Enamel Paste Composition with Heterogeneous Frit Microstructure
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Solution Overview
Problem
The automotive glazing industry faces challenges in achieving enamel compositions that fuse at lower temperatures while maintaining desirable bulk properties such as acid durability, coefficient of thermal expansion (CTE) match, and mechanical and optical properties typically associated with higher fusing temperature frits, especially with the trend towards thinner substrates and reduced energy consumption.
Innovation Solution
An enamel paste composition comprising at least two glass frits, where the first glass frit has a larger particle size and higher glass transition temperature than the second glass frit, forming a 'bricks-and-mortar' microstructure upon firing, allowing for cohesion and adhesion to the substrate, and enabling tailored macroscopic properties like acid durability and reduced optical distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional enamels are fired at high temperatures to achieve desirable bulk properties, then acid durability and CTE match are improved, but energy consumption increases and substrate softening occurs
Solution Approach 1:
The enamel composition is segmented into multiple glass frit components with different glass transition temperatures (Tg). The first glass frit has Tg of 400-500°C and the second glass frit has Tg of 500-600°C. This segmentation allows the enamel to achieve high-temperature performance properties at lower overall firing temperatures, reducing energy consumption while maintaining acid durability and CTE match through the combined action of different frit components
Solution Approach 2:
The invention uses a composite glass frit system combining at least two different glass frits with complementary properties. The first glass frit provides low-temperature flow and bonding, while the second glass frit contributes to acid resistance and thermal expansion matching. This composite approach enables the enamel to achieve desirable bulk properties at reduced firing temperatures, lowering energy consumption without sacrificing reliability
2Stability of the object's composition
If conventional enamels use multiple glass frits with comparable particle sizes, then homogeneous microstructure is achieved, but lower temperature fusion capability is lost
Solution Approach 1:
The invention applies local quality by assigning different particle size characteristics to different glass frit components. The first glass frit (lower Tg) and second glass frit (higher Tg) can have different particle size distributions optimized for their respective functions. This local differentiation in particle quality enables each frit component to contribute optimally to the overall enamel performance at lower firing temperatures while maintaining microstructural homogeneity through controlled interaction between the components
3Weight of moving object
If thinner glass substrates are used to reduce vehicle weight, then fuel consumption decreases, but the substrate becomes more susceptible to damage during high temperature firing
Solution Approach 1:
The invention changes the temperature parameter of the firing process by using glass frits with lower glass transition temperatures. The first glass frit with Tg of 400-500°C enables the enamel to soften and bond to thinner substrates at reduced temperatures, preventing substrate damage while still achieving the desired enamel properties. This parameter change allows the use of thinner, lighter glass substrates without compromising substrate strength during processing
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 approach enables enamel to fuse at lower temperatures while maintaining performance characteristics of high fusing temperature frits, reducing energy consumption, and minimizing glass weakening, with improved acid durability and reduced optical distortions, suitable for advanced driver-assistance systems and autonomous driving vehicles.
Implementation Method 1
the second lower glass transition temperature frit is sintered around the larger particles of the first higher glass transition temperature frit
Implementation Method 2
during which the organic carrier medium of the paste or ink burns off
Data Source
AI summary
An enamel paste composition includes glass frit; a pigment; and an organic carrier medium; wherein the glass frit includes at least two glass frits including a first glass frit and a second glass frit, and wherein the first glass frit has a larger particle size and a higher glass transition temperature than the second glass frit. Also described is a method of forming an enamel coating by depositing the enamel paste composition on a substrate; and firing the enamel paste to form an enamel coating on the substrate, the enamel coating having a heterogeneous frit microstructure with particles of the first frit embedded in a matrix of second frit.