Preparation method of CaCu3Ti4O12 ceramic
A technology of ceramics and cuo, applied in the field of preparation of CaCu3Ti4O12 ceramics, can solve the problems of secondary growth of crystal grains, ceramic properties, influence of ceramic structure, densification, deterioration, etc., to reduce high temperature and low frequency dissipation, uniform particle size, structure dense effect
Inactive Publication Date: 2011-09-07
NORTHWESTERN POLYTECHNICAL UNIV
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The invention discloses a preparation method of CaCu3Ti4O12 (CCTO) ceramic, and the method can be used for solving the technical problem of high dielectric loss caused by the existing preparation method of the CaCu3Ti4O12 ceramic. The technical scheme of the invention is as follows: a casting technology is adopted to prepare a CCTO ceramic wafer, then a two-step sintering technology is adopted to obtain a ceramic material with dense structure and uniform particle size; and according to the changes of the dielectric constant epsilon r and dielectric loss tan delta of the CCTO ceramic along with the testing frequency and the temperature, CCTO crystalline integrity, grain boundary, defect and other aspects can directly influence the high dielectric constant. In addition, at the room temperature and 1KHz, when the sintering temperature is 1025-1100 DEG C and heat preservation is performed for 10 hours, the epsilon r of the CCTO ceramic prepared through two-step sintering is 104, which is more or less the same with the value reported in literatures; and the dielectric loss is reduced from 0.3-0.6 reported in the background art to 0.03, which shows that the concentration of oxygen vacancies can be reduced by adopting the two-step sintering method. Therefore, the high-temperature low-frequency dissipation of the ceramic can be significantly reduced; and the lattice distortions can be reduced along with the increase of the heat preservation time.
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