Thermal Outgassing Properties of Mechanically Polished and of Sand- and Bead-Blasted Inconel 600 Surfaces up to 500 deg C

• Published in: Vacuum 1982-05, Vol.32 (5), p.227-232
• Main Authors: Raiter, F, Camposilvan, J
• Format: Article
• Language: English
• ISSN: 0042-207X

Two different types of Inconel 600 samples have been investigated. The first was mechanically polished and chemically cleaned in several steps and had a total hemispherical emissivity at 75 deg C of epsilon sub 1 = 0.146 and a surface roughness of CLA sub 1 = 0.08 mu m, while the second sample was sand- and bead-blasted with epsilon sub 2 = 0.382 and CLA sub 2 = 1.2 mu m. The experimental studies were composed of the determination of desorption spectra from 20 deg C up to 550 deg C at different heating rates, the investigation of the decrease of thermal outgassing rates during a longer heating interval at about 500 deg C and the measurement of equilibrium outgassing rates at higher temperatures of samples which have been heated several days at about 500 deg C. The total outgassing rates and the partial outgassing rates of the main components H sub 2 , H sub 2 O, CO and CO sub 2 have been determined in these studies. Activation energies of desorption, rate constants and equilibrium surface coverages have been calculated from the experimental data using the theory of Redhead.--AA