IDEA #38PQSB NEW MANUFACTURING TECHNOLOGY FOR DEVELOPMENT OF MATERIALS FOR USE IN THERMOELECTRIC CONVERTERS OF ENERGY

NEW MANUFACTURING TECHNOLOGY FOR DEVELOPMENT OF MATERIALS FOR USE IN THERMOELECTRIC CONVERTERS OF ENERGY Synthesis of the solid solution from initial components Crushing (pulverization) of the synthesized material in thermoelectric material due Description The technology of preparing of polycrystalline Bi2Te3- Sb2Te3 and Bi2Te3-Bi2Se3 system samples with the thermoelectric parameters close to parameters of single crystalline samples have been developed. In this method an opportunity of orientation of grains (formation of a texture) to plastic deformation under the extrusion process is used, as a result of which the structure of the material comes nearer to structure of a single crystalline samples. With use of the high-strength polycrystalline samples of Bi2Te3-Sb2Te3 and Bi2Te3- Bi2Se3 thermoelectric parameters close to parameters of single crystalline samples of these materials have been received. systems with high enough technology new developed Innovative Aspects and Main Advantages A new technology of preparing of a polycrystalline thermoelectric material high thermoelectric efficiency and high mechanical durability has been developed. This was achieved by use of extrusion technology for formation of the texture in a polycrystalline sample and choosing optimal grain sizes, which enabled to obtain polycrystalline Bi2Te3-Sb2Te3 and Bi2Te3-Bi2Se3 systems materials with the thermoelectric parameters close to parameters of single crystalline samples, as well as achieve considerably higher mechanical durability of a material in comparison with single crystals. The developed technology due to technological simplicity and an opportunity of manufacturing of thermoelements of the necessary dimensions as well as high mechanical durability and the material obtained is of interest for manufacture of various thermoelectric converters. thermoelectric characteristics of Areas of Application Material for thermoelectric converters of the energy (thermoelectric coolers, thermoelectric generators, etc.) Selection of the fractions with 1000-600 μm grain sizes Manufacturing briquettes of ∅ 30 mm by the method of cold pressing Carrying out of the extrusion process (pressing-out of the briquettes heated up to a plastic condition through an aperture of ∅ 6 mm) Thermal processing of the obtained rods of thermoelectric material within 2 hours at temperature ~ 600 K Cutting of rods to thermoelements Fig.1. The block diagram of the process of reception thermoelectric material by the extrusion method Stage of Development Manufacturing techniques of highly effective converters of energy on the basis of received mechanically durability thermoelectric materials with high thermoelectric quality factor have been developed and pilot samples have been made on their basis. Contact Details Institute of Physics Contact person: Barkhalov Barkhal Shaban oglu Address: 33, H. Javid Avenue AZ1143, Baku, Azerbaijan Tel.: (994 13) 432 5146 Fax: (994 12) 447 0456 E-mail: bbarhal@rambler.ru, bbarhal@mail.ru