Boron nitride composites by chemical vapor deposition

Technical Report · Mon Sep 01 04:00:00 EDT 1975

DOI:https://doi.org/10.2172/4146652· OSTI ID:4146652

Pierson, H. O.

Composites of boron nitride (BN) were made by the chemical vapor deposition of a BN matrix on a BN felt fiber substrate. Reactant gases were boron trifluoride and ammonia. The composites had a relatively high density (1.70 g/cm$sup 3$), a crystallite size L/sub C/ = 150 A, and an interlayer spacing d$sub 002$ = 3.35 A. Measurements of elastic modulus and thermal conductivity and expansion showed some anisotropy as a result of the preferred fiber orientation of the substrate. (7 tables, 5 fig) (auth)

• Research Organization: Sandia Labs., Albuquerque, NM (United States)
• Sponsoring Organization: US Energy Research and Development Administration (ERDA)
• DOE Contract Number: AT(29-1)-789
• NSA Number: NSA-33-007732
• OSTI ID: 4146652
• Report Number(s): SAND--75-0130
• Country of Publication: United States
• Language: English

Related Subjects

*BORON NITRIDES-- CHEMICAL VAPOR DEPOSITION
360201* --Materials--Ceramics
Cermets & Refractories-- Preparation & Fabrication
ANISOTROPY
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
DENSITY
ELASTICITY
FIBERS
MATRIX MATERIALS
N50120* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Preparation & Fabrication
N50320 --Metals
Ceramics
& Other Materials--Plastics & Other Materials--Preparation & Fabrication
THERMAL CONDUCTIVITY
THERMAL EXPANSION