Process for making chemically bonded composite hydroxide ceramics
AssigneeThe University of British Columbia
InventorsTomasz Troczynski, Quanzu Yang
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Abstract
This invention relates to novel process of preparing chemically bonded composite hydroxide ceramics by exposing a thermally treated hydroxide ceramic to phosphate reagent and subsequent heat treating the resulting system to initiate a rapid chemical bonding reaction. Such combined hydroxide/chemical bonding process can be used to fabricate ceramics or ceramic coatings for a variety of high and low temperature applications, including corrosion protection, wear resistance, dielectric properties, metal reinforced ceramics, ceramic membranes, non-sticky surfaces, bio-active ceramics, thermal barrier ceramics, non-wetted surfaces, and others.
Claims15
A process of preparing a chemically bonded ceramic comprising:
- (a) as a first step, preparing a slurry of solvent and hydroxide ceramic;
- (b) as a second step, heat treating the hydroxide ceramic slurry at a temperature of between about 100 to 800° C. to produce a dehydrated oxide ceramic;
- (c) as a third step, impregnating the dehydrated oxide ceramic with a phosphating agent;
- and
- (d) as a fourth step, heat treating the phosphate impregnated oxide ceramic at a temperature between about 200° C. and about 1200° C. to seal pores in the ceramic and produce a phosphated oxide ceramic.
A process as claimed in 6 wherein the metal in the phosphate can be one or more of Al, Zr, Ti, Mg, Cu, Fe, Ca, Sr, Hf or Cr, Ba, Mo, Ni, Zn, Pb or Sn.
Dependencies are inferred from the claim text.