Accession Number : AD0250663

Title :   AN INVESTIGATION OF THE THEORETICAL AND PRACTICAL ASPECTS OF THE THERMAL EXPANSION OF CERAMIC MATERIALS

Corporate Author : CORNELL AERONAUTICAL LAB INC BUFFALO NY

Personal Author(s) : MERZ, KENNETH M. ; KIRCHNER, HENRY P. ; SMYTH, HAROLD T.

Report Date : 30 SEP 1960

Pagination or Media Count : 1

Abstract : PREDICTION OF THE THERMAL EXPANSION COEFFICIENT OF PURE SINGLE PHASE CERAMICS WAS ATTEMPTED BY SEVERAL METHODS INCLUDING THE OPENNESS CONCEPT AND ITS APPLICATION IN HOMOLOGOUS SERIES AND THE CALCULATION OF EACH MODE OF LATTICE VIBRATION IN ALKALI HALIDE CRYSTALS (THESE CALCULATIONS ARE NOT YET COMPLETE). SEVEN MATERIALS PREDICTED TO HAVE LOW COEFFICIENTS WERE SYNTHESIZED, TESTED AND FOUND TO HAVE LOW VALUES. THE WORK WAS EXTENDED TO INCLUDE PREDICTION OF THE THERMAL EXPANSION COEFFICIENT OF TWO-PHASE BODIES USING TURNER'S METHOD. TO VERIFY THE RESULTS OF THESE PREDICTIONS, SEVERAL PHASES WERE SYNTHESIZED AND MEASURED AND THE THERMAL EXPANSION COEFFICIENTS OF THREE DIFFERENT TWO-PHASE SYSTEMS WERE INVESTIGATED. A PRELIMINARY INVESTIGATION RESULTED IN SOME UNDERSTANDING OF THE EFFECT OF SOLID SOLUTION ATOMS ON THE THERMAL EXPANSION ANISOTROPY OF ANISOTROPIC CRYSTALS

Descriptors :   *CERAMIC MATERIALS, *THERMAL EXPANSION, ALUMINUM COMPOUNDS, CRYSTAL LATTICES, CRYSTAL STRUCTURE, DETERMINATION, OXIDES, SILICON COMPOUNDS, SOLIDS, SOLUTIONS(MIXTURES).

Distribution Statement : APPROVED FOR PUBLIC RELEASE