Accession Number : AD0428006


Title :   INVESTIGATION OF BORIDE COMPOUNDS FOR VERY HIGH TEMPERATURE APPLICATIONS Part 1


Descriptive Note : Technical Report,01 Apr 1962,30 Sep 1963


Corporate Author : ManLabs Inc Cambridge United States


Personal Author(s) : Kaufman,Larry ; Clougherty,Edward V


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/428006.pdf


Report Date : 01 Dec 1963


Pagination or Media Count : 394


Abstract : A comprehensive study of the properties of high purity well characterized samples of TiB2, Zrb2, HfB2, NbB2, and TaB2 was performed. Floating zone refining and high pressure hot pressing were used to prepare single crystal and polycrystalline material respectively. An investigation of the sintering mechanism of TiB2 was performed. Powder purification procedures by acid leaching and vacuum heating were examined. Properties measured included lattice parameter, X-ray thermal expansion, linear thermal expansion, electrical resistivity and microhardness. These quantities were obtained for materials which satisfied the sample requirements for the various experiments. Measurements were generally performed between room temperature and 1000 C. Thermal conductivity measurements between 1000 and 2000 C are in progress.


Descriptors :   BORIDES , HIGH TEMPERATURE , SCIENTIFIC RESEARCH , PREPARATION , ZONE MELTING , HYPERBARIC CONDITIONS , SCIENTIFIC RESEARCH , HAFNIUM COMPOUNDS , NIOBIUM COMPOUNDS , TITANIUM COMPOUNDS , ZIRCONIUM COMPOUNDS , CRYSTAL LATTICES , THERMAL EXPANSION , ELECTRICAL RESISTANCE , HARDNESS , THERMAL CONDUCTIVITY , SPECIFIC HEAT , HEAT OF FORMATION , OXIDATION , ADDITIVES , CHEMICAL ANALYSIS , TRANSITION METALS , TABLES(DATA)


Distribution Statement : APPROVED FOR PUBLIC RELEASE