CN1053517C - 高性能中温烧结片式多层瓷介电容器瓷料 - Google Patents

高性能中温烧结片式多层瓷介电容器瓷料 Download PDF

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CN1053517C
CN1053517C CN96117343A CN96117343A CN1053517C CN 1053517 C CN1053517 C CN 1053517C CN 96117343 A CN96117343 A CN 96117343A CN 96117343 A CN96117343 A CN 96117343A CN 1053517 C CN1053517 C CN 1053517C
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porcelain
ceramic capacitor
temperature
ceramic material
moderate temperature
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CN1186313A (zh
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梁力平
陈锦清
李富胜
欧明
祝忠勇
杨仕基
莫天桥
庞溥生
吴小飞
赖永雄
顾碎难
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Guangdong Zhaoqing Fenghua Electronic Engineering Development Co Ltd
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Guangdong Zhaoqing Fenghua Electronic Engineering Development Co Ltd
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Abstract

一种中温烧结式多层瓷介电容器瓷料,其以BaTiO3为主晶相,用2Bi2O3·3TiO2来调整及降低瓷料的烧成温度,同时加入低溶物硅硼酸玻璃,且加入过渡元素氧化物。本发明流延制得的膜片光平、透光均匀、无针孔、气泡、龟裂现象,其介质常数(20度)=2600,介质损耗≤120×10-4;绝缘电阻率ρν>1012Ω·cm;电容量温度变化率(-55~+125度≤±10%,适合生产线应用。

Description

高性能中温烧结片式多层瓷介电容器瓷料
本发明涉及一种电容器瓷料,特别是多层片状瓷介电容器瓷料。
中温烧结多层片状瓷介电容器,其烧成过程是瓷料与内电极一起烧成,这就要求内电极的熔点必须高于瓷料的烧成温度,用贵金属Pt.Pd等作内电极成本高,用Pd-Ag.Au等电极材料,成本较低,但要求介质瓷料的烧温必须低于1160度,才能与介质瓷料相匹配。
有采用铁电材料BaTiO3为主晶相的瓷料,来提高介电常数和介电性能,但由于它的工艺性能差、电气性能仍达不到要求,无法实际生产应用。
本发明的目的是克服现有技术中的缺点,提供一种高性能中温烧结片式多层瓷介电容器瓷料,其制成的多层片状瓷介电容器,产品一致性好、成品率高、介电性能优良,满足生产线应用。
本发明的配方(重量比)组成为:
  BaTiO3    86.0~93.0% (wt)
  Bi2O3      2.5~8.5%  (wt)
  TiO2       1.6~3.5%  (wt)
  Nb2O5      0.7~2.0%  (wt)
  MnO2       0.8~2.0%  (wt)
硅酸铅玻璃     1.0~3.0%
其中硅酸铅玻璃的组成(重量比)为:
    Pb3O4        67~80%
    SiO2           1~4%
    H3BO3         15~22%
    ZnO              3~7%
   最佳配方组成为:(重量比)
    BaTiO3       88~90%
    Bi2O3         5~6%
    TiO2        2.2~2.6%
    Nb2O5       0.8~1.4%
    MnO2       0.12~0.14%
    硅酸铅玻璃    1.2~2.3%
本发明最佳比例配方(重量百分比),如下:
     材料样    名称品号 BaTiO3 Bi2O3 TiO2 Nb2O5 MnO2 硅酸铅玻璃
    12345678     8687888890909393     6.56.55.55.54.04.02.02.0   3.53.23.23.22.82.61.51.5     1.861.351.41.31.20.881.01.0  0.140.150.100.140.150.120.10.18   2.01.81.81.861.852.42.42.32
将上述1至8的样品均在箱式炉中焙烧,焙烧温度列于下表,并列出它们的电气性能。
 样品   ε   DF(×10-4)   IR(MΩ)   ΔC/C  焙烧温度(℃)
   12  23002300     <80<80  >105>105  <±15%<±15%     11201120
   3  2350     <90  >105  <±15%     1130
   45  24002600     <90<100  >105>105  <±15%<±15%     11301130
   6  2300     <100  >105  <±15%     1130
   45  24002600     <120<120  >5×105>5×105  <±15%<±15%     11401140
本瓷料是以BaTiO3为主晶相,用2Bi2O3.3TiO2的铋层结构来调整及降低瓷料的烧成温度,同时加入低溶物硅硼酸玻璃,加过渡元素氧化物。
上述BaTiO3是采用固相法合成的BaO/TiO2的摩尔比是1来
                         高温制备的,具体用: 合成温度在1200度~1280度,保温2小时。
将上述配方经一定比例称取,经超细球磨成超细粉粒(D50<1μm),获得合适的颗粒度和混合均匀的,电性能合格的瓷粉。
本发明属BaTiO3-2Bi2O3·3TiO3系材料,BaTiO3具有强的铁电性,有很高的介电常数,从附图1可知峰值可达5000~6000,且居里温度在100度,Tc—居里温度。由于本发明加入铋层化合物,即2Bi2O3.3TiO2来调整容量温度特性及降低瓷料的烧成温度;加入的铋层化合物是一种低介相,也是低溶相,介质在高温动力作用下,高介的BaTiO3的铁电相晶粒会被这低相包裹着,铁电相的电致应变必然受到抑制,因而居里峰也必然受到压抑,如附图2,陶瓷模拟结构,其中1-低ε相Bi4(Ti3O12),2-高ε相BaTiO3
加入Bi2O3·nTiO2的铋层结构的化合物来降低BaTiO2为主的瓷料烧成温度及改善瓷料的容量温度特性,如附图3所示,随着铋层化合物含量的增加,烧成温度随之下降,当其量达0.05左右时,随着含量的增加,烧成温度变化不明显,而介电常数随含量增加而降低。
本发明与美国TAM公司该型号瓷料主要性能比较,见附图3、附图4。
本发明流延制得的膜片光平、透光均匀,无针孔、气泡、龟裂现象。其介电常数(20度)=2600;介质损耗≤120×10-4;绝缘电阻率ρυ>1012Ω·cm;电容量温度变化率(-55~+125度)≤±10%,适合生产线应用。
本说明书所述度数为摄氏度数。

Claims (2)

1.一种中温烧结片式多层瓷介电容器瓷料,其特征在于其配方组成(重量比)为:
  BaTiO3       86.0~93.0%  (wt)
  Bi2O3        2.5~8.5%   (wt)
  TiO2        1.6~3.5%   (wt)
  Nb2O5       0.7~2.0%   (wt)
  MnO2        0.8~2.0%   (wt)
硅酸铅玻璃       1.0~3.0%   (wt)
其中硅酸铅玻璃的组成(重量比)为:
  Pb3O4       67~80%    (wt)
  SiO2         1~4%     (wt)
  H3BO3       15~22%    (wt)
  ZnO           3~7%     (wt)
2.根据权利要求1所述的中温烧结片式多层瓷介电容器瓷料,其特征在于所述最佳配方组成为:(重量比)
    BaTiO3        88~90%  (wt)
    Bi2O3          5~6%   (wt)
    TiO2         2.2~2.6% (wt)
    Nb2O5        0.8~1.4% (wt)
    MnO2        0.12~0.14%(wt)
    硅酸铅玻璃      1.2~2.3% (wt)
CN96117343A 1996-12-24 1996-12-24 高性能中温烧结片式多层瓷介电容器瓷料 Expired - Fee Related CN1053517C (zh)

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CN1053517C true CN1053517C (zh) 2000-06-14

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86103391A (zh) * 1985-05-03 1986-10-29 谭氏陶器有限公司 具有高介电常数和平坦的温度系数特性的介质陶瓷配方
CN1067037A (zh) * 1992-05-11 1992-12-16 上海无线电六厂 高介电常数、高稳定、低损耗的陶瓷介质材料及制造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86103391A (zh) * 1985-05-03 1986-10-29 谭氏陶器有限公司 具有高介电常数和平坦的温度系数特性的介质陶瓷配方
CN1067037A (zh) * 1992-05-11 1992-12-16 上海无线电六厂 高介电常数、高稳定、低损耗的陶瓷介质材料及制造方法

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