A silver potassium niobate ferroelectric ceramic material for high-power pulse power supply and its preparation method and application
A high-power pulsed, ferroelectric ceramic technology, applied in the fields of high energy storage density ferroelectric ceramic materials, ferroelectric ceramic components, and ferroelectric ceramic materials, can solve problems such as few reports, loss of stored energy, etc., and achieve good temperature stability. The effect of stability, low bulk density and good application prospect
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[0040] In the present invention, the preparation method of the ferroelectric ceramic element comprises the following steps: processing the sintered high-power pulse power supply silver potassium niobate ferroelectric ceramic material into required size, preparing electrodes, and then undergoing polarization treatment. Wherein, the electrode is prepared by coating the upper and lower sides of the obtained silver acid potassium ferroelectric ceramic material with silver. The parameters of the polarization treatment include: 4-6KV / mm electric field intensity. The polarization treatment time may be 5 to 30 minutes.
[0041] In an alternative embodiment, the resulting ferroelectric ceramic element has a high energy storage density at room temperature, preferably ~5.401 kJ / kg. In an optional embodiment, the obtained ferroelectric ceramic element has better temperature stability in the remanent polarization within the temperature range of 20-150°C.
[0042] In an optional embodimen...
Embodiment 1
[0045] Embodiment 1: ferroelectric ceramic material consists of: (Ag 0.935 K 0.065 )NbO 3
[0046] (1) Calculate the components Ag in the powder raw material according to the above chemical formula 2 O, K 2 CO 3 and Nb 2 o 5 The mass is prepared according to the composition ratio, mixed by wet ball milling, and mixed for 7 hours according to the mass ratio of raw materials: ball: water = 1:2.0:1.5, so that the components are mixed evenly. After drying, pass through a 40-mesh sieve, briquette in an air atmosphere, and in an oxygen atmosphere furnace, raise the temperature to 870°C at a rate of 2°C / min, and keep it warm for 3 hours to synthesize (Ag 0.935 K 0.065 )NbO 3 ceramic powder;
[0047] (2) The ceramic powder obtained in step (1) is crushed, passed through a 30-mesh sieve, and finely ground by wet ball milling for 24 hours, and the ceramic powder after fine grinding is dried, and then 7wt.% of the weight of the powder is added PVA binder, granulated, aged for ...
Embodiment 2
[0053] Embodiment 2: ferroelectric ceramic material consists of: (Ag 0.94 K 0.06 )NbO 3
[0054] Repeat the preparation method of embodiment 1 by above-mentioned formula, Figure 4 Some electrical performance results of Example 2 are shown.
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