A method of preparing a reactive-sintered silicon carbide ceramic product

A technology for sintering silicon carbide and ceramic products, which is applied in the field of inorganic non-metallic materials, can solve the problems of small product thickness and difficult-to-form products, and achieve the effects of improved drying efficiency, small equipment and short preparation time

Inactive Publication Date: 2017-07-04
NINGBO VULCAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extrusion molding process usually requires the use of a vacuum mud refining device to prepare better quality mud, and extrusion molding is difficult to form products with complex shapes, and the thickness of the extruded product is small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Stir and mix 98wt% silicon carbide, 2wt% graphite powder, 1.2wt% sodium hexametaphosphate, 10wt% phenolic resin, and 35wt% deionized water for 24 hours to obtain a grouting slurry.

[0019] (2) The high-pressure grouting slurry prepared above is sucked into the storage tank of the high-pressure grouting machine through the suction pipe, and the grouting is performed through the high-pressure grouting machine. The grouting molding pressure increases from 0.1MPa to 4MPa within 50s. Then hold the pressure for 100s under a high pressure of 4MPa, release the pressure, open the mold and demould to obtain a green product. The median diameter of the resin pores of the porous resin mold is 25 μm.

[0020] (3) Put the green body product in an oven, dry it at 50°C for 12 hours, then raise the temperature to 90°C and dry it for 2 hours to obtain a dry body product.

[0021] (4) After the dry product is dewaxed in a dewaxing furnace, it is buried in silicon and sintered. It is k...

Embodiment 2

[0023] (1) Stir and mix 55wt% silicon carbide, 20wt% graphite powder, 25wt% carbon black powder, 1.2wt% sodium hexametaphosphate, 0.6wt% carboxymethyl cellulose, and 50wt% deionized water for 24 hours to obtain grouting slurry.

[0024] (2) The high-pressure grouting slurry prepared above is sucked into the storage tank of the high-pressure grouting machine through the suction pipe, and the grouting is performed through the high-pressure grouting machine. The grouting molding pressure increases from 0.1MPa to 4MPa within 50s. Then hold the pressure for 200s under a high pressure of 4 MPa, release the pressure, open the mold and demold to obtain a green product. The median diameter of the resin pores of the porous resin mold is 25 μm.

[0025] (3) Put the green body product in an oven, dry it at 50°C for 12 hours, then raise the temperature to 90°C and dry it for 2 hours to obtain a dry body product.

[0026] (4) After the dry product is dewaxed in a dewaxing furnace, it is bu...

Embodiment 3

[0028] (1) Stir and mix 75wt% silicon carbide, 25wt% graphite powder, 1.2wt% sodium hexametaphosphate, 0.6wt% carboxymethyl cellulose, and 40wt% deionized water for 24 hours to obtain a grouting slurry.

[0029] (2) The high-pressure grouting slurry prepared above is sucked into the storage tank of the high-pressure grouting machine through the suction pipe, and the grouting is performed through the high-pressure grouting machine. The grouting molding pressure increases from 0.1MPa to 4MPa within 50s. Then hold the pressure for 100s under a high pressure of 4MPa, release the pressure, open the mold and demould to obtain a green product. The median diameter of the resin pores of the porous resin mold is 25 μm.

[0030] (3) Put the green body product in an oven, dry it at 50°C for 12 hours, then raise the temperature to 90°C and dry it for 2 hours to obtain a dry body product.

[0031] (4) After the dry product is dewaxed in a dewaxing furnace, it is buried in silicon and sinter...

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Abstract

A method of preparing a reactive-sintered silicon carbide ceramic product is disclosed. The method includes (1) a step of preparing slurry, namely a step of adding slurry materials into a material mixing slurry preparing device, and fully stirring the slurry materials to prepare grouting slurry; (2) a step of injecting the slurry to a porous resin mold, and molding to obtain a green body; (3) a step of putting the green body into a drying oven to obtain a dried green body; and (4) a step of subjecting the dried green body to siliconizing reactive sintering in a high-temperature vacuum sintering furnace, performing siliconizing under vacuum conditions with the highest temperature being 1350-1750 DEG C, maintaining the temperature for 0.5-5 h, and cooling a product to obtain a finished product. According to the method, the occupied space of devices in the method is low, the production efficiency is high, automatic production can be achieved, the molded product has advantages of high density, good uniformity, and the like, raw materials are nontoxic, the drying efficiency is high, the production cycle is short, a cost is greatly reduced, product uniformity is better, produced products are more diversified, and the method can achieve production of large-size special-shape complex products.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and mainly relates to a ceramic colloidal pressure forming technology, in particular to a preparation method of a reaction-sintered silicon carbide ceramic product by high-pressure grouting. Background technique [0002] Reaction sintered silicon carbide ceramics is a silicon / silicon carbide composite material prepared by the reaction of molten silicon and carbon-containing / silicon carbide blanks at high temperatures. This method has no dimensional changes during the sintering process and has obvious advantages for the preparation of large-scale and complex-shaped products. . [0003] Reaction sintered silicon carbide ceramics have excellent wear resistance, high strength, good toughness, corrosion resistance and good oxidation resistance, and are widely used in technical fields such as mechanical seals, chemicals, energy and military industries. [0004] At present, the molding m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/573
CPCC04B35/573C04B2235/425C04B2235/447C04B2235/48C04B2235/6022C04B2235/606C04B2235/656C04B2235/6567C04B2235/77C04B2235/96
Inventor 邬国平熊礼俊谢方民于明亮
Owner NINGBO VULCAN TECH CO LTD
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