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Author: Frischat, Günther Heinz × Author: Hauk, Rainer × End date: 1999 × Start date: 1990 ×

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    Sol-gel preparation of scratch-resistant AI₂O₃ coatings on float glass
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1999) Hauk, Rainer; Frischat, Günther Heinz; Ruppert, Karl
    Glass surfaces including those of automotive glazing show insufficient Scratch resistance. In order to improve this, a sol-gel process has been developed by means of which scratch-resistant and transparent corundum coatings (α-Αl₂O₃) may be deposited on glass surfaces. Coatings which were produced by using commercial boehmite(AlOOH) dispersions could also be completely transformed into α-Αl₂O₃, but they were not dense enough at about 500 nm thickness. Coatings produced by an alkoxide-gel process from aluminium butoxide were dense at a thickness of maximal 100 nm and adhered very well to the glass surface which had been slightly roughened by HF etching. Α Scratch test with a quartz grain showed that the damage of the glass surfaces coated in this way was less than 2 % compared to that of uncoated surfaces. Transmission of these coated glasses was about 90 % in the visible wavelength ränge.