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Preparation method of silicon carbide ceramic heat-exchange tube and product prepared by method

A technology of silicon carbide ceramics and heat exchange tubes, applied in the field of engineering ceramics preparation, can solve the problems of unfavorable promotion of SiC heat exchangers, large equipment investment and energy consumption, high requirements for green body strength, etc., and achieves reduction in equipment and related configuration investment. Small size, improved yield and high green body density

Active Publication Date: 2018-08-14
潍坊六方碳化硅陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires the use of an intermediate process to synthesize AlN in carbon powder and silicon carbide powder, which is inefficient and time-consuming.
[0006] All of the above methods have high requirements on the strength of the green body when the SiC tube is extruded, and the molding pass rate is relatively low; in addition, the sintering temperature must be above 2000 °C, the equipment investment and energy consumption are large, and the manufacturing cost is high, which is not conducive to SiC. Promotion of heat exchangers

Method used

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  • Preparation method of silicon carbide ceramic heat-exchange tube and product prepared by method
  • Preparation method of silicon carbide ceramic heat-exchange tube and product prepared by method
  • Preparation method of silicon carbide ceramic heat-exchange tube and product prepared by method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Embodiment 1: Preparation of the silicon carbide ceramic heat exchange tube of the present invention

[0068] raw material

[0069] Silicon carbide powder: 65kg, of which, particle size 0.5μm: 7.6kg; particle size 10μm: 38.2kg; particle size 20μm: 19.2kg;

[0070] Carbon black: 25kg, particle size is 20μm;

[0071] Naphthalene sulfonate: 10kg;

[0072] Water: 30kg;

[0073] Yellow dextrin: 5kg;

[0074] Stearic acid: 0.4kg,

[0075] Oleic acid: 0.1kg;

[0076] Polyacrylic acid: 3kg;

[0077] Metal silicon powder: 97.5kg, particle size 10mm.

[0078] (1) Dry-mix silicon carbide micropowder, carbon black, and naphthalene-based sulfonate, put them into a V-type mixer and mix for 3 hours, and pour them into the kneader after mixing evenly; in addition, add water, yellow dextrin, hard Fatty acid, oleic acid, and polyacrylic acid are mixed and stirred evenly, then sprayed into the kneader, and stirred for 2 hours;

[0079] (2) The material that step (1) is obtained...

Embodiment 2

[0084] Embodiment 2: Preparation of the silicon carbide ceramic heat exchange tube of the present invention

[0085] raw material

[0086] Silicon carbide powder: 85kg, of which particle size 0.5μm: 21.25kg; particle size 10μm: 42.5kg; particle size 20μm: 21.25kg;

[0087] Carbon black: 8kg, particle size is 45μm;

[0088] Naphthalene sulfonate: 7kg;

[0089] Water: 15kg;

[0090] Cross-linked starch: 2kg;

[0091] Polyvinyl alcohol: 1kg;

[0092] Magnesium stearate: 0.2kg;

[0093] Tetramethylammonium hydroxide: 0.1kg;

[0094] Metal silicon powder: 70kg, particle size 6mm.

[0095] (1) Dry-mix silicon carbide micropowder, carbon black, and naphthalene-based sulfonate, put them into a V-type mixer and mix for 3 hours, and pour them into the kneader after mixing evenly; Vinyl alcohol, magnesium stearate, and tetramethylammonium hydroxide were mixed and stirred evenly, then sprayed into the kneader, and stirred for 4 hours;

[0096] (2) pack the material that step (1...

Embodiment 3

[0101] Embodiment 3: Preparation of the silicon carbide ceramic heat exchange tube of the present invention

[0102] raw material

[0103] Silicon carbide powder: 77kg, of which, particle size 0.5μm: 14kg; particle size 10μm: 42kg; particle size 20μm: 21kg;

[0104] Carbon black: 16kg, particle size is 15μm;

[0105] Naphthalene sulfonate: 7kg;

[0106] Water: 15kg;

[0107] Yellow dextrin: 3kg;

[0108] Polyvinyl alcohol: 2kg;

[0109] Stearic acid: 0.4kg;

[0110] Tetramethylammonium hydroxide: 0.15kg;

[0111] Metal silicon powder: 90kg, particle size 5mm.

[0112] (1) Dry-mix silicon carbide micropowder, carbon black, and naphthalene-based sulfonate, put them into a V-type mixer and mix them for 2 hours, and pour them into the kneader after mixing evenly; in addition, add water, yellow dextrin, poly Vinyl alcohol, stearic acid, and tetramethylammonium hydroxide were mixed and stirred evenly, then sprayed into the kneader, and stirred for 4 hours;

[0113] (2) Th...

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Abstract

The invention provides a preparation method of a silicon carbide ceramic heat-exchange tube and a product prepared by the method. The preparation method comprises the following steps: (1) uniformly mixing silicon carbide micro powder, carbon black and a water reducing agent, then adding a mixture consisting of water, a dispersing agent, a binder and a lubricant, and carrying out stirring; (2) carrying out pugging on the material obtained in the step (1) under a pressure of 1.0-1.5 MPa and a vacuum degree of -0.08 MPa to 0.1 MPa, repeating the process for 3-5 times until the water content is 15-30wt%; (3) carrying out aging on the material obtained in the step (2) and then carrying out forming treatment to obtain a heat-exchange tube biscuit; (4) raising the temperature of the heat-exchangetube biscuit treated by the step (3) to 60-80 DEG C, and carrying out heat preservation and drying; (5) uniformly spraying a sintering aid onto the surface of the heat-exchange tube biscuit treated by the step (4), carrying out heating to 600-1100 DEG C, then introducing protective gas, continuously carrying out heating to 1500-1700 DEG C, carrying out heat preservation, and then carrying out natural cooling to 25-200 DEG C. According to the invention, the sintering aids such as B4C, Y2O3 and the like are not required in the raw materials of the invention, so that the influence of free metalsilicon on the performance of silicon carbide ceramic is reduced, the strength of the biscuit is high, and the rate of finished products is improved.

Description

technical field [0001] The invention belongs to the field of preparation of engineering ceramics, and in particular relates to a method for preparing a silicon carbide ceramic heat exchange tube and a product obtained by the method. Background technique [0002] Metal materials have strong thermal conductivity, and the heat exchangers made of them have the advantages of high heat exchange efficiency and good processing performance. Therefore, metal heat exchange tubes, one of the important components of heat exchangers, are widely used in in the heat exchanger. However, ordinary metal materials have poor heat resistance and are easy to react with acid and alkali. Especially when the temperature is higher than 200 ° C, the metal heat exchange tube is prone to corrosion and there is obvious fouling, which seriously reduces the heat exchange efficiency of the heat exchanger. and longevity. Therefore, heat exchangers made of metal heat exchange tubes have strict requirements o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/626C04B35/632C04B35/634C04B35/636C04B35/64
CPCC04B35/565C04B35/62605C04B35/632C04B35/63404C04B35/636C04B35/64C04B2235/6562C04B2235/6567C04B2235/661C04B2235/77C04B2235/95C04B2235/9607
Inventor 王媛媛王志华王艺翔王世昌王法伦
Owner 潍坊六方碳化硅陶瓷有限公司
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