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• THE PROSPECTS FOR INTENSIFICATION OF SINTERING OF PIEZOCERAMIC MATERIALS

  M.A. Marakhovskiy , V.A. Marakhovskiy , А. А. Panich

  2020-10-11

  Abstract ▼

  The paper investigates the possibility of changing the properties of piezoelectric ceramics for various purposes.
  The aim of the study is to correct properties by changing technological factors in the manufacture of
  piezoceramics without modifying their chemical composition. At the most important technological stage – sintering
  – the density, hardness and strength of piezoceramics are formed, which directly affect its electrophysical
  parameters, since the piezoelectric effect is an Electromechanical transformation. Of particular interest are sintering
  methods that combine the process of compaction of particles with heating - hot pressing and spark plasma
  sintering. Such methods, due to the created uniaxial pressure, activate the diffusion processes of mass transfer
  during sintering, contributing to the production of high-density piezoceramics while lowering the sintering temperatures. However, unlike hot pressing, spark plasma sintering generates spark discharges between the powder
  particles, which, in combination with ultra-fast heating (up to 1000 ° C/min), forms a fine-grained monophase
  structure of ceramics. This microstructure increases the mechanical and electrophysical parameters of the resulting
  ceramics. The aim of the study was to test the proposed sintering methods on piezoelectric materials of different
  compositions in order to control their properties. The objects of research were piezoceramic materials based
  on the zirconate-titanate-lead system and their modifications, including multicomponent materials with high application
  potential, as well as lead-free ferroelectric material Ba0.55Sr0.45TiO3 (BST). The dependences of the
  formed ceramic structure on the sintering method and temperature were determined using scanning electron
  microscopy. The regularities of "sintering method – microstructure – properties" are established. The effectiveness
  of hot pressing and spark plasma sintering methods for correcting the properties of piezoceramics of various
  types of applications has been confirmed, which together with a decrease in sintering temperatures, as well as a
  reduction in the duration of the process (by 36 times!) relevant for energy saving purposes.