INVESTIGATION TO PRODUCTION MOLYBDENUM CONTAINER TO GROWTH SINGLE CRYSTALS BY DEEP DRAWING PROCESS

A majority of modern electronic and optical devices makes use of the physical properties of single crystals. Such crystals may be organic, inorganic or semimetallic ,in nature, and they are usually prepared by synthetic methods. When possible the growth of a material from its own melt is the most convenient way of producing single crystals, two of the most widely used techniques for melt growth being the Bagdasarov, Bridgman-Stockbarger and the Czochralski methods. Common to these and to other methods is a container or crucible to hold the molten material. Clearly a useful crucible material must be chemically compatible with the particular substance to be contained. Molybdenum container is a suitable facility to growth single crystals, because its refractory property and chemical stability, but it is a hardly deformed material which its production require special techniques and technology. In this paper, deep drawing process technology for production boat shape molybdenum container for growing single crystals by horizontal direct growth is discuss. Mechanical properties of sheet molybdenum have been examined and technological features of shaping as well as the temperature regime and strain rate have been researched. Also, optimum conditions to achieve physical kinetics at the crystallization front were considered