Characterization and Improvement of Heat Resistance of a Polymer-Ceramic Pressure-Sensitive Paint at High Temperatures.

Takenori Furuya,Masato Imai,Takumi Nakai,Masaharu Kameda

doi:10.3390/s21248177

Takenori Furuya, Masato Imai + Show 2 more

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https://doi.org/10.3390/s21248177

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Abstract

Degradation of fast response pressure-sensitive paints (PSP) above room temperature is a serious problem for PSP measurements in high-temperature environments. A standard polymer-ceramic PSP (PC-PSP) composed of platinum(II)-5,10,15,20-tetrakis-(2,3,4,5,6-pentafluorphenyl)-porphyrin (PtTFPP), titania particles and poly(isobutyl methacrylate) (polyIBM) was characterized to elucidate the degradation mechanism. Applying a two-gate lifetime-based method, the PC-PSP has sufficient pressure and temperature sensitivities even at 100 °C, while the luminescence intensity significantly decreases during the test. Subsequent measurements on thermal and photostability as well as luminescence spectra reveal that the main cause of the degradation is the photodegradation of PtTFPP due to direct exposure of the dye molecules to the atmosphere. In order to suppress such degradation, a small amount of urethane resin is added to the dye solution as a simple additional step in the preparation of PC-PSP. The addition of the urethane resin significantly reduces the degradation of the PSP, although its time response is slightly slower than that of the standard PC-PSP.

Highlights

Hiroki Nagai and Yu MatsudaPressure-sensitive paint (PSP) is a molecular sensor that uses luminescent dyes emitting fluorescence or phosphorescence whose properties depend on pressure and temperature [1,2]
We test anot thin layer urethane resin at high temperatures. Forluminescence this purpose, we investigate in detail only theofluminescence intensity, pressure sensitivities, glass transition in with dissolved dyeand on temperature the top of the PC-pressure-sensitive paints (PSP) toand improve its heat temperature, resistance asbut shown the luminescence test a thinoflayer of urethane with dissolved dye on of
The changes in pressure and temperature sensitivity of polymer-ceramic PSPs (PC-PSP) caused by heat treatment without illumination were investigated in detail

Summary

Introduction

Hiroki Nagai and Yu MatsudaPressure-sensitive paint (PSP) is a molecular sensor that uses luminescent dyes emitting fluorescence or phosphorescence whose properties depend on pressure and temperature [1,2]. PSP can be applied to the surface of an object where it is difficult to install sensors or pressure taps, because luminescence is measured non-intrusively with a camera, etc. The development of PSPs with fast response times for unsteady flow field measurement is a major challenge in PSP technology [3,4,5]. The time response of PSP is mostly dominated by gas diffusion in the paint, which can be improved by using porous materials in the paint. Rotor blades are a suitable object to which to apply fast response PSPs. In this paper, we focus on the application of fast-response PSP to compressors [14,15,16,17]. Previous studies have demonstrated that measurements can be made, but it is not clear whether the accuracy is sufficient to evaluate the performance of the compressor

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