Accession Number : ADA131687

Title :   Cold Sintering - A New Powder Consolidation Process.

Descriptive Note : Technical rept.,


Personal Author(s) : Gutmanas,E Y ; Lawley,A

PDF Url : ADA131687

Report Date : Jul 1983

Pagination or Media Count : 17

Abstract : The plastic deformation of powder particles in a high pressure gradient at ambient temperature results in green densities close to theoretical. Physical contact of freshly formed oxide-free surfaces leads to strong particle-particle bonding; this phenomenon is called cold sintering. High strength levels can be obtained in metals, alloys, composites, ionic and ionic-covalent solids by cold sintering. Subsequent heat treatment of cold sintered material, at temperatures significantly lower than those used in conventional sintering, results in excellent combinations of strength and ductility. Thus, cold sintering offers the potential for retaining metastable constituents, fine-scale microstructures and small precipitates in rapidly solidified powders. Interface reactions or dissolution of phases in metal matrix composites can also be reduced or eliminated. Details of the compacting response, microstructure and mechanical properties of cold sintered and heat treated high speed tool steel and super-alloy powders are presented. Cold sintering characteristics are understood in terms of the interplay of particle shape and particle deformation. Possible cold sintering processing routes of commercial interest are discussed and the limitations of this new technology considered. (Author)

Descriptors :   *Powders, *Powder metallurgy, *Tool steel, *Superalloys, *Plastic deformation, Sintering, Mechanical properties, Atomization, Water, Compacting, High pressure, Microstructure, Particles, Metastable state, Strength(Mechanics), Ductility, Solidification, Quick reaction

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE