Colloidal forming process method for preparing silicon nitride bonded silicon carbide composite ceramic

A composite ceramic and colloidal molding technology, applied in the field of engineering ceramics, achieves the effects of easy control, simple operation process and reduced production cost

Inactive Publication Date: 2011-04-13
BEIFANG UNIV OF NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the colloidal molding process, the gel properties of natural polymers are used to realize the in-situ forming of large-sized and complex-shaped components of silicon nitride-silicon carbide composite powder materials, which not only has wide adaptability to powders of different particle sizes, At the same time, it is non-toxic and environmentally friendly, and has not yet been reported

Method used

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  • Colloidal forming process method for preparing silicon nitride bonded silicon carbide composite ceramic
  • Colloidal forming process method for preparing silicon nitride bonded silicon carbide composite ceramic
  • Colloidal forming process method for preparing silicon nitride bonded silicon carbide composite ceramic

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Experimental program
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Effect test

Embodiment 1

[0031] 1~8wt% concentration agar deionized aqueous solution (relative solid powder 1wt%), 80.5wt% silicon carbide powder, 15wt% silicon powder, 4wt% aluminum oxide, 0.5wt% ferric oxide and 0.1wt% ammonium citrate (relative Add deionized water to solid powder, mix and ball mill for 24 hours to form a uniform slurry; heat and stir in a deionized water bath at 80°C to fully dissolve the agar in the slurry, vacuumize and remove bubbles for 10 minutes, and pour into a beaker This process is assisted by ultrasonic treatment; inject the hot slurry into the cold mold, place it at room temperature, and obtain a cured wet billet after demoulding, dry in the shade for 24 hours, put it in an oven to heat and dry, and get the required Shape and size of the body. figure 1 is the strength of dry bodies containing different concentrations of agar gel.

Embodiment 2

[0033] 9 wt% agar deionized aqueous solution (2 wt% relative to solid powder) was added into deionized water and heated to dissolve at 45°C for use. 77.2wt% silicon carbide powder, 17.5wt% silicon powder, 0.3wt% ferric oxide, 4wt% aluminum oxide, 1wt% yttrium oxide, deionized water and 1wt% ammonium citrate (relative to solid powder) after 12 hours Ball milling, heating and stirring with the prepared agar solution, vacuumize and remove foam to form a uniform slurry; vacuumize and remove foam at 60°C, inject the slurry into molds, cool and solidify for 20 minutes, then demould, dry in the shade, and bake Dry to obtain a green body of the desired shape and size. figure 1 is the strength of dry bodies containing different concentrations of agar gel.

Embodiment 3

[0035] Add the gelatin deionized aqueous solution with a concentration of 3wt-9wt% (3wt% relative to the solid powder) into deionized water and heat to dissolve at 50°C for use. 82.5wt% silicon carbide powder, 15.5wt% silicon powder, 2wt% yttrium oxide, deionized water and 0.5wt% ammonium citrate (relative to solid powder) were ball milled for 12 hours, heated and stirred with the prepared gelatin solution , vacuumize at 40°C to remove foam to form a uniform slurry; inject the slurry into a mold, cool and solidify for 30 minutes, then demould, dry in the shade, and dry to obtain a green body of the desired shape and size. figure 2 is the strength of dry bodies containing different concentrations of gelatin gel.

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Abstract

The invention belongs to the technical field of engineering ceramics and relates to a colloidal forming process method for preparing silicon nitride bonded silicon carbide composite ceramic. The colloidal forming process method comprises the following steps: a, adding silicon powder, silicon carbide powder, sintering additive, natural polymer and dispersing agent into deionized water, mixing the materials, and performing mixed ball milling to obtain a mixture slurry; b, in a heating state, defoaming the mixed slurry in vacuum and reinforcing the defoaming by auxiliary ultrasonic vibration; and c, injecting into a mould for curing and forming, drying for 1-3 days in a gloomy and cold environment, drying in an oven and demoulding to obtain a ceramic biscuit component which has the advantages of relatively high strength and smooth appearance. The invention has the advantages that the formed product has high density and is environmentally friendly, the working efficiency is greatly improved, the process operation is simple, the cost is low and the method is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of engineering ceramics, and relates to a colloidal molding process method for preparing silicon nitride-bonded silicon carbide composite ceramics. Background technique [0002] Silicon nitride combined with silicon carbide ceramic materials usually use synthetic SiC particles to add silicon powder, and pass N at high temperature. 2 Gas, press 2N 2 +3Si→Si 3 N 4 Reaction, closely combined with SiC particles, this material is better than traditional silicon carbide materials in terms of chemical corrosion resistance, physical properties, mechanical strength and wear resistance; at the same time, the thermal conductivity of high temperature performance is also good, so it is obtained Wide range of applications, such as high temperature lining in the metallurgical industry, aluminum electrolytic cells in the non-ferrous industry, burner nozzles in the chemical industry, and kiln furniture for various industr...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/624C04B35/622
Inventor 耿桂宏罗绍华
Owner BEIFANG UNIV OF NATITIES
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