Silicon carbide surface modifying method

A surface modification and silicon carbide technology, which is applied in the treatment of dyed low-molecular organic compounds, fibrous fillers, etc., can solve the problems of pollution, easy to fall off, easy to settle on the surface of silicon carbide, etc. High, good water absorption performance

Inactive Publication Date: 2003-05-14
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because it is bonded to the surface of silicon carbide, it is easy to fall off. In addition, the residue after the corrosion of inorganic substances is easy to settle on the surface of silicon carbide, causing pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Take refined 100g of acrylamide aqueous solution with a concentration of 25% by weight in a beaker, add 0.025g of methylenebisacrylamide crosslinking agent, stir and dissolve, adjust the pH value to 8, then add 0.025g of potassium metabisulfite and 0.05 g of potassium persulfate was stirred to dissolve. The precisely weighed silicon carbide (its surface was treated with acetone in advance) was immersed in the above mixed solution, and after taking it out, it carried out graft copolymerization in an oven at 50°C for 3 hours to obtain a graft rate of 10.5%, and a water absorption rate of 12.3g / g of modified silicon carbide.

Embodiment 2

[0010] Take 100g of refined acrylamide aqueous solution with a concentration of 10% by weight in a beaker, add 0.08g of glycidyl acrylate crosslinking agent, stir and dissolve, adjust the pH value to 7, then add 0.1g of sodium metabisulfite and 0.05g of ammonium persulfate Stir to dissolve. Immerse the precisely weighed silicon carbide (treat its surface with chloroform in advance) in the above mixed solution, take it out and carry out graft copolymerization in an oven at 20°C for 2 hours to obtain a graft rate of 0.8% and a water absorption rate of 2.8g / g of modified silicon carbide.

Embodiment 3

[0012] Take 100g of refined 50% acrylamide aqueous solution in a beaker, add 0.005g of epichlorohydrin crosslinking agent, stir and dissolve, adjust the pH value to 9, then add 0.015g of sodium bisulfite (or sodium sulfite) Stir and dissolve with 0.03g ammonium persulfate. Immerse the precisely weighed silicon carbide (treat the surface with dioxane in advance) in the above mixed solution, take it out and carry out graft copolymerization in an oven at 40°C for 3 hours to obtain a grafting rate of 1.2%, and a water absorption rate of 3.1 g / g of modified silicon carbide.

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Abstract

The silicon carbide surface modifying process via organic matter grafting copolymerization includes purifying acrylamide, compounding water solution of acrylamide, dissolving acrosslinking agent, regulating pH value, dipping silicon carbide after being processed with organic solvent in the mixed solution, taking out the dipped silicon carbide, grafting and copolymerizing in oven at controlled temperature, hydrolyzing and stoving to obtain modified silicon carbide material with water absorbing and dust adsorbing surface and with relatively long effective period.

Description

technical field [0001] The invention belongs to a surface modification method of silicon carbide, in particular to a graft copolymerization method to improve the surface of silicon carbide and solve the problem that the surface is rich in water absorption. Background technique [0002] It is well known that silicon carbide ceramics have high hardness, excellent high temperature strength, wear resistance, chemical corrosion resistance and thermal shock resistance. As a high-temperature wear-resistant structural material, it has been widely used, such as various mechanical seals and high-temperature structural parts. It is also considered to be the most promising material for the future manufacturing of gas turbines, rocket nozzles and engine components in the aerospace and automotive industries. one. However, since SiC is a particularly hydrophobic and hard material, its surface cannot absorb moisture. To make special-purpose functional materials, such as making use of its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C09C1/28C09C3/08
Inventor 谭颍李志强郭永利车吉泰张志成潘振远
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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