Component made from quartz glass e.g. crucible having high thermal stability comprises a mold, part of which is provided with a stabilizing layer having a higher softening temperature than quartz glass

摘要

Component made from quartz glass having high thermal stability comprises a mold, part of which is provided with a stabilizing layer having a higher softening temperature than quartz glass. The stabilizing layer has a different chemical composition than the quartz glass and is produced by thermal spraying. An Independent claim is also included for a process for the production of a quartz glass crucible. Preferred Features: The stabilizing layer contains Al2O3 and/or mullite, hafnium oxide, tantalum oxide, zirconium silicate, rare earth phosphate and rare earth oxide. The layer has a thickness of 50-1000 microns m and consists of several subsequent layers of different chemical composition.