Accession Number : AD0728234

Title :   Development of Porous Beryllium by the Hot Isostatic Pressing of Plasma-Spheroidized Powder.

Descriptive Note : Final technical rept. 1 Jun 69-15 Dec 70,

Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OHIO COLUMBUS LABS

Personal Author(s) : Speidel,Edward O.

Report Date : APR 1971

Pagination or Media Count : 58

Abstract : Spheroidal beryllium powder in the nominal 40 to 50-micron size range was prepared from irregular starting material by plasma spheroidization. An effort was made to develop hot-isostatic-pressing parameters necessary to reproducibly fabricate porous beryllium billets from this powder possessing uniform permeabilities of 0.1, 0.01, and 0.001 darcy plus or minus 10 percent. In the program, no billets were produced to the specified permeability of 0.1, 0.01, or 0.001 darcy plus or minus 10 percent. Only one full-size billet, having a permeability of 0.017 darcy, was within the range of 0.1 to 0.001 darcy. Reproducibility of the process was not established in this range as a second billet produced under identical conditions had a similar density but its permeability could not be determined. Data from billets outside the specified permeability range indicated that hot isostatic pressing of spherical powders has potential for the reproducible fabrication of porous beryllium billets as well as for achieving uniformity of permeability within the billets. However, development of a process to produce spherical powder in reasonable quantity would be required. The tensile strength, compressive strength, and modulus of rupture decreased linearly with decreasing density. Anticipated values of these properties, based on extrapolation, for permeabilities within the range of 0.1 to 0.001 darcy would be 5 to 15 x 1000 psi, 20 to 45 x 1000 psi, and 10 to 25 x 1000 psi, respectively. (Author)

Descriptors :   (*BERYLLIUM, *POROUS METALS), (*HOT PRESSING, BERYLLIUM), POWDER METALS, SPHERES, PERMEABILITY, MECHANICAL PROPERTIES

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE