A kind of high electrostrain lead-free piezoelectric ceramic material and its preparation method and application
A ceramic material, lead-free piezoelectric technology, applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems of poor process stability, complicated preparation methods, and high cost, and achieve The effect of low cost, good process stability and excellent piezoelectric performance
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Embodiment 1
[0047] Preparation of Bi 4 Ti 3 o 12 Flaky powder material.
[0048] Weigh 11.356g Bi 2 o 3 Powder, 2.607g TiO 2 Powder, then weigh 16.756g of NaCl powder, 36.863g of zirconium balls, mix all the powder with absolute ethanol and ball mill for 24 hours, dry the mixed material, put it into an alumina crucible and put it in a furnace to heat up first Keep warm at 805°C for 1 hour, then slowly raise the temperature to 1050°C for 2 hours, put it into a Buchner funnel after cooling, wash NaCl with deionized water, and dry to obtain Bi 4 Ti 3 o 12 Flaky powder material.
[0049] figure 1 is the prepared Bi 4 Ti 3 o 12 X-ray diffraction patterns of powder materials. It can be seen from the figure that it is a bismuth layered structure, and no other impurity phases are observed.
[0050] figure 2 is the prepared Bi 4 Ti 3 o 12 SEM images of powder materials. It can be clearly seen from the figure that Bi 4 Ti 3 o 12 The powder material has a flake structure with ...
Embodiment 2
[0052] 0.94 (Bi 0.5 Na 0.5 )TiO 3 -0.06BaTiO 3 Preparation of base material: using NaCO 3 、 Bi 2 o 3 and TiO 2 As the raw material, first according to (Bi 0.5 Na 0.5 Ti)O 3 The stoichiometric ratio of Na, Bi and Ti elements in NaCO was weighed 3 、 Bi 2 o 3 and TiO 2 , prepared in turn through batching, mixing, pre-pressing and heat treatment steps (Bi 0.5 Na 0.5 Ti)O 3 base material; again according to BaTiO 3 The stoichiometric ratio of Ba and Ti elements weighs BaCO 3 and TiO 2 , and the BaTiO 3 base material; finally to be obtained (Bi 0.5 Na 0.5 Ti)O 3 and BaTiO 3 Base material according to 0.94 (Bi 0.5 Na 0.5 )TiO 3 -0.06BaTiO 3 After the proportion of the material is weighed, the ball mill is mixed for 24 hours, dried and then passed through an 80-mesh sieve to obtain 0.94 (Bi 0.5 Na 0.5 )TiO 3 -0.06BaTiO 3 Binder.
[0053] Among them, (Bi 0.5 Na 0.5 )TiO 3 The heat treatment temperature is 850℃ and the holding time is 5h; BaTiO 3 The h...
Embodiment 3
[0059] Take by weighing 9.0g implementation 2 prepared 0.94 (Bi 0.5 Na 0.5 )TiO 3 -0.06BaTiO 3 Base material and 1.0g of Bi prepared in Implementation 1 4 Ti 3 o 12 Flake powder material, 12g of zirconium balls, put into a ball mill jar, mix with absolute ethanol ball mill and ball mill for 24 hours, dry the mixed material and pass through an 80-mesh sieve. Then granulate, and finally press the tablet under the pressure of 4Mpa. The formed green body is debonded at 550°C, and finally heat-treated at 1160°C in a silicon carbide rod furnace to prepare 0.9[0.94BNT-0.06BT with good compactness. ]-0.1BiT lead-free piezoelectric ceramic material.
[0060] Image 6 It is the SEM picture of 0.9[0.94BNT-0.06BT]-0.1BiT lead-free piezoelectric ceramics. It can be seen from the picture that the ceramics have high density without any holes, and the grain size is smaller than that of Example 2.
[0061] Figure 7 It is the electro-induced strain curve of 0.9[0.94BNT-0.06BT]-0.1BiT ...
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