The glass-ceramic dielectrics and internal electrode structures are investigated for improving the general energy storage density of capacitors. Calculation indicates that glass-ceramics acquired from glass matrix ann...The glass-ceramic dielectrics and internal electrode structures are investigated for improving the general energy storage density of capacitors. Calculation indicates that glass-ceramics acquired from glass matrix annealing at 850℃ for 3 hours can be approximately up to 17 J/cm3 in energy storage density. They are appropriately chosen as the dielectrics for preparing high energy storage density capacitors (HESDCs). A series multilayer structure of internal electrode is developed for the HESDCs, in which each layer is a combination of gold film and silver paste. This electrode structure promises the capacitor immune from the residual porosity defects inevitably brought by electrode paste sintering process, and specifically improves the electrical breakdown strength of the capacitor. Based on this new electrode structure, the energy storage densities of capacitors are increased by more than one order of magnitude compared with those traditional ones with only single layer of internal electrode. Thus, HESDCs based on the optimized glass-ceramic dielectrics can potentially achieve 7.5 J/cm3 in energy storage density, even taking into consideration the enlargement of total capacitor volumes while encapsulating practicable capacitors from dielectrics media.展开更多
在3.5wt%NaCl溶液中,采用极化曲线研究了AZ31、AZ61和AZ91电化学腐蚀性能。结果表明,随Al含量的增加,腐蚀电位先正移后负移,腐蚀电流密度先减小后增大。利用组装空气电池方法测试三者在电流密度为10 m A·cm^(-2)时的放电性能。AZ6...在3.5wt%NaCl溶液中,采用极化曲线研究了AZ31、AZ61和AZ91电化学腐蚀性能。结果表明,随Al含量的增加,腐蚀电位先正移后负移,腐蚀电流密度先减小后增大。利用组装空气电池方法测试三者在电流密度为10 m A·cm^(-2)时的放电性能。AZ61具有最稳定的放电曲线,最小的电压滞后问题,阳极效率高达50.26%。AZ61中含有不连续短粗条状和大颗粒状的β相,放电物质脱落较少。AZ61被认为是AZ系合金中最适合用作空气电池负极的材料。展开更多
岩石压裂技术可以有效改善油气渗透性和导流能力,提高油气产量。为此,研究了高压大电流脉冲放电对岩石的压裂效应,研制了一套高能电弧压裂装置,并在无围压情况下进行了岩样压裂造缝实验。此装置主要由高频高压充电电源、储能单元、放电...岩石压裂技术可以有效改善油气渗透性和导流能力,提高油气产量。为此,研究了高压大电流脉冲放电对岩石的压裂效应,研制了一套高能电弧压裂装置,并在无围压情况下进行了岩样压裂造缝实验。此装置主要由高频高压充电电源、储能单元、放电开关、放电电极和安全泄放装置组成,其最高工作电压为20 k V,最大储能为40 k J。在无围压条件下,对10块人造水泥砂岩进行了低能量和高能量压裂实验。实验结果表明,单次脉冲放电电压越高、单次储能越大、放电次数越多、岩样质地密度越小,高能电弧压裂效果越好。展开更多
文摘The glass-ceramic dielectrics and internal electrode structures are investigated for improving the general energy storage density of capacitors. Calculation indicates that glass-ceramics acquired from glass matrix annealing at 850℃ for 3 hours can be approximately up to 17 J/cm3 in energy storage density. They are appropriately chosen as the dielectrics for preparing high energy storage density capacitors (HESDCs). A series multilayer structure of internal electrode is developed for the HESDCs, in which each layer is a combination of gold film and silver paste. This electrode structure promises the capacitor immune from the residual porosity defects inevitably brought by electrode paste sintering process, and specifically improves the electrical breakdown strength of the capacitor. Based on this new electrode structure, the energy storage densities of capacitors are increased by more than one order of magnitude compared with those traditional ones with only single layer of internal electrode. Thus, HESDCs based on the optimized glass-ceramic dielectrics can potentially achieve 7.5 J/cm3 in energy storage density, even taking into consideration the enlargement of total capacitor volumes while encapsulating practicable capacitors from dielectrics media.
文摘在3.5wt%NaCl溶液中,采用极化曲线研究了AZ31、AZ61和AZ91电化学腐蚀性能。结果表明,随Al含量的增加,腐蚀电位先正移后负移,腐蚀电流密度先减小后增大。利用组装空气电池方法测试三者在电流密度为10 m A·cm^(-2)时的放电性能。AZ61具有最稳定的放电曲线,最小的电压滞后问题,阳极效率高达50.26%。AZ61中含有不连续短粗条状和大颗粒状的β相,放电物质脱落较少。AZ61被认为是AZ系合金中最适合用作空气电池负极的材料。
文摘岩石压裂技术可以有效改善油气渗透性和导流能力,提高油气产量。为此,研究了高压大电流脉冲放电对岩石的压裂效应,研制了一套高能电弧压裂装置,并在无围压情况下进行了岩样压裂造缝实验。此装置主要由高频高压充电电源、储能单元、放电开关、放电电极和安全泄放装置组成,其最高工作电压为20 k V,最大储能为40 k J。在无围压条件下,对10块人造水泥砂岩进行了低能量和高能量压裂实验。实验结果表明,单次脉冲放电电压越高、单次储能越大、放电次数越多、岩样质地密度越小,高能电弧压裂效果越好。
