Accession Number : AD0831887

Title :   SOLID STATE DIFFUSION BONDED TANTALUM ALLOY HONEYCOMB PANELS.

Descriptive Note : Final technical rept. 1 Jun 65-30 Nov 67,

Corporate Author : NORTHROP CORP HAWTHORNE CA NORAIR DIV

Personal Author(s) : Hugill, D. B. ; Shabarack, J.

Report Date : MAR 1968

Pagination or Media Count : 223

Abstract : A program is described for the development of solid state diffusion bonding technology for production of tantalum alloy (T111) honeycomb panels suitable for either hot structural or heat shield applications in aerospace environments. The investigation and selection of appropriate intermediate materials to effect joining at relatively low temperatures and pressures suitable to the panel configurations is discussed. Emphasis was placed on methods suitable for reasonably low-cost processing. Specific manufacturing problem areas encountered, such as forming, welding, and intermediate application, are discussed. Heating, atmosphere control, and pressure application requirements are described and actions taken to satisfy these requirements are reported. A survey of oxidation protective coatings for tantalum alloys is presented with the actual coatings and procedures used in the program being discussed. Structural testing techniques used in evaluating the integrity of the manufactured honeycomb panels are described. Standard analytical procedures employed in determining failure modes and predicted failure stresses are presented. (Author)

Descriptors :   *DIFFUSION BONDING), (*SANDWICH PANELS, (*TANTALUM ALLOYS, SANDWICH PANELS), HONEYCOMB CORES, SANDWICH CONSTRUCTION, TUNGSTEN ALLOYS, HAFNIUM ALLOYS, FOILS(MATERIALS), MANUFACTURING, HEAT SHIELDS, CORROSION INHIBITION, COATINGS, SILICON COATINGS, SILICIDES, MOLYBDENUM COMPOUNDS, TUNGSTEN COMPOUNDS, STRUCTURAL PROPERTIES, RECRYSTALLIZATION, MECHANICAL PROPERTIES.

Subject Categories : Properties of Metals and Alloys
      Fabrication Metallurgy
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE