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Synthesis of densified siloxate ceramic by liquified polysiloxane

A technology of liquid polysiloxane and hydrogen polysiloxane, which is applied in the field of liquid polysiloxane to synthesize dense silicon carbon ceramics, can solve problems such as complex process and sample cracking, and achieve simple and controllable process, easy preparation, The effect of easy control of the shape of the ceramic body

Inactive Publication Date: 2007-11-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process involved is relatively complicated, and the thickness is less than 0.7mm, otherwise it will cause the sample to crack

Method used

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  • Synthesis of densified siloxate ceramic by liquified polysiloxane
  • Synthesis of densified siloxate ceramic by liquified polysiloxane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using 10g of hydrogen-containing polysiloxane and 10g of tetramethyltetravinylcyclotetrasiloxane with magnetic stirring, add 0.2g of vinylsiloxane platinum complex catalyst dropwise, mix well and pour into the mold, at 20 Place it at ℃ for 48 hours to form a cross-linked body, then place it at 80℃ for 6 hours and then demould directly to prepare a green body with a circular diameter of 2.3cm. Under the protection of an argon atmosphere, the heating rate is raised to 1000 ℃, after holding for 1h, the temperature was lowered to 20℃ at a cooling rate of 2℃ / min to obtain dense SiOC amorphous ceramics. The cross-sectional appearance of this ceramic is shown in accompanying drawing 1.

Embodiment 2

[0021] Adopt 10g of hydrogen-containing polysiloxane and 5g of tetramethyltetravinyl cyclotetrasiloxane, while stirring magnetically, add 0.15g of vinylsiloxane platinum complex catalyst dropwise, mix well and pour into the mold Preliminarily form a cross-linked body at 50°C, and then place it at 100°C for 6 hours after demoulding, then raise the temperature to 800°C at a heating rate of 1°C / min in a nitrogen atmosphere, and then cool down to 800°C at a cooling rate of 2°C / min after holding for 2 hours. At 20°C, dense silicon-oxycarbon-carbon amorphous ceramics were obtained. The cross-sectional appearance of this ceramic is shown in accompanying drawing 2.

Embodiment 3

[0023] Adopt 5g of hydrogen-containing polysiloxane and 10g of tetramethyltetravinylcyclotetrasiloxane, while stirring magnetically, add 0.15g of vinylsiloxane platinum complex catalyst dropwise, mix well and pour into the mold Place at 80°C for 6 hours, dry and remove the mold, in a nitrogen atmosphere, increase the temperature at a rate of 2°C / min to 1000°C, and after holding for 4 hours, lower the temperature to 20°C at a rate of 2°C / min to obtain dense SiOC amorphous ceramics.

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Abstract

Synthesis of compact silobone ceramic from liquefied silicone is carried out by mixing silicone of hydrogen content 1.55 wt% with tetramethyl-tetravinyl cyclo-tetrasilicone in proportion of 1:2-2:1, magnetic agitating to obtain mixture, adding into vinyl-silicone ligand platinum complex catalyst, mixing, pouring it into mould, putting it into vacuum baker, cross-linking to form at 20-100 degree, drying formed blank, de-molding, raising temperature to 600-1300 degree under argon or nitrogen atmosphere and lowering temperature to room temperature to obtain final product. It's simple and controllable, has no need for pressure and different shapes.

Description

technical field [0001] The invention relates to a method for synthesizing dense silicon-oxycarbon ceramics from liquid polysiloxane, which belongs to the technical field of ceramic preparation. Background technique [0002] The preparation of ceramic materials from organic precursors is a new method developed in recent years. Compared with traditional preparation methods, it has the advantages of designing materials at the molecular scale, preparing ceramics with high-performance unconventional structures, and net-size molding. , low cracking temperature, energy saving, good high temperature performance, etc. Polysiloxane is cheap and easy to obtain, and can be processed in the air. The prepared SiOC ceramic material has good chemical stability, corrosion resistance, good high temperature resistance, and can be used for a long time at 1200 ° C. At present, some people in foreign countries heat solid commercial polysiloxane to 100 ℃ and pressurize 80 MPa to form it, and crac...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/622
Inventor 李亚利安海娇侯峰谢皎
Owner TIANJIN UNIV
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