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Potassium-sodium niobate-based lead-free piezoelectric ceramic material with ultralow dielectric loss and preparation method thereof
The invention belongs to the technical field of lead-free ferroelectric piezoelectric ceramic materials, and particularly relates to a potassium-sodium niobate-based lead-free piezoelectric ceramic material with ultralow dielectric loss and a preparation method thereof. The potassium-sodium niobate-based lead-free piezoelectric ceramic material with ultralow dielectric loss, disclosed by the invention, has a chemical expression shown as [(Na<0.1>K<0.>)<0.23>Li<0.77>][(Nb<0.15>Sb<0.85>)<0.41>Ta<0.59>]O<3>+ x mol% TM, wherein TM is one of MnO2, Fe2O3, Ni2O3 or CuO, and the value of x is 0.1 to 0.75. The invention also discloses the preparation method of the potassium-sodium niobate-based lead-free piezoelectric ceramic material with ultralow dielectric loss. According to the invention, a special method of synergistic modification of three modes of compound substitution of Na<+> and K+ on A site by Li<+>, compound substitution of Nb<5+> on B site by Ta<5+> and Sb<5+>, and metal oxide doping is adopted, so that the defect of poor sinterability of pure KNN ceramic is overcome, and the niobate lead-free piezoelectric ceramic material with excellent electrical properties is prepared by a traditional sintering process; the dielectric loss of the ceramic material is greatly superior to that of KNN-based ceramic reported at present. The preparation method disclosed by the invention has the effects of simple process and good repeatability and stability, so that the preparation method has practical application value.
本发明属于无铅铁电压电陶瓷材料技术领域，具体涉及超低介电损耗的铌酸钾钠基无铅压电陶瓷材料及其制备方法。本发明公开了超低介电损耗的铌酸钾钠基无铅压电陶瓷材料，其化学表达式为：[(Na0.1K0.9)0.23Li0.77][(Nb0.15Sb0.85)0.41Ta0.59]O3+xmol％TM；其中TM为MnO2、Fe2O3、Ni2O3或CuO中的一种；x值为0.1～0.75。还公开了超低介电损耗的铌酸钾钠基无铅压电陶瓷材料的制备方法。本发明通过Li+对A位Na+、K+和Ta5+、Sb5+对B位Nb5+复合取代、金属氧化物掺杂三种方式协同改性的特殊方法，解决了纯KNN陶瓷可烧结性差的缺点，实现用传统烧结工艺制备出不仅具有优良电学性能的铌酸盐无铅压电陶瓷材料，而且其介电损耗大幅优于目前报道的KNN基陶瓷；本发明的制备方法，其具有工艺简单、重复性、稳定性好的效果，因此具有实际应用的价值。
Potassium-sodium niobate-based lead-free piezoelectric ceramic material with ultralow dielectric loss and preparation method thereof
The invention belongs to the technical field of lead-free ferroelectric piezoelectric ceramic materials, and particularly relates to a potassium-sodium niobate-based lead-free piezoelectric ceramic material with ultralow dielectric loss and a preparation method thereof. The potassium-sodium niobate-based lead-free piezoelectric ceramic material with ultralow dielectric loss, disclosed by the invention, has a chemical expression shown as [(Na<0.1>K<0.>)<0.23>Li<0.77>][(Nb<0.15>Sb<0.85>)<0.41>Ta<0.59>]O<3>+ x mol% TM, wherein TM is one of MnO2, Fe2O3, Ni2O3 or CuO, and the value of x is 0.1 to 0.75. The invention also discloses the preparation method of the potassium-sodium niobate-based lead-free piezoelectric ceramic material with ultralow dielectric loss. According to the invention, a special method of synergistic modification of three modes of compound substitution of Na<+> and K+ on A site by Li<+>, compound substitution of Nb<5+> on B site by Ta<5+> and Sb<5+>, and metal oxide doping is adopted, so that the defect of poor sinterability of pure KNN ceramic is overcome, and the niobate lead-free piezoelectric ceramic material with excellent electrical properties is prepared by a traditional sintering process; the dielectric loss of the ceramic material is greatly superior to that of KNN-based ceramic reported at present. The preparation method disclosed by the invention has the effects of simple process and good repeatability and stability, so that the preparation method has practical application value.
本发明属于无铅铁电压电陶瓷材料技术领域，具体涉及超低介电损耗的铌酸钾钠基无铅压电陶瓷材料及其制备方法。本发明公开了超低介电损耗的铌酸钾钠基无铅压电陶瓷材料，其化学表达式为：[(Na0.1K0.9)0.23Li0.77][(Nb0.15Sb0.85)0.41Ta0.59]O3+xmol％TM；其中TM为MnO2、Fe2O3、Ni2O3或CuO中的一种；x值为0.1～0.75。还公开了超低介电损耗的铌酸钾钠基无铅压电陶瓷材料的制备方法。本发明通过Li+对A位Na+、K+和Ta5+、Sb5+对B位Nb5+复合取代、金属氧化物掺杂三种方式协同改性的特殊方法，解决了纯KNN陶瓷可烧结性差的缺点，实现用传统烧结工艺制备出不仅具有优良电学性能的铌酸盐无铅压电陶瓷材料，而且其介电损耗大幅优于目前报道的KNN基陶瓷；本发明的制备方法，其具有工艺简单、重复性、稳定性好的效果，因此具有实际应用的价值。
Potassium-sodium niobate-based lead-free piezoelectric ceramic material with ultralow dielectric loss and preparation method thereof
超低介电损耗的铌酸钾钠基无铅压电陶瓷材料及其制备方法
GUO JINMING (Autor:in) / YANG BIN (Autor:in) / ZOU LONGJUN (Autor:in) / HE YUNBIN (Autor:in) / ZHOU TAOSHENG (Autor:in) / SHANG XUNZHONG (Autor:in)
29.10.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
Preparation method of potassium-sodium-niobate-based lead-free piezoelectric ceramic
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