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Sialon nano non-woven fabric and preparation method thereof

A technology of nano-nonwoven fabrics and graphite sheets, which is applied in the direction of non-woven fabrics, textiles and papermaking, etc., can solve the problem that the preparation method of Sialon nano-nonwoven fabrics has not been reported, it is difficult to obtain uniform size nanobelts or lines, and the growth of parts is not good. The same problem, to achieve the effect of good uniformity and operability, clean surface and perfect structure

Inactive Publication Date: 2009-11-04
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the problems faced by the preparation of Sialon nanobelts (wires) and their composite materials are: 1. The efficiency is relatively low, the output is small, and there are many impurities; 2. The growth conditions of different parts are different, and it is difficult to obtain uniform size nanobelts or wires; 3. .Facing the problem of environmental pollution; 4. How to uniformly disperse nanoribbons (wires) in composite materials has always been a major problem in engineering circles
[0005] So far, there is no report about Sialon nanometer non-woven fabric and its preparation method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Sialon nano non-woven fabric, which is a fabric with a fiber mesh structure formed by Sialon nanobelts. The width of Sialon nanobelts is 500nm, the thickness is 60nm, and the length is 500um. The preparation method of Sialon nano non-woven fabric, a. Mix 198ml of hydrogen-containing silicone oil, 155ml of ethylenediamine and 6 grams of Al powder, and carry out the reaction in a reaction kettle. 250ml of normal hexane, stirred continuously at normal temperature for 8-12 hours, reacted to form Si-Al-O-N-C polymer; Inject nitrogen, the nitrogen flow rate is 200-400ml / min, the temperature process is within the temperature range of room temperature to 750°C, the heating rate is 5°C / min, and the temperature is kept at 750°C for 1 hour, and within the temperature range of 750-1000°C, The heating rate is 5°C / min, and the temperature is kept at 1000°C for 1 hour to obtain Si-Al-O-N-C powder; b. Mix Si-Al-O-N-C powder and ethanol to make a precursor slurry, and ethanol accounts f...

Embodiment 2

[0017] A Sialon nano non-woven fabric and a preparation method thereof, which is a fabric of a fiber net structure formed by Sialon nanowires, the diameter of the nanowires is 80nm, and the length is 1000um. Its preparation method steps are: a. Mix 169ml of hydrogen-containing silicone oil, 274ml of ethylenediamine and 15g of Al powder, and carry out the reaction in a reactor. The reaction temperature is controlled at 0-100°C, and the solvents used are 500ml of tetrahydrofuran and n-hexane 250ml, stirred continuously at room temperature for 8 to 12 hours, and reacted to form Si-Al-O-N-C polymer. Other steps and processing condition are identical with specific embodiment 1. Finally, a pure Sialon nanometer non-woven fabric with a thickness of 4 mm was obtained.

Embodiment 3

[0019] A kind of Sialon nanometer non-woven fabric, it is the fabric of the fiber network structure that is formed by Sialon nano-belt, and Sialon nano-belt width is 300nm, and thickness is 40nm, and length is 800um. This Sialon nanometer nonwoven fabric preparation method, it differs from specific embodiment 1 its place is that step e. will form the graphite sheet or graphite paper of Sialon nanometer nonwoven fabric, under the air environment of 1000 ℃, keep warm for 1 hour, can Graphite is removed, what remains is a pure Sialon nano non-woven fabric with a thickness of 6mm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention relates to a Sialon nano non-woven fabric, which is a fiber web fabric with a Sialon quasi-one-dimensional nano structure formed by self-assembling a SiAlONC precursor thin layer coated on the surface of a graphite flake or a piece of graphite paper through the air pressure reaction of high-pressure nitrogen. A preparation method for the nano non-woven fabric comprises the following steps: coating SiAlONC precursor slurry of which thickness is 0.1 to 5 millimeters on the surface of the graphite flake or the graphite paper, placing the graphite flake or the graphite paper coated with the slurry into an atmospheric pressure sintering furnace, introducing nitrogen into the furnace, preserving heat for 1 to 3 hours under the conditions of controlling the nitrogen pressure in the furnace at 0.3 to 2.0MPa and controlling the temperature to between 1,200 and 1,600 DEG C, forming the Sialon nano non-woven fabric on the surface of the graphite flake or the graphite paper, and finally removing the graphite flake or the graphite paper by burning to obtain the pure Sialon nano non-woven fabric. The Sialon nano non-woven fabric has the advantages of good dielectric property, high strength, corrosion resistance, and good evenness and operability.

Description

technical field [0001] The invention relates to a nanometer cloth and a preparation method thereof, in particular to a high-temperature-resistant and high-strength Sialon nanometer non-woven fabric and a preparation method thereof. Background technique [0002] Sialon material has a series of excellent properties such as high strength, high hardness, high toughness, wear resistance, corrosion resistance, oxidation resistance, thermal shock resistance, low thermal expansion, self-lubrication, good thermal conductivity, electrical insulation, etc. It is used in aviation, aerospace, electronics, It has been widely used in metallurgy, machinery, petroleum, chemical industry, energy, transportation, electrical appliances and other fields. It is an important class of structural materials, high-temperature materials and dielectric insulation materials. At present, in addition to the direct application of bulk materials and coatings, Sialon materials also have an important applicati...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): D04H13/00C04B35/622C04B35/599
Inventor 温广武覃春林宋亮夏龙王鑫宇
Owner HARBIN INST OF TECH AT WEIHAI
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