Multicoated Effect Pigments for High-Temperature Ceramic Glazes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing golden effect pigments are not temperature-stable at high temperatures (>900°C) and undergo phase reactions, leading to loss of color and effect in ceramic glazes and other high-temperature applications.
Innovation Solution
Developed effect pigments with a layer sequence comprising pseudobrookite layers separated by a thick separation layer, ensuring no phase reactions occur between layers, maintaining the desired pearlescent effect and color at temperatures above 800°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If golden effect pigments are used for high-temperature ceramic glazes, then intense color and decorative effect are achieved, but the pigments undergo phase reactions and lose color at temperatures above 900°C
Solution Approach 1:
The pigment is divided into multiple thin oxide layers (TiO2, Fe2O3, Cr2O3, ZnO, SnO2) deposited in sequence on a substrate, with each layer contributing to the overall optical effect and thermal stability. This segmented structure prevents phase reactions by isolating reactive components.
Solution Approach 2:
The pigment combines multiple metal oxides (TiO2, Fe2O3, Cr2O3, ZnO, SnO2) in a layered composite structure on a flake substrate, creating a material that exhibits both intense golden color and high temperature stability through the synergistic interaction of different oxide layers.
2Illumination intensity
If multilayered oxide structures are applied to achieve intense color, then chroma and gloss are improved, but solid-state reactions occur between layers at high temperatures causing color change
Solution Approach 1:
Different oxide layers are strategically positioned with specific thicknesses (TiO2: 5-15nm, Fe2O3: 3-10nm, Cr2O3: 2-8nm, ZnO: 8-20nm, SnO2: 10-30nm) to create local optical properties that produce the desired golden effect while maintaining thermal stability through controlled layer composition.
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 pigments exhibit high temperature stability, maintaining intense color and gloss in high-temperature applications such as ceramic glazes and ceramics.
Implementation Method 1
The particularly intensely coloured effect pigments are frequently multilayered pigments which have an alternating sequence of oxide layers of different refractive index on a flake-form substrate
Implementation Method 2
a high-refractive-index coating having a refractive index of n≥1.8
Data Source
AI summary
Temperature-stable effect pigments based on multicoated flake-form substrates, and the use thereof in paints, coatings, printing inks, plastics and in particular in glazes, enamels, ceramic or glass-like materials.