These four common high-temperature ceramic substrates, 99Al 2O3, 97Al 2 O3, Sapphire and ZrO 2, have good oxidation and corrosion resistance and maintain stable performance even in harsh environments. Since the material processing technology of these ceramics is very mature, it is expected that it will be possible to use them to prepare high-temperature sensors that can work above 1000 °C. Therefore, we chose these four stainless tile trim refractory aluminum tile substrates for development.

The mechanical and thermal properties of refractory ceramic substrates are of great significance to its substrate materials for use as high-temperature pressure sensors. Any change in temperature can significantly affect the performance of the sensor, especially under contact conditions with particularly high stress levels. There are several methods that can be used to evaluate mechanical properties, and the three-point bending test has been used to measure stainless steel tile trim the strength of composite aluminum tiles; Hertz indentation testing has been used to measure the stress-strain characteristics of alumina and zirconia ceramic plates.
For hertz indentation testing, three conditions are required:
First, the deformation of the contact surface should be small;
Second, second, the contact surface must be oval;
Third, the contact object should appear as an elastic semispace.

For measurements of thermal properties, such as thermal conductivity, commonly used tests include steady-state and non-steady-state methods. The steady-state method includes the heat flow meter method and the hot plate method; Non-stationary methods include the hot wire method and the transient laser emission method. Steady-state methods are limited to measuring longitudinal thermal conductivity and have a limited effective temperature range. In addition, these methods are mainly suitable for low thermal conductivity materials and thermal insulation materials. In another study, a transient short-hot wire technology was developed for measuring both thermal conductivity and thermal diffusion rates; Thermophysical properties and effects of hot wires, insulating coatings and sample sizes were studied. In the hotline method, the hot wire stainless steel tile edge trim needs to be inserted into the sample before the test, and a larger sample volume is required. Considering that the Mohs hardness of these four aluminum tiles is relatively large, this method is not very convenient for the measurement of these ceramic samples in this study.

Laser flash methods, such as transient laser emission, have been used to measure the thermal properties of ceramics and metals, and may also be suitable for measuring the thermal properties of polymers. The advantages of the laser flash method are that the sample can be small, the detection speed is fast, and the effective temperature range is wide. During the test, only the relative temperature is measured, and there is no need to calibrate the instrument to make absolute temperature measurements. By measuring the mechanical and thermal properties of aluminium tiles at high temperatures in a temperature range of 25°C to 1500°C, we can evaluate their suitability in the preparation of sensor devices for use in ultra-high temperature environments.