Accession Number:

ADA563960

Title:

Development of a 30 kW Inductively Coupled Plasma Torch Facility for Advanced Aerospace Material Investigations

Descriptive Note:

Final rept. Aug 2008-Nov 2011

Corporate Author:

VERMONT UNIV BURLINGTON DEPT OF MECHANICAL ENGINEERING

Report Date:

2012-02-21

Pagination or Media Count:

88.0

Abstract:

A 30 kW Inductively Coupled Plasma ICP Torch for testing high-temperature materials for aerospace applications has been designed, constructed, and made operational at the University of Vermont. A key advantage of the inductive heating approach to creating the plasma is the electrodeless operation, which avoids the copper contamination from electrode attachment of traditional arc heaters. Heat flux probes have been fabricated and used to characterize the heating rates. In addition, sample holders for both shape-stable and ablative material samples have been developed for use in the facility. Surface temperature measurements using a two-color optical pyrometer have been demonstrated. Tests have been conducted on graphite, SiC, and ZrB2-SiC samples. Current test capabilities for continuous operation include heat flux levels up to 120 Wcm2 for air and nitrogen plasmas at pressures between 100 and 200 torr, and surface temperatures to 1800 K for graphite. A unique feature of the ICP Torch Facility is the inclusion of optical access to allow emission and laser-spectroscopic measurements in the plasmasurface reaction zone. Emission measurements have been used to track the evolution of boron depletion and silicon-oxide layer formation over a UHTC test sample.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE