Platinum solution for silver decoration and use thereof
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Solution Overview
Problem
Existing ceramic products decorated with silver or gold designs often spark when heated by microwave ovens due to high-frequency electromagnetic waves, lacking both luster and effective coloration.
Innovation Solution
A platinum solution comprising Pt, Si, and Bi, with specific weight ratios of Pt, Au, Rh, Pd, Ag, and other metal elements, is used to create a sintered body that reduces electrical conductivity and prevents sparking, while maintaining a lustrous silver color and excellent coloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a silver-colored decorative portion is created with high luster and excellent coloration, then aesthetic appearance is improved, but electrical conductivity increases causing sparking when heated by microwave oven
Solution Approach 1:
The patent applies local quality by creating a decorative layer with specific spatial distribution of components: metal particles (Pt, Au, Rh, Pd, Ag) are distributed within a glass component matrix. The metal particles provide localized luster and coloration, while the glass matrix provides localized electrical insulation. This spatial arrangement allows the decorative portion to simultaneously exhibit high luster while preventing sparking by isolating conductive metal particles within insulating glass regions.
Solution Approach 2:
The patent employs composite materials by combining metal particles (Pt, Au, Rh, Pd, Ag) with glass components (SiO2, B2O3, Al2O3) to form a decorative layer. The metal particles provide luster and coloration, while the glass component provides electrical insulation. The composite structure allows the decorative portion to simultaneously achieve high luster and non-sparking properties by integrating both conductive and insulating materials in a unified layer.
2Reliability
If glass component content is increased to reduce electrical conductivity and prevent sparking, then safety is improved, but softening point decreases causing uneven distribution of glass component in gravity direction
Solution Approach 1:
The patent applies parameter changes by optimizing the chemical composition of the glass component to achieve a softening point of 700°C or higher. Specific glass compositions are selected with high softening points (e.g., containing SiO2, B2O3, Al2O3 in specific ratios) to ensure that the glass component maintains its viscosity and distributes uniformly during the heating and cooling process in the microwave oven, preventing gravitational settling while maintaining electrical insulation properties.
3Illumination intensity
If ratio of precious metal elements is increased to achieve better coloration, then aesthetic appearance is improved, but cost increases and electrical conductivity may increase
Solution Approach 1:
The patent applies local quality by using precious metal particles (Pt, Au, Rh, Pd, Ag) dispersed within the glass matrix rather than using bulk precious metal. The precious metals are concentrated in small particles that provide luster and coloration locally, while the majority of the decorative layer volume is occupied by the glass matrix. This reduces the total quantity of expensive precious metals needed while maintaining excellent coloration and luster.
Solution Approach 2:
The patent employs composite materials by combining precious metal particles with a glass component matrix. The glass component serves as a cost-effective base material that provides structural support and electrical insulation, while small amounts of precious metal particles provide the desired luster and coloration. This composite approach significantly reduces the quantity of expensive precious metals required compared to using pure precious metal decorations.
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 platinum solution achieves a silver-colored decorative portion that is non-sparking, lustrous, and has excellent coloration, suitable for use in microwave-safe ceramic products, such as tableware, by reducing electrical conductivity and ensuring even glass component distribution.
Implementation Method 1
the platinum solution includes Si and Bi that become glass components after firing, so that electrical conductivity of the sintered body is reduced and generation of sparks by heating by a microwave oven can be prevented
Implementation Method 2
generation of sparks by heating by a microwave oven can be prevented
Implementation Method 3
a ceramic product including a sintered body of the platinum solution
Data Source
AI summary
The present disclosure provides a technology that realizes a silver-colored decorative portion that does not spark when heated by a microwave oven, is lustrous, and has excellent coloration. A platinum solution disclosed herein is a platinum solution used for silver decoration of a ceramic substrate and includes at least Pt, Si, and Bi. In terms of a weight ratio where a total of a metal element included in the platinum solution and Si is 100 wt %, the platinum solution has a composition that includes 50 wt % to 99 wt % of Pt, 0 wt % to 25.5 wt % of a total of Au, Rh, Pd, and Ag (where a content of Rh is 0 wt % to 8.5 wt %), 11 wt % or less of Si, 10 wt % or less of Bi, 0 wt % to 5 wt % of Al, and 0 wt % to 15 wt % of other metal elements.