Transparent non-vitreous zirconia microspheres

Details Transparent non-vitreous zirconia microspheres Transparent non-vitreous zirconia microspheres

C - Chemistry, Metallurgy

03

C

94/13, 240/150,

C03C 12/02 (2006.01) C01G 25/02 (2006.01) C04B 35/48 (2006.01) C04B 35/624 (2006.01) G02B 5/128 (2006.01)

Patent

CA 1262557

TRANSPARENT NON-VITREOUS ZIRCONIA MICROSPHERES Abstract of the Disclosure Solid, transparent, non-vitreous, zirconia and zirconia-silica ceramic microspheres, useful as lens elements in retroreflective pavement markings. The microspheres are characterized by: (a) containing at least one additive metal oxide selected from alumina, magnesia, yttria and mixtures thereof; (b) an index of refraction greater than 1.6; and (c) being virtually free of cracks. These microspheres are formed by a sol-gel technique of extractive gelation (extracting carboxylic acid away from zirconyl carboxylate) of a sol in liquid medium such as hot peanut oil. The microspheres of this ceramic composition have been made with relatively large diameters, (e.g. 200-1000 micrometers) making them quite useful as lens elements in pavement marking sheet materials.

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