Process for preparing silicon-germanium-based thermoelectric material by liquid quenching cooperated with spark plasma sintering

Process for preparing silicon-germanium-based thermoelectric material by liquid quenching cooperated with spark plasma sintering

  • CN 101,307,393 B
  • Filed: 04/15/2008
  • Issued: 07/11/2012
  • Est. Priority Date: 05/14/2007
  • Status: Active Grant
First Claim
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1. a liquid quench combines discharge plasma sintering to prepare the method for silicon-germanium-based thermoelectric material, it is characterized in that, comprises following each step:

  • (1) by the elemental composition in the selected silicon Germanium based alloys, in vacuum or inert gas environment, the above temperature of fusing point that is heated to alloy is incubated 30Min~

    6h, obtains SiGe base alloy;

    Described silicon Germanium based alloys composition includes Si content 50~

    90at%, Ge content 10~

    50at%;

    (2) alloy that step (1) is obtained is packed in the induction heater of liquid quench equipment, and heating is with its fusing;

    (3) in protectiveness gas atmosphere, the fused alloy is carried out rapid solidification handle, obtain alloy thin band, wherein, rapid solidification is handled any method in the method that adopts single-roller method and double roller therapy, speed of cooling>

    =10 5K/s;

    (4) alloy thin band that step (3) is obtained is milled and is ground into powder, adopts the discharge plasma sintering method, with the fine and close block thermoelectric material of powder sintered one-tenth of alloy;

    Become the process of fine and close block thermoelectric material to be alloy powder sintered,, carry out sintering together with mould with the compacting in the graphite jig of packing into of the powder of alloy;

    800~

    1200 ℃

    of sintering temperatures;

    20~

    200 ℃

    /Min of heat-up rate, sintering time 1~

    30Min, pressure are 30~

    100MPa.

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