Ultrasonic flat type piezoelectric vibrator

Abstract

The invention relates to an ultrasonic flat type piezoelectric vibrator which is made of niobium zinc-niobium lead stannate. The chemical molecular formula is Pb(Zn1 / 3Nb2 / 3)x(Sn1 / 3Nb2 / 3) yTizZr1-x-y-zO3. A proportioning test is carried out by setting x and y in the molecular formula of the niobium zinc-niobium lead stannate material to be within the ranges of 0<x<0.1 and 0<y<0.1 and respectively setting Ti and Zr to be within the range of 0.4 to 0.44; and the numerical values of x, y and z are determined from a test result, namely, the optimal proportion of each component is determined. In the design scheme, utilization performance is largely enhanced, service life is largely prolonged, the mechanical quality, the factor and the tensile strength of piezoelectric ceramics which are finished are improved, the sensibility of the ultrasonic flat type piezoelectric vibrator is enhanced, the loss is reduced, the tensile strength is improved, and the aging performance is improved. Piezoelectric ceramic chips and a silver electrode are connected through a red copper film the surface of which is coated with a stannum layer, thus, defects such as convex welding points, higher resistance and the like of a traditional product are avoided. The vibrator can carry heavier current, is difficult to break or burn out, and has excellent consistency and reliability; and the rate of finished products is increased to 99% from original 92%.

Description

technical field [0001] The invention relates to a piezoelectric ceramic product, in particular to an ultrasonic flat-plate piezoelectric vibrator. Background technique [0002] Since the discovery of PZT lead zirconate titanate piezoelectric ceramics in 1954, the United States, Japan, the Netherlands and many other countries have conducted detailed research on the system, and derived a series of PZT piezoelectric ceramic materials with superior performance. In-depth, its application range has also been greatly expanded. Based on lead zirconate titanate, ternary and quaternary piezoelectric ceramics improved with various elements also came into being. In 1965, Matsushita Electric Company of Japan introduced Pb(Mg1 / 3Nb2 / 3)03 was added to PZT as the third component to make the first ternary ceramics. It was found that adding some oxides to this ternary piezoelectric ceramics would improve the mechanical and electrical properties. Coupling coefficient KP and high mechanical qua...

AI Technical Summary

Problems solved by technology

[0006] In addition, in the electrode connection of the ultrasonic flat piezoelectric vibrator, silver paste (silver burning) is usually used, but in practical applications, this method exists in the flat piezoelectric vibrator, which seriously affects the performance of the ultrasonic piezoelectric ceramic device. and service life