Method for manufacturing fine straight PZT piezoelectric fiber array

Abstract

A method for manufacturing a fine straight PZT (Pbbased Lanthanumdoped Zirconate Titanates) piezoelectric fiber array relates to a method for manufacturing functional ceramic fiber. The method comprises the steps as follows: preparing PZT sol at first by taking plastic capillary tubes as reaction templates; then adding PZT millimicron powder to get suspending liquid after uniform blending; placing the plastic capillary tubes into a quartz tube with two ends opened; filling the gaps among the capillary tubes, as well between the quartz tube and the plastic capillary tubes with glue or paraffin, so as to form an array shape after solidification; submerging the quartz tube into the suspending liquid, and after full adsorption, pouring the remain suspending liquid into the quartz tube from one end and performing vacuum filtration at the other end, for ensuring that the suspending liquid enters into the plastic capillary tubes through vacuumize force until the capillary tubes are full of suspending liquid; and after the quartz tubes are dried to have no excess liquid, repeatedly performing dipping, vacuum filtration and drying to the withdrawn quartz tubes, then performing template removal and crystallization thermal treatment, and obtaining the PZT piezoelectric fiber array with a diameter ranging from several microns to hundreds of microns, a length ranging from 0.5cm to 3cm, as well as straight form and high density.

Description

technical field [0001] The invention relates to a functional ceramic fiber and a manufacturing method thereof, in particular to a manufacturing method of a fine straight PZT piezoelectric fiber array. Background technique [0002] Piezoelectric fibers and their array structures have great potential in the fields of sensors, drivers, ultrasonic sensor devices, automobiles, and aviation due to their high piezoelectric strain constant, thickness electromechanical coupling coefficient, low mechanical quality factor, and acoustic impedance. potential applications. [0003] At present, the commonly used methods for preparing piezoelectric fibers include sol-gel method, extrusion method, spinning method, drawing method, mechanical cutting method, matrix fiber impregnation method, etc. For example, Advanced Cerametrics in the United States prepared PZT fibers with a cross-sectional size of 80-300 μm by suspending magnetic powder spinning. However, because this method uses a large a...

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Problems solved by technology

For example, Advanced Cerametrics in the United States prepared PZT fibers with a cross-sectional size of 80-300 μm by suspending magnetic powder spinning. However, because this method uses a large amount of organic polymers as carriers, there are many voids inside the fibers after pyrolysis and sintering. , the uniformity of the fiber decreases. In addition, the viscosity of the suspension is high, and it is difficult to control fibers with small diameters; Williams et al. prepared piezoelectric fibers by cutting method, because the method is to prepare piezoelectric ceramics first, and then cut them into Fiber, the size of the fiber is related to the advanced degree of mechanical processing, but it is difficult to process the cross-sectional size of the fiber below 100 μm; Brei et al. proposed to use the template impregnation method to prepare carbon fiber. The fiber prepared by this method has certain strength and the fiber diameter is relatively small. Fine, but the fiber is extremely uneven and has a large amount of deformation; Jiangsu University prepared PZT fibers with a diameter of 200-400 μm by sol-powder blending extrusion method. The fiber density prepared by this method is high, but the thickness of the fiber is affected by Due to the limitation of the mold, it is extremely difficult to prepare straight fibers with a diameter of less than 100 μm

[0004]At present, the piezoelectric fiber arrays are basically obtained by the arrangement method on the basis of the piezoelectric fibers. This method is effective for the arrays composed of thick fibers. However, for microfibers, especially fibers with a diameter of less than a few hundred microns, it is extremely unfavorable to use the array method to obtain the array because it is easy to cause fiber damage and array confusion during the operation.

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