Preparation method for silicon carbide ceramic tube or rod

A technology of silicon carbide ceramics and silicon carbide tubes, applied in chemical instruments and methods, ceramic molding machines, clay preparation devices, etc., can solve problems such as difficult control, poor strength, corrosion resistance, high temperature stability, and low yield. Achieve the effects of small shape and size restrictions, uniform particle dispersion, and excellent corrosion resistance

Active Publication Date: 2009-10-21
宁波欧翔精细陶瓷技术有限公司
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AI Technical Summary

Problems solved by technology

[0004] 1) The method of chemical vapor phase synthesis is to deposit a silicon carbide layer on the rod-shaped graphite, and then remove the graphite by high-temperature oxidation to obtain a silicon carbide tube or rod. A method for manufacturing silicon carbide tubular components using chemical vapor synthesis, but this method is difficult to produce thick-walled silicon carbide tubes and has high production costs, making it difficult to achieve large-scale production
[0005] 2) Although isostatic pressing can form a compact green body, as Patent No. 99120189.2 "Silicon Carbide Roller for Roller Kiln and Its Manufacturing Method" discloses a method of manufacturing silicon carbide roll for isostatic pressing, but Its cost is high, and continuous production cannot be realized, an

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  • Preparation method for silicon carbide ceramic tube or rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1), the average particle diameter is 0.5 micron, the silicon carbide powder that is 98.5% by weight, the graphite powder of 1%, the boron carbide powder of 0.5% are dry-milled for 1 hour;

[0033] 2) Add 100% water, 0.2% tetramethylammonium hydroxide, 1% polyethylene glycol, 0.5% oleic acid, and 2% polyethylene glycol to the powder after dry grinding. Alcohol wet ball milling for 8 hours to form a silicon carbide slurry with a solid content of 50%;

[0034] 3) Using a spray drying process to granulate the wet-milled silicon carbide slurry to obtain silicon carbide granulated powder; the spray drying is carried out with a spray dryer, and the process parameters are: the inlet temperature is 230°C, and the outlet temperature is 105°C, atomization pressure 1.2MPa;

[0035] 4), take the weight of granulated powder as 100%, add the water that is 13% of granulated powder weight in the granulated powder after spray-drying and carry out vacuum mud refining in vacuum mud refini...

Embodiment 2

[0045] 1) The silicon carbide powder with an average particle size of 0.6 microns, 94% by weight, 2% yttrium oxide, 1.5% aluminum oxide, and 2.5% magnesium oxide by weight were dry ball milled for 2 hours;

[0046] 2) Add 100% water, 0.2% tetramethylammonium hydroxide, 1% polyethylene glycol, 0.5% oleic acid, and 2% polyethylene glycol to the powder after dry grinding. Alcohol wet ball milling for 8 hours to form a silicon carbide slurry with a solid content of 50%;

[0047] 3) Using a spray drying process to granulate the wet-milled silicon carbide slurry to obtain silicon carbide granulated powder; the spray drying is carried out using a spray dryer, and the process parameters are: the inlet temperature is 230°C, the outlet temperature 105°C, atomization pressure 1.2MPa;

[0048]4), take the weight of granulated powder as 100%, add the water that is 15% of granulated powder weight in the granulated powder after spray-drying and carry out vacuum mud refining in vacuum mud re...

Embodiment 3

[0058] 1), the silicon carbide powder that the average particle diameter is 0.5 micron, percentage by weight is 70%, the boron carbide powder that is 1 micron, 22%, the aluminum oxide powder of 4%, the yttrium oxide powder of 3% , 1% dry ball milling of lanthanum oxide powder for 1 hour;

[0059] 2), the dry-milled powder is sequentially added in a ball mill to 100% water by weight of the main raw material, 0.2% ammonium polyacrylate, 1% sucrose fat, 0.5% stearic acid, and 2% water-soluble acrylic acid Resin is then wet ball milled for 8 hours to prepare a silicon carbide slurry with a solid content of 50%;

[0060] 3) Using a spray drying process to granulate the wet-milled silicon carbide slurry to obtain silicon carbide granulated powder; the spray drying is carried out with a spray dryer, and the process parameters are: the inlet temperature is 220°C, and the outlet temperature is 105°C, the atomization pressure is 1.2MPa;

[0061] 4), take the weight of granulated powde...

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Abstract

The invention relates to a preparation method for a silicon carbide ceramic tube or rod. An extrusion moulding method is adopted to form a blank body; a normal pressure sintering method is adopted for sintering; and submicron level silicon carbide powder and additives are taken as main raw materials. The preparation method comprises the following steps: 1) carrying out ball milling on the main raw materials by a dry method, adding water, a dispersant, a plasticizer, a lubricant and a liquid state binder, and then carrying out ball milling by a wet method; 2) adopting a spray granulation process to granulate silicon carbide slurry; 3) extruding the blank body by a one-shot direct extrusion moulding method after vacuum pug, corrosion, and vacuum pug; 4) drying the molded blank body by a stage drying mechanism; and 5) placing the blank body of the silicon carbide ceramic tube or rod in a vacuum furnace and carrying out sintering for two times by taking argon gas as protective gas. The high temperature resisting strength and the corrosion resistance of the silicon carbide ceramic tube or rod prepared by the method are both better than those of a reactive sintered product. Compared with a hot press sintering method, the method has lower limit on the product shape and size, and lower cost. The method is suitable for the industrialized production.

Description

technical field [0001] The invention relates to a preparation method, in particular to a preparation method of a silicon carbide ceramic tube or rod. Background technique [0002] As a high-temperature structural ceramic, silicon carbide ceramics have many excellent properties, such as wear resistance, high thermal conductivity, heat resistance, corrosion resistance, and excellent mechanical and thermal properties. Silicon carbide ceramics have been widely used in machinery, electronics, petrochemical, metallurgy and other industrial fields, as well as the national defense industry, and have been recognized internationally as the fourth basic material since metal, alumina, and cemented carbide. [0003] Due to its structural characteristics, silicon carbide ceramic tubes or rods are generally formed by chemical vapor phase synthesis, isostatic pressing, grouting molding, injection molding and extrusion molding, but the above methods still have the following problems: [000...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/565B28C1/18B28C1/04B28C1/16B28B3/20
Inventor 林海
Owner 宁波欧翔精细陶瓷技术有限公司
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