Thermally insulating hollow sphere used in the production of insulating elements has an outer casing with a hollow chamber containing an oxide in powder form formed during sintering in an atmosphere containing oxygen

摘要

Thermally insulating hollow sphere has an outer casing made from molybdenum silicide, tungsten silicide, a metal, an intermetallic phase, a metal alloy or a ceramic. The pressure within the sphere is less than the atmospheric pressure. The hollow chamber of the sphere contains an oxide in powder form formed during sintering in an atmosphere containing oxygen or the oxide is formed on the inner wall of the shell as a layer. An Independent claim is also included for a process for the production of a thermally insulating hollow sphere. Preferred Features: The layer on the inner wall of the shell is made from SiO2, ZrO2, Y2O3 or HfO2. The oxide is Al2O3, MgO, CaO, CrO, TiO2 or Fe3O4. The shell is made from molybdenum silicide or tungsten silicide.