Bismuth calcium niobate high-temperature piezoelectric ceramic material with bismuth layer structure and preparation method thereof

Bismuth calcium niobate high-temperature piezoelectric ceramic material with bismuth layer structure and preparation method thereof

  • CN 106,554,203 B
  • Filed: 11/14/2016
  • Issued: 08/18/2020
  • Est. Priority Date: 11/14/2016
  • Status: Active Grant
First Claim
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1. The bismuth calcium niobate high-temperature piezoelectric ceramic material with the bismuth layer structure is characterized by comprising the following chemical components:

  • ca0.9(LiGd)0.05Bi2Nb1.95Cr0.05O9(ii) a The piezoelectric constant d of the bismuth calcium niobate high-temperature piezoelectric ceramic material with the bismuth layer structure33Is 18 pC/N;

    the preparation method comprises the following steps;

    with CaCO3Powder and Li2CO3Powder and Gd2O3Powder of Bi2O3Powder and Nb2O5Powder and Cr2O3The powder is taken as a raw material, and is prepared according to the stoichiometric ratio of Ca, Li, Gd, Bi, Cr and Nb in the general formula, and is pre-ball milled to obtain mixed powder;

    drying the mixed powder, and then performing presintering to obtain presintering powder;

    the pre-sintering temperature is 800-;

    performing secondary ball milling on the pre-sintered powder to obtain powder subjected to secondary ball milling;

    adding a bonding agent into the powder subjected to the secondary ball milling to press the powder into ceramic blank sheets, and performing plastic removal treatment;

    the adhesive is 5 weight percent polyvinyl alcohol aqueous solution;

    the dosage of the adhesive is 6-8% of the total weight of the powder after the secondary ball milling;

    sintering and cooling the ceramic blank sheet subjected to the plastic removal treatment;

    the plastic discharge temperature is 600-800 ℃

    ;

    the sintering temperature is 1100-1200 ℃

    , and the sintering heat preservation time is 2-4 h;

    polishing the cooled ceramic blank sheet, and carrying out silver electrode and polarization treatment to obtain the bismuth calcium niobate high-temperature piezoelectric ceramic material with the bismuth layer-shaped structure;

    the temperature of the polarization treatment is 150-;

    the ball milling medium of the pre-ball milling and the secondary ball milling is deionized water, and the using amount of the deionized water is 60-80% of the total weight of the raw materials;

    the ball milling speed of the pre-ball milling and the secondary ball milling is 200-300r/min, and the ball milling time is 8-12 h.

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