SU501462A1

SU501462A1 - Method for making ceramic piezoelectric elements

Info

Publication number: SU501462A1
Application number: SU2005324A
Authority: SU
Inventors: Вадим Сергеевич Крикоров; Анатолий Александрович Олейников; Нариман Смаилович Ибраимов
Original assignee: Предприятие П/Я В-8941
Priority date: 1974-03-13
Filing date: 1974-03-13
Publication date: 1976-01-30

Description

1one

Изобретение относитс к электронной технике и может быть использовано при призводстве пьезоэлементов.The invention relates to electronic engineering and can be used in the production of piezoelectric elements.

Известен способ изготовлени керамических пьезоэлементов, включающий обра- ботку инфракрасным иачучением, сортировк по линейному коэффициенту поглощени инфракрасного излучени , металлизацию и пол ризацию электрическим полем заготовок пьезоэлементов.A known method of manufacturing ceramic piezoelectric elements includes the processing of infrared radiation, sorting according to the linear absorption coefficient of infrared radiation, metallization and polarization of the piezoelectric elements by an electric field.

Однако пьезоэлементы, изготовленные по известному способу, имеют низкую стабильность электрофизических характеристик и большую их дисперсию.However, piezoelectric elements manufactured by a known method have low stability of electrophysical characteristics and their greater dispersion.

Цель изобретени - повышение стабиль- ности и уменьщение дисперсии электрофизических характеристик пьезоэлементов.The purpose of the invention is to increase the stability and decrease the dispersion of the electrophysical characteristics of the piezoelectric elements.

Это достигаетс тем, что по предлагаемому способу перед металлизацией заготовки пьезоэлементов, имеющие более низ- кий линейный коэффициент поглощени инфракрасного излучени по сравнению с требуемым, отжигают в окислительной среде , а заготовки, имеющие более высокий линейный коэффициент поглощени отжигают в восстановительной среде и пол ризацию производ т электрическим полем с максимально возможной дл данной керамики напр женностью, величина которой не превышает величины напр женности пол теплового пробо керамики.This is achieved by the fact that prior to metallization, the billet of piezoelectric elements, which have a lower linear absorption coefficient of infrared radiation than the required one, are annealed in an oxidizing environment, and billets that have a higher linear absorption coefficient are annealed in a reducing environment and polarization t is an electric field with the maximum possible for a given ceramics strength, the magnitude of which does not exceed the strength of the field of thermal breakdown of ceramics.

Способ может быть реализован следующим образом.The method can be implemented as follows.

Заготовки керамических пьезоэлементов облучают инфракрасным изл чением и сортируют по коэффициенту линейного поглощени .The billets of ceramic piezoelectric elements are irradiated with infrared radiation and sorted by linear absorption coefficient.

Claims

Billets that have an absorption coefficient greater than the optimum for a particular purpose are annealed in a reducing medium at 6OO-1OOO C to obtain an absorption coefficient equal to the specified one. Piezo element blanks having a low absorption coefficient are annealed in an oxidizing environment at 7OO-1OOO ° C to obtain a given absorption coefficient. Then the blanks of the piezo elements are metallized. After metallization of the blanks, the polarization is carried out by a saturation field for the given ceramic material, i.e.. :. 3, field, the intensity of which is limited only by the intensity of the thermal floor. The piezoelectric elements manufactured according to the method have the best electrophysical characteristics and a significantly lower dispersion. The temperature coefficient of the frequency of the piezoelectric elements decreases by a factor of 2-3, the stability of the polarized state increases dramatically, as determined by the spreading effect of thermal fields to mechanical stresses, the dispersion of electrophysical characteristics decreases by almost 2 times and the output helium increases. Claims The method of manufacturing ceramic piezoelectric elements, including processing by infrared radiation, sorting according to linear absorption coefficient of infrared radiation, metallization and polarization of the piezoelectric billet by the electric field, characterized in that in order to increase stability and reduce the dispersion of the electrophysical characteristics of the piezoelectric elements having a lower linear absorption coefficient of infrared radiation compared to three boiled, annealed in an oxidizing environment, and billets having a higher absorption coefficient are annealed in a reducing environment and the polarization is produced by an electric field with the maximum possible strength for a given ceramic, the magnitude of which does not exceed the intensity of the field of thermal sample of ceramics.