Accession Number : ADD012352

Title :   Method for Preparing PB-Beta' '-Alumina Ceramic.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Hellstrom,Eric E

Report Date : 29 Apr 1986

Pagination or Media Count : 4

Abstract : A process is disclosed for preparing impermeable, polycrystalline samples of Pb-beta-alumina ceramic from Na-beta-alumina ceramic by ion exchange. The process comprises two steps. The first step is a high-temperature vapor phase exchange of Na by K, followed by substitution of Pb for K by immersing the sample in a molten Pb salt bath. The result is a polycrystalline Pb-beta-alumina ceramic that is substantially crack-free.

Descriptors :   *PATENTS, *CERAMIC MATERIALS, *MANUFACTURING, LEAD(METAL), ALUMINUM OXIDES, POLYCRYSTALLINE, PERMEABILITY, ION EXCHANGE, VAPOR PHASES, SODIUM, POTASSIUM, SUBSTITUTES, FUSED SALTS, BATHS, IMMERSION, HIGH TEMPERATURE

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE