Method for manufacturing coloring ceramics via colloidal dispersion followed by conventional pressing techniques

摘要

A colored ceramic powder is produced from a mixture of coloring solutions consisting of metallic salts that are introduced to a ceramic slurry and subsequently dried. The coloring solution may comprise for example of chosen metallic salts, a solvent, an organic solvent such as derivatives of propylene oxides, an acid and a possible binder. Once all the constituents are thoroughly mixed to a homogeneous state, the slip is dried to a powder form, which spray drying equipment can be used. The dried powder can then be subjected to an isostatic or biaxial press manufacturing process to create a green state ceramic body. Once pressed, the ceramic body can be subjected to a sintering process. After final sinter, the resulting ceramic body possesses an innate color that is homogenous throughout its composition. The method is especially useful for coloring zirconia dental restorations.

主权项

1. A method of coloring a ceramic material product that is fabricated using a colloidal mixing process to form a ceramic slurry which can be combined with a binder, then dried, pressed and sintered; the method comprising the steps of:
a) forming a coloring solution consisting essentially of at least one metallic salt, a solvent, an organic solvent and an acid, the at least one metallic salt soluble in the solvent; b) choosing the relative constituents of the coloring solution to provide a selected color; c) choosing a relative amount of the coloring solution for an amount of a ceramic slurry to provide a selected color intensity; d) adding the coloring solution to the ceramic slurry; e) mixing the coloring solution and the ceramic slurry to homogeneously distribute the coloring solution throughout the ceramic slurry; and f) adding a binder of from 0.5% to 10% by weight of said coloring solution to a mixture of the coloring solution and the ceramic slurry.