Multilayer Solar-Control Glass Coating for Heat-Treated Durability
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Solution Overview
Problem
Current glass coatings for solar control in the construction industry fail to effectively block infrared radiation, maintain mechanical strength, and withstand heat treatment while ensuring high visible light transmittance and chemical resistance, making it challenging to reduce solar radiation and energy consumption.
Innovation Solution
A multilayer coating composed of dielectric and metallic materials, including Si3N4, Nb, Ni—Cr alloy, and TiN, deposited using the sputtering process, which provides solar control properties, mechanical strength, and heat resistance with specific layer thicknesses to adjust light transmittance and solar factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a coating is applied to block infrared radiation, then solar control properties are improved, but mechanical strength and heat treatment resistance deteriorate
Solution Approach 1:
The coating is divided into multiple functional layers: a first dielectric layer (Si3N4) for adhesion and protection, a metallic layer (Nb) for infrared reflection, a protective alloy layer (Ni-Cr) for oxidation resistance during heat treatment, and a second dielectric layer (Si3N4) for additional protection. This segmentation allows each layer to specialize in one function, resolving the contradiction between infrared blocking and mechanical strength.
Solution Approach 2:
The coating uses composite materials combining dielectric materials (Si3N4) with metallic materials (Nb, Ni-Cr alloy). This composite structure enables the coating to simultaneously achieve infrared radiation blocking through the metallic layer while maintaining mechanical strength and heat treatment resistance through the protective dielectric and alloy layers.
2Loss of energy
If a coating is applied to reduce solar radiation transmission, then energy efficiency is improved, but visible light transmittance may deteriorate
Solution Approach 1:
The coating exhibits different optical properties at different wavelengths: the metallic Nb layer strongly reflects infrared radiation (wavelengths >780nm) to reduce solar heat gain, while the dielectric Si3N4 layers and controlled layer thicknesses allow high transmittance in the visible range (380-780nm). This local quality differentiation resolves the contradiction between energy efficiency and visible light transmittance.
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 coating effectively reduces solar radiation transmission, enhances mechanical and chemical protection, and maintains stability under heat treatment and chemical exposure, improving energy efficiency and user comfort.
Implementation Method 1
deposited using the sputtering process
Implementation Method 2
reflecting a total of about 7%
Implementation Method 3
absorbs a part of the UV radiation
Data Source
AI summary
The invention relates to a glass substrate including a stack of coating layers having control properties, in which stack comprises at least one niobium metal layer located between a layer of a dielectric material selected from Si3N4 or TiOx and a layer of a protective metal material selected from TIN or Ni—Cr, conferring solar control and heat resistance properties on the glass substrate.