Preparation method and use of nano-SiC whisker

A whisker and carbon source technology, which is applied in the field of preparing high-quality silicon carbide whiskers, can solve the problems of limited yield of SiC whiskers, and achieve the effects of improving purity, improving industrial production capacity, and optimizing yield

Inactive Publication Date: 2013-11-06
JIANGSU RUILI NEW MATERIAL SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of catalyst can promote the reaction to a certain extent, but it has limited effect on improving the yield of SiC whiskers

Method used

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  • Preparation method and use of nano-SiC whisker
  • Preparation method and use of nano-SiC whisker
  • Preparation method and use of nano-SiC whisker

Examples

Experimental program
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Effect test

example 1

[0029] Example 1 : Preparation of smooth SiC whiskers

[0030] 3 grams of commercial carbon source and 3 grams of lime were mixed uniformly by ball milling (the ratio of ball to material is 20:1). The mixture was molded under 300MPa pressure, put into an atmosphere furnace, heated to 1500°C at a rate of 10°C / min, and kept at this temperature for 200 minutes, after cooling to room temperature, the product was collected. The product was heat treated (700°C) in air for 60 minutes. Finally, purified SiC whiskers are obtained.

example 2

[0031] Example 2 : Preparation of Beaded SiC Whiskers

[0032] 3 grams of commercial carbon source and 5 grams of lime were mixed uniformly by ball milling (the ratio of ball to material was 20:1). The mixture was molded under 300MPa pressure, put into an atmosphere furnace, heated to 1500°C at a rate of 10°C / min, and kept at this temperature for 100 minutes, and the product was collected after cooling to room temperature. The product was heat treated (700°C) in air for 60 minutes. Finally, purified beaded SiC whiskers were obtained.

example 3

[0033] Example 3 : SiC whisker dispersion system

[0034] Disperse SiC whiskers in water by an ultrasonic disperser, and it is worth SiC whisker dispersion liquid. Add 0.06 g of SiC whiskers into 150 g of water, and disperse them through ultrasonic vibration to form a whisker dispersion.

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Abstract

The invention discloses a preparation method of a nano-SiC whisker. The preparation method has a whisker yield of 100%. The preparation method adopts a uniform mixture of a commercial carbon source and rice husk lime as raw materials. The preparation method comprises the following steps of heating the uniform mixture to a high temperature of 1500 DEG C in an inert atmosphere, carrying out heat preservation at the temperature for a certain time, after the reaction, heating the reaction products mainly comprising nano beta-SiC whiskers which have smooth surfaces or are provided with granules on the surface thereby forming beading structures to a temperature of 700 DEG C in air, and carrying out heat preservation for 120min to remove residual carbon so that a high-purity SiC whisker product is obtained, wherein the high-purity SiC whisker product has the diameter of 200-400nm and the length of dozens of microns. SiC has a series of excellent properties and thus SiC can be widely used, for example, SiC can be used for a reinforcing phase of a composite material and for increasing a heat transfer coefficient of a hot fluid. The SiC whisker having a beading structure can be used for reinforcement of a composite material. Compared with the traditional smooth fibers, the SiC whisker has better effects. The SiC whisker can greatly improve a heat transfer coefficient of a hot fluid.

Description

technical field [0001] The invention relates to a method for preparing high-quality silicon carbide whiskers by using rice husks and commercial carbon sources as raw materials, and two applications of the prepared silicon carbide whiskers. Background technique [0002] As a ceramic material with superior performance, SiC has excellent characteristics such as high Young's modulus, high temperature strength, low specific gravity, strong chemical stability, corrosion resistance, and thermal shock resistance, so it has a wide range of uses. SiC has more than two hundred crystal forms and various forms, including particles, whiskers, fibers, and bulk SiC. Different morphologies have an important impact on its performance. Considering different usage purposes, it is very important to select the corresponding SiC material to make full use of its excellent performance. [0003] As a crystal form of SiC, β-SiC is very important in academia and industry, and has important and extensi...

Claims

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Application Information

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IPC IPC(8): C01B31/36B09B3/00C09K5/10C08L63/00C08K7/10C01B32/956
Inventor 张培根郭晟旻邢乃文梁建栋王开阳
Owner JIANGSU RUILI NEW MATERIAL SCI & TECH CO LTD
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