CN114394823A - 一种低温烧结高介电性能95Al2O3微波介质陶瓷 - Google Patents

一种低温烧结高介电性能95Al2O3微波介质陶瓷 Download PDF

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CN114394823A
CN114394823A CN202210115808.9A CN202210115808A CN114394823A CN 114394823 A CN114394823 A CN 114394823A CN 202210115808 A CN202210115808 A CN 202210115808A CN 114394823 A CN114394823 A CN 114394823A
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李蔚
陶宏磊
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East China University of Science and Technology
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Abstract

本发明公开了一种低温烧结高介电性能95Al2O3微波介质陶瓷及其制造方法。其特点是以95.0wt%高纯Al2O3粉体为主要原料加上5.0wt%由适量Nb2O5、CuO、ZrO2混合而成的烧结助剂，混合均匀并成型后，放入马弗炉中，在950~1025℃下烧结2‑5h，即可得到高致密度、高介电性能的95Al2O3微波介质陶瓷（相对密度≥98%，介电常数：9.6~9.9，Q×f值：13000GHz~16000GHz）。本发明可以在较低温度下获得高致密度、高介电性能的95Al2O3微波介质材料，且工艺简单、操作方便，有利于降低成本和大规模生产，同时对减少能源消耗、保护环境可持续发展有着重要的意义。

Description

一种低温烧结高介电性能95Al2O3微波介质陶瓷
技术领域
本发明涉及一种低温烧结高介电性能95Al2O3微波介质陶瓷及其制备方法，是一种电子陶瓷材料，可用于电子、通讯等领域。
背景技术
Al2O3陶瓷具有适当的介电常数、很高的Q×f值、机械强度高、绝缘性好、耐化学腐蚀等优点，长期以来广泛地被用做各种微波元器件的基板材料。但是，纯Al2O3陶瓷的烧结温度较高，一般在1500℃以上，不仅需要耗费巨大的能量，而且当需要和电极共烧时，必须采用贵金属做电极，成本很高。因此，大幅度降低Al2O3陶瓷的烧结温度，使其可采用铜、镍等贱金属作为共烧电极，对于降低能耗和成本具有重要意义。降低Al2O3陶瓷烧结温度的方法包括采用烧结活性高的纳米粉体、添加适当的烧结助剂和采用特种烧结技术等。其中，添加烧结助剂具有成本低、工艺简便的优点受到广泛重视。但是，现在很多烧结助剂虽然可以有效降低烧结温度，但却往往会导致材料的微波介电性能（如Q×f值）大幅下降，从而影响到实际应用。因此，寻找适当的烧结助剂、开发出烧结温度较低同时微波介电性能较高的Al2O3微波介质材料，具有重要意义。
发明内容
本发明的目的是提供一种低温烧结、介电性能优异的95Al2O3微波介质陶瓷。
为了实现上述目的，采用的技术方案如下：选用高纯Al2O3陶瓷粉体作为原料，加入由适量的Nb2O5、CuO、ZrO2混合而成的烧结助剂，混合均匀后压制成型，放入普通马弗炉中，升温至预定烧结温度后保温一段时间，即可制得密度高、表面光洁、介电性能优异的95Al2O3微波介质陶瓷。
在上述技术方案中，Al2O3粉体原料与烧结助剂的重量比为95：5。烧结助剂中，Nb2O5、CuO、ZrO2重量比为（8~10）：（3~4）：（1~2）。原料与助剂加去离子水后进行混合。混合在球磨机中进行，料：水：球（重量比）=1：2：3，混合时间为10~14h。样品烧结温度为950~1025℃，升温速率为2~5℃/min，保温时间为1~5h。烧结结束后自然冷却，即获得所需要的95Al2O3微波介质陶瓷。该95Al2O3陶瓷密度高（相对密度≥98%），微波介电性能优良（介电常数：9.6~9.9，Q×f值：13000GHz~16000GHz）。
本发明操作技术工艺简单方便，有利于降低成本和大规模生产，同时对减少能源消耗、保护环境可持续发展具有重要意义。
具体实施方式
以下对本发明的优选实施实例进行说明，应当理解为：此处所描述的优选实施实例仅用于说明和解释本发明，并不用于限定本发明。
实施方案一：一种低温烧结高介电性能95Al2O3微波介质陶瓷。以高纯Al2O3粉和商用Nb2O5粉、CuO粉、ZrO2粉为原料，按以下重量称量：Al2O3=95.0g，Nb2O5=3.0g，CuO=1.5g，ZrO2=0.5g，称量好放入球磨罐中，加入去离子水和研磨锆球，料：水：球（重量比）=1：2：3，放入球磨机上球磨12h。干燥后加入少量CMC粘结剂（重量约为粉体质量的5%），过80目筛后得到混合粉料。将粉料干压成圆柱状生坯，放入马弗炉中，以2℃/min的升温速率加热至1000℃下烧结5h，自然冷却后即可得到Al2O3微波介质陶瓷材料。
将制得的95Al2O3微波介质陶瓷进行性能测试，结果显示：这种低温烧结的95Al2O3微波介质陶瓷的体积密度可达到3.95g/cm3（相对密度为99wt%），介电常数为9.79，Q×f值达到15541.5GHz。

Claims (3)

1.一种低温烧结高介电性能95Al2O3微波介质陶瓷及其制造方法，其特征在于：
（1）以高纯Al2O3粉体为主要原料，加入由适量Nb2O5、CuO、ZrO2混合而成的烧结助剂；
（2）将步骤（1）的主要原料和烧结助剂一起在球磨罐中加水球磨，干燥后过筛造粒得到混合粉料；
（3）将步骤（2）得到的混合粉料成型后，在一定温度下烧结，即可得到所需的Al2O3微波介质材料。
2.根据权利要求1所述的一种低温烧结高介电性能95Al2O3微波介质陶瓷，其特征在于：步骤（1）中，Nb2O5、CuO、ZrO2重量比为（8~10）：（3~4）：（1~2）；步骤（2）中，主要原料与烧结助剂的配比为95：5（重量比），所述球磨时间为10~14h，球磨介质为氧化锆研磨球和去离子水，料：水：球（重量比）=1：2：3，干燥温度为85℃；在步骤（3）中，样品烧结温度为950 ~1025℃，升温速率为2~5℃/min，保温时间为2~5h。
3.根据权利要求1所述的一种低温高介电性能95Al2O3微波介质陶瓷，其特征在于：这种低温烧结的95Al2O3微波介质陶瓷有着较高的致密度（相对密度≥98%），介电性能优异（介电常数：9.6~9.9，Q×f值：13000GHz~16000GHz）。
CN202210115808.9A 2022-02-07 2022-02-07 一种低温烧结高介电性能95Al2O3微波介质陶瓷 Pending CN114394823A (zh)

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