Aluminum oxide coated nano flaky hexagonal boron nitride composite powder as well as preparation method and application thereof

A technology of hexagonal boron nitride and nano flakes, which is applied in the field of preparation of alumina-coated nano flake hexagonal boron nitride composite powder, which can solve the problems of inability to observe the reaction process intuitively, high equipment requirements, and technical difficulties. problems, to achieve the effect of improving mechanical properties and friction and wear properties, low equipment requirements, and simple process

Active Publication Date: 2020-08-18
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inventors found that this method has some disadvantages: the hydrothermal hydrogen reduction method needs to be carried out in a closed container, ...

Method used

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  • Aluminum oxide coated nano flaky hexagonal boron nitride composite powder as well as preparation method and application thereof
  • Aluminum oxide coated nano flaky hexagonal boron nitride composite powder as well as preparation method and application thereof
  • Aluminum oxide coated nano flaky hexagonal boron nitride composite powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Weigh 0.2g of h-BN powder with a particle size of 100nm, pickle in HF solution for 20min, centrifuge at 4000r / min for 5min, and then wash with absolute ethanol. The powder after pickling was dispersed in 100mL of absolute ethanol, an appropriate amount of dispersant PVP was added, ultrasonically dispersed for 30min, and then 50mL of distilled water was added to continue ultrasonically stirring for 10min.

[0042] (2) Add 30g / L aluminum nitrate solution (Al(NO 3 ) 3 9H 2 O), ultrasonically stirred for 10min. The obtained mixed solution was placed in a magnetic stirrer, heated and stirred in a water bath, and the temperature was kept at 75°C. At the same time, sodium acetate buffer solution of acetic acid was added to control the pH value to 4.5.

[0043] (3) Slowly add dilute ammonia water to the above mixed solution to adjust the pH to 7.5 at a rate of 0.15 mL / min. After the dropwise addition was completed, the mixture was incubated for 30 minutes, and then all...

Embodiment 3

[0051] (1) Weigh 0.05g of h-BN powder with a particle size of 100nm, pickle it in HF solution for 20min, centrifuge it at 5000r / min for 5min, and wash it with absolute ethanol. The powder after pickling was dispersed in 100mL of absolute ethanol, an appropriate amount of dispersant PVP was added, ultrasonically dispersed for 20min, and then 50mL of distilled water was added to continue ultrasonically stirring for 20min.

[0052] (2) Add 7.5g / L aluminum nitrate solution (Al(NO 3 ) 3 9H 2 O), ultrasonically stirred for 30min. The obtained mixed solution was placed in a magnetic stirrer, heated and stirred in a water bath, and the temperature was kept at 60°C. At the same time, acetic acid sodium acetate buffer solution was added to control the pH value to 6.

[0053] (3) Slowly add dilute ammonia water to the above mixed solution to adjust the pH to 8.5 at a rate of 0.15 mL / min. After the dropwise addition was completed, it was incubated for 30 minutes, and then allowed to ...

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Abstract

The invention relates to aluminum oxide coated nano flaky hexagonal boron nitride composite powder as well as a preparation method and application thereof, and belongs to the field of nano solid lubricant surface-modified coated composite materials. The preparation method comprises the steps: dispersing nano h-BN powder subjected to acid pickling into absolute ethyl alcohol, and adding a proper amount of dispersing agent PVP and distilled water; after carrying out ultrasonic stirring for a period of time, pouring an aluminum nitrate nonahydrate solution into the solution, and then adding a sodium acetate buffer solution to control the pH value to be 4.5; heating and stirring a suspension in a magnetic stirrer, keeping the temperature at 75 DEG C, slowly dropwise adding dilute ammonia water, and keeping the temperature for 30 min; centrifuging the suspension after the reaction, and cleaning with absolute ethyl alcohol; and carrying out vacuum drying at the temperature of 60-110 DEG C toobtain h-BN@Al(OH)3 composite powder taking nano h-BN as a core and Al(OH)3 as a shell; and calcining the powder at the temperature of 850 DEG C to obtain the CaF2@Al2O3. According to the aluminum oxide coated nano hexagonal boron nitride composite powder prepared by the method, a coating layer is compact and uniform. When the composite powder is added into a metal or ceramic matrix, the mechanical property of the material can be improved, and the lubricating property of the material is not reduced.

Description

technical field [0001] The invention relates to a method for preparing aluminum oxide-coated nano-flaky hexagonal boron nitride composite powder, and belongs to the technical field of nano-solid lubricant surface modification coating composite materials. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily to be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The research progress of nanomaterials undoubtedly promotes the development and progress of society. Nanomaterials have a large specific surface area, a sharp increase in the number of atoms on the surface and surface tension, and have obvious small size effects, surface effects, quantum size effects, and macroscopic tunnel effects. Therefore, compared with macrosco...

Claims

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Application Information

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IPC IPC(8): C01F7/44C01F7/34C01B21/064B82Y40/00C10M125/00C10M125/10C10M125/20C10N30/06
CPCC01F7/441C01F7/34C01B21/0648B82Y40/00C10M125/00C10M125/10C10M125/20C01P2004/80C10M2201/062C10M2201/061Y02T10/86
Inventor 陈照强季良刚许崇海肖光春衣明东张静婕
Owner QILU UNIV OF TECH
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