Method for synthesis of sialon ceramic fiber by combination of electrostatic spinning and carbothermal reduction nitridation

A technology of ceramic fiber and electrospinning, which is applied in the field of high-temperature structural ceramic fiber preparation, can solve problems such as large limitations, and achieve the effects of simple equipment, adjustable components, and mild and controllable preparation conditions.

Active Publication Date: 2014-05-07
江苏先进无机材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present the synthetic method of Sialon ceramic fiber is limited very much, and is mostly limited to the synthesis of common Sialon ceramic material, for example, the applicant discloses a kind of nano casting combined with carbothermal reduction nitriding to prepare high-purity β-Sialon ceramics in Chinese patent CN101698610A Powder method, Chinese patent CN102115332A discloses a method for preparing high-strength β-Sialon ceramics by adding sintering aids using pressureless sintering technology
However, there is no relevant report on the preparation of Sialon ceramic fibers by electrospinning technology.

Method used

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  • Method for synthesis of sialon ceramic fiber by combination of electrostatic spinning and carbothermal reduction nitridation
  • Method for synthesis of sialon ceramic fiber by combination of electrostatic spinning and carbothermal reduction nitridation
  • Method for synthesis of sialon ceramic fiber by combination of electrostatic spinning and carbothermal reduction nitridation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Use the first type of aluminum source: aluminum nitrate nonahydrate to prepare Sialon ceramic fiber. The mass ratio of aluminum nitrate nonahydrate, ethyl orthosilicate and sucrose is 1:1:0.93. Other raw materials and their proportioning and preparation methods are as follows: (1) Weigh 4.65g of sucrose and 5g of aluminum nitrate nonahydrate and add them to the mixed solution of 20g of water and 5g of ethanol, stir well to dissolve. Then add 3.5g of polyvinylpyrrolidone, and stir until transparent viscous liquid. (2) Weigh 5g of ethyl orthosilicate, add it to the mixture of 5g of absolute ethanol and 1g of water, stir for 2 hours, and mix well. (3) Mix the solution prepared in step (2) with the solution prepared in step (1), and stir for 1 hour to obtain a spinning dope. (4) Add the prepared spinning stock solution into the syringe, adjust the spinning voltage to 15kV, the propulsion speed parameter of the syringe is 1ml / h, the needle is No. 7 needle, the receiving dev...

Embodiment 2

[0041] Use the first type of aluminum source: aluminum nitrate nonahydrate to prepare Sialon ceramic fiber. The mass ratio of aluminum nitrate nonahydrate, ethyl orthosilicate and sucrose as the raw material is 2:1:0.9 as an example. Other raw materials and their proportions and preparation methods As follows: (1) Weigh 3.6g of sucrose and 8g of aluminum nitrate nonahydrate and add them to 25g of water, stir well to dissolve. Then add 3.8g of polyvinylpyrrolidone, stir until transparent viscous liquid. (2) Weigh 4g of tetraethyl orthosilicate, add it to the mixture of 6g of absolute ethanol and 1g of water, stir for 2 hours, and mix well. (3) Mix the solution prepared in step (2) with the solution prepared in step (1), and stir for 2 hours to obtain a spinning stock solution. (4) Add the prepared spinning stock solution into the syringe, adjust the spinning voltage to 20kV, the propulsion speed parameter of the syringe is 4ml / h, the needle is No. 6 needle, the receiving devic...

Embodiment 3

[0043] Use the first type of aluminum source: aluminum nitrate nonahydrate to prepare Sialon ceramic fiber. The mass ratio of aluminum nitrate nonahydrate, ethyl orthosilicate and sucrose as the raw material is 3:1:1.3 as an example. Other raw materials and their proportioning and preparation methods As follows: (1) Weigh 3.9g of sucrose and 9g of aluminum nitrate nonahydrate and add them to the mixed solution of 20g of water and 12g of ethanol, stir well to dissolve. Then add 4g of polyvinylpyrrolidone and stir until transparent viscous liquid. (2) Weigh 3g of ethyl orthosilicate, add it to the mixture of 3g of absolute ethanol and 1g of water, stir for 2h, and mix well. (3) Mix the solution prepared in step (2) with the solution prepared in step (1), and stir for 2 hours to obtain the spinning source solution. (4) Add the prepared spinning stock solution into the syringe, adjust the spinning voltage to 10kV, the propulsion speed parameter of the syringe is 0.2ml / h, the need...

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Abstract

A method for synthesis of Sialon ceramic fiber by combination of electrostatic spinning and carbothermal reduction nitridation is as follows: using tetraethoxysilane as a silica source, aluminum nitrate ennea-hydrate or aluminum chloride is used as an aluminum source, sucrose is used as a carbon source, polyvinylpyrrolidone is used as a polymer for preparing a spinning solution; using the spinning solution for electrostatic spinning to prepare a ceramic fiber precursor; using the ceramic fiber precursor for carbothermal reduction nitridation to prepare the Sialon ceramic fiber. According to the method, the Sialon ceramic fiber is prepared by combination of electrostatic spinning and carbothermal reduction nitridation, the Sialon ceramic fiber prepared by the method can be used for compounding toughening ceramic materials and reducing the thermal conductivity, and has great application potential in the fields of aerospace and other high temperature structural materials.

Description

technical field [0001] The invention belongs to the field of preparation of high-temperature structural ceramic fibers, and relates to a method for synthesizing Sialon ceramic fibers, in particular to a method for synthesizing Sialon ceramic fibers by combining electrospinning with carbon thermal reduction and nitriding. Background technique [0002] Ceramic fibers have the advantages of light weight, high temperature resistance, good thermal stability, and adjustable thermal conductivity, and are often used as reinforcements for high-temperature structural composite materials. For example, in the current gasoline engine, about 78% of the combustion energy is lost in heat transfer. In order to reduce this part of the loss, ceramic materials with good heat insulation performance are used to surround the combustion chamber for heat insulation, and then the exhaust gas turbocharger is used. Converter and power turbine to recover exhaust energy. Valves, adiabatic engines, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/599C04B35/622C04B26/26
Inventor 刘茜卢琦庄建东周遥
Owner 江苏先进无机材料研究院
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