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The invention discloses a negative pressure sintering method for preparing copper calcium titanate CaCu3Ti4O12 (CCTO) ceramic with low dielectric loss and high dielectric constant, and aims to solve the technical problem of high dielectric loss of CCTO ceramic prepared by the conventional sintering technology. According to the technical scheme, a CCTO ceramic blank is subjected to,in an atmospherefurnace, a heating stage 1 in a normal-pressure air atmosphere, a heat preservation stage 1 in the normal-pressure air atmosphere, a heating stage 2 in a negative-pressure air atmosphere, a heat preservation stage 2 in the negative-pressure air atmosphere, a cooling stage 1 in an oxygen-nitrogen mixed atmosphere with high-content oxygen, a heat preservation stage 3 in an oxygen-nitrogen mixed atmosphere with high oxygen content and a cooling stage 2 in a furnace cooling process in a normal-pressure air atmosphere to obtain the CCTO ceramic. The dielectric constant of the CCTO ceramic obtainedby the technical scheme of the invention is improved, the dielectric loss is obviously reduced, and the dielectric loss value is as low as 0.02.
本发明公开了一种制备低介电损耗、高介电常数的钛酸铜钙CaCu3Ti4O12（CCTO）陶瓷的负压烧结方法，以解决现有烧结技术制备的CCTO陶瓷介电损耗较高的技术问题。本发明的技术方案是：CCTO陶瓷坯体在气氛炉中经过常压空气气氛下的升温阶段1、常压空气气氛下的保温阶段1、负压空气气氛下的升温阶段2、负压空气气氛下的保温阶段2、高含量氧气的氧氮混合气氛下的降温阶段1、高含量氧气的氧氮混合气氛下的保温阶段3和常压空气气氛下随炉冷却的降温阶段2后而得到CCTO陶瓷。本发明技术方案所得的CCTO陶瓷不仅介电常数得到提高，而且介电损耗明显降低，介电损耗值低达0.02。
The invention discloses a negative pressure sintering method for preparing copper calcium titanate CaCu3Ti4O12 (CCTO) ceramic with low dielectric loss and high dielectric constant, and aims to solve the technical problem of high dielectric loss of CCTO ceramic prepared by the conventional sintering technology. According to the technical scheme, a CCTO ceramic blank is subjected to,in an atmospherefurnace, a heating stage 1 in a normal-pressure air atmosphere, a heat preservation stage 1 in the normal-pressure air atmosphere, a heating stage 2 in a negative-pressure air atmosphere, a heat preservation stage 2 in the negative-pressure air atmosphere, a cooling stage 1 in an oxygen-nitrogen mixed atmosphere with high-content oxygen, a heat preservation stage 3 in an oxygen-nitrogen mixed atmosphere with high oxygen content and a cooling stage 2 in a furnace cooling process in a normal-pressure air atmosphere to obtain the CCTO ceramic. The dielectric constant of the CCTO ceramic obtainedby the technical scheme of the invention is improved, the dielectric loss is obviously reduced, and the dielectric loss value is as low as 0.02.
本发明公开了一种制备低介电损耗、高介电常数的钛酸铜钙CaCu3Ti4O12（CCTO）陶瓷的负压烧结方法，以解决现有烧结技术制备的CCTO陶瓷介电损耗较高的技术问题。本发明的技术方案是：CCTO陶瓷坯体在气氛炉中经过常压空气气氛下的升温阶段1、常压空气气氛下的保温阶段1、负压空气气氛下的升温阶段2、负压空气气氛下的保温阶段2、高含量氧气的氧氮混合气氛下的降温阶段1、高含量氧气的氧氮混合气氛下的保温阶段3和常压空气气氛下随炉冷却的降温阶段2后而得到CCTO陶瓷。本发明技术方案所得的CCTO陶瓷不仅介电常数得到提高，而且介电损耗明显降低，介电损耗值低达0.02。
Negative pressure sintering method of CaCu3Ti4O12 ceramic with low dielectric loss
一种低介电损耗CaCu3Ti4O12陶瓷的负压烧结方法
2021-03-19
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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