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Composite abrasive grain in grain/alumina core-shell structure and preparation method and application of composite abrasive grain

A technology of composite abrasive grains and core-shell structure, applied in the field of abrasive processing, can solve the problems that abrasive grains cannot be applied to ceramic matrix, reduce the sharpness of abrasive grains, increase the complexity of the process, etc., and achieve controllable coating thickness and coating layer Uniform and dense, the effect of improving dispersion performance

Active Publication Date: 2012-10-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of preparation: the electroless plating method has the disadvantages of limited thickness of the coating, slow plating process, easy decomposition of the plating solution, and easy generation of free nickel.
The electroplating method is only suitable for metal powders, and a conductive film needs to be coated on the surface of non-metal powders, which increases the complexity of the process
From the point of view of use: the nickel layer or copper layer on the abrasive surface will inevitably reduce the sharpness of the abrasive grains, which limits its application in the field of grinding and polishing; in addition, the abrasive grains coated with nickel or copper layers on the surface cannot be applied to ceramics. Substrate, restricted field of application
[0004] So far, no report has been found to improve the bonding force between the matrix and the abrasive by coating the surface of abrasive grains (such as) diamond with alumina

Method used

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  • Composite abrasive grain in grain/alumina core-shell structure and preparation method and application of composite abrasive grain
  • Composite abrasive grain in grain/alumina core-shell structure and preparation method and application of composite abrasive grain
  • Composite abrasive grain in grain/alumina core-shell structure and preparation method and application of composite abrasive grain

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Soak 5 grams of 15-25 μm diamond in acid for 1.5 hours, wash with deionized water, dry and add to sodium hydrogen phosphate-sodium dihydrogen phosphate buffer to prepare a 15wt% aqueous solution, adjust the pH value to 6, and ultrasonically Disperse for 1h and heat to the reaction temperature of 70°C.

[0037] AlCl 3 Prepare 100 ml of a 0.15 mol / L solution, drop it into the diamond suspension, and stir vigorously with a magnetic stirrer at a stirring speed of 1000 rpm. During the reaction, sodium hydrogen phosphate or ammonia water was continuously added to keep the pH value of the system at 6.

[0038] Centrifuge the reactants and dissolve them in alcohol, ultrasonically disperse them, and then dry them at 120°C for 24 hours and heat them at 500°C for more than 1 hour to obtain diamond / alumina core-shell composite abrasive grains, which are weighed and coated with a Sartorius BS-224s precision balance The quality of the abrasive grains before and after is obtained by...

Embodiment 2

[0040] Soak 3 grams of 1-3 μm silicon carbide in acid for 1.5 hours, wash with deionized water, dry and add to hexamethylenetetramine-hydrochloric acid buffer to prepare a 15wt% aqueous solution, and adjust the pH value to 5.5. Ultrasonic dispersion for 1 h, heated to a reaction temperature of 65°C.

[0041] The coating precursor Al(NO 3 ) 3 Prepare 300 ml of a 0.2 mol / L solution, drop it into the diamond suspension, and stir vigorously with a magnetic stirrer at a stirring speed of 1200 rpm. During the reaction, hexamethylenetetramine or sodium hydroxide was continuously added to keep the pH value of the system at 5.5.

[0042] The reactant was centrifuged and dissolved in alcohol, ultrasonically dispersed, dried at 120°C for 24 hours, and heat-treated at 550°C for more than 1 hour to obtain silicon carbide / alumina core-shell structure composite abrasive grains, which were weighed by Sartorius BS-224s precision balance The quality of the abrasive grains before and after co...

Embodiment 3

[0044] Soak 8 grams of nanoscale diamond in acid for 1.5 hours, wash it with deionized water, add it directly to acetic acid-sodium acetate buffer solution to make a 15wt% aqueous solution, adjust the pH value to 5, disperse it ultrasonically for 1 hour, and heat to the reaction temperature 60°C.

[0045] AlCl 3Prepare 100 ml of a 0.15 mol / L solution, drop it into the diamond suspension, stir vigorously with a magnetic stirrer, and the stirring speed is 1500 rpm. During the reaction, sodium acetate or ammonia water was continuously added to keep the pH value of the system at 5.

[0046] The reactants were centrifuged and dissolved in alcohol, ultrasonically dispersed and then dried at 120°C for 4 hours to obtain composite abrasive grains with nano-diamond / alumina core-shell structure. Sartorius BS-224s precision balance was used to weigh the mass of the abrasive grains before and after coating. The quality of the coated alumina is 5% of that of the composite abrasive.

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Abstract

The invention discloses a composite abrasive grain in a grain / alumina core-shell structure and a preparation method and the application of the composite abrasive grain. An inner core of the composite abrasive grain is selected from diamond, carbide and the like serving as abrasive grains, and an outer shell of the composite abrasive grain is an alumina-coated layer. The preparation method includes: firstly, adding pretreated powder into buffer solution of a certain pH (potential of hydrogen) value, ultrasonically dispersing for 1h, and heating to 50-80 DEG C; secondly, preparing a coating precursor into 0.05-0.4mol / L solution, dripping the solution drop by drop into the buffer solution, violently stirring and keeping the pH value constant; and finally, separating reactants, drying for 24h at 120 DEG C, and performing heat treatment at 300-550 DEG C for more than one hour to obtain the composite abrasive grain in the grain / alumina core-shell structure. Holding power of an abrasive tool base to abrasive grains can be improved to effectively solve the problem of shedding of the abrasive grains, utilization rate of the abrasive grains is increased, the service life of an abrasive tool is prolonged, and uniformity in distribution of the abrasive grains can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of abrasive processing, and relates to a composite abrasive grain with an abrasive grain / alumina core-shell structure, a preparation method and an application thereof. Background technique [0002] With the vigorous development of optics, optoelectronics, digital products and IC industries, the demand for functional hard and brittle materials with various ultra-smooth surfaces is increasing. In the field of precision ultra-precision machining, chemical mechanical polishing technology is the most effective method to obtain an ultra-smooth and non-damaging surface. The traditional chemical mechanical polishing process uses free abrasives. This method has disadvantages such as low processing efficiency, high cost, serious pollution, and poor process controllability. The bonded abrasive chemical mechanical polishing effectively overcomes the above shortcomings and achieves planarization. The amount of material ...

Claims

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Application Information

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IPC IPC(8): C09K3/14
Inventor 朱永伟刘蕴锋李军唐晓骁李标付杰墨洪磊左敦稳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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