摘要:
Provided is a lead-free piezoelectric ceramics having enhanced mechanical quality factor (Qm) and mechanical strength. The piezoelectric ceramics, includes at least a first crystal grain and a second crystal grain. The first crystal grain has an average equivalent circle diameter of 2 μm or more and 30 μm or less. The first crystal grain includes a perovskite-type metal oxide represented by the following general formula (1) as a main component, and the second crystal grain includes a perovskite-type metal oxide represented by the following general formula (2) as a main component: (1) xBaTiO 3 -yCaTiO 3 -zCaZrO 3 ; and (2) x'BaTiO 3 -y'CaTiO 3 -z'CaZrO 3 , provided that x, y, z, x', y', and z' satisfy x+y+z=1, x'+y'+z'=1, 0≤x'≤0.15, 0.85≤y'≤1, 0≤z'≤0.05, x>x', 0 0.
摘要:
Textured PMN-PZT fabricated by templated grain growth (TGG) method has a piezoelectric coefficient ( d ) of 3 to 5 times that of its random counterpart. By combining this TGG method with low-temperature co-firing ceramics (LTCC) techniques, co-fired multilayer textured piezoelectric ceramic materials with inner electrodes were produced at a temperature as low as 925 °C, which silver could be used. Trilayer PMN-PZT ceramics prepared by this method show a strain increase of 2.5 times, a driving voltage decrease of 3 times, and an equivalent piezoelectric coefficient ( d* ) improvement of 10 to 15 times that of conventional random ceramic counterparts. Further, a co-fired magnetostrictive / piezoelectric / magnetostrictive laminate structure with silver inner electrode was also synthesized. The integration of textured piezoelectric microstructure with the cost-effective low-temperature co-fired layered structure achieves strong magnetoelectric coupling. These new materials have promising applications including as actuators, ultrasonic transducers, and use in energy harvesters.
摘要:
Grain fondu présentant la composition chimique suivante : - plus de 10% et moins de 50% d'alumine Al 2 O 3 ; - plus de 10% et moins de 50% d'oxyde de titane TiO 2 ; - plus de 21% et moins de 50% de zircone; - plus de 1% et moins de 10% d'un composé choisi dans le groupe constitué par MgO, CaO, Fe 2 O 3 , Cr 2 O 3 , MnO 2 , La 2 O 3 , Y 2 O 3 , Ga 2 O 3 et leurs mélanges; - moins de 20% de silice SiO 2 ; - moins de 10% d'un composé choisi dans le groupe constitué par les oxydes alcalins, alcalino-terreux et leurs mélanges; - moins de 2% d'autres espèces oxydes; les pourcentages étant des pourcentages en masse sur la base des oxydes. Application à la fusion de métaux.
摘要翻译:具有以下化学成分的熔融晶粒: - 大于10%且小于50%的氧化铝Al 2 O 3; - 超过10%且小于50%的氧化钛TiO2; - 超过21%且小于50%的氧化锆; - 选自MgO,CaO,Fe 2 O 3,Cr 2 O 3,MnO 2,La 2 O 3,Y 2 O 3,Ga 2 O 3及其混合物中的化合物的1%以上10%以下。 - 少于20%的二氧化硅SiO2; - 少于10%的选自碱金属氧化物,碱土金属氧化物及其混合物的化合物; - 少于2%的其他氧化物种; 百分比是以氧化物为基准的重量百分数。 在金属熔化中的应用。
摘要:
본 발명은 비납계 압전 세라믹 조성물과 그의 제조방법에 관한 것으로서, 센서 및 액추에이터용 비납계 압전 세라믹 조성물에 있어서, 원료용 비납계 압전 세라믹을 각각 제조한 후 혼합, 분쇄, 건조, 소결시켜, 상유전체상 및 강유전체상이 혼합되고 이러한 상들이 코어-셀 구조로 존재하는 압전 성형물을 제조함으로써, 상기 압전 성형물에 전계 인가시 셀 부위에서 상유전체상에서 강유전체상으로의 상변이와 코어 부위에서 강유전체상의 도메인 재배열이 발생되어 고변형율을 나타내는 것을 특징으로 하는 센서 및 액추에이터용 비납계 압전 세라믹 조성물을 기술적 요지로 한다. 이에 의해 최종 압전 성형물이 최소 두 가지 이상을 상을 가지면서, 전계 인가시 상변이와 도메인 재배열이 발생되어 고변형율에 의한 유전율의 증가와 압전상수(d 33 )가 우수하여, 충격 센서, 가속도센서, 초음파 센서, 적층형 압전액추에이터, 압전변압기 및 초음파 진동자, 착화소자와 같은 고신뢰성 압전부품을 제조할 수 있으며, 납에 의한 환경 오염을 감소시킬 수 있는 이점이 있다.
摘要:
The invention relates to a mixture of melted grains having the following chemical composition, in weight percent on the basis of the oxides: less than 55% of Al2O3, more than 35% and less than 80% of TiO2, more than 1% and less than 20% of MgO, more than 0.7% and less than 20% of ZrO2, less than 20% of SiO2, said grains also having the following composition, in mole percent on the basis of the single oxides Al2O3, TiO2, MgO, and ZrO2: 90
摘要翻译:本发明涉及具有以下化学组成的熔融颗粒的混合物,其基于氧化物以重量百分比表示:小于55%的Al 2 O 3,大于35%且小于80%的TiO 2,大于1%且小于 ,MgO小于20%,ZrO2大于0.7%小于20%,SiO2小于20%,所述晶粒还具有下列组成,以单一氧化物Al2O3,TiO2,MgO和 ZrO 2:90 <2a + 3m <110,100 + a 2 O 3,t是TiO 2的摩尔百分比,m是MgO的摩尔百分比,并且zr是ZrO 2的摩尔百分比。 本发明还涉及由这种熔融颗粒获得的陶瓷材料。
摘要:
This invention relates to a new group of complex ceramic oxides and a process for their production. This group of novel complex ceramic oxides are of the general formula Mg 2 MM'0 6+X , where M = Rare Earth metal ion sor Yttrium or Lanthanum and M' = Sn, Sb, Zr, Hf, Ta, and Nb; and where - 0.5 2 MM'0 6+X . Minor variations in the compositions up to 8% in one metal ions may be tolerated for the formation of the required phase. (b) The compounds employed in step (i) may be selected from their oxides, carbonates, chlorides, alkoxides, nitrates, sulfates etc.; preferably the salts used are selected from oxides or carbonates. (c) The mixture obtained in step(i) may be ball milled or mixed with a wetting medium. The wetting medium may be water, alcohol, acetone or any other organic solvent. The resultant ball milled slurry may be dried to remove the liquid and obtain dry powder, (d) Heating the resultant mixture to a temperature in the range 1000-1600°C, as required for different duration ranging from 3 hours to 50 hours, either in a single step or by taking out the reactant after few hours of heating, checking for phase formation and heating it again after grinding, if necessary. Up to a maximum of 5 intermediate grindings may be required.
摘要:
A method of producing very high purity fine powders (104) of oxides, carbides, nitrides, borides, chalcogenides, metals, and alloys. The purity of powders (108) produced by the method exceeds 99.9 %, preferably 99.999 %, more preferably 99.99999 %, and most preferably 99.999999999 %. Fine powders produced are of size less than 100 microns, preferably less than 10 micron, more preferably less than 1 micron, and most preferably less than 100 nanometers. Methods for producing such powders in high volume, low-cost, and reproducible quality are also outlined. The very high purity, fine powders are envisioned to be useful in various applications such as biomedical, sensor, electronic, electrical, photonic, thermal, piezo, magnetic, catalytic and electrochemical products.
摘要:
The disclosed invention relates to piezoelectric rare earth doped Pb(Zr,Ti)O3-Pb(Mn,Sb)O3 compounds including (zPb(ZrwTi(1-w))O3-(1-z)Pb(Mn1/3Sb2/3)O3 + REx) where z is