Method of producing electrostrictive effect element

Details Method of producing electrostrictive effect element Method of producing electrostrictive effect element

1986-12-10

1987-07-21

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

2041802, 2041806, 2041811, 2041815, C25G 700

Patent

active

046816674

ABSTRACT:
A method of producing a laminated type electrostrictive effect element composed of a plurality of layers of electrostrictive material and a plurality of thin internal electrodes placed between adjacent layers of the electrostrictive material. The internal electrodes are exposed in side surfaces of the electrostrictive element parallel to the direction of lamination. Alternate internal electrodes are electrically connected in common to form a first group and a second group of internal electrodes, for connection to a power supply to produce a longitudinal electrostrictive strain in the direction of lamination. The method of the invention provides an efficient technique for electrically connecting alternate internal electrodes in common. The method involves forming an insulating layer of inorganic material such as glass or glass-ceramics over the portions of the exposed internal electrodes which are not to be electrically connected. The inorganic insulating material is formed by an electrophoretic process and sintered to produce an integral body consisiting of the internal electrodes, the electrostrictive material and the inorganic insulating material. In one embodiment of the invention the laminated type electrostrictive effect element is immersed in a suspension solution containing electrically charged glass powder. A voltage is applied to the internal electrodes on which the insulating layer is to be formed and an opposing electrode plate in the suspension solution is connected to the opposite polarity supply voltage. The positively charged glass powder is thereby deposited on the exposed portions of the internal electrodes connected to the voltage supply of selected polarity. Alternatively, the laminated type electrostrictive effect element is immersed in a suspension solution containing previously charged glass powder to deposit the glass powder onto the entire surface of the laminated structure. Thereafter, an electric field is applied between the internal electrodes on which the insulating layer is not to be formed and an opposing electrode plate disposed within the suspension to remove the glass powder from the selected internal electrodes.

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