Oxide Glass Fluorination via Controlled HF Concentration
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Solution Overview
Problem
Existing methods for fluorinating the surface of oxide glass, such as soda lime glass and synthetic quartz glass, face challenges including poor adhesion, high production costs, and inadequate durability due to excessive etching by hydrogen fluoride, which affects transparency and strength.
Innovation Solution
A method involving contact with a gaseous fluorinating agent, such as elemental fluorine or fluorine compounds, diluted with an inert gas, while controlling the hydrogen fluoride concentration at the surface to no more than 1 mol % to prevent excessive etching and enhance adhesion and surface properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vapor deposition method is used for fluorination, then fluorine can be deposited on oxide glass surface, but adhesion of fluorine to oxide glass is poor
Solution Approach 1:
The patent changes the fundamental parameter of the fluorination method from physical vapor deposition to chemical reaction using gaseous fluorinating agents. This transformation enables strong chemical bonding between fluorine and glass surface, resolving the adhesion problem while maintaining manufacturing feasibility through simple gas-phase treatment processes.
Solution Approach 2:
The patent replaces the mechanical/physical vapor deposition process with a chemical reaction process using gaseous fluorinating agents. This substitution allows fluorine to chemically bond with the glass surface rather than merely depositing physically, thereby achieving superior adhesion.
2Reliability
If vapor deposition method is used for fluorination, then fluorination treatment can be performed, but production cost tends to be high
Solution Approach 1:
The patent employs inexpensive gaseous fluorinating agents that can be used in simple flow-through processes rather than expensive vacuum deposition equipment. The gas-phase reagents are consumed in controlled amounts and can be replaced easily, reducing capital equipment costs and overall production expenses while maintaining treatment quality.
Solution Approach 2:
The patent utilizes gaseous fluorinating agents delivered through pneumatic flow systems instead of complex vacuum deposition apparatus. This approach simplifies the manufacturing equipment requirements and reduces production costs while achieving effective fluorination treatment through gas-phase chemical reactions.
3Reliability
If fluorination is performed under low pressure conditions, then fluorine can be adsorbed on glass surface, but treatment time becomes long and adhesion is weak
Solution Approach 1:
The patent changes the pressure parameter from low vacuum conditions to atmospheric or near-atmospheric pressure operations. This parameter change enables faster reaction rates and shorter treatment times while maintaining strong adhesion through chemical bonding mechanisms. The use of reactive gaseous fluorinating agents at higher pressures accelerates the fluorination process significantly.
Solution Approach 2:
The patent replaces the low-pressure physical adsorption process with a chemical reaction process that proceeds rapidly at atmospheric pressure. This substitution transforms a slow, time-consuming adsorption mechanism into a fast chemical reaction that achieves durable adhesion without requiring extended treatment times or vacuum conditions.
4Reliability
If hydrogen fluoride concentration is high during fluorination, then fluorination reaction proceeds, but excessive etching occurs affecting transparency and strength
Solution Approach 1:
The patent optimizes the concentration parameter of hydrogen fluoride in the gaseous fluorinating agent to a specific range that enables sufficient fluorination reaction while preventing excessive etching. This parameter optimization balances the competing requirements of achieving effective fluorine incorporation into the glass surface while maintaining the structural integrity, transparency, and strength of the glass substrate.
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 allows for low-cost, effective fluorination of oxide glass surfaces with improved adhesion and surface properties like hydrophilicity and reduced softening point, maintaining transparency and strength.
Implementation Method 1
a substance which contains a fluorine atom as a part of its chemical structure and which is capable of cleaving a bond between an oxygen atom and a metal atom in the framework of oxide glass and forming a bond between the fluorine atom and the metal atom
Implementation Method 2
to introduce fluorine to a portion in a certain depth from the surface of oxide glass, for example, to a portion in a depth of about 2,000 nm from the surface
Data Source
AI summary
To provide a novel fluorination treatment method whereby the surface of oxide glass can be treated for fluorination at low cost and with excellent adhesiveness.A method for treating the surface of oxide glass, which comprises contacting the surface of oxide glass with a gas of a fluorinating agent or a mixed gas having a fluorinating agent diluted with an inert gas, wherein the fluorinating agent is an elemental fluorine, or a fluorine compound capable of cleaving a bond between an oxygen atom and a metal atom in the framework of the oxide glass and forming a bond between a fluorine atom and the metal atom; and the concentration of hydrogen fluoride at the surface of oxide glass with which the fluorinating agent is in contact, is controlled to be at most 1 mol %.