Abstract
Piezoelectric ceramics have recently become one of the most common materials in electromechanical industries, especially in the microelectronic packaging industry. In a jetting dispenser, the presence of imbalanced stress-induced defects in such materials prevents them from providing high stability during the jetting dispensing process. In this work, lead zirconate titanate piezoelectric ceramics (PZT ceramics) were used to actuate the amplifying mechanism of the jetting dispenser. However, during the cyclic dispensing, several ceramics were found to be damaged. In order to figure out what actually caused the damage, analytical and experimental studies were carried out to acquire characteristics of PZT ceramics with damages, and simulation studies of overstress were also performed. Details of the damage characteristics in PZT ceramics are discussed in this paper. This work will improve the stability and life of the piezoelectric dispenser and further promote its wide application in various fields.
Highlights
Piezoelectric ceramics have recently been widely used in precision machining, precision measurement, aerospace, and optical apparatus, thanks to its small size, large force output, highprecision, high-frequency, high displacement resolution, and quick response.1–3 With the application of piezoelectric ceramics, the piezoelectric micro jetting valve is widely used in the dispensing process of various industries, which have strict requirements of highfrequency, stability, and precise droplet dispensing
In a jetting dispenser driven by piezoelectric ceramics, in order to obtain a larger displacement output and higher frequency for the dispensing stem while ensuring safety and stability, a displacement amplifying mechanism needs to be designed for the piezoelectric ceramic installation
It is known that the piezoelectric constant d33 of piezoelectric ceramics usually decreases with increasing temperature,13,14 which is another piece of indirect evidence to this analysis
Summary
Piezoelectric ceramics have recently been widely used in precision machining, precision measurement, aerospace, and optical apparatus, thanks to its small size, large force output, highprecision, high-frequency, high displacement resolution, and quick response. With the application of piezoelectric ceramics, the piezoelectric micro jetting valve is widely used in the dispensing process of various industries, which have strict requirements of highfrequency, stability, and precise droplet dispensing. With the application of piezoelectric ceramics, the piezoelectric micro jetting valve is widely used in the dispensing process of various industries, which have strict requirements of highfrequency, stability, and precise droplet dispensing. In a jetting dispenser driven by piezoelectric ceramics, in order to obtain a larger displacement output and higher frequency for the dispensing stem while ensuring safety and stability, a displacement amplifying mechanism needs to be designed for the piezoelectric ceramic installation. A great number of research studies have been carried out on piezoelectric ceramics, analysis of failures in piezoelectric ceramics that are used for driving the jetting dispenser was rarely mentioned in the literature. It can be deduced that the ceramics are not in an optimal working status, and the design of a new amplifying mechanism should be taken into consideration in future study
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