An improved gear micropump for delivering corrosive materials, particularly photographic materials, such as dyes and emulsions, has a pair of intermeshing gears rotatably mounted on zirconia ceramic shafts. The ceramic shafts of the invention may be formed from zirconia and zirconia composite materials. The gear micropump having the zirconia ceramic shafts eliminates pulsation during fluid delivery and is resistant to wear and abrasion. Moreover the zirconia ceramic shafts are strongly resistant to chemicals like photographic emulsions and dyes and, therefore, do not contaminate product with corrosive materials.
This invention relates to zirconia and zirconia composite ceramic shafts and a method of making same. The invention particularly concerns such ceramic shafts for gear micropumps useful generally for pumping a variety of corrosive materials including acids and bases as well as photographic emulsions and dyes in the manufacture of photographic films and papers. The tough, durable, wear and corrosion resistant zirconia ceramic shafts improves the pumping efficiency by eliminating pulsation during web coating and also extends the service life.
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