Piezoelectric ceramic based on Nb-Ni-PTZ trivalent doping and preparation method thereof

Abstract

The invention discloses piezoelectric ceramic based on Nb-Ni-PTZ trivalent doping. The piezoelectric ceramic comprises raw materials in mole percentage as follows: Pb(Me1 / 2Nb2 / 3)x(Ni1 / 3Nb2 / 3)y(Zr0.3Ti0.7)(1-x-y)O3, wherein Me is a trivalent element, x is larger than 0 and smaller than 0.1, and y is larger than 0.2 and smaller than 0.6. The preparation method of the ceramic comprises steps as follows: the raw materials are mixed and ball-milled, and powder is dried and screened with a sieve; the screened powder is compacted, pre-sintered at the temperature of 850-1,000 DEG C for 2 h and then cooled; the cooled powder is ball-milled secondarily, dried and screened, 5wt%-7wt% of paraffin is added for granulation, screening is performed, and a ceramic wafer is pressed under the pressure of 5 Mpa; the ceramic wafer is placed in a crucible, sealed and sintered at the temperature of 1,200 DEG C, the temperature is kept for 2 h, and natural cooling is performed; the cooled ceramic wafer is cleaned, silver paste is printed on upper and lower surfaces of the ceramic wafer, the ceramic wafer is kept at the temperature of 800 DEG C for 30 min, naturally cooled and then placed in silicone oil to be heated to 50-70 DEG C, and a DC electric field of 2 kV / mm is applied for polarization for 30 min. The piezoelectric ceramic is high in dielectric and piezoelectric constant and stable in performance, and the preparation technology is simple, low in cost and beneficial to industrial production.

Description

technical field [0001] The invention relates to the field of high dielectric constant piezoelectric ceramic materials, in particular to a preparation method of a high dielectric constant piezoelectric ceramic formula based on trivalent doping of niobium nickel zirconate lead titanate. Background technique [0002] Piezoelectric ceramic material is a kind of functional ceramic material, which can convert mechanical energy and electrical energy into each other. This performance is called piezoelectric performance. In addition to piezoelectric properties, piezoelectric ceramics also have dielectric properties and mechanical properties. Due to these excellent comprehensive properties of piezoelectric ceramic materials, coupled with its simple, stable and reliable preparation process, it is widely used in various aspects of social life, such as in the field of electronic materials. Pb(Ni 1 / 3 Nb 2 / 3 ) series piezoelectric ceramic materials have been paid attention and studied b...

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Problems solved by technology

Katrin Benkert and Morgane Radanielina et al. Doped PNZT-PNN with high piezoelectric constant SrCO using niobite precursor method 3 Preparation of piezoelectric ceramics (ε r >4000;K p >60; d 33 >1000pm / V), although the above methods can prepare high dielectric and piezoelectric constant ceramic materials, the preparation process is complex, unstable and costly, which is not conducive to industrial production

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