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
CN102719220AActive Publication Date: 2012-10-10NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Publication Date
2012-10-10

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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