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 PDFInfo
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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
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)。
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