CN104311001A - 一种x8r型多层陶瓷电容器介质的制备方法 - Google Patents

一种x8r型多层陶瓷电容器介质的制备方法 Download PDF

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CN104311001A
CN104311001A CN201410505020.4A CN201410505020A CN104311001A CN 104311001 A CN104311001 A CN 104311001A CN 201410505020 A CN201410505020 A CN 201410505020A CN 104311001 A CN104311001 A CN 104311001A
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multilayer ceramic
ceramic capacitor
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李玲霞
张宁
柳亚然
于经洋
陈俊晓
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Abstract

本发明公开了一种X8R型多层陶瓷电容器介质的制备方法，先将Na2CO3、Bi2O3、TiO2按质量比3:15:10配料，经球磨、烘干、煅烧，制得Na0.5Bi0.5TiO3粉末；该粉末与BaTiO3按质量比2～6:100配料，球磨、烘干、预烧后得到熔块；再将Nb2O5和ZnO按质量比3.3:1混合、锻烧、球磨、烘干后获得ZnNb2O6；将上述熔块按100g计，外加0.6～2.5g ZnNb2O6配料，球磨、烘干、造粒、压制成生坯；生坯于1220～1280℃烧结，烧渗制备电极，制得X8R型多层陶瓷电容器介质。本发明不含有毒物质，工艺简单、高介电常数、性能优良，且原材料成本较低、工作温度范围为-55℃～150℃，具有良好的应用前景。

Description

一种X8R型多层陶瓷电容器介质的制备方法
技术领域
本发明涉及一种以成分为特征的陶瓷组合物，具体涉及一种具有高温温度稳定性的X8R型多层陶瓷电容器介质材料及制备方法。
背景技术
多层陶瓷电容器(Multilayer Ceramic Capacitor)简称MLCC，具有体积小、绝缘电阻高、寄生电感低，高频特性好等诸多优点而备受青睐，特别适合于片式化表面贴装技术，可大大提高电路组装密度，缩小整机体积，这一突出的特性使MLCC成为世界上用量最大、发展最快的一种片式化元件。
近年来，国内外对X7R(工作温度范围-55℃-----125℃，容温变化率在15％以内)MLCC材料进行广泛研究并成功应用。然而，随着国防科技、汽车工业等的不断发展，对能在恶劣的工作环境下应用的MLCC的需求越来越广泛。如各种车载电子控制系统有ABS、发动机电子控制控制单元(ECU)灯，再如航空航天设备的发动机系统、大功率相控阵雷达等国防电子设备，其极端苛刻的工作环境要求MLCC的高温工作范围延伸到150℃以上，甚至更高。显然X7R型MLCC不能满足需求。
工艺复杂会增加材料研究的难度，甚至可能影响到其性能稳定性。因此开发组分简单、工艺简便，性能优良，环保的X8R型介质材料迫在眉睫。
发明内容
本发明的目的，是在目前的X7R(工作温度范围-55℃～125℃，容温变化率在15％以内)MLCC介质材料基础上，提供一种工艺过程简单、高介电常数、性能优良、高温工作范围延伸到150℃以上、环保的X8R型MLCC介质材料。
本发明通过如下技术方案予以实现。
一种X8R型多层陶瓷电容器介质的制备方法，具体步骤如下：
(1)将Na2CO3、Bi2O3、TiO2按质量比3:15:10配料，与去离子水混合球磨6h后烘干，于800℃煅烧，制得Na0.5Bi0.5TiO3粉末；
(2)将步骤(1)制得的Na0.5Bi0.5TiO3粉末与BaTiO3按质量比2～6:100配料，再与去离子水混合球磨4h，烘干后于800℃烧结，得到熔块；
(3)将Nb2O5和ZnO按质量比3.3:1，进行称量、混合、过筛后于950℃锻烧，再经球磨、烘干后获得ZnNb2O6；
(4)将步骤(2)得到的熔块按100g计，外加0.6～2.5g ZnNb2O6配料；
(5)将步骤(4)所配原料与去离子水混合球磨4h，再烘干；
(6)将步骤(5)烘干后的原料外加质量百分比为7％的石蜡造粒，然后过1000孔/cm2分样筛，压制成生坯；
(7)将步骤(6)压制的生坯经3.5h升温至550℃排蜡，再经1～4h升温至1220～1280℃烧结，保温1～6h；
(8)将步骤(7)所得制品的上下表面均匀涂覆银浆，经750℃烧渗制备电极，制得X8R型多层陶瓷电容器介质；
(9)测试该X8R型多层陶瓷电容器介质的介电性能。
所述步骤(1)或步骤(2)或步骤(3)或步骤(5)的烘干温度为120℃。
所述步骤(6)是在4～10Mpa压强下压制成生坯。
所述步骤(7)的烧结温度为1250℃。
本发明提供的多层陶瓷电容器介质材料不含有毒物质，工艺过程简单、高介电常数、性能优良，并且原材料成本较低、工作温度范围为-55℃～150℃，具有良好的应用前景。
具体实施方式
本发明所用原料均为分析纯原料，下面通过具体实施例对本发明作进一步说明。
将Na2CO3、Bi2O3、TiO2按质量比3:15:10配料，与去离子水混合球磨6h后烘干并于800℃煅烧，制得Na0.5Bi0.5TiO3粉末；将Na0.5Bi0.5TiO3粉末与BaTiO3按质量比2～6:100配料，与去离子水混合球磨4h，烘干并于800℃烧结，得到熔块；再将Nb2O5和ZnO按质量比3.3:1，进行称量、混合、过筛后于950℃锻烧，经球磨、烘干后获得ZnNb2O6；再将熔块按100g计，外加0.6～2.5g ZnNb2O6配料，与去离子水混合球磨4h并烘干，再外加质量百分比为7％的石蜡造粒，过1000孔/cm2分样筛，在4～10Mpa压强下压制成生坯；生坯经3.5h升温至550℃排蜡，在经过1～4h升温至1220～1280℃烧结，保温1～6h；再在制品上下表面均匀涂覆银浆，经750℃烧渗制备电极，制得X8R型多层陶瓷电容器介质。
本发明具体实施例的主要工艺参数及其介电性能详见表1。
表1
上述实施例的工作温度范围宽全部符合-55℃～150℃的工作要求。
本发明并不局限于上述实施例，很多细节的变化时可能的，但这并不因此违背本发明的范围和精神。

Claims (4)

1.一种X8R型多层陶瓷电容器介质的制备方法，具体步骤如下：
(1)将Na2CO3、Bi2O3、TiO2按质量比3:15:10配料，与去离子水混合球磨6h后烘干，于800℃煅烧，制得Na0.5Bi0.5TiO3粉末；
(2)将步骤(1)制得的Na0.5Bi0.5TiO3粉末与BaTiO3按质量比2～6:100配料，再与去离子水混合球磨4h，烘干后于800℃烧结，得到熔块；
(3)将Nb2O5和ZnO按质量比3.3:1，进行称量、混合、过筛后于950℃锻烧，再经球磨、烘干后获得ZnNb2O6；
(4)将步骤(2)得到的熔块按100g计，外加0.6～2.5g ZnNb2O6配料；
(5)将步骤(4)所配原料与去离子水混合球磨4h，再烘干；
(6)将步骤(5)烘干后的原料外加质量百分比为7％的石蜡造粒，然后过1000孔/cm2分样筛，压制成生坯；
(7)将步骤(6)压制的生坯经3.5h升温至550℃排蜡，再经1～4h升温至1220～1280℃烧结，保温1～6h；
(8)将步骤(7)所得制品的上下表面均匀涂覆银浆，经750℃烧渗制备电极，制得X8R型多层陶瓷电容器介质；
(9)测试该X8R型多层陶瓷电容器介质的介电性能。
2.根据权利要求1所述的一种X8R型多层陶瓷电容器介质的制备方法，其特征在于，所述步骤(1)或步骤(2)或步骤(3)或步骤(5)的烘干温度为120℃。
3.根据权利要求1所述的一种X8R型多层陶瓷电容器介质的制备方法，其特征在于，所述步骤(6)是在4～10Mpa压强下压制成生坯。
4.根据权利要求1所述的一种X8R型多层陶瓷电容器介质的制备方法，其特征在于，所述步骤(7)的烧结温度为1250℃。
CN201410505020.4A 2014-09-26 2014-09-26 一种x8r型多层陶瓷电容器介质的制备方法 Pending CN104311001A (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106966720A (zh) * 2017-04-18 2017-07-21 北京工业大学 Bnt‑bzn二元无铅电致应变陶瓷及制备

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
杨林波: "耐高温MLCC陶瓷材料的研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106966720A (zh) * 2017-04-18 2017-07-21 北京工业大学 Bnt‑bzn二元无铅电致应变陶瓷及制备

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Application publication date: 20150128