Colloidal Coloring of Zirconia Ceramic Slurry
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Solution Overview
Problem
Current methods for coloring ceramics result in inhomogeneous surface and internal coloration due to reliance on post-fabrication dipping processes, which are influenced by the properties of the coloring solution, leading to inconsistent results and lack of innate coloration.
Innovation Solution
Introducing a coloring solution comprising metallic salts, an organic solvent, and an acid into the ceramic slurry during the slip casting process, ensuring homogeneous mixing and subsequent sintering to achieve a uniformly colored ceramic body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pre-sintered ceramic body is dipped into a coloring solution, then the ceramic can be colored, but the coloring is inhomogeneous on the surface and poor penetration occurs
Solution Approach 1:
The coloring solution is mixed with the ceramic slurry before casting, so the colorants are incorporated into the slip matrix in advance. This preliminary mixing ensures uniform distribution of colorants throughout the ceramic body before shaping and sintering, eliminating the need for post-sintering dipping operations.
Solution Approach 2:
The coloring solution is merged with the ceramic slurry to form a homogeneous mixture. By combining the colorant-containing liquid with the slip material before casting, the invention creates a unified composition where colorants are distributed throughout the entire ceramic body, resulting in uniform internal and surface coloration.
2Manufacturing precision
If the coloring solution properties are optimized for penetration, then color penetration improves, but the process complexity increases
Solution Approach 1:
The invention modifies the physical and chemical parameters of the coloring solution to match the properties of the ceramic slurry. By adjusting viscosity, pH, and other parameters to be comparable to the slip, the coloring solution achieves natural integration without requiring complex optimization of individual solution properties.
3Stability of the object's composition
If coloring is performed after ceramic fabrication, then the ceramic structure is maintained, but the color is not innate to the ceramic
Solution Approach 1:
Colorants are added to the slurry before casting, allowing the color to be incorporated into the ceramic structure during the forming process itself. This preliminary addition of colorants ensures the color becomes an integral part of the ceramic matrix, creating an innate color that is uniform throughout the body.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process ensures complete and homogeneous color penetration throughout the ceramic, eliminating the need for additional coloring steps and maintaining mechanical and optical properties, with the ability to produce ceramics matching specific dental shade standards like VITA Classic.
Implementation Method 1
The primary property of the metallic salt is such that is soluble in the solvent
Implementation Method 2
The solution is thoroughly mixed with the ceramic slurry
Implementation Method 3
The solution is thoroughly mixed with the ceramic slurry, after which the ceramic body is cast
Implementation Method 4
the ceramic body is cast, dried and finally subjected to a sintering process
Data Source
AI summary
In a method of coloring a ceramic material, a coloring solution consisting of metallic salts is introduced to a ceramic slurry. In a slip casting process, a coloring solution consisting of metallic salts is introduced to a ceramic slurry which is cast into green state bodies. A coloring solution that may comprise for example a metallic salt, a solvent, an organic solvent such as derivatives of propylene oxides, and an acid can be introduced to the slip casting process. Such a coloring solution can be added to the slip casting process. In a method, the coloring solution is thoroughly mixed with the ceramic slurry, after which a ceramic body is cast, dried and finally 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 ceramic material used for making dental restorations.