Metal-Based Coating Composition for Heat-Treated Glass Substrates
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Solution Overview
Problem
It is challenging to design coating compositions for glass substrates that maintain the same appearance and functional characteristics before and after heat treatment processes such as bending, tempering, or heat strengthening, which are commonly required in various applications.
Innovation Solution
A coated substrate comprising a metal-based layer selected from tungsten, chromium, tantalum, molybdenum, aluminum, and their alloys, combined with a dielectric layer of silicon nitride (SixNy) with specific stoichiometry, applied in multiple configurations to ensure durability and aesthetic stability across heat treatment conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a functional coating is applied to a glass substrate before heat treatment, then the substrate can achieve desired performance properties, but the appearance and functional characteristics change after heat treatment
Solution Approach 1:
The patent uses a composite coating structure consisting of multiple layers including metal-based layers (tungsten, chromium, tantalum, molybdenum, aluminum, or their alloys) combined with dielectric layers (silicon nitride with specific stoichiometry SixNy where x/y ranges from 0.75 to 1.5). This composite structure maintains color stability (ΔEcmc (1.5:1) values no greater than 8 units) and functional properties after heat treatment at temperatures between 1150°F and 1450°F, resolving the contradiction between achieving performance properties and maintaining appearance stability.
2Ease of manufacture
If the glass is bent after coating, then the coating process is simplified, but the coating appearance and properties change due to heat treatment
Solution Approach 1:
The patent specifies precise compositional parameters for the coating layers, including metal-based layers with specific metal selections and dielectric layers with controlled silicon nitride stoichiometry (x/y ratio from 0.75 to 1.5). These parameter controls ensure that the coating maintains color stability (ΔEcmc (1.5:1) ≤ 8) and functional characteristics after heat treatment during bending processes, thereby maintaining manufacturing precision while allowing ease of manufacture.
3Strength
If heat treatment is applied to achieve desired glass properties, then the glass performance is improved, but the coating color and appearance deteriorate
Solution Approach 1:
The composite coating structure with metal-based layers (tungsten, chromium, tantalum, molybdenum, aluminum, or their alloys) and dielectric layers (silicon nitride SixNy with x/y from 0.75 to 1.5) is designed to withstand heat treatment temperatures (1150°F-1450°F) required for glass tempering and strengthening. The specific composition ratios and layer structures maintain color stability (ΔEcmc (1.5:1) ≤ 8) while allowing the glass to achieve desired strength properties through heat treatment.
Data Source
AI summary
A coated substrate is disclosed. The coated substrate includes a substrate and a coating composition over the substrate comprising at least one metal based layer selected from tungsten, chromium, tantalum, molybdenum, aluminum, niobium, and mixtures and alloys thereof; and mixtures and alloys of cobalt and chromium; and at least one dielectric layer including SixNy, where x/y ranges from 0.75 to 1.5, over the metal based layer. The ΔEcmc (1.5:1) (T), ΔEcmc (1.5:1) (R1) and ΔEcmc (1.5:1) (R2) of a non-heat treated, coated substrate as compared to a heat treated, coated substrate according to the present invention are no greater than 8 units.