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Silicon carbide slurry preparation method applied to free direct writing forming technology

A technology of silicon carbide slurry and direct writing forming, applied in the field of materials

Active Publication Date: 2020-11-03
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no patent related to SiC slurry applied to direct writing forming technology, and there is no SiC porous ceramic product prepared by direct writing forming technology on the market.

Method used

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  • Silicon carbide slurry preparation method applied to free direct writing forming technology
  • Silicon carbide slurry preparation method applied to free direct writing forming technology
  • Silicon carbide slurry preparation method applied to free direct writing forming technology

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preparation example Construction

[0052] The stirrer used in the preparation process of the suspension in the embodiment of the present invention is the JB300-SH digital display constant speed powerful stirrer of Shanghai Hengping Company.

[0053] The equipment used in the sintering process in the embodiment of the present invention is a vacuum high-temperature sintering furnace.

[0054] The equipment used for the Zeta potential test in the embodiment of the present invention is a Zeta potential meter from Bedford Hills Company.

[0055] The equipment used in the rheological performance test in the embodiment of the present invention is a rotational rheometer from TA Company, and the equipment model is DHR-2.

[0056] The equipment used in the scanning electron microscope pictures provided by the implementation of the present invention is Hitachi ScanningElectron Microscope, and the equipment model is s4800.

Embodiment 1

[0058] 292gSiC, 4gB 4 C (as a sintering aid) and 4g nano carbon black (CB) (as a sintering aid) (the mass of the sintering aid accounts for 2.7% of the total mass of the powder) powder into a polytetrafluoroethylene ball mill jar, and add 40 SiC balls with a diameter of 2mm and 400ml alcohol. Ball milled at 200rpm for 24h to prepare SiC, B 4 C and CB mixed powder. Pass the mixed powder through a 400 sieve and dry at 90°C for 24 hours. Grind the dried powder with a mortar, and pass through a 400-mesh sieve again.

[0059] In this example, the Zeta potential diagrams of silicon carbide and two kinds of sintering aid raw powders, and the Zeta potential diagrams after surface modification of the three powders with the help of dispersants are as follows figure 1 shown.

[0060] The mixed powder after sieving is slowly added to the solution containing 2.8g polyethyleneimine (PEI, M.W.=75000) dispersant (accounting for 0.93% of the total powder mass) and 80g deionized water, sti...

Embodiment 2

[0065] 292gSiC, 4gB 4 C (sintering aid) and 4g of nano-carbon black (sintering aid) powder were put into a polytetrafluoroethylene ball mill jar, and 40 SiC balls with a diameter of 2mm and 400ml of alcohol were added. Ball milled at 200rpm for 24h to prepare SiC, B 4 C and CB mixed powder. Pass the mixed powder through a 400 sieve and dry at 90°C for 24 hours. Grind the dried powder with a mortar, and pass through a 400-mesh sieve again.

[0066] Slowly add the sieved mixed powder into a solution containing 3.5g polyethyleneimine (PEI, M.W.=75000) dispersant (accounting for 1.2% of the total powder mass) and 82g deionized water, and stir while adding, Further, a ceramic slurry with a high solid content (52.9 vol%) was prepared.

[0067] Add a 2 mol / L aqueous sodium hydroxide solution to the ceramic slurry until pH = 9, and stir for 2 h. Then continue to add methyl cellulose as a thickener to obtain an adjusted slurry, and adjust the mass ratio of methyl cellulose in the ...

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Abstract

The invention relates to a preparation method of silicon carbide slurry applied to a free direct writing forming technology, which belongs to the technical field of materials. The method comprises thefollowing steps: (1) uniformly mixing SiC powder with a sintering aid through ball milling; (2) drying the suspension obtained after ball milling in a constant-temperature oven, and grinding and sieving the suspension; (3) pouring the sieved powder into an aqueous solution in which a dispersing agent is dissolved to prepare a sol-state ceramic suspension, and stirring the mixture at a high speed;(4) adjusting the pH value, adding a thickening agent, and stirring the mixture; and (5) carrying out ball milling on the stirred slurry to prepare the SiC ceramic slurry applied to free direct writing. The method is simple in step and relatively low in equipment requirement; the prepared slurry can meet the rheological property requirement of free direct writing forming on the slurry, and various porous SiC ceramic products with complex shapes can be produced.

Description

Technical field: [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing silicon carbide slurry applied to free direct writing forming technology. Background technique: [0002] Silicon carbide (SiC) ceramics have excellent characteristics such as high strength, high hardness, good thermal stability, small thermal expansion coefficient, high thermal conductivity, wear resistance, thermal shock resistance and chemical corrosion resistance, and are widely used in petrochemical, aerospace , microelectronics, steel, automobiles and other fields, and have been widely valued by people. The increasing demand for SiC materials has driven extensive research into their fabrication and performance relationships. At present, the molding methods of SiC ceramics mainly include dry pressing molding, grouting molding, gel injection molding and direct solidification molding. Although the related molding process is quite mature, ...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/565C04B35/624C04B35/64B28B1/00B28B1/24B33Y10/00B33Y70/10
CPCC04B38/00C04B35/565C04B35/624C04B35/64B28B1/24B28B1/001B33Y70/10B33Y10/00C04B2235/3821C04B2235/3873C04B2235/424C04B2235/3208C04B2235/3217C04B2235/3225C04B2235/3244
Inventor 茹红强孙是昊
Owner NORTHEASTERN UNIV
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