Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The invention discloses a preparation method of CaCu3Ti4O12 (CCTO) powder and a ceramic sintering method, and aims to solve the technical problem of high dielectric loss of CCTO ceramic prepared in the prior art. The preparation method comprises the following steps: taking CaCO3, CuO and TiO2 as raw materials, uniformly mixing the raw materials, sequentially carrying out heat-preservation calcination in an air atmosphere and a hydrogen-containing mixed gas atmosphere in an atmosphere furnace, naturally cooling along with the furnace temperature in the hydrogen-containing atmosphere, and grinding to obtain the CCTO powder. The invention also discloses a ceramic sintering method of the obtained CCTO powder, the method is characterized by comprising the following steps: preparing a ceramic blank from the obtained CCTO powder, putting the ceramic blank into an atmosphere furnace, heating to 1070-1100 DEG C in an air atmosphere, keeping the temperature, introducing a mixed gas containing high-content oxygen into the atmosphere furnace after 8-10 hours, and quickly cooling to 700 DEG C, and naturally cooling to room temperature to obtain the CCTO ceramic. The dielectric loss of the CCTOceramic prepared by the method is less than 0.015, the dielectric constant is up to 40000 or above, and the comprehensive dielectric property of the CCTO ceramic is obviously improved.
本发明公开了一种CaCu3Ti4O12（CCTO）粉体制备及陶瓷烧结方法，以解决现有技术所制备的CCTO陶瓷介电损耗较高的技术问题。本发明采用CaCO3、CuO、TiO2为原料，经过配料混合均匀后，在气氛炉中依次经过空气气氛下和含有氢气的混合气体气氛下的保温煅烧、含有氢气气氛下的随炉温自然冷却、研磨后得到CCTO粉体。本发明也公开了所得CCTO粉体的陶瓷烧结方法，其特征在于将所得的CCTO粉体制成陶瓷坯体后放入气氛炉中，在空气气氛下升温到1070～1100℃时开始保温，并在保温8～10小时后向气氛炉中通入含有高含量氧气的混合气体并快速降温到700℃，之后自然冷却到室温得到CCTO陶瓷。采用本发明所制备的CCTO陶瓷的介电损耗小于0.015，同时介电常数高达40000以上，CCTO陶瓷的综合介电性能明显改善。
The invention discloses a preparation method of CaCu3Ti4O12 (CCTO) powder and a ceramic sintering method, and aims to solve the technical problem of high dielectric loss of CCTO ceramic prepared in the prior art. The preparation method comprises the following steps: taking CaCO3, CuO and TiO2 as raw materials, uniformly mixing the raw materials, sequentially carrying out heat-preservation calcination in an air atmosphere and a hydrogen-containing mixed gas atmosphere in an atmosphere furnace, naturally cooling along with the furnace temperature in the hydrogen-containing atmosphere, and grinding to obtain the CCTO powder. The invention also discloses a ceramic sintering method of the obtained CCTO powder, the method is characterized by comprising the following steps: preparing a ceramic blank from the obtained CCTO powder, putting the ceramic blank into an atmosphere furnace, heating to 1070-1100 DEG C in an air atmosphere, keeping the temperature, introducing a mixed gas containing high-content oxygen into the atmosphere furnace after 8-10 hours, and quickly cooling to 700 DEG C, and naturally cooling to room temperature to obtain the CCTO ceramic. The dielectric loss of the CCTOceramic prepared by the method is less than 0.015, the dielectric constant is up to 40000 or above, and the comprehensive dielectric property of the CCTO ceramic is obviously improved.
本发明公开了一种CaCu3Ti4O12（CCTO）粉体制备及陶瓷烧结方法，以解决现有技术所制备的CCTO陶瓷介电损耗较高的技术问题。本发明采用CaCO3、CuO、TiO2为原料，经过配料混合均匀后，在气氛炉中依次经过空气气氛下和含有氢气的混合气体气氛下的保温煅烧、含有氢气气氛下的随炉温自然冷却、研磨后得到CCTO粉体。本发明也公开了所得CCTO粉体的陶瓷烧结方法，其特征在于将所得的CCTO粉体制成陶瓷坯体后放入气氛炉中，在空气气氛下升温到1070～1100℃时开始保温，并在保温8～10小时后向气氛炉中通入含有高含量氧气的混合气体并快速降温到700℃，之后自然冷却到室温得到CCTO陶瓷。采用本发明所制备的CCTO陶瓷的介电损耗小于0.015，同时介电常数高达40000以上，CCTO陶瓷的综合介电性能明显改善。
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