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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: 2003-10-22
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%, an ash content of 0.2%, and a volatile content of 8.7% and graphite with a carbon content of 98% were crushed into powder within 1MM, and the SIO 2 Quartz sand with a content of 99.3% is broken into powder within 1.5MM; press C: SiO 2 =0.56:1 ratio, the two types of powder materials are mixed thoroughly after the ratio is mixed to become the reaction material. (2) Adding 0.15% of the reactant amount of sodium chloride and 0.05% of the reactant amount of cobalt chloride as a catalyst into the reactant, and mixing them thoroughly. (3) Load the above-prepared reaction material into an industrial SIC smelting furnace, and use 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 produced during synthesis can act as a protective gas. Turn off the furnace after the flame is extinguished. (4) The primary product of the prepared m...

Embodiment 2

[0010] Example 2: (1) Anthracite with a fixed carbon content of 88%, an ash content of 3%, and a volatile content of 6% and graphite with a carbon content of 98% were crushed into 0-1.5MM particles, and SiO 2 The content of 99.3% silica is broken into 0-2.0MM particles, and the two types of raw materials are divided into C: SiO 2 = 0.6:1 ratio of ingredients, and fully mixed. (2) Add 0.1% milling sand of the batching amount and 0.2% salt of the batching amount to the above-mentioned ingredients as a catalyst, and mix them thoroughly. (3) Put the prepared reaction material into the combined electrode multi-core SIC smelting furnace, use constant power supply, and the graphite in the furnace conducts heat. At this time, the synthesis reaction temperature is 1800℃, and the reaction time is about 30 hours. The CO produced during synthesis Play the role of protective gas, turn off the furnace after the flame of the furnace body is extinguished. (4) The prepared products are primary sil...

Embodiment 3

[0011] Example 3: The bituminous coal coke with a fixed carbon content of 89%, an ash content of 4.6%, and a volatile content of 5% and industrial graphite with 99% carbon content are crushed into 0-0.5MM particles, and the SiO 2 The 99% silica sand is broken into 0-0.5MM particles, and the two types of raw materials are divided into C: SiO 2 = 0.7:1.0 ratio of ingredients, and fully mixed. (2) Put the prepared reaction material into the combined electrode multi-core SIC smelting furnace, use constant power supply, the graphite in the furnace conducts heat, the reaction temperature is 2000 ℃, 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 turned off. (3) The prepared product is the primary silicon carbide whisker and the derivative with a content of about 50%, and the primary product is purified from 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 fine powder, in particular to a method for industrially preparing silicon carbide whiskers and fine powder. Background technique [0002] Silicon carbide whiskers and micropowders have high melting point, high strength, high modulus, low thermal expansion, corrosion resistance, wear resistance and other excellent properties. They are used as reinforcing and toughening agents for metal matrix, ceramic matrix and other composite materials, as well as structural ceramics, and advanced High-grade raw materials for refractory materials and coating materials are widely used in the fields of machinery, electronics, aerospace and energy. However, the existing preparation methods, such as acid-treated carbonized rice husks and SiO, are often used in China. 2 Adjust the raw materials and add the composite catalyst into the graphite crucible, put it into the high-temperature furnace, pass the...

Claims

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Application Information

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