|About this Abstract
||Materials Science & Technology 2012
||Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
||Polymer-Derived Si(B)CN-MWCNT Composite Coatings for High Power Laser Radiometry
||Romil Bhandavat, John Lehman, Chris Cromer, Gurpreet Singh
|On-Site Speaker (Planned)
We demonstrate preparation of polymer-derived Si(B)CN functionalized carbon nanotubes (SiBCN-MWCNT) coatings for use in high power laser thermal detectors. The synthesized nanocomposite material was tested by preparing spray coatings on copper test coupons used as a representation of actual thermal detector surface. These coatings were then exposed to increasing laser powers and varying exposure times (up to 10 seconds) for quantifying their damage threshold and optical absorbance. The Si(B)CN-MWCNT coatings demonstrated significantly higher damage threshold value than conventionally used carbon paint and MWCNTs at 2.5 kW laser (at 10.6 Ám)exposure. Electron microscopy of the irradiated specimen showed that the coating endured high laser-power densities (up to 15 kW/cm2) without significant visual damage. Raman and X-ray photoelectron spectroscopy indicates partial oxidation for irradiation in excess of 12 kW/cm2. The coating’s high optical absorbance is attributed to carbon nanotubes, while the high damage threshold is attributed to the stable Si(B)CN nanodomain structure.