Characterization on the fatigue performance of a piezoelectric microvalve with a microfabricated silicon valve seat

被引：5
|
作者：
Lv, Jianlu [1 ]
Jiang, Yonggang [1 ]
Zhang, Deyuan [1 ]
Zhao, Yiju [1 ]
Sun, Xiujuan [1 ]
机构：
[1] Beihang Univ, Sch Mech Engn & Automat, Beijing 100191, Peoples R China
来源：
JOURNAL OF MICROMECHANICS AND MICROENGINEERING | 2014年 / 24卷 / 01期
基金：
中国国家自然科学基金;
关键词：
microvalve; piezoelectric; impact stress; fatigue; lifetime; FABRICATION;
D O I：
10.1088/0960-1317/24/1/015013
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We have developed a piezoelectric microvalve with a silicon seat for the propulsion system of a micro-satellite. The silicon seat is fabricated with narrow sealing rings to reduce internal leaks. The fatigue performance of the silicon seat is characterized. The lifetime of the silicon seat without coating is approximately 25 000 times, which cannot meet the requirement for astronautic applications. To improve its fatigue performance, the silicon seat is deposited with Cu and parylene, respectively. The two seats both meet the sealing requirement after 10(5) cycle operation. Several rings of the seats deposited with Cu fractured after the fatigue tests, whereas none of the rings of the seats deposited with parylene fractured due to the obvious reduction of the impact stress.
引用
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页数：6
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