Niobate glass ceramic with alkali metal oxide substitute, low dielectric loss and high energy storage density as well as preparation method and application thereof

An alkali metal oxide, high energy storage density technology, applied in glass manufacturing equipment, glass molding, manufacturing tools, etc., can solve the problem of low utilization of raw materials, complex raw materials, and little research on potassium sodium niobate glass ceramic materials, etc. problem, to achieve the effect of simplifying the glass formula, uniform grain size and good compactness
CN112225460AActive Publication Date: 2021-01-15SHAANXI UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHAANXI UNIV OF SCI & TECH
Publication Date
2021-01-15

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Abstract

The invention relates to a glass ceramic material which substitutes K2ONb2O5SiO2 with alkali metal oxide Na2O and has low dielectric loss and high energy storage density. A preparation method of the material comprises the following steps: firstly, taking K2CO3, Na2CO3, Nb2O5 and SiO2 as raw materials according to a chemical formula of 40[(1-x)K2O-xNa2O]-40Nb2O5-20SiO2 (the x is less than or equalto 0.500), uniformly mixing the powder through mechanical ball milling, and performing annealing; and performing melting, cooling molding and annealing to obtain a glass block, and performing heat preservation at 800 DEG C for 2 h, and performing crystallization treatment to obtain the glass ceramic material. The method is simple in preparation process, the raw materials are low in price, the manufacturing cost is low, a linear hysteresis loop can be obtained at the room temperature, the energy storage density reaches 2.44 J / cm<3> to the maximum, the dielectric loss is lower than 0.02, and theenergy storage efficiency is guaranteed to be 94% or above at the high temperature of 200 DEG C.
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Description

technical field

[0001] The invention relates to the field of glass ceramic materials and a preparation method thereof, in particular to an alkali metal oxide Na 2 O replaces K 2 O-Nb 2 o 5 -SiO 2 A glass-ceramic material with low dielectric loss and high energy storage density, its preparation method and application. Background technique

[0002] In recent years, the rapid development of pulse technology in the fields of hybrid electric vehicles, aerospace and oil drilling has put forward the requirements of "high temperature, high energy density and high reliability" for energy storage dielectric capacitors. Glass-ceramics composed of crystal phase and dense glass phase are favored by researchers in the field of energy storage dielectric materials due to the high breakdown field strength of the internal dense glass phase and the good dielectric properties of the ferroelectric crystal phase.

[0003] According to the calculation formula of energy storage density of line...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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