title: Very high laser-damage threshold of polymer-derived Si(B)CN-carbon nanotube composite coatings.
abstract: We study the laser irradiance behavior and resulting structural evolution of polymer-derived silicon-boron-carbonitride (Si(B)CN) functionalized multiwall carbon nanotube (MWCNT) composite spray coatings on copper substrate. We report a damage threshold value of 15 kWcm(-2) and an optical absorbance of 0.97 after irradiation. This is an order of magnitude improvement over MWCNT (1.4 kWcm(-2), 0.76), SWCNT (0.8 kWcm(-2), 0.65) and carbon paint (0.1 kWcm(-2), 0.87) coatings previously tested at 10.6 μm (2.5 kW CO2 laser) exposure. Electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy suggests partial oxidation of Si(B)CN forming a stable protective SiO2 phase upon irradiation.
authors.forename: R
authors.initials: R
authors.lastname: Bhandavat
authors.forename: A
authors.initials: A
authors.lastname: Feldman
authors.forename: C
authors.initials: C
authors.lastname: Cromer
authors.forename: J
authors.initials: J
authors.lastname: Lehman
authors.forename: G
authors.initials: G
authors.lastname: Singh