Thermoelectric composite and preparation method thereof
A technology of composite materials and thermoelectric materials, applied in the field of thermoelectric composite materials and their preparation
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Embodiment 1
[0082] 2.0g of synthesized barium filled skutterudite powder Ba 0.22 co 4 Sb 12 Disperse in 25mL ethanol solution, the volume concentration of the ethanol solution is 85%, the ultrasonic dispersion time is 30min, then the suspended powder is magnetically stirred, and butyl titanate (Ti(OC 4 h 9 ) 4 ) ethanol solution (the concentration of butyl titanate is 0.03mol / L) 1.9mL, hydrolyzed while stirring, suction filtered after complete hydrolysis, then dried in a vacuum oven at 120°C for 2h, and then placed in a tube furnace In Ar-7%H 2 Heat treatment at 470 °C for 2 h in the atmosphere to obtain Ba 0.22 co 4 Sb 12 / 0.4vol.%TiO 2 The composite powder is then rapidly sintered by spark plasma technology, the sintering temperature is 590°C, the holding time is 10min, and the pressure is 60MPa. Prepared Ba 0.22 co 4 Sb 12 / 0.4vol.%TiO 2 The phase analysis, structure and thermoelectric properties of the composites are shown in the attached Figure 3-9 shown.
Embodiment 2
[0084] 2.0g of synthesized barium filled skutterudite powder Ba 0.22 co 4 Sb 12 Disperse in 30mL ethanol solution, the volume concentration of the ethanol solution is 95%, the ultrasonic dispersion time is 50min, then the suspended powder is stirred, and butyl titanate (Ti(OC 4 h 9 ) 4 ) ethanol solution (the concentration of butyl titanate is 0.02mol / L) 5.7mL, hydrolyzed while stirring. Heat treatment in a tube furnace at 490 °C for 1 h in Ar atmosphere to obtain Ba 0.22 co 4 Sb 12 / 0.8vol.%TiO 2 The composite powder is then rapidly sintered by spark plasma technology, the sintering temperature is 605°C, the holding time is 8min, and the pressure is 50MPa. Prepared Ba 0.22 co 4 Sb 12 / 0.8vol.%TiO 2 The highest ZT value of the composite material is 1.02 (850K)
Embodiment 3
[0086] 2.0g of synthesized barium filled skutterudite powder Ba 0.22 co 4 Sb 12 Disperse in 35mL deionized water, ultrasonic dispersion time is 20min, then the suspended powder is stirred, and butyl titanate (Ti(OC 4 h 9 ) 4) ethanol solution (the concentration of butyl titanate is 0.04mol / L vol.%) 6.5mL, hydrolyze while stirring. , then placed in a tube furnace at N 2 Heat treatment at 450 °C for 6 h in the atmosphere to obtain Ba 0.22 co 4 Sb 12 / 1.8vol.%TiO 2 The composite powder is then rapidly sintered by spark plasma technology, the sintering temperature is 585°C, the holding time is 40min, and the pressure is 80MPa. Prepared Ba 022 co 4 Sb 12 / 1.8vol.%TiO 2 At room temperature (300K), the Seebeck coefficient reaches -119VK -1 .
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