【摘要】 以Co(NO3)2·6H2O、Ca(NO3)2·4H2O为原料,NaOH为沉淀剂,采用化学共沉淀方法制备了前驱物。该前驱物预烧后,利用SPS进行烧结获得纯相Ca2Co2O5块体。分别采用DTA TG、XRD和SEM对前驱体的热分解过程、Ca2Co2O5的形成过程进行了表征,并对其热导率进行了测试。结果表明:在pH=13.20获得所需化学计量比的前驱物。该前驱物在700～800℃预烧2h后,采用SPS烧结。烧结温度为800℃,压力30MPa,保温时间5min,可以获得纯相Ca2Co2O5块体。断口形貌为层状,晶粒长约1.4μm。热导率随温度的升高而降低。更多还原

【Abstract】 The precursor of Ca₂Co₂O₅ was prepared by coprecipitating method using stoichiometric amounts of Co（NO₃）₂·6H₂O, Ca（NO₃）₂·4H₂O, and NaOH as precipitation agent. After heat treatment, the precursor was sintered by SPS process. ICP, DTA-TG, XRD and SEM are used to determine the decomposition in the process of heat treatment and the formation of Ca₂Co₂O₅. In order to obtain stoichiometric precursor, the ICP results show the ended pH value was 13.2. The precursor was heat treated in the range of 700℃ to 800℃ for 2h, and then sintered by SPS. XRD patterns show that the pure phase Ca₂Co₂O₅ was produced when sintering temperature was 800℃, the pressure was 30MPa, and last for 5min. SEM shows that the microstructure of the production was plate-like about 1.4μm. The thermal conductivity decreases with increasing temperature up to 800℃.更多还原