Device and method for the production of high-melting glass materials or glass ceramic materials or glass material or glass ceramic material

摘要

The invention relates to a device for the production of high-melting glass materials or high-melting glass ceramic materials, comprising a vessel for accommodating molten glass and a container that accommodates the vessel, whereby the vessel has a tubular outlet. According to the invention, the device is characterised by the fact that the vessel and a first section of the tubular outlet if formed of iridium or a material with a high iridium content, whereby the container is designed to accommodate the vessel and the first section of the tubular outlet under a protective gas atmosphere. The invention also relates to a corresponding method. The molten glass is shaped into a formed part in a discontinuous operation. The choice of the material for the vessel used as the crucible allows the attainment of high temperatures according to the invention which enables glass materials or glass ceramic materials with a much higher spectral transmission in the visible wavelength range. The use of an inert protective gas enables the prevention of unwanted oxide formation on the vessel and the tubular outlet. According to the invention, the glass can be used as a transitional glass between types of glass with very different coefficients of thermal expansion.