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Zhihang Peng,Dongxu Yan,Qiang Chen,Deqiong Xin,Dan Liu,Dingquan Xiao,Jian-guo Zhu 한국물리학회 2014 Current Applied Physics Vol.14 No.12
Aurivillius phase Bi3Ti1xTaxNb1xWxO12 high temperature piezoceramics were prepared by a conventional solid state reaction method. The crystal structure, dielectric, electrical conduction and piezoelectric properties were systematically studied. Pure or modified Bi3TiNbO9 ceramics revealed the presence of only two-layered Aurivillius phase, indicating that Ta/W doping entered into the B-site of pseudo-perovskite structure and formed solid solutions. The Curie temperature had a strong reliance on the structural distortion. Furthermore, Ta/W dopants act as a donor doping, decrease the number of oxygen vacancies and facilitate the domain wall motion. As a result, Ta/W modifications significantly increase the DC resistivity and piezoelectric properties. Bi3Ti0.98Ta0.02Nb0.98W0.02O12 ceramics possess the optimum d33 value (~12.5 pC/N) together with a high TC point (~893 C). Moreover, the resonance eantiresonance spectra demonstrate that the Ta/W-BTN ceramics are indeed piezoelectric in nature at 600 C. The d33 value of BTTNW-2 ceramic remains ~12.2 pC/N after annealing at 700 C. These factors suggest that the BTTNW-based ceramic is a promising candidate for ultra-high temperature sensor applications.
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Damage-control technology of oil-based drilling fluid for Kuqa piedmont structure
Peng Xu,Zhengwu Tao,Xiao Liu,Zhihang Yan,Mingbiao Xu 한국자원공학회 2018 Geosystem engineering Vol.21 No.1
Oil-based drilling fluid is widely used in tight sandstone well and shale well in recent years, performance advantages of borehole stability and formation protection are the main reason to promote its use. According to the development and existing research, oil-based drilling fluid still existed serious damage, and could not catch the attention of developers. The study chose Keshen Block as the research object, analyzed reservoir characteristics, evaluated rock wettability, damage of oil-based drilling fluid and oil trapping, and analyzed damage mechanisms of oil-based drilling fluid. Based on the damage mechanisms and the characteristics of drilling fluid, the study analyzed the damage-control mechanisms, established optimization principle of oil-based drilling fluid, and optimized drilling fluid. Dynamic damage experiments and field application of drilling fluid showed that formation protection performance of optimized oil-based drilling fluid had improved significantly, and the formation damage caused by oil-based drilling fluid had been controlled effectively.
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