Monolithic Ceramic Phosphor Composite for High-Temperature Sensing
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Solution Overview
Problem
Current temperature-sensing phosphors with chemical binders, such as epoxy and polysiloxanes, have limited thermal stability, restricting their use to temperatures below 400°C and degrading under high-temperature thermal cycling, making them unsuitable for applications requiring high-temperature sensing.
Innovation Solution
A monolithic ceramic metal oxide phosphor composite is developed by mixing thermographic phosphors with metal oxide materials, followed by calcination, which forms a stable ceramic composite that can withstand temperatures above 400°C without thermal degradation, allowing for repeatable and durable high-temperature sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical binders (epoxy, polysiloxanes) are used to bind phosphors, then good thermal contact and uniform temperature response are achieved, but thermal stability is limited to below 400°C
Solution Approach 1:
The invention changes the fundamental parameter of the binder material from organic chemicals (epoxy, polysiloxanes) to inorganic ceramic material. This parameter change enables the binder to withstand temperatures above 400°C while maintaining thermal contact and uniform temperature response, thus resolving the contradiction between thermal stability and temperature range adaptability
Solution Approach 2:
The invention creates a composite material system where phosphor particles are embedded within a ceramic binder matrix. This composite structure combines the temperature sensing capability of phosphors with the high-temperature stability of ceramic materials, enabling both good thermal contact and thermal stability above 400°C
2Reliability
If chemical binders are used for high temperature sensing, then thermal stability can be improved, but the binders may change the temperature response of the thermographic phosphor under high temperature thermal cycling
Solution Approach 1:
The invention changes the chemical composition parameter of the binder from organic to inorganic ceramic material, which has superior thermal stability and does not undergo chemical degradation or phase changes at high temperatures. This ensures that the binder does not alter the phosphor's temperature response characteristics during thermal cycling
Solution Approach 2:
The invention uses a binder material (ceramic) that is inherently stable and does not degrade over time at high temperatures, eliminating the need for frequent replacement or recalibration that would be required if unstable binders were used
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 monolithic ceramic metal oxide phosphor composite enables stable and repeatable temperature sensing above 400°C, maintaining the temperature sensing properties of the infused phosphor and providing durability in high-temperature applications.
Implementation Method 1
Phosphors when excited with a light within a certain wavelength emit a light within a different wavelength. Certain characteristics of the emitted light change with temperature including brightness, color, and afterglow duration.
Implementation Method 2
Phosphor used for measuring the temperature of an object... The response of the emitted light to temperature is monitored by various methods, such as analyzing the change in emission intensity at a single wavelength or the change in intensity ratio of two or more wavelengths, lifetime decay, and shift in emission wavelength peak.
Implementation Method 3
Phosphors are commonly bound using a binder to achieve good thermal contact and uniform temperature response... The monolithic ceramic metal oxide phosphor composite comprises a thermographic phosphor and a metal oxide material... providing durable high-temperature sensing
Data Source
AI summary
Examples of a monolithic phosphor composite for measuring a parameter of an object are disclosed. The ceramic metal oxide phosphor composite is used in an optical device for measuring the parameter of the measuring object. The device comprises a fiber optic probe with a light guide, a light source operatively coupled to the fiber optic probe to provide excitation light into the light guide, a monolithic ceramic metal oxide phosphor composite functionally coupled to a tip of the fiber optic probe, a sensor operatively coupled to the fiber optic probe to detect the emitted light and a processing unit functionally coupled to the sensor to process the emitted light. The monolithic ceramic metal oxide phosphor composite can be embedded in a notch made into the object or can be adhered to a surface of the object with a binder. When the monolithic ceramic metal oxide phosphor composite is illuminated with the excitation light it emits light in a wavelength different from the excitation light and a change in emission intensity at a single wavelength or the change in intensity ratio of two or more wavelengths, a shift in emission wavelength peak or a decay time of the phosphor luminescence is a function of the measuring parameter.