Arc evaporation of multicomponent MCrAlY cathodes

Study of bond coating pre-oxidation heat treatments for high temperature thin film sensors in gas turbine engine applications

“…Similar premature cathode degradation was noted by Knotek et al [79] in a high-chromium MCrAlY cathode after 20 hours of evaporation, where the cathode erosion behaviour was attributed to the hot isostatic pressing (HIP) treatment used in the manufacture of these cathodes. The HIP treatment can result in a non-homogeneous structure around the periphery of the circular cathode [79].…”

“…In previous work by Leontiev et al [70] and Knotek et al [79], CA-PVD has been investigated as an alternative to thermal spray (TS) deposition processes by demonstrating the ability to deposit multi-constituent BC materials that are more dense and adherent than coatings produced through TS techniques, and at sufficiently high deposition rates and volumes to make cathodic arc PVD a commercially competitive alternative.…”

“…The majority of cathodes tested by Knotek et al [79], however, showed that it was possible to achieve stable and largely even evaporation of multicomponent cathode compositions using the CA-PVD process.…”

Some Applications of Cathodic Arc Coatings

“…Arc cathodes containing five to seven elements have been investigated for ''MCrAlY'' coatings on turbine blades [43]. MCrAlY implies that the cathode and resulting coatings contain the elements Cr, Al, and Y, as well as other metals ''M.''…”