Coating measurements

Regardiess of how sophisticated the eiectronic environment is, the main component for coating measurement remains the monitor quartz crystai. Originaiiy monitor quartzes had a square shape. Fig. 6.4 shows the resonance spectrum of a quartz resonator with the design used today (Fig. 6.3). The iowest resonance frequency is initiaiiy given by a thickness shear... 

It is a long and frustrating process to adjust a controller to an evaporation source, requiring several minutes for stabilization and hours to obtain satisfactory results. Often the parameters selected for a certain rate are not suitable for an altered rate. Thus, a controller should ideally adjust itself, as the new controllers in INFICON coating measuring units do. At the beginning of installation and connection the user has the unit measure the characteristics of the evaporation source. Either a PID controller is used as the basis for slow sources or another type of controller for fast sources without significant dead time. 

Table 3 Elongation at Break of Different Film Coatings, Measured According to ISO 527. High Values of the Elongation at Break Are Indicators for Flexible Film Coatings. Flexible Enteric Films are Required for the Compression of Enteric-coated Particles...

The interfacial resistance between the coating and the lower thermocouple plate is different from the interfacial resistance between the substrate-measurement plate due to light oxidation of the steel substrate, which is not observed for the coating. We have observed that the interfacial resistance of ceramics depends primarily on the surface finish of the ceramic material, since ceramics are chemically stable. Therefore, we use an interfacial resistance that was previously measured between Pyroceram 9606, of the same surface finish as the FGM coating, and the upper thermocouple plate as our interfacial resistance function for the coating-measurement plate interface [6]. Thermal conductivity of the FGM coating can then be extracted from the total conductance data by using these interfacial resistances and the thermal conductivity data for 410 stainless steel. The estimated uncertainty of the measurement system is 5%. 

The results of the coating measurement were presented in Fig. 9. The obtained results are very similar especially in case of impedance modulus. The differences between both instruments in case of impedance argument (in 0.2 100 Flz frequency range) require further... 

All CLTE measurements were corrected for the presence of the silica fiber and the baseline behavior of the TMA sample chamber and probe. To achieve this, a fiber was heated to 750 °C in oxygen to remove the double coating. Measurements were then taken of the bare fiber when it was heated over the same temperature range as that used with the coated fibers. This stored instrumental baseline was subtracted from all subsequent tests on coated fibers. 

PROOF OF DURABILITY OF JAPANESE LACQUER COATING (MEASURING DYNA-MECHANICAL PROPERTIES AGAINST STORAGE TIME)... 

Studies and tests of polyolefin coatings measure various stresses appearing during service and refer to surface quality thickness, thermal impact resistance, chemical resistance and adhesivity (efficiency and durability). 

Chambers and coworkers [72-74] also explored the properties of semiconductive sheets of polypyrrole treated paper and cloth, which they characterize as a parallel RC circuit. They too report that the capacitive part of the complex impedance of the sheets depends on the morphology of the poly pyrrole coating. Measured reflectivity plots for Salisbury screen (narrowband) and Jaumann (broadband) absorbers fabricated from sheets of polypyrrole-treated material are also presented in their article. The measured results agree well with their model calculations, indicating the potential utility of conductive polymer-treated fabrics in radar-absorbing structures. 

Table 39.5 Average fracture toughness (/fj of the coatings measured using different methods.

The best wav to detect a coated measurement electrode is not from... 

Deutsches Institut fiir Normung e. V. (DIN) Metallic coatings - Measurement of coating thickness - X-ray spectrometric methods. Beriin Beuth-Veriag, 2000. 

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