Hollow spheres for use as light-weight construction material are of sintered inorganic material and have a functional layer which can be rendered flowable or plastically- and/or elastically-formable

摘要

Hollow spheres made from sintered inorganic material have their shells at least partly formed of a solid functional layer which is of a material which can be rendered flowable or plastically- and/or elastically-formable by a physical and/or chemical treatment. Independent claims are also included for the following: (i) production of the spheres by applying a fluid containing a liquid binder and metallic powder to a heat-volatizable carrier so as to form a covering which is then dried and sintered, the novel features being that (a) a decomposable additive is present in the binder/powder mixture in dissolved or colloidal form; (b) during sintering in an oxidizing atmosphere the solid residue of the additive forms further binder components for the metal powder; and (c) after the sintering a functional layer is applied to the shell; and (ii) production of light-weight construction elements by filling the spheres into a mold or the outer part of a construction element and then physically and/or chemically treating make the functional layer plastically- and/or elastically-formable, followed by adhesively fixing the spheres.