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    High temperature, high strain piezoelectric compositions
    3.
    发明授权
    High temperature, high strain piezoelectric compositions 有权
    高温高应变压电组合物

    公开(公告)号：US06279878B1

    公开(公告)日：2001-08-28

    申请号：US09561094

    申请日：2000-04-28

    申请人： Jeffrey G. Nelson ,  Ratnakar R. Neurgaonkar

    发明人： Jeffrey G. Nelson ,  Ratnakar R. Neurgaonkar

    IPC分类号： C04B35493

    CPC分类号： H01L41/187 ,  C04B35/491 ,  C04B35/493

    摘要： PLZT piezoelectric ceramics having the general formula (Pb1−xLax)(ZryTi1−y)1−(x/4)−zMa+4z/a O3 are fabricated in a hot forging process using PbO, TiO2, ZrO2, and La2O3 powders with Nb2O5 and Ta2O5 added to provide 2.0-3.0% Nb5+ (mole %) and 2.0-3.0% Ta+5 (mole %) as a dopant. ZrO2 and TiO2 powders are mixed at a molar ratio of y/(1−y), the preferred molar ratio being 55/45, calcined at approximately 1300° C.-1500° C., ball milled in acetone, and evaporated to a dry powder. The mixture of ZrO2 and TiO2 is then combined with PbO2, La2O3, Nb2O5 and Ta2O5 powders, and the new mixture is ball milled in acetone, evaporated to a dry powder, calcined at approximately 700°-850° C., and sifted to obtain a particle size of approximately 0.5-1.5 &mgr;m. The final Nb/Ta-doped PLZT powder is formed into the desired shape by cold pressing followed by sintering at approximately 1000° C.-1150° C. in oxygen. The PLZT ceramic material is further densified to about 98.5% of the material's theoretical maximum density by heating to approximately 1175° C.-1275° C. at 300-1200 psi uniaxial pressure. The resulting high temperature, high performance Nb/Ta-doped PLZT piezoelectric ceramic exhibits an average grain size of about 3 &mgr;m, a well-defined polarization hysteresis loop, reduced strain hysteresis with the application of a unipolar electric field, a breakdown strength greater than 25 kV/cm, a linear piezoelectric coefficient (d33) of about 790 pC/N, maximum strain greater than 0.16%, and a fatigue life of at least 108 cycles and a Tc of about 205-208° C.

    摘要翻译： 具有通式（Pb1-xLax）（ZryTi1-y）1-（x / 4）-zMa + 4z / aO3的PLZT压电陶瓷是在使用PbO，TiO2，ZrO2和La2O3粉末与Nb2O5的热锻造工艺中制造的 并添加Ta2O5，以提供2.0-3.0％的Nb5 +（摩尔％）和2.0-3.0％的Ta + 5（摩尔％）作为掺杂剂。 ZrO 2和TiO 2粉末以y /（1-y）的摩尔比混合，优选的摩尔比为55/45，在约1300℃-1500℃下煅烧，在丙酮中球磨并蒸发至 干燥的粉。 然后将ZrO 2和TiO 2的混合物与PbO 2，La 2 O 3，Nb 2 O 5和Ta 2 O 5粉末组合，将新混合物在丙酮中球磨，蒸发至干粉末，在约700℃-850℃下煅烧，并筛分得到 粒径约为0.5-1.5μm。 通过冷压将最终的Nb / Ta掺杂的PLZT粉末形成所需的形状，然后在约1000℃-1150℃的氧气中烧结。 通过在300-1200psi单轴压力下加热至约1175℃-1275℃，将PLZT陶瓷材料进一步致密化为材料理论最大密度的约98.5％。 所得到的高温，高性能Nb / Ta掺杂的PLZT压电陶瓷的平均晶粒尺寸约为3μm，明确的极化磁滞回线，应用单极电场的应变滞后减小，击穿强度大于 25kV / cm，约790pC / N的线性压电系数（d33），最大应变大于0.16％，疲劳寿命至少为108次循环，Tc为约205-208℃。

    Composition for piezoelectric ceramics
    4.
    发明授权
    Composition for piezoelectric ceramics 失效
    压电陶瓷组合物

    公开(公告)号：US06207070B1

    公开(公告)日：2001-03-27

    申请号：US09373195

    申请日：1999-08-12

    申请人： Satoshi Sasaki ,  Masaru Abe

    发明人： Satoshi Sasaki ,  Masaru Abe

    IPC分类号： C04B35493

    CPC分类号： H01L41/187

    摘要： Composition for piezoelectric ceramics includes a main component and a sub component. The main component is expressed with a general expression of aPb(Mg⅓Nb⅔)O3-bPb(Yb⅓Nb⅔)O3-cPbTiO3-dPbZrO3, where a+b+c+d=1, 0.01≦a≦0.07, 0.01≦b≦0.07, 0.35≦c≦0.55, and 0.4≦d≦0.6. The sub component contains 0.1 to 0.7 wt % of Mn in terms of manganese oxide, 0.01 to 0.3 wt % of Cr in terms of chromium oxide and 0.05 to 0.5 wt % of Co in terms of cobalt oxide per the weight of 1 mol of main component.

    摘要翻译： 用于压电陶瓷的组合物包括主要组分和副组分。 主要成分用aPb（Mg 1/3 N b O）O 3 -bPb（Yb 1/3 N b）O 3 -cPbTiO 3-dPb ZrO 3的一般表达式表示，其中a + b + c + d = 1，0.01 <= a <= 0.07,0.01 <= b < = 0.07，0.35 <= c <= 0.55，而0.4 <= d <= 0.6。 副成分以氧化锰计含有0.1〜0.7重量％的Mn，以氧化铬计为0.01〜0.3重量％的Cr，以重量1摩尔为主的氧化钴为0.05〜0.5重量％的Co 零件。