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Strontium barium niobate-based glass ceramic energy storage material and preparation method thereof
Inactive Publication Date: 2016-03-16
TONGJI UNIV
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The patent obtains glass-ceramic dielectric materials with different properties by adjusting the Sr / Ba ratio. Due to its composition, the dielectric coefficient of the prepared material will be as low as 21, and the adjustment range is 21-143. The dielectric constant has a large fluctuation range and the energy storage density The highest can only reach 5.71J / cm 3 , in addition, due to more addition of B 2 o 3 The amount of grain agglomeration is more serious
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Embodiment 1
[0038] The preparation method of the strontium barium niobate based glass-ceramic material with high energy storage density adopts the following steps:
[0039] 1) BaCO with a purity greater than 99.0wt% 3 , SrCO 3 , Nb 2 o 5 , SiO 2 、Al 2 o 3 , B 2 o 3 , is raw material batching, the molar percentage of each above-mentioned component is 20%, 20%, 20%, 35%, 5%, 0%, after mixing by ball milling for 15 hours, drying, and melting at 1600°C for 3 hours;
[0040] 2) Pouring the high-temperature melt obtained in step 1) into a metal mold, annealing for stress relief at 700°C for 5 hours, and then cutting to obtain glass flakes with a thickness of about 1.5 mm;
[0041] 3) The glass flakes prepared in step 2) were kept at 1120° C. for 3 hours for controlled crystallization to obtain glass ceramics.
[0042] The DSC of the sample that present embodiment makes is as figure 1 As shown, the DSC curve of this component has two very obvious exothermic peaks; XRD is as follows f...
Embodiment 2
[0044] The preparation method of the strontium barium niobate based glass-ceramic material with high energy storage density adopts the following steps:
[0045] 1) BaCO with a purity greater than 99.0wt% 3 , SrCO 3 , Nb 2 o 5 , SiO 2 、Al 2 o 3 , B 2 o 3 , is raw material batching, and the molar percentage of above-mentioned each component is 20%, 20%, 20%, 33.5%, 5%, 1.5%, after 15 hours of ball mill mixing, drying, melting at 1550 DEG C for 2 hours;
[0046] 2) Pouring the high-temperature melt obtained in step 1) into a copper mold, annealing for stress relief at 650° C. for 5 hours, and then cutting to obtain glass flakes with a thickness of about 1.5 mm;
[0047] 3) The glass flakes prepared in step 2) were kept at 1120° C. for 3 hours for controlled crystallization to obtain glass ceramics.
[0048] The DSC of the sample that present embodiment makes is as figure 1 As shown, the DSC curve of this component has a broad exothermic peak and XRD scanning spectrum co...
Embodiment 3
[0051] The preparation method of the strontium barium niobate based glass-ceramic material with high energy storage density adopts the following steps:
[0052] 1) BaCO with a purity greater than 99.0wt% 3 , SrCO 3 , Nb 2 o 5 , SiO 2 、Al 2 o 3 , B 2 o 3 , is raw material batching, and the molar percentage of above-mentioned each component is 20%, 20%, 20%, 32.5%, 5%, 2.5%, after mixing by ball milling for 15 hours, drying, melting at 1550 ℃ for 2 hours;
[0053] 2) Pouring the high-temperature melt obtained in step 1) into a copper mold, annealing for stress relief at 650° C. for 5 hours, and then cutting to obtain glass flakes with a thickness of about 1.5 mm;
[0054] 3) The glass flakes prepared in step 2) were kept at 1120° C. for 3 hours for controlled crystallization to obtain glass ceramics.
[0055] The DSC of the sample that present embodiment makes is as figure 1 Shown, XRD as figure 2 As shown, SEM as image 3 As shown, the dielectric properties are as ...
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technical field [0001] The invention belongs to the field of dielectric energy storage materials, in particular to a barium strontium niobate-based glass ceramic energy storage material and a preparation method thereof. Background technique [0002] With the development of pulse technology, dielectric energy storage capacitors have higher and higher requirements in terms of high energy storage density, fast charge and discharge performance, stability, and systemminiaturization and portability. In order to meet these requirements of dielectric energy storage capacitors The main purpose of current research on energy storage dielectrics is to prepare dielectric materials with high dielectric constant and high breakdown field strength. Therefore, material workers from various countries are actively exploring and researching dielectric materials with high dielectric constant, low electrical loss and high compressive strength. At present, glass-ceramic materials are considered t...
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