CARBONIZATION OF PLASTICS AND REFRACTORY MATERIALS RESEARCH PROGRAM. Quarterly Progress Report No. 5, January 1, 1961-March 31, 1961

Technical Report · Fri Mar 31 04:00:00 EST 1961

OSTI ID:4064903

Coffman, J A; Coulson, K L; Kibler, G M

Carbonization of Plastics. The carburization rate of synthetic phenol samples in an arc image furnace was investigated. X-ray diffraction examination of the carbonized ends indicated some difference in ease of graphitization between polyphenylene and phenolic resin. Phenolic resin samples containing powdered W, Nb, etc., gave evidence of carbide formation. Gases evolved from phenolic and epoxy resins at 200 to 900 deg C were collected and subjected to mass spectrometric analyses. The effects of semi-carbonized filler material on the thermal conductivity of polyethylene were investigated and found to be rather small. Elemental analyses were carried out on moded phenolic disks heated in a thermogravimetric apparatus to temperatures of 500 to 900 deg C. Vapor Pressure of Refractory Materials. The vapor pressure of HfC was measured at temperatures from 2533 to 3138 deg C; lattice constant measurements indicated congruent vaporization. A WC specimen was heated to a total weight loss of approximately 2.5% of its initial weight; an inner core of WC with W/sub 2/C near the sunface was found. The free energies of formation of ZrC and TiC were determined to be -- 38.755 kcal/mole at 2740 deg C snd --35.15 kcal/mole at 2220 deg C, respectively. Spectral Emissivities of Refractory Materials. The computed normal emissivities of ZrC, TaC, W, Ta, and Mo are given. The role of cross-over points is discussed. Experimental data are reported for Mo, W, and WC specimens. (D.L.C.)

• Research Organization: General Electric Co. Flight Propulsion Lab. Dept., Cincinnati
• NSA Number: NSA-15-019844
• OSTI ID: 4064903
• Report Number(s): NP-10151
• Country of Publication: United States
• Language: English

Related Subjects

CARBIDES
COMBUSTION
DIFFRACTION
ELECTRIC ARCS
EMISSION
EVAPORATION
EXCITATION
FURNACES
GASES
GRAPHITE
HAFNIUM CARBIDES
HEATING
HIGH TEMPERATURE
INTERMETALLIC COMPOUNDS
LABORATORY EQUIPMENT
LATTICES
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM
NIOBIUM
PHENOLS
POLYETHYLENES
POLYMERS
POWDERS
PRESSURE
REFRACTORIES
RESINS
SPECTRA
SPECTROSCOPY
SURFACES
TANTALUM
TANTALUM CARBIDES
TEMPERATURE
THERMAL CONDUCTIVITY
TITANIUM CARBIDES
TUNGSTEN
TUNGSTEN CARBIDES
VAPORS
VARIATIONS
WEIGHT
X RADIATION
ZIRCONIUM CARBIDES