Technique for plating TiO2/Al2O3 composite thin-film on cubic boron nitride surface by sol-gel method
A surface sol-gel and cubic boron nitride technology, which is applied in the field of cubic boron nitride abrasive surface modification, can solve the problems of weak bonding force between the film and cubic boron nitride matrix interface, and cubic boron nitride abrasive grain shedding. Achieve the effects of improving bonding strength, improving holding force, and good wettability
Inactive Publication Date: 2009-10-21
HUNAN UNIV
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Problems solved by technology
Although Al 2 o 3 The film can protect the cubic boron nitride abrasive from the erosion of the alkali metal oxide in the vitrified bond during the sintering process, and the wettability of the coated cubic boron nitride abrasive and the vitrified bond has been greatly improved, but al 2 o 3 The bonding force between the film and the cubic boron nitride substrate interface is weak, and the failure of the cubic boron nitride abrasive tool during use is manifested as the shedding of the cubic boron nitride abrasive grains
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[0015] Coating TiO on Cubic Boron Nitride Surface by Sol-Gel Method of the Present Invention 2 / Al 2 o 3 Composite thin film process, the process is:
[0016] First immerse the cubic boron nitride abrasive in hot nitric acid with a temperature of 80°C and a concentration of 85%, and activate the surface for 1 hour, then rinse the surface of the abrasive with clean water until the cleaning solution is neutral, and finally use Ultrasonic waves with a frequency of 80KHz, cleaning the abrasive surface in acetone medium for 1 hour;
[0017] Using butyl titanate as an organic precursor, mix butyl titanate and ethanol at a mass ratio of 4:1, stir at high speed (1000 rpm) for 3 hours, and then add 1 ml of water dropwise for every 50 ml of the mixed solution The proportion of distilled water was added, and then stirred at high speed for 1 hour, and the stable TiO was prepared by hydrolysis of butyl titanate 2 Sol, TiO 2 The sol was placed at room temperature for 24 hours and set a...
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The invention relates to a plating TiO2 / Al2O3 composite membrane technology by utilizing the cubic boron nitride surface sol-gel method, the steps are: the cubic boron nitride grinding medium is immerged into the hot nitric acid in a certain concentration for surface activation treatment for 1 hour or so, and then the surface of the grinding medium is washed to be neutral by water; the surface of the grinding medium is cleaned by the ultrasonic of a certain frequency in the acetone medium for about 1 hour; and then the cubic boron nitride grinding medium is soaked by TiO2 colloidal sol for about 3 minutes; after that, the cubic boron nitride grinding medium is roasted in the temperature of about 550 DEG C for 1 hour after being fished out and dried; which is cooled with the furnace, and then is soaked in Al2O3 colloidal sol, afterwards, which is fished out and dried; such step 3 is repeated for two times; after being dried, the grinding medium is roasted in the temperature of 800 DEG C or so for about 1 hour; and then is cooled along with the furnace, finally the cubic boron nitride grinding medium covering the composite membrane can be generated. When the abrasive wheel of ceramic bonding agent is prepared by the plating cubic boron nitride grinding medium, the grinding medium has a nice wetting property with the ceramic bonding agent, thereby the life time of ceramic grinding tool can be increased significantly.
Description
technical field [0001] The invention relates to a technology for modifying the surface of cubic boron nitride abrasives, especially capable of firmly and uniformly coating a layer of TiO on the surface of cubic boron nitride 2 / Al 2 o 3 Ceramic composite film. Background technique [0002] At present, the commercial cubic boron nitride abrasive surface modification technology uses electroplating to coat a layer of metal on the surface of the abrasive. The most common metal coatings are Ti, Ni, Cr, etc., but the application of cubic boron nitride with metal coating When preparing ceramic abrasive tools, the wettability of the metal coating and the vitrified bond is not good, and the durability of the abrasive tools is poor. Therefore, in order to improve the wettability of the cubic boron nitride abrasive and vitrified bond, a ceramic coating can be coated on the surface of the abrasive. The existing coating methods include vapor coating, sol-gel coating and physical vapor...
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IPC IPC(8): C04B41/50C04B41/87C04B35/5831
Inventor 刘小磐
Owner HUNAN UNIV