A ceramic coating slurry and its preparation method, a ceramic coating and its preparation method, and a spherical annular seal and its preparation method

A technology of ceramic coating and slurry, which is applied in coatings, engine seals, mechanical equipment, etc., can solve the problems of ceramic coating curling and cracking, achieve uniform volatilization rate and improve plasticity

Active Publication Date: 2017-09-29
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem of curling and cracking of the ceramic coating of the existing spherical annular seal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] According to the preparation method provided by the present invention, specifically, add ceramic powder, lubricant and organic solvent into the mixing tank, and add organic dispersant, add plasticizer and binder after rolling for 6-10h, and continue Tumbling for 10-15 hours to make a ceramic coating slurry.

[0029] The present invention also provides a method for preparing a ceramic coating, the method comprising coating a ceramic coating slurry on the surface of a base material, and then drying to obtain a ceramic coating; the ceramic coating slurry is prepared by the present invention The ceramic coating slurry described above.

[0030] According to the preparation method provided by the present invention, preferably, the drying temperature is 50-80°C.

[0031] The present invention also provides a ceramic coating prepared by the above method.

[0032] The present invention also provides a method for preparing a spherical annular seal, the method comprising the fol...

Embodiment 1

[0043] The specific gravity of the components of the above ceramic slurry is as follows: 40g of boron nitride (BN, with an average particle size of 2μm), 50g of polytetrafluoroethylene micropowder (PTFE, with an average particle size of 2μm), alumina (Al 2 o 3 , with an average particle size of 2 μm) 6 g, silicon oxide (SiO 2 , average particle size of 2 μm) 6 g, ethanol: 150 g, xylene 50 g, triolein (dispersant) 4 g, polyethylene glycol (plasticizer) 2.5 g, dibutyl phthalate (plasticizer) 2.5 g, polyvinyl butyral (binder) 8 g (including 2 g B30, 6 g B60).

[0044] The production process is as follows: ①Add weighed BN, PTFE micropowder, aluminum oxide, silicon oxide, ethanol, xylene and glyceryl trioleate into the mixing tank, add polyethylene glycol, o-phthalic acid after rolling for 8 hours Dibutyl diformate and PVB (B30, B60), and continue to grind for 12 hours to make the ceramic slurry; ② Pour the slurry into the scraper hopper, and flow into the lower graphite coil bas...

Embodiment 2

[0046] The specific gravity of the components of the above ceramic slurry is as follows: 55 g of boron nitride (BN, with an average particle size of 1 μm), 40 g of polytetrafluoroethylene micropowder (PTFE, with an average particle size of 1 μm), alumina (Al 2 o 3 , with an average particle size of 1 μm) 3 g, silicon oxide (SiO 2 , the average particle size is 1μm) 10 g, ethanol: 180 g, xylene 60 g, phosphate ester (dispersant) 2 g, polyethylene glycol (plasticizer) 2.5 g, dibutyl phthalate (plasticizer) ) 2 g, polyvinyl butyral (binder) 8 g (including 2 g B30, 6 g B60).

[0047] The production process is as follows: ①Add weighed BN, PTFE micropowder, alumina, silicon oxide, ethanol, xylene and phosphate ester into the mixing tank, add polyethylene glycol and phthalic acid after rolling for 8 hours Dibutyl ester and PVB (B30, B60), and continue to grind for 12 hours to make the ceramic slurry; ② Pour the slurry into the scraper hopper, and flow into the lower graphite coil b...

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Abstract

The invention provides ceramic coating slurry and a preparation method therefor, a ceramic coating and a preparation method therefor, and a ball ring-shaped sealing element and a preparation method therefor. The ceramic coating slurry provided by the invention comprises ceramic powder, a lubricant, organic solvents, an organic dispersant, a binder and a plasticiser; the ceramic powder comprises boron nitride, aluminium oxide and silicon dioxide; and the organic solvents comprise a first organic solvent and a second organic solvent, wherein the first organic solvent and the second organic solvent are mixed to form an azeotropic solvent. The ceramic coating provided by the invention solves the problem that a total coating in a manufacturing process is cracked, and the added organic components have no effect on coating airtightness of the prepared sealing element products.

Description

technical field [0001] The invention belongs to the field of automobiles, and in particular relates to a ceramic coating slurry and a preparation method thereof, a ceramic coating and a preparation method thereof, a spherical annular seal and a preparation method thereof. Background technique [0002] Most of the spherical ring seals used in automobile exhaust pipes are made of heat-resistant graphite, and there is a large difference between the static friction coefficient and dynamic friction coefficient of graphite, resulting in abnormal noise at the joint. Therefore, it is necessary to coat the surface of the seal with a heat-resistant and lubricated ceramic coating to solve this problem. At present, BN (boron nitride), PTFE (polytetrafluoroethylene), Al 2 o 3 (alumina), SiO 2 (Silicon dioxide) mixed ceramic coating material, using water as a solvent, mixing the above powder into a water-based slurry, coating it on the surface of a flexible graphite coil with a roller, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00C09D7/12F16J15/10
Inventor 徐强邵长健林信平张伟锋
Owner BYD CO LTD
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