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Industrial preparation method for silica carbide crystal whisker and micropowder

A silicon carbide whisker and industrial technology, which is applied in the field of preparation of silicon carbide whiskers and micropowder, can solve the problems of difficulty in mass industrial production, high purity and cost of raw materials, complex structure of high-temperature furnaces, etc., and achieves abundant and cheap raw material sources. , The effect of long synthesis time and uniform product diameter

Inactive Publication Date: 2008-09-03
XIAN BOER NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods all have the following defects: 1. The purity and cost of raw materials are high; 2. The high-temperature furnace used in production has a complex structure and high cost; 3. The production process is complicated and the synthesis is difficult; 4. The high-temperature heating process belongs to external heating of raw materials , so the heating is uneven, the heating time is short, and more irregular crystals are produced; 5. Due to the above reasons, the production cost is high and the output is small, so it is difficult to mass-produce industrially

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1: (1) Petroleum coke with a fixed carbon content of 90%, ash content of 0.2%, volatile content of 8.7%, and graphite with a carbon content of 98% are broken into powders within 1MM, and S i o 2 Quartz sand with a content of 99.3% is broken into powder within 1.5MM; according to C:S i o 2 =0.56:1 ratio, the two types of powders are mixed thoroughly after proportioning to become the reaction material. (2) 0.15% sodium chloride of the reaction mass and 0.05% cobalt chloride of the reaction mass are added in the reaction mass as a catalyst, and fully mixed. (3) Put the above-mentioned prepared reaction materials into an industrial SIC smelting furnace, and use a constant power supply for smelting. At this time, the synthesis reaction temperature is 1400 ° C, and the reaction time is about 2 hours. The CO generated during the synthesis can act as a protective gas. Turn off the furnace after the flame of the furnace body is extinguished. (4) The prepared silicon ...

Embodiment 2

[0010] Embodiment 2: (1) anthracite with fixed carbon content 88%, ash content 3%, volatile matter content 6% and graphite containing carbon 98% are broken into 0-1.5MM particle, S i o 2 The silica with a content of 99.3% is crushed into particles of 0-2.0MM, and the two types of raw materials are separated by C:S i o 2 =0.6:1 ratio ingredients, and fully mixed. (2) Add 0.1% of the milling sand and 0.2% of the batching amount of salt as a catalyst into the above batching, and mix well. (3) Put the prepared reaction material into the combined electrode multi-core SIC smelting furnace, and use constant power to supply power. The graphite in the furnace conducts heat. It acts as a protective gas, and the furnace is turned off after the flame of the furnace body is extinguished. (4) The obtained product is primary silicon carbide whisker and micropowder with a content of 40-50%, and the primary product is taken out of the furnace for purification.

Embodiment 3

[0011] Example 3: Bituminous coal coke with a fixed carbon content of 89%, an ash content of 4.6%, and a volatile content of 5% and industrial carbon-containing 99% graphite are broken into 0-0.5MM particles, and the S i o 2 Silica sand with a content of 99% is broken into particles of 0-0.5MM, and the two types of raw materials are divided into C:S i o 2 =0.7:1.0 ratio ingredients, and fully mixed. (2) Put the prepared reaction material into the combined electrode multi-core SIC smelting furnace, and use constant power to supply power. The graphite in the furnace conducts heat. At this time, the reaction temperature is 2000 ° C, and the synthesis reaction time is about 60 hours. CO can act as a protective gas until the flame in the furnace is extinguished and the furnace is shut down. (3) The obtained products are primary silicon carbide whiskers and microbes with a content of about 50%, and the primary products are purified out of the furnace.

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Abstract

The industrial preparation method of silicon carbide whiskers and micrpowder is characterized by that the graphite and other industrial carbon and silicon raw materials are mixed, and placed into industrial SiC smelting furnace to make synthesis reaction, the graphite is used as conductive heating body to prepare silicon carbide whiskers and micropowder. Said preparation method is simple, the diameter of whiskers produced by said invented method is uniform, and length-diameter ratio is large and the heteromorphous crystal is less, and product quality is high.

Description

technical field [0001] The invention relates to a method for preparing silicon carbide whiskers and micropowders, in particular to a method for industrially preparing silicon carbide whiskers and micropowders. Background technique [0002] Silicon carbide whiskers and micropowder have high melting point, high strength, high modulus, low thermal expansion rate, corrosion resistance, wear resistance and other excellent properties. Advanced raw materials for refractory materials and coating materials are widely used in the fields of machinery, electronics, aerospace and energy. However, in the existing preparation methods, acid treatment carbonized rice husk is often used in China, and SiO 2 Adjust the raw materials, add a composite catalyst, put it into a graphite crucible, put it into a high-temperature furnace, pass in a protective gas Ar gas, and carry out a carbothermal reduction reaction at a high temperature to prepare silicon carbide whiskers; and the invention patent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/36C30B29/62C30B29/36
Inventor 王晓刚李晓池
Owner XIAN BOER NEW MATERIAL CO LTD
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