Chemical vapor deposition of TiB/sub 2/ on graphite

Conference · Sun Jan 01 04:00:00 EST 1978

OSTI ID:6376380

Pierson, H O; Randich, E; Mattox, D M

This study is an experimental investigation of the coating of graphite with TiB/sub 2/ by chemical vapor deposition (CVD) using the hydrogen reduction of BCl/sub 3/ and TiCl/sub 4/ at 925/sup 0/C and 1 atm. Reasonable matching of the thermal expansion of TiB/sub 2/ and graphite was necessary to eliminate cracking. A suitable graphite was POCO DFP-1. Adhesion was improved by having a slightly rough graphite surface. Heat treatment at 2000/sup 0/C and above resulted in a certain degree of diffusion. No melting or solid phases other than TiB/sub 2/ and graphite were detected up to 2400/sup 0/C. The coatings showed no failure when repeatedly submitted to an electron beam pulse of 2 KW/cm/sup 2/ for 0.8 sec.

• Research Organization: Sandia Labs., Albuquerque, NM (USA)
• DOE Contract Number: EY-76-C-04-0789
• OSTI ID: 6376380
• Report Number(s): SAND-78-1794C; CONF-781064-1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
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BORIDES
BORON COMPOUNDS
CARBON
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COATINGS
CRACKS
DEPOSITION
DIFFUSION
ELEMENTS
GRAPHITE
NONMETALS
SURFACE COATING
THERMONUCLEAR REACTOR MATERIALS
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE