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A Ceramic Diffusion Bonding Method for Passive LC High-Temperature Pressure Sensor.

Chen Li1,2, Boshan Sun3,4, Yanan Xue5,6

  • 1Key Laboratory of Instrumentation Science and Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China. lichen@nuc.edu.cn.

Sensors (Basel, Switzerland)
|August 17, 2018
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Summary

This study introduces a new method for bonding alumina ceramic to create a sealed cavity for high-temperature pressure sensing. The bonding technique allows the fabrication of a cavity that maintains its structure at temperatures above 900 °C. The researchers integrated inductors and capacitors using thick-film technology to form a wireless passive LC sensor. The sensor was tested using a system platform that simulated high-temperature conditions. The results showed that the sensor could accurately measure pressure in extreme environments. The method's simplicity and reliability suggest it could be used to develop all-ceramic sensors for industrial applications. The authors propose that this approach could lead to more durable and efficient pressure sensors for harsh environments.

Keywords:
alumina ceramicdiffusion bondinghigh-temperature applicationpressure sensorsensitive cavityCeramic bondingHigh-temperature sensorsWireless passive LC sensorThick-film integration

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Area of Science:

  • Ceramic materials engineering
  • High-temperature sensor development
  • Wireless passive sensing technologies

Background:

High-temperature pressure sensing remains a challenge in extreme environments. Alumina ceramic shows promise for such applications due to its thermal stability. Prior research has explored ceramic materials for sensor fabrication, but bonding techniques remain underdeveloped. No prior work had resolved the issue of forming sealed cavities in alumina for high-temperature use. Existing methods often rely on external components, limiting integration. The gap motivated the search for a direct bonding approach. This gap motivated the development of a method using thick-film technology. That uncertainty drove the need for testing in real-world conditions.

Purpose Of The Study:

The aim was to develop a direct bonding method for alumina ceramic to create sealed cavities. This approach could enable high-temperature pressure sensing without external components. The specific problem involved forming a cavity that maintains integrity at elevated temperatures. The motivation stemmed from the need for reliable sensors in harsh environments. Conventional methods lack the necessary thermal stability. This study sought to integrate inductors and capacitors directly onto the ceramic. The goal was to test the method's performance in real-world conditions. The researchers propose that this could lead to all-ceramic sensor designs.

Main Methods:

Alumina ceramic substrates were bonded using a direct method to form a cavity. The bonding process was optimized for high-temperature applications. Thick-film technology was used to integrate inductors and capacitors on the ceramic. The fabricated cavity was tested for sealing properties at elevated temperatures. A wireless passive LC sensor was assembled using the bonded substrates. The sensor was tested using a dedicated system platform. Experimental conditions replicated high-temperature pressure environments. The researchers propose that this method could be scaled for mass production.

Main Results:

The sensor successfully measured pressure above 900 °C during testing. The cavity showed excellent sealing properties under high-temperature conditions. The wireless passive LC design allowed for remote pressure monitoring. No external components were required for the sensor to function. The bonding method produced a stable and durable cavity structure. The inductor and capacitor integration improved the sensor's sensitivity. The researchers propose that the method is suitable for harsh environments. The experimental results suggest potential for industrial applications.

Conclusions:

The direct bonding method produced a sealed cavity suitable for high-temperature pressure sensing. The sensor's performance above 900 °C confirms the method's effectiveness. The wireless passive LC design enables remote monitoring without external components. The researchers propose that this method could be used for all-ceramic sensors. The thick-film integration improved the sensor's reliability. The experimental results suggest potential for industrial use. The method's simplicity supports future development. The authors suggest further testing in real-world conditions.

The method enables the fabrication of a sealed cavity suitable for high-temperature pressure sensing above 900 °C.

Thick-film technology was used to integrate the inductor and capacitor directly onto the ceramic substrate.

The design allows for remote pressure monitoring without the need for external components or power sources.

The cavity provides a sealed environment that maintains structural integrity at high temperatures, enabling accurate pressure measurements.

The sensor was tested for pressure measurements above 900 °C, confirming its high-temperature capability.

The authors propose that the method could be used to develop all-ceramic pressure sensors for harsh environments.