obtained SiC / TiC composite powder into a graphite mold, put it into a hot-press sintering furnace, raise the temperature to 1500°C at a rate of 15°C / min under vacuum, fill it with argon, and sinter with a sintering pressure of 25MPa, and hold for 30 Minutes to obtain SiC / TiC composite ceramics....

Embodiment 2

[0026] (1) Add 3.69 grams of PCS to 50 ml of cyclohexane, fully dissolve, and prepare a PCS transparent solution, and then add 1.5 grams of Ti powder to it. Heating while stirring, the temperature was gradually raised to 63°C, and kept stirring for 60 minutes. Then put it into a drying oven to continue evaporating the solvent for 60 minutes, and dry to obtain a mixture of PCS and Ti powder.

[0027] (2) Pyrolyze the mixture of the obtained PCS and Ti powder in a high-temperature furnace, the pyrolysis atmosphere is argon, the heating rate is 8°C / min, from room temperature to 1080°C, and the temperature is kept for 100 minutes to obtain a SiC / TiC composite powder.

[0028] (3) Put the obtained composite powder into a graphite mold, put it into a hot-press sintering furnace, raise the temperature to 1550°C at a rate of 17°C / min under vacuum, fill it with argon, and sinter with a sintering pressure of 30MPa and keep it warm for 45 minutes. Obtain SiC / TiC composite ceramics. Th...

Embodiment 3

[0030] (1) 3.69 grams of PCS was added to 50 ml of cyclohexane, fully dissolved to prepare a PCS transparent solution, and then 2 grams of Ti powder was added to it. Heating while stirring, gradually raising the temperature to 65°C, keeping warm and stirring. Then put it into a drying oven and continue to evaporate the solvent for 60 minutes until the system is difficult to stir, and dry to obtain a mixture of PCS and Ti powder.

[0031] (2) Pyrolyze the mixture of the obtained PCS and Ti powder in a high-temperature furnace, the pyrolysis atmosphere is argon, the heating rate is 10°C / min, from room temperature to 1100°C, and the temperature is kept for 120 minutes to obtain a SiC / TiC composite powder.

[0032] (3) Put the obtained SiC / TiC composite powder into a graphite mold, put it into a hot-press sintering furnace, raise the temperature to 1600°C at 20°C / min under vacuum, fill it with argon, and sinter with a sintering pressure of 35MPa and a heat preservation temperatur...

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Abstract

The invention relates to a method for preparing SiC / TiC composite ceramic by a precursor method. The method of the invention is characterized by comprising the following steps: (1) fully dissolving PCS with a solvent so as to prepare a PCS transparent solution; adding Ti powder; heating, stirring and removing the solvent by steaming until the system is hard to stir; and drying to obtain a mixture of PCS (polycarbosilane) and Ti powder; (2) carrying out high-temperature pyrolysis on the mixture of PCS and Ti powder in a high temperature furnace in the inert atmosphere so as to obtain a SiC / TiC composite powder; and (3) carrying out hot pressed sintering densification on the SiC / TiC composite powder to obtain the SiC / TiC composite ceramic. The technology of the method is simple; sintering temperature is low; and the prepared SiC / TiC composite material has uniform microstructure, fine grain size and high hardness.

Description

technical field [0001] The invention belongs to the field of preparing SiC / TiC composite ceramics, and in particular relates to a method for preparing SiC / TiC composite ceramics by using a precursor method. Background technique [0002] Titanium carbide (TitaniumCarbide, TiC) has a high melting point (3060 ° C), high hardness (30Gpa), good chemical and thermal stability, excellent wear resistance and corrosion resistance. As an important structural ceramic material, TiC has been widely used in high-tech fields such as machinery, aviation, and microelectronics. With the development of modern science and technology, the application fields of TiC ceramics are becoming more and more extensive. In the 1990s, TiC has been paid attention to as a material for generation 4 nuclear reactors. However, poor fracture toughness and oxidation resistance severely limit the application of TiC ceramic materials in high temperature and high radiation environments. Toughening and strengtheni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/571C04B35/56C04B35/65
Inventor 陈文怡
Owner WUHAN UNIV OF TECH
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