Enamelled Steel Sheet Coating with Ceramic Particles
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Solution Overview
Problem
Conventional enamelling processes for steel sheets require high temperatures and long firing times, which are not compatible with modern industrial requirements, and involve intensive environmental preparation steps like pickling and degreasing.
Innovation Solution
A process involving a steel sheet coated with a polymer matrix containing non-oxide ceramic particles, which reduces firing temperature by 10-40°C and time by 1-3 minutes, eliminating the need for pre-treatment processes like pickling, by applying a formulation layer with 0.008-5% non-oxide ceramic particles and a polymer that burns completely at 600°C, followed by curing and subsequent enamel application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ground coat enamel with adherence promoting oxides is applied and fired at 780-860°C for 3-8 min, then good adhesion between steel sheet and enamel is obtained, but energy consumption is high and productivity is low
Solution Approach 1:
The patent changes the chemical composition parameters of the ground coat enamel by replacing traditional adherence promoting oxides (Co, Ni, Cu, Mn, Sb, Mo) with non-oxide ceramic particles (SiO2, Al2O3, TiO2, ZrO2, MgO, CaO, BaO, SrO) having specific melting points above 600°C. This compositional parameter change enables the enamel to achieve adequate adhesion at lower firing temperatures (600-800°C) and shorter times (1-3 min), thereby reducing energy consumption while maintaining reliability
Solution Approach 2:
The patent creates a composite ground coat enamel material consisting of a glassy matrix combined with dispersed non-oxide ceramic particles. This composite structure provides both the adhesion properties needed for steel enamel bonding and the thermal stability required for low-temperature firing. The ceramic particles act as nucleation sites and adhesion promoters, enabling the enamel to achieve good bonding at reduced energy input compared to conventional pure glassy enamels
2Reliability
If conventional ground coat enamel is fired for 3-8 min at 780-860°C, then adequate adhesion is achieved, but production time is excessive for modern industrial requirements
Solution Approach 1:
The patent modifies the chemical composition parameters of the ground coat enamel by incorporating non-oxide ceramic particles with specific melting points above 600°C. This compositional change accelerates the adhesion mechanism, allowing adequate bonding to be achieved in 1-3 minutes at 600-800°C instead of 3-8 minutes at 780-860°C, thereby increasing production speed while maintaining adhesion quality
Solution Approach 2:
The non-oxide ceramic particles in the ground coat enamel serve multiple functions simultaneously: they act as adhesion promoters for steel bonding, serve as nucleation sites for enamel glass formation, and provide thermal stability for low-temperature processing. This multi-functionality enables the enamel system to achieve adequate adhesion rapidly at lower temperatures, improving productivity without sacrificing bonding quality
3Reliability
If intensive pickling with acidic solutions and nickling is performed before enamelling, then steel sheet surface preparation is adequate for conventional enamelling, but environmental harm and process complexity increase
Solution Approach 1:
The patent extracts and eliminates the harmful pickling and nickling pre-treatment steps from the conventional enamelling process. By formulating the ground coat enamel with non-oxide ceramic particles that provide both adhesion and surface preparation functions, the process directly applies enamel to minimally prepared steel surfaces without requiring intensive acidic pickling or metallic nickelling, thereby removing the source of environmental harm while maintaining adequate surface preparation quality
Solution Approach 2:
The ground coat enamel itself acts as an intermediary that performs the surface preparation function traditionally requiring separate pickling and nickling steps. The non-oxide ceramic particles in the enamel formulation create a bonding interface that accommodates varying steel surface conditions, eliminating the need for aggressive pre-treatments and their associated environmental harms while ensuring adequate adhesion
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
This process achieves reduced energy consumption and increased productivity while maintaining good adhesion and surface quality of the enamel layer, without the need for intensive environmental preparation steps.
Implementation Method 1
a polymer which, when heated from ambient temperature to 800°C in air, gets burned at more than 80% by weight at 440°C and is completely burned at 600°C
Implementation Method 2
The adhesion of the ground coat enamel on steel is obtained, by firing from 780 to 860°C during 3 to 8 min, via oxido-reduction chemical reaction between the elements of the steel, such as carbon, and adherence promoting oxides of the ground coat enamel
Data Source
AI summary
The invention relates to a steel sheet or part whose composition is suitable for enamelling, and which is coated with a coating consisting of a matrix of polymer in which particles of non-oxide ceramic are homogeneously dispersed. It also relates to the use of this coated steel sheet or part for producing an enamelled steel sheet or part, and to a process for producing an enamelled steel sheet or part allowing a decrease of firing temperature and time compared with conventional firing temperatures and times.