Titanium Nitride Solar-Control Glazing for Low-Emissivity Durability
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Solution Overview
Problem
Existing solar control glazing technologies face challenges in achieving high light transmission while maintaining low emissivity and durability, particularly when exposed to heat treatments, and often require silver-based layers that are sensitive to moisture.
Innovation Solution
A stack of thin-film layers comprising titanium nitride and dielectric materials, with intermediate layers of aluminum, silicon, or titanium, is used to enhance solar control properties, ensuring high light transmission and low emissivity without silver, and is resistant to moisture and heat treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver-based functional layers are used to achieve low emissivity, then thermal insulation properties are improved, but sensitivity to moisture and humidity increases
Solution Approach 1:
The patent removes silver-based functional layers from the glazing stack, extracting the moisture sensitivity problem while retaining thermal insulation functionality through alternative materials like titanium nitride and dielectric layers
Solution Approach 2:
The patent employs composite material stacks combining titanium nitride functional layers with dielectric materials (silicon oxide, silicon nitride, titanium oxide) to achieve low emissivity and thermal insulation without using moisture-sensitive silver
2Reliability
If titanium nitride layers are used to improve durability and moisture resistance, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the thickness parameters of titanium nitride layers (typically 5-50 nm) and dielectric layers to achieve the desired balance between durability, optical properties, and manufacturability using conventional deposition techniques
3Reliability
If heat treatment is applied to improve durability, then reliability is improved, but light transmission decreases
Solution Approach 1:
The patent carefully controls heat treatment parameters (temperature, duration, atmosphere) to achieve durability improvement while minimizing light transmission loss, and optimizes the initial stack design to compensate for expected treatment effects
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 solution achieves improved selectivity and durability, allowing high light transmission and low emissivity, even after heat treatments, while maintaining thermal insulation properties, and is resistant to moisture and chemical stresses.
Implementation Method 1
layers that act on solar and/or thermal radiation primarily by reflecting and/or absorbing near-infrared (solar) or far-infrared (thermal) radiation
Implementation Method 2
Such glazings equipped with stacks of thin films act on the incident IR radiation either essentially by the absorption of said radiation by the functional layer(s), or essentially by reflection by these same layers
Implementation Method 3
other layers, which are generally made of dielectric material and whose main function is usually to provide chemical or mechanical protection to the functional layers
Implementation Method 4
an intermediate layer comprising at least one element selected from silicon, aluminum, titanium or a mixture of at least two of these elements, said intermediate layer being deposited between said layer TN 1 and said first module M 1 and/or between said layer TN 1 and said second module M 2
Data Source
AI summary
Glass article with sunscreen properties comprising at least one glass substrate provided with a stack of layers, in which the stack successively comprises, from the surface of the substrate: - a first module M1 consisting of a layer based on a dielectric material having a thickness e 1 <sb /> or of a set of layers based on materials - a layer TN1 comprising titanium nitride and preferably based on titanium nitride, having a thickness of between 2 nanometers and 80 nanometers, - a second module M2 consisting of a layer based on a dielectric material having a thickness e 2 or of a set of layers based on dielectric materials having a cumulative thickness e 2 , - an intermediate layer comprising at least one element chosen from silicon, aluminium, titanium or a mixture of at least two of said elements being deposited between the layer TN1 and the first module M1 and/or between the layer TN1 and the second module M2, the intermediate layer(s) having a thickness of between 0.2 nm and 6 nm.