CN112521135A - 一种低温烧结Al2O3微波介质材料 - Google Patents

一种低温烧结Al2O3微波介质材料 Download PDF

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CN112521135A
CN112521135A CN202110041086.2A CN202110041086A CN112521135A CN 112521135 A CN112521135 A CN 112521135A CN 202110041086 A CN202110041086 A CN 202110041086A CN 112521135 A CN112521135 A CN 112521135A
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dielectric material
microwave dielectric
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李蔚
董光宇
成臣
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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Al2O3微波介质材料及其制造方法。其特点是以99.0wt%高纯Al2O3粉体为主要原料加上1.0wt%由适量CuO、TiO2、MgO混合而成的烧结助剂，混合均匀并成型后，放入马弗炉中，在1150℃~1250℃下烧结4~6h，即可得到高致密度、介电性能优异的Al2O3微波介质材料（相对密度≥97%，介电常数：9.7~10.0，Q×f值：86000GHz~110000GHz）。本发明可在较低温度下获得致密度高、介电性能优良的Al2O3微波介质材料，且工艺简单、操作方便，有利于大规模生产，同时对减少能源消耗、保护环境可持续发展有着重要意义。

Description

一种低温烧结Al2O3微波介质材料
技术领域
本发明涉及一种低温烧结Al2O3微波介质材料及其制造方法，是一种电子陶瓷材料，可用于微波通讯等领域。
背景技术
Al2O3作为一种常见的陶瓷材料，因其优异的性能，例如：高硬度、高机械强度、耐腐蚀性、良好的导热性和很低的介电损耗等，广泛应用在化工、医疗、航天和通信等领域。在当前通信技术飞速发展的5G时代，Al2O3陶瓷作为微波介质材料已经应用于集成电路基板、谐振器和滤波器等器件。但是，Al2O3陶瓷烧结温度较高，不利于环保和节能，也不利于降低成本。因此，近年来人们常利用加入低烧玻璃等手段来降低其烧结温度。但其结果往往是：虽然可以有效地降低Al2O3的烧结温度，却也会导致其微波介电性能特别是Q×f值大幅下降，从而影响其使用。所以，开发烧结温度较低、同时又可以保证微波介电性能优良的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Al2O3微波介质材料。
为了实现上述目的，采用的技术方案如下：选用高纯Al2O3陶瓷粉体为原料，加入由适量CuO、TiO2、MgO混合而成的烧结助剂，成型后放入普通马弗炉中，升温至预定烧结温度后保温一定时间，即可制得高密度、表面光洁，介电性能优异的Al2O3微波介质材料。
在上述技术方案中，Al2O3粉体原料与烧结助剂的重量比为99：1，烧结助剂中，CuO、TiO2、MgO重量比为(2~4):(5~7):(0.4~0.6)。原料与助剂加水后进行混合。混合在球磨机中进行，料:水:球（重量比）=1:2:3，混合时间为12~24h。预定烧结温度为1150℃~1250℃，保温时间为4~6h。烧结结束后自然冷却，即获得所需Al2O3微波介质材料。该材料密度高（相对密度≥97%），微波介质性能优良（介电常数：9.7~10.0，Q×f值：86000GHz~110000GHz）。
本发明技术工艺简单、操作方便，有利于大规模生产，同时对减少能源消耗、保护环境可持续发展有着重要意义。
具体实施方式
以下对本发明的优选实施例进行说明，应当理解为：此处所描写的优选实施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的Al2O3微波介质材料。以高纯Al2O3粉，商用CuO粉、TiO2粉、MgO粉为原料，按以下重量称量：Al2O3=99.0g，CuO=0.30g，TiO2=0.65g，MgO=0.05g，称量好的粉料装入球磨罐中，加入去离子水和研磨球（料:水:球=1:2:3）放在球磨机上球磨12h。干燥后加入少量CMC粘结剂，过80目筛后得到混合粉料。将粉料干压成圆柱状生坯，在1150℃下烧结5h，冷却后即可得到Al2O3微波介质材料。
将制得的Al2O3微波介质材料进行性能测试，结果显示：这种低温烧结的Al2O3陶瓷材料体积密度可达3.86 g/cm3，其介电常数为9.77，Q×f值达到109000GHz。

Claims (5)

1.一种低温烧结Al2O3微波介质材料及其制备工艺，其特征在于：
（1）以高纯Al2O3粉体为主要原料，加入由适量CuO、TiO2、MgO混合而成的烧结助剂；
（2）将步骤（1）中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Al2O3微波介质材料。
2.根据权利要求1所述一种低温烧结Al2O3微波介质材料，其特征在于：步骤（1）中，CuO、TiO2、MgO的重量比为(2~4):(5~7):(0.4~0.6)。
3.根据权利要求1所述一种低温烧结Al2O3微波介质材料，其特征在于：步骤（2）中，主要原料与烧结助剂的配比为：99:1（重量比），所述球磨时间为12~24h，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80℃。
4.根据权利要求1所述一种低温烧结Al2O3微波介质材料，其特征在于：在步骤（3）中，样品烧结温度为1150℃~1250℃，升温速度为2~5℃/min，保温时间为4~6h。
5.根据权利要求1所述一种低温烧结Al2O3微波介质材料，其特征在于：这种低温烧结的Al2O3微波介质材料有着较高的致密度(相对密度≥97%)，介电性能优异（介电常数：9.7~10.0，Q×f值：86000GHz~110000GHz）。
CN202110041086.2A 2021-01-13 2021-01-13 一种低温烧结Al2O3微波介质材料 Pending CN112521135A (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114394825A (zh) * 2021-12-22 2022-04-26 西北工业大学宁波研究院 一种陶瓷材料及其制备方法和应用

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114394825A (zh) * 2021-12-22 2022-04-26 西北工业大学宁波研究院 一种陶瓷材料及其制备方法和应用
CN114394825B (zh) * 2021-12-22 2023-10-31 西北工业大学宁波研究院 一种陶瓷材料及其制备方法和应用

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