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Lead-free piezoelectric ceramic material and preparation method thereof
The invention discloses a lead-free piezoelectric ceramic material and a preparation method thereof, and belongs to a piezoelectric ceramic material and a preparation method thereof. The structural general formula of the lead-free piezoelectric ceramic material provided by the invention is Lix (Na < 0.5 > K < 0.5 >) < 1-x > NbO < 3 + > w mol% A, wherein x is equal to 0.05 to 0.45, and w is equal to 0.05 to 1.5; and the additive A is one or more of Ta2O5, WO3 and Yb2O3. The preparation method provided by the invention comprises the following steps: weighing raw materials Nb2CO3, K2CO3, Li2CO3, Nb2O5 and an additive A according to the molar ratio of the structural general formula, mixing the raw materials, and carrying out vibration grinding to obtain a primary grinding material; pre-sintering the primary grinding material for 2-3.5 hours to obtain a pre-sintered material; crushing the pre-sintered material, and performing vibration milling to obtain porcelain powder; adding an adhesive into the porcelain powder, mixing, rolling, punching and forming to obtain a porcelain blank; printing silver paste on the surface and the back surface of the sintered ceramic blank, drying and sintering silver to obtain a silver-coated ceramic chip; and the silver ceramic chip polarizes. The lead-free piezoelectric ceramic material has high piezoelectric constant and dielectric constant and large electromechanical coupling coefficient, and can be used in an environment at the temperature of 220 DEG C or above.
本发明公开了一种无铅压电陶瓷材料及其制备方法，属于压电陶瓷材料及其制备方法。本发明提供的无铅压电陶瓷材料结构通式为Lix(Na0.5K0.5)1‑xNbO3+w mol％A；其中，x＝0.05～0.45，w＝0.05～1.5；添加物A为Ta2O5、WO3、Yb2O3中的一种或几种。本发明提供的制备方法是按所述结构通式的摩尔比称取原料Nb2CO3、K2CO3、Li2CO3、Nb2O5添加物A，各原料混合振磨，得一次磨料；一次磨料在预烧2～3.5小时，得预烧料；预烧料破碎后振磨，得瓷粉；瓷粉中加入粘合剂，混合、轧膜、冲片成型，得瓷坯；在烧结后的瓷坯表面和背面印刷银浆，烘干、烧银得被银瓷片；被银瓷片极化。本发明无铅压电陶瓷材料具有高的压电常数和介电常数，较大的机电耦合系数，可在220℃以上环境中使用。
Lead-free piezoelectric ceramic material and preparation method thereof
The invention discloses a lead-free piezoelectric ceramic material and a preparation method thereof, and belongs to a piezoelectric ceramic material and a preparation method thereof. The structural general formula of the lead-free piezoelectric ceramic material provided by the invention is Lix (Na < 0.5 > K < 0.5 >) < 1-x > NbO < 3 + > w mol% A, wherein x is equal to 0.05 to 0.45, and w is equal to 0.05 to 1.5; and the additive A is one or more of Ta2O5, WO3 and Yb2O3. The preparation method provided by the invention comprises the following steps: weighing raw materials Nb2CO3, K2CO3, Li2CO3, Nb2O5 and an additive A according to the molar ratio of the structural general formula, mixing the raw materials, and carrying out vibration grinding to obtain a primary grinding material; pre-sintering the primary grinding material for 2-3.5 hours to obtain a pre-sintered material; crushing the pre-sintered material, and performing vibration milling to obtain porcelain powder; adding an adhesive into the porcelain powder, mixing, rolling, punching and forming to obtain a porcelain blank; printing silver paste on the surface and the back surface of the sintered ceramic blank, drying and sintering silver to obtain a silver-coated ceramic chip; and the silver ceramic chip polarizes. The lead-free piezoelectric ceramic material has high piezoelectric constant and dielectric constant and large electromechanical coupling coefficient, and can be used in an environment at the temperature of 220 DEG C or above.
本发明公开了一种无铅压电陶瓷材料及其制备方法，属于压电陶瓷材料及其制备方法。本发明提供的无铅压电陶瓷材料结构通式为Lix(Na0.5K0.5)1‑xNbO3+w mol％A；其中，x＝0.05～0.45，w＝0.05～1.5；添加物A为Ta2O5、WO3、Yb2O3中的一种或几种。本发明提供的制备方法是按所述结构通式的摩尔比称取原料Nb2CO3、K2CO3、Li2CO3、Nb2O5添加物A，各原料混合振磨，得一次磨料；一次磨料在预烧2～3.5小时，得预烧料；预烧料破碎后振磨，得瓷粉；瓷粉中加入粘合剂，混合、轧膜、冲片成型，得瓷坯；在烧结后的瓷坯表面和背面印刷银浆，烘干、烧银得被银瓷片；被银瓷片极化。本发明无铅压电陶瓷材料具有高的压电常数和介电常数，较大的机电耦合系数，可在220℃以上环境中使用。
Lead-free piezoelectric ceramic material and preparation method thereof
无铅压电陶瓷材料及其制备方法
ZHANG TIANCAI (Autor:in) / DAI ZHAOBO (Autor:in) / LI YA (Autor:in) / LI BANGJU (Autor:in) / MENG GUANGLIAN (Autor:in) / WANG LANHUA (Autor:in)
22.12.2023
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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