Bismuth niobate-based glass ceramic material with high energy storage density as well as preparation method and application thereof

Abstract

The invention relates to a bismuth niobate-based glass ceramic material with high energy storage density as well as a preparation method and application thereof. A chemical composition of the bismuthniobate-based glass ceramic material accords with a general formula of 25Bi2O3-25Nb2O5-50SiO2, and a principal crystalline phase is bismuth niobate. The preparation method of the glass ceramic material comprises a step of preparing by adopting a high-temperature melting-controlled crystallization method. Compared with the prior art, the bismuth niobate-based glass ceramic material disclosed by theinvention has high energy storage density and excellent temperature stability, and also has the advantages of the characteristics of simplicity in preparation method and low cost, high follow-up study application potential and the like.

Description

technical field

[0001] The invention relates to the field of dielectric energy storage materials, in particular to a bismuth niobate-based glass ceramic material with high energy storage density and a preparation method thereof. Background technique

[0002] In recent years, as an important part of various electronic systems, pulse counting has been widely used in electronic computers, television, communications, radar, remote control, automatic control, radio navigation and measurement technology and other fields. Pulse technology refers to short-term energy release with a power of more than 100 megawatts (MW) and a pulse width of less than 1s. The pulse power device can be simplified to store low-power electric energy in an energy storage device, such as a capacitor, etc. When the stored energy reaches a specified value, it is converted through a charge-discharge circuit to convert the stored energy in a very short time Release quickly to achieve the purpose of high curre...

Examples

preparation example Construction

[0030] The preparation method of the above-mentioned bismuth niobate-based glass-ceramic material with high energy storage density comprises the following steps:

[0031] (1) with Bi 2 o 3 , Nb 2 o 5 and SiO 2 As raw material, according to 25Bi 2 o 3 -25Nb 2 o 5 -50SiO 2 The molar chemical ratio ingredients, after rolling and mixing evenly, high-temperature melting, to obtain high-temperature glass melt;

[0032] (2) Pour the high-temperature glass melt prepared in step (1) into a preheated copper mold to form and maintain the preheating temperature to remove the residual stress in the glass, and prepare amorphous glass with uniform composition. After slicing get glass flakes;

[0033] (3) Performing controlled crystallization on the glass flakes prepared in step (2) to obtain the bismuth niobate-based glass-ceramic material with high energy storage density.

[0034] The preferred process condition for step (1) high-temperature melting is: heat preservation at 1500-...

Embodiment 1

[0039] A method for preparing a bismuth niobate-based glass-ceramic energy storage material with high energy storage density, comprising the following steps:

[0040] (1) Bi with a purity greater than 99wt% 2 o 3 , Nb 2 o 5 , SiO 2 For raw material batching, the mole percentage of each component is 25%, 25%, 50%, mixed by ball mill for 24h, dried at 120°C for 6 hours, then melted at 1550°C for 2h; Ethanol is used as the medium, and the ball-to-material ratio is 1.5:1).

[0041] (2) Pouring the high-temperature melt obtained in step (1) into a square copper mold, annealing for stress relief at 600° C. for 6 hours, and then cutting to obtain glass flakes with a thickness of 1.0 to 1.5 mm;

[0042] (3) Put an equal amount of the glass flakes prepared in step (2) into a square crucible, heat up to 700°C at a rate of 3°C / min, and keep warm for 6 hours to obtain glass ceramics.

[0043] The energy storage density of the sample prepared in this embodiment is as follows: figure...

Embodiment 2

[0045] A method for preparing a bismuth niobate-based glass-ceramic energy storage material with high energy storage density, comprising the following steps

[0046] (1) Bi with a purity greater than 99wt% 2 o 3 , Nb 2 o 5 , SiO 2 For raw material batching, the mole percentage of each component is 25%, 25%, 50%, mixed by ball mill for 24h, dried at 120°C for 6 hours, then melted at 1550°C for 2h; Ethanol is used as the medium, and the ball-to-material ratio is 1.5:1).

[0047] (2) Pouring the high-temperature melt obtained in step (1) into a square copper mold, annealing for stress relief at 600° C. for 6 hours, and then cutting to obtain glass flakes with a thickness of 1.0 to 1.5 mm;

[0048] (3) Put an equal amount of the glass flakes prepared in step (2) into a square crucible, heat up to 750°C at a rate of 3°C / min, and keep warm for 6 hours to obtain glass ceramics.

[0049] The energy storage density of the sample prepared in this embodiment is as follows: figure ...

technical field

[0001] The invention relates to the field of dielectric energy storage materials, in particular to a bismuth niobate-based glass ceramic material with high energy storage density and a preparation method thereof. Background technique

[0002] In recent years, as an important part of various electronic systems, pulse counting has been widely used in electronic computers, television, communications, radar, remote control, automatic control, radio navigation and measurement technology and other fields. Pulse technology refers to short-term energy release with a power of more than 100 megawatts (MW) and a pulse width of less than 1s. The pulse power device can be simplified to store low-power electric energy in an energy storage device, such as a capacitor, etc. When the stored energy reaches a specified value, it is converted through a charge-discharge circuit to convert the stored energy in a very short time Release quickly to achieve the purpose of high curre...

Examples

preparation example Construction

[0030] The preparation method of the above-mentioned bismuth niobate-based glass-ceramic material with high energy storage density comprises the following steps:

[0031] (1) with Bi 2 o 3 , Nb 2 o 5 and SiO 2 As raw material, according to 25Bi 2 o 3 -25Nb 2 o 5 -50SiO 2 The molar chemical ratio ingredients, after rolling and mixing evenly, high-temperature melting, to obtain high-temperature glass melt;

[0032] (2) Pour the high-temperature glass melt prepared in step (1) into a preheated copper mold to form and maintain the preheating temperature to remove the residual stress in the glass, and prepare amorphous glass with uniform composition. After slicing get glass flakes;

[0033] (3) Performing controlled crystallization on the glass flakes prepared in step (2) to obtain the bismuth niobate-based glass-ceramic material with high energy storage density.

[0034] The preferred process condition for step (1) high-temperature melting is: heat preservation at 1500-...

Embodiment 1

[0039] A method for preparing a bismuth niobate-based glass-ceramic energy storage material with high energy storage density, comprising the following steps:

[0040] (1) Bi with a purity greater than 99wt% 2 o 3 , Nb 2 o 5 , SiO 2 For raw material batching, the mole percentage of each component is 25%, 25%, 50%, mixed by ball mill for 24h, dried at 120°C for 6 hours, then melted at 1550°C for 2h; Ethanol is used as the medium, and the ball-to-material ratio is 1.5:1).

[0041] (2) Pouring the high-temperature melt obtained in step (1) into a square copper mold, annealing for stress relief at 600° C. for 6 hours, and then cutting to obtain glass flakes with a thickness of 1.0 to 1.5 mm;

[0042] (3) Put an equal amount of the glass flakes prepared in step (2) into a square crucible, heat up to 700°C at a rate of 3°C / min, and keep warm for 6 hours to obtain glass ceramics.

[0043] The energy storage density of the sample prepared in this embodiment is as follows: figure...

Embodiment 2

[0045] A method for preparing a bismuth niobate-based glass-ceramic energy storage material with high energy storage density, comprising the following steps

[0046] (1) Bi with a purity greater than 99wt% 2 o 3 , Nb 2 o 5 , SiO 2 For raw material batching, the mole percentage of each component is 25%, 25%, 50%, mixed by ball mill for 24h, dried at 120°C for 6 hours, then melted at 1550°C for 2h; Ethanol is used as the medium, and the ball-to-material ratio is 1.5:1).

[0047] (2) Pouring the high-temperature melt obtained in step (1) into a square copper mold, annealing for stress relief at 600° C. for 6 hours, and then cutting to obtain glass flakes with a thickness of 1.0 to 1.5 mm;

[0048] (3) Put an equal amount of the glass flakes prepared in step (2) into a square crucible, heat up to 750°C at a rate of 3°C / min, and keep warm for 6 hours to obtain glass ceramics.

[0049] The energy storage density of the sample prepared in this embodiment is as follows: figure ...

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