Patent ID: 11958781
Assignee: SICHUAN UNIVERSITY
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  Y | IPC C

Claim 2:
3. A preparation method for the potassium sodium bismuth niobate tantalate zirconate ferrite ceramic with non-stoichiometric Nb5+ according to claim 1, comprising the following steps:
(1) preparing potassium sodium bismuth niobate tantalate zirconate ferrite ceramic powder by a solid phase method comprising
weighing and proportioning raw materials respectively according to the formula, placing the raw materials in a polyurethane ball milling pot and adding a dispersion medium, placing the raw materials in a planetary ball mill, conducting ball milling until the raw materials are mixed uniformly to form a slurry, placing the uniformly mixed slurry in a stainless steel basin, baking the uniformly mixed slurry under a drying lamp to obtain a dried powder, putting the dried powder into a crucible, raising the temperature in a programmed temperature control box furnace to 850° C.-950° C., and pre-sintering the dried powder for 6 hours to obtain a pre-sintered powder;
(2) secondary ball milling by
placing the pre-sintered powder prepared in step (1) in the polyurethane ball milling pot and adding the dispersion medium again, placing the dispersed pre-sintered powder in a planetary ball mill and conducting secondary ball milling to form a second slurry, and baking the second slurry under a drying lamp to obtain a dried ceramic powder;
(3) granulating and molding by
fully mixing the dried ceramic powder prepared in step (2) with a 5-10 wt % PVA binder, conducting granulating to form uniformly distributed particles, and pressing the particles into preformed ceramic green pellets with a diameter of 10 mm and a thickness of 1 mm under a uniaxial pressure of 10-15 MPa;
(4) binder removal and sintering by
removing binder of the preformed ceramic green pellets prepared in step (3) at a temperature of 500° C.-550° C., and sintering the ceramic green pellets at a temperature of 1090° C.-1120° C. for 3-5 hours to prepare sintered ceramic pellets; and
(5) silvering and polarization by
brushing the sintered ceramic pellets with a silver paste with a concentration of 5-15 wt %, sintering the ceramic pellets again at 700° C.-800° C. for 10-15 minutes to prepare a sample, and conducting polarization in an oil bath at a temperature between room temperature and 120° C. to prepare piezoelectric ceramics.