Accession Number : AD0265625


Title :   INVESTIGATION OF INTERMETALLIC COMPOUNDS FOR VERY HIGH TEMPERATURE APPLICATIONS


Corporate Author : BRUSH BERYLLIUM CO CLEVELAND OH


Personal Author(s) : BOOKER, JONATHAN ; PAINE, ROBERT M ; STONEHOUSE, A J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/265625.pdf


Report Date : Apr 1961


Pagination or Media Count : 146


Abstract : Intermetallic beryllides from the systems Ta-Be, W-Be, and Hf-Be along with the disilicides of W, Ta, and Mo, were screened for compounds capable of serving as structural materials at temperatures above 2500 F. The compounds studied were TaBe12, Ta2Be17, Hf2Be21, MoSi2, TaSi2, and WSi2. An investigation of the rates of oxidation of intermetallic beryllides was initiated. The oxidation of TaBe12, Hf2Be21, ZrBe13, and Ta2Be17 in the range 2300 to 2750 F was found to obey an exponential rate law which was cubic or a higher power rate law. In most cases, the cubic rate law applied. The products of the oxidation of ZrBe13 at 2500 F were identified as Zr2Be17 and BeO. Tentative activation energies for a cubic rate process were calculated for TaBe12 and Hf2Be21.


Descriptors :   *REENTRY VEHICLES , *SILICIDES , *REFRACTORY MATERIALS , *BERYLLIUM COMPOUNDS , *INTERMETALLIC COMPOUNDS , *CERMETS , GUIDED MISSILES , MECHANICAL PROPERTIES , ZIRCONIUM COMPOUNDS , HAFNIUM COMPOUNDS , PREPARATION , MATERIALS , HIGH TEMPERATURE , TUNGSTEN COMPOUNDS , TANTALUM COMPOUNDS , HEAT RESISTANT ALLOYS , POWDER METALS , MOLYBDENUM COMPOUNDS , TEST METHODS , TEST EQUIPMENT , PHASE STUDIES , IMPACT SHOCK , OXIDATION , THERMAL EXPANSION , THERMAL CONDUCTIVITY


Subject Categories : Inorganic Chemistry
      Ceramics, Refractories and Glass
      Guided Missile Reentry Vehicles


Distribution Statement : APPROVED FOR PUBLIC RELEASE