Investigation Of Intermetallic Compound For Very High Temperature Applications

Item

Title
Investigation Of Intermetallic Compound For Very High Temperature Applications
Date
1961
Index Abstract
Contrails and DTIC Condensed
Photo Quality
Incomplete
Report Number
WADD TR 60-889
Creator
Booker, Jonathan
Paine, Robert M.
Stonehouse, A. James
Corporate Author
Brush Beryllium Company
Laboratory
Materials Laboratory
Extent
133
Identifier
AD0265625
AD0265625
Access Rights
OTS
Distribution Classification
1
Contract
AF 33(616)-6540
DoD Project
7350
DoD Task
73500
DTIC Record Exists
Yes
Distribution Change Authority Correspondence
None
Report Availability
Full text available by request
Date Issued
1961-04
Abstract
Intermetallic beryllides from the systems tantalum-beryllium, tungsten-beryllium, and hafnium-beryllium along with the disilicides of tungsten, tantalum, and molybdenum, 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. The preparation, fabrication, oxidation resistance, and thermal-shock resistance are discussed. Values are given for the transverse-rupture strengths, impact resistance, ,mean-linear coefficients of thermal expansion, enthalpy, specific heat, and thermal conductivity. 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.
Publisher
Wright-Patterson Air Force Base, OH : Aeronautical Systems Division, Air Force Systems Command, United States Air Force
Distribution Conflict
No
Type
report
Provenance
Lockheed Martin Missiles & Fire Control
Subject
Refractory Materials
High Temperature
Reentry Vehicles
Silicides
Beryllium Compounds
Intermetallic Compounds
Cermets
Guided Missiles
Mechanical Properties
Zirconium Compounds
Hafnium Compounds
Preparation
Materials
Tungsten Compounds
Tantalum Compounds
Heat Resistant Alloys
Powder Metals
Molybdenum Compounds
Test Methods
Test Equipment
Phase Studies
Impact Shock
Oxidation
Thermal Expansion
Thermal Conductivity