• 제목/요약/키워드: powder synthesis

검색결과 1,368건 처리시간 0.03초

산화물 환원공정에 의한 Bi-Sb-Te계 열전분말 합성 (Synthesis of Bi-Sb-Te-based Thermoelectric Powder by an Oxide-reduction Process)

  • 이길근;김성현;하국현;김경태
    • 한국분말재료학회지
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    • 제17권4호
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    • pp.336-341
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    • 2010

  • The present study focused on the synthesis of Bi-Sb-Te-based thermoelectric powder by an oxidereduction process. The phase structure, particle size of the synthesized powders were analyzed using XRD and SEM. The synthesized powder was sintered by the spark plasma sintering method. The thermoelectric property of the sintered body was evaluated by measuring the Seebeck coefficient and specific electric resistivity. The $Bi_{0.5}Sb_{1.5}Te_3$ powder had been synthesized by a combination of mechanical milling, calcination and reduction processes using mixture of $Bi_2O_3$, $Sb_2O_3$ and $TeO_2$ powders. The sintered body of the $Bi_{0.5}Sb_{1.5}Te_3$ powder synthesized by an oxide-reduction process showed p-type thermoelectric characteristics, even though it had lower thermoelectric properties than the sintered body of the $Bi_{0.5}Sb_{1.5}Te_3$ thermoelectric powder synthesized by the conventional melting-crushing method.

  • https://doi.org/10.4150/KPMI.2010.17.4.336 인용 PDF KSCI

금속염용액의 분무열분해에 의한 TiC/Co복합분말 제조 (Synthesis of TiC/Co Composite Powder by the Spray Thermal Conversion of Metallic Salt Solution)

  • 이길근;문창민;김병기
    • 한국분말재료학회지
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    • 제10권4호
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    • pp.228-234
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    • 2003

  • In the present study, the focus is on the synthesis of titanium carbide/cobalt composite powder by the spray thermal conversion process using metallic salt solution as the raw materials. Two types of oxide powders of Ti-Co-O system were prepared by the spray drying of two types of metallic salt solutions : titanium chloride-cobalt nitrate and $TiO_2$ powder-cobalt nitrate solutions. These oxide powders were mixed with carbon black, and then these mixtures were carbothermal reduced under a flowing argon atmosphere. The changes in the phase structure and thermal gravity of the mixtures during carbothermal reduction were analysed using XRD and TG-DTA. In the case of using the titanium chloride-cobalt nitrate solution, it could not be obtained TiC/Co composite powder due to contamination of the impurities during the spray drying of the solution. However, in tile case of using the $TiO_2$ powder-cobalt nitrate scullion, TiC-15 wt. %Co composite powder could be synthesized by the spray thermal conversion process. The synthesized TiC-15 wt. %Co composite powder at 120$0^{\circ}C$ for 2 hours has average particle size of 150 nm.

  • https://doi.org/10.4150/KPMI.2003.10.4.228 인용 PDF KSCI