Non-pressure infiltration preparation process of functionally graded piezoelectric material (FGPM)

Abstract

The invention provides a non-pressure infiltration preparation process of a functionally graded piezoelectric material (FGPM). The process comprises the following steps: (1) raw material preparation; (2) prefabricated body forming, wherein a blank with the voidage continuously changing in the thickness direction within 35%-40% is obtained, and a layer of Fe powder of the particle size of 7 micrometers is laid on the prefabricated body; (3) sintering, wherein liquid Fe in each layer of mixed powder of a high Fe content is made to infiltrate into air voids in a lower layer of the prefabricated body, so that an interface gradient is formed; (4) FGPM densification; (5) polishing, wherein a prepared FGPM block is ground and polished, and finally the Fe / PZT-5 FGPM with material components continuously changing is obtained through preparation. The prefabricated body with the voidage continuously changing can be prepared by controlling the content of a binding agent and enhancing the change of the body particle diameter, and the ideal FGPM block with the components continuously changing can be obtained under the condition of sufficient layers.

Description

technical field [0001] The invention relates to a method for preparing a metal-based ceramic functionally graded piezoelectric material, in particular to a pressureless infiltration preparation process for a functionally graded piezoelectric material (Functionally Graded Piezoelectric Materials; FGPM for short). Background technique [0002] Piezoelectric materials can be used not only as transducer elements, but also as drive elements, and can form composite materials with metal materials, so they have broad application prospects, especially in smart structures and micro-electromechanical systems. In order to obtain a larger displacement and driving force, the piezoelectric element needs to be designed as a multi-layer structure. In this structure, although a larger driving force is obtained, the sudden change in the composition and performance of different materials inside the element often leads to The local stress mismatch in the structure, that is, there is obvious ...

AI Technical Summary

Problems solved by technology

Die casting has a short manufacturing cycle and is suitable for mass production; however, special equipment and metal molds are required to increase production costs, and the pressure exerted by die casting is high, so it can only manufacture parts with simple shapes. When preparing small and thin-walled parts Easily fractured and cracked

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