利用烧结过程中固相反应产生的额外烧结推动力,在1 200 ℃、常压烧结的条件下,通过混相烧结的方法成功制备了晶粒均匀、致密的纯相Ba₄Ti₁₃O₃₀陶瓷,研究了Ba₄Ti₁₃O₃₀相的合成规律、烧结性能及其显微结构的演变规律,并表征了Ba₄Ti₁₃O₃₀材料的介电性能。结果表明,用固相反应法合成的BaTiO₃粉体与TiO₂在1 150 ℃下即可合成Ba₄Ti₁₃O₃₀相,且在1 150~1 250 ℃温度范围内均生成单相。当烧结温度为1 200 ℃时,Ba₄Ti₁₃O₃₀陶瓷的相对密度达到最大值95 %,此时试样的微波性能最佳,其介电常数和品质因数Q×f分别为40和66 273,其品质因数Q×f值远高于文献报道的13 000;但当烧结温度提高到 1 230 ℃时陶瓷试样体密度略有下降并出现晶粒异常长大的现象,微波性能也随之急剧恶化,这是由其显微结构的变化所致。

Dense Ba₄Ti₁₃O₃₀ ceramic with uniform grains and pure phase is successfully fabricated via a mixed-phase sintering method at 1 200℃ and normal pressure,which making use of the additional sintering impetus provided by the solid-phase reaction during the solid-phase sintering process.The phase formation rule,sintering performance and microstructure evolution rule of Ba₄Ti₁₃O₃₀ ceramic are studied,and the dielectric property is characterized.Results show that Ba₄Ti₁₃O₃₀ phase can be synthesized at 1 150℃ by using BaTiO₃ powder synthesized through the solid-phase reaction method and with TiO₂ powder as regent.A single phase has been always formed during the temperature range of 1 150-1 250℃.As the sintering temperature is 1 200℃,the relative density of Ba₄Ti₁₃O₃₀ ceramic obtained reaches a maximum value of 95 %,its microwave property is the best,and its dielectric constant and figure of merit Q×f are 40 and 66 273,respectively.Its quality factor is much higher than 13 000,the reported value.However,when the sintering temperature increases slightly to 1 230℃,the relative density of the ceramic sample decreases slightly,the phenomenon of abnormal grain growth occurs,and the microwave property deteriorates sharply,possibly caused by the change of its microstructure.

王家强(1997-),男,硕士生,研究方向为介电陶瓷,1587138851@qq.com