Abstract: The invention relates to a high-pressure mercury discharge lamp for DC operation at a nominal wattage of more than 1.5 kW. Said high-pressure mercury discharge lamp comprises an anode, at least some areas of which are made of a material containing at least some tungsten, said material having a grain number of more than 200 grains per mm2 and a density of more than 19.05 g/cm3.

Abstract: The invention relates to a high-pressure mercury discharge lamp for DC operation at a nominal wattage of more than 1.5 kW. Said high-pressure mercury discharge lamp comprises an anode, at least some areas of which are made of a material containing at least some tungsten, said material having a grain number of more than 200 grains per mm2 and a density of more than 19.05 g/cm3.

Abstract: A short arc high-pressure discharge lamp (1) for dc operation, includes a discharge vessel (2) that has two necks (4) diametrically opposite each other, in which an anode (26) and a cathode (7) made of tungsten are melted in a gastight manner, and which has a filling made of at least one noble gas and possibly mercury. According to the invention, at least the material of the cathode tip (11) contains lanthanum oxide La2O3 and at least another oxide from the group consisting of hafnium oxide HfO2 and zirconium oxide ZrO2 in addition to the abovementioned tungsten.

Abstract: A component or semifinished product is produced of a material of the group comprising molybdenum, molybdenum alloy, tungsten and tungsten alloy with an average relative density of >98.5% and a relative core density of >98.3%. The material is sintered to a relative density D, with 90%<D<98.5% and a proportion of the closed pores with respect to the overall porosity of >0.8 and also hot-isostatically pressed at a temperature 0.40 to 0.65×solidus temperature and under a pressure of from 50 to 300 MPa. Components produced in this way, used for example as electrodes, have much improved service life characteristics.