Break-resistant Glass Sensor Electrode via Potassium Ion Exchange
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Solution Overview
Problem
Glass electrodes used in sensors are prone to cracking and breakage due to mechanical stresses during assembly, leading to measurement inaccuracies or failure.
Innovation Solution
A method to produce a break-resistant glass component by exchanging sodium and lithium ions in the glass surface with potassium ions at 200-400°C, creating a compressive stress that enhances fracture strength, using a potassium nitrate melt or solution, and connecting inner and outer shaft tubes in a material-locking manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional sodium-containing and/or lithium-containing glass is used for glass electrodes, then the glass components can be manufactured with standard materials, but the glass is susceptible to cracking and breakage due to mechanical stresses during assembly
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition of the glass, specifically replacing sodium and lithium ions with potassium ions. This compositional parameter change fundamentally alters the glass properties, transforming it from a fragile material to a break-resistant material that can withstand mechanical stresses during assembly and operation.
Solution Approach 2:
The patent creates a composite glass material by incorporating potassium ions into the glass matrix, forming a new material composition that combines the manufacturing advantages of conventional glass with enhanced mechanical strength and crack resistance, thereby resolving the contradiction between ease of manufacture and break resistance.
2Ease of manufacture
If glass components are heated, melted and deformed using gas burners or other heat sources during assembly, then the glass components can be connected, but mechanical stresses arise that lead to cracking
Solution Approach 1:
The patent changes the material parameter by using potassium-containing glass instead of conventional sodium or lithium glass. This parameter change results in a material with inherently higher fracture strength and better resistance to thermal and mechanical stresses, allowing the glass components to withstand the heating and deformation processes without cracking.
Solution Approach 2:
The patent applies beforehand cushioning by pre-treating the glass components with potassium ions before assembly. This preliminary treatment creates a stress-resistant surface layer that cushions against the mechanical stresses that will arise during subsequent heating and assembly operations, preventing crack formation.
3Reliability
If the glass component is treated with potassium nitrate melt or solution at 200-400°C, then potassium ions replace sodium and lithium ions on the glass surface creating compressive stress, but the process requires controlled temperature conditions
Solution Approach 1:
The patent utilizes parameter changes by controlling the temperature parameter during the potassium ion exchange process. By maintaining the temperature within the specific range of 200-400°C, the patent achieves optimal ion replacement and compressive stress formation, maximizing the fracture strength enhancement while managing manufacturing complexity through defined process parameters.
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 resulting glass component exhibits improved scratch resistance and fracture strength, withstanding loads up to 40 Newtons without cracking, compared to conventional glass which cracks at 5 Newtons, and maintains measurement integrity.
Implementation Method 1
By exchanging the sodium ions and lithium ions of the glass for potassium ions at a temperature of 200-400° C., lower-period alkali metal ions, such as sodium and/or lithium ions, in layers close to the surface are replaced by potassium ions.
Implementation Method 2
As a result, a surface compressive stress, which hinders crack growth and results in high fracture strength, arises.
Implementation Method 3
By exchanging the sodium ions and lithium ions of the glass for potassium ions at a temperature of 200-400° C.
Data Source
AI summary
A method for producing a break-resistant glass component of an analyte-sensitive sensor includes providing at least one glass component of a sensor, which consists of a sodium-containing and/or lithium-containing glass, such as a sodium silicate and/or lithium silicate glass, and bringing the at least one glass component into contact with a melt or solution containing potassium nitrate. The glass component includes an inner shaft tube and an outer shaft tube surrounding the inner shaft tube and is connected in a material-locking manner to the inner shaft tube.