Preparation method of spherical nano-silica coated hexagonal boron nitride composite powder

A technology of spherical silica and hexagonal boron nitride, which is applied in the direction of lubricating compositions, petroleum industry, additives, etc., can solve the problems of inapplicability, achieve convenient operation, change electrical conductivity and thermal conductivity, and improve low-strength characteristics Effect

Active Publication Date: 2017-12-19
东营宝丰汽车配件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the carbon-coated hexagonal boron nitride obtained in patent CN102502535A is not suitable for ceramic-based and metal-based self-lubricating materials

Method used

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  • Preparation method of spherical nano-silica coated hexagonal boron nitride composite powder
  • Preparation method of spherical nano-silica coated hexagonal boron nitride composite powder
  • Preparation method of spherical nano-silica coated hexagonal boron nitride composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh 1 g of h-BN micron powder with a particle size of 10 μm and disperse it in 100 mL of absolute ethanol, ultrasonically disperse it for 10 min, add 4.5 mL of distilled water and 4 mL of ammonia water (pH value is about 8.5), and mix the obtained The solution was transferred into a three-necked flask, stirred magnetically and heated in a water bath until the temperature was 45°C;

[0029](2) Keeping the temperature at 45°C, add ethyl orthosilicate dropwise to the above mixed solution. The dropping method is as follows: divide 12mL of ethyl orthosilicate into 3 parts, and slowly add 4mL in 3 times within 1.5h tetraethyl orthosilicate; continue to react for 0.5h after the first dropwise addition, and then start to drop 4mL of tetraethylorthosilicate in the same way for the second time; after finishing the second dropwise addition, continue to react for 0.5h, Then start the third dropwise addition of 4mL tetraethyl orthosilicate in the same way; continue the reactio...

Embodiment 2

[0033] (1) Weigh 4 g of h-BN micron powder with a particle size of 10 μm and disperse it in 400 mL of absolute ethanol, ultrasonically disperse it for 20 minutes, add 18 mL of distilled water and 16 mL of ammonia water (pH value is about 8.5), and the obtained mixture Transfer to a three-necked flask, stir magnetically and heat in a water bath until the temperature is 30°C.

[0034] (2) Keeping the temperature at 30°C, add ethyl orthosilicate dropwise to the above mixed solution. The dropping method is: divide 36mL of ethyl orthosilicate into 3 parts, and add 12mL of orthosilicate dropwise within 1.5h ethyl ester; 0.5h later, add 12ml of tetraethyl orthosilicate dropwise for the second time in the same titration method; after completing the second drop of 0.5h, start the third dropwise addition; and so on, 36mL of tetraethyl orthosilicate total Slowly add dropwise to the mixture in 3 times, the total reaction time is 6h.

[0035] (3) After the reaction, the obtained suspensio...

Embodiment 3

[0037] (1) Weigh 2 g of h-BN micron powder with a particle size of 10 μm and disperse it in 200 mL of absolute ethanol, disperse it ultrasonically for 10 min, add 9 mL of distilled water and 12 mL of ammonia water (pH value is about 9), and dissolve the obtained mixture Transfer to a three-necked flask, magnetically stir and heat in a water bath at a heating temperature of 30°C.

[0038] (2) Keeping the temperature at 30°C, add tetraethyl orthosilicate dropwise to the above mixed solution. The dropping method is as follows: divide 24mL of tetraethyl orthosilicate into 6 parts, and add to the mixture obtained in step (1) every 4 hours. Slowly add 4mL tetraethyl orthosilicate dropwise into the solution, and the total reaction time is 24h. The specific operation is as follows:

[0039] Divide 24mL tetraethyl orthosilicate into 6 parts, each part of 4mL tetraethyl orthosilicate is added dropwise within 3h; continue to react for 1h after the first dropwise addition, and then add d...

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Abstract

The invention relates to a preparation method of spherical nanometer silica-coated hexagonal boron nitride composite powder. The method includes: dispersing the micron h-BN powder in absolute ethanol, adding distilled water and ammonia water, then adjusting the pH value to 9-12, keeping the temperature at 30-70°C, adding tetraethyl orthosilicate dropwise, and reacting to obtain a suspension. Turbid liquid; the suspension was centrifuged, washed with absolute ethanol, and dried under vacuum at 30-120°C to obtain a h-BN@SiO2 composite powder material with micron h-BN as the core and nano-SiO2 as the shell. The silicon dioxide-coated hexagonal boron nitride composite powder prepared by this method has a complete and dense coating layer, which is closely combined with the coated particles and has high bonding strength; it can be added to ceramic or metal matrix to improve material mechanics performance without reducing the friction properties of the material.

Description

technical field [0001] The invention relates to a preparation method of a spherical nano-silica-coated sheet-shaped micron hexagonal boron nitride composite powder, which belongs to the technical field of solid lubricant composite materials. Background technique [0002] Hexagonal boron nitride (h-BN) has a layered structure similar to graphite, has good lubricating properties, and is resistant to high temperature and chemical corrosion, and is widely used as a solid lubricant in high temperature environments. Introducing a solid lubricant into a ceramic or metal matrix to obtain a solid self-lubricating material can make the material itself have wear-reducing, wear-resistant and lubricating functions, eliminating the use of lubricating grease. However, it has been found that simply adding h-BN to the ceramic or metal matrix improves the friction properties of the material, but greatly reduces the mechanical properties of the material, which limits its application in some oc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M125/26C10M169/04C10M177/00C04B35/10
Inventor 许崇海陈辉肖光春陈照强衣明东马骏
Owner 东营宝丰汽车配件有限公司
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