共查询到19条相似文献,搜索用时 171 毫秒
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Bi0.5Na0.5TiO3基无铅压电陶瓷设计与制备研究的新进展 总被引:1,自引:0,他引:1
综述了Bi0.5Na0.5TiO3(BNW)基无铅压电陶瓷体系研究的最新进展,介绍了BNT基无铅压电陶瓷的设计方法及其制备技术.用自洽场离散变分法(self-consult charge-discrete variation-Xa,SCC-DV-Xa)等计算方法可为设计新型BNT基陶瓷提供重要的理论指导.用湿化学法,包括:溶胶-凝胶法、柠檬酸盐法、水热法等,可以合成BNT基纳米粉体,该类方法制备的BNT基粉体具有良好烧结活性,利于致密化烧结,使材料电性能得到改善.用模板晶粒生长技术可获得晶粒生长定向程度很高的BNT基压电陶瓷材料,进而提高材料在特定方向的压电性能. 相似文献
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无铅压电陶瓷的开发与应用是当今压电陶瓷发展的必然趋势,本文综合分析了无铅压电陶瓷的研究背景,给出了钙钛矿型无铅压电陶瓷的主要体系,包括钛酸钡基无铅压电陶瓷、BNT基无铅压电陶瓷,分析比较了其性能及研究现状。 相似文献
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《中国陶瓷工业》2016,(2)
以五水硝酸铋(Bi(NO_3)_3·5H_2O)和二氧化钛(TiO_2)为原料,氢氧化钠(NaOH)为矿化剂,采用水热法合成了具有钙钛矿结构的钛酸铋钠Na_(0.5)Bi_(0.5)TiO_3(BNT)无铅压电陶瓷粉体和陶瓷。利用X射线衍射仪(XRD)对产物晶体结构进行表征,用扫描电镜(SEM)观察产物粉体的表观形貌和粒径,并测试了陶瓷的电性能。结果表明,在200℃反应4h,NaOH浓度为6 mol/L,可以水热合成出单一晶相,粒径约为200nm的BNT粉体,用此粉体在1130℃烧结的陶瓷的介电常数ε_r=385.26,压电系数d_(33)=98cP/N。 相似文献
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稀土氧化物在陶瓷工业中的应用 总被引:6,自引:1,他引:6
本文论述了稀土氧化物在陶瓷坯釉料,陶瓷颜料,陶瓷金水,工业陶瓷等方面的应用研究,初步探讨了稀土氧化物的作用机理,表明了稀土氧化物在陶瓷工业中有着广泛的作用并有着广阔的应用前景。 相似文献
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稀土氧化物对钛酸铝陶瓷显微结构和力学性能的影响 总被引:8,自引:0,他引:8
研究了添加稀土氧化物Y2O3和Y2O3+Nd2O3对钛酸铝陶瓷的烧结温度、力学性能和显微结构的影响.结果表明,添加1%的稀土氧化物可以降低钛酸铝陶瓷的烧结温度,改善其显微结构,提高其力学性能,尤其是添加1%的复合稀土氧化物(Y2O3+Nd2O3)后,钛酸铝陶瓷的抗折强度和断裂韧性是未添加的试样的1.96倍和1.82倍.其性能提高的主要原因是由于稀土元素的细晶强化、净化界面、固溶强化、自增韧补强等作用. 相似文献
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《Ceramics International》2019,45(16):20121-20127
In-situ SiAlON reinforced BN-matrix ceramics were prepared by hot pressing sintering, and the effects of different rare earth oxides on the thermal shock resistance of the materials were investigated. The effects of rare earth oxides on the phase composition, microstructure, bending strength, thermal properties and thermal shock resistance of the composites were studied. The results show that the phase composition and bending strength of ceramics with different rare earth oxides had no obvious change. However, the influence on the thermal expansion coefficient of the material was notable. The thermal expansion coefficient of the ceramics with CeO2 increased by 24.6% compared with Sm2O3 in the test temperature range. After 50 cycles of thermal shock at Δt = 1150 °C, the residual strength of ceramics with CeO2 was down to 157.1 MPa, decreased by 40.6% compared with the one tested in room temperature. And the Sm2O3-added ceramics reduced by 34.7%–167.1 MPa after thermal shock. The decrease of the residual strength of ceramics is mainly caused by the internal stress generated by the mismatch between the growth of quartz and SiAlON phase in the matrix and the thermal expansion coefficient of the matrix. However, no macro cracks were observed on the surface of the samples after thermal shock. 相似文献
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《Journal of the European Ceramic Society》2014,34(12):2865-2874
Silicon carbide (SiC) ceramics have been fabricated by pressureless liquid phase sintering with Al2O3 and rare-earth oxides (Lu2O3, Er2O3 and CeO2) as sintering additives. The effect was investigated of the different types of rare earth oxides on the mechanical property, thermal conductivity and microstructure of pressureless liquid phase sintered SiC ceramics. The room temperature mechanical properties of the ceramics were affected by the type of rare earth oxides. The high temperature performances of the ceramics were influenced by the triple junction grain boundary phases. With well crystallized triple junction grain boundary phase, the SiC ceramic with Al2O3–Lu2O3 as sintering additive showed good high temperature (1300 °C) performance. With clean SiC grain boundary, the SiC ceramic with Al2O3–CeO2 as sintering additive showed good room temperature thermal conductivity. By using appropriate rare earth oxide, targeted tailoring of the demanding properties of pressureless liquid phase sintered SiC ceramics can be achieved. 相似文献
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随着人们环保意识的增强,无铅压电陶瓷的研究和开发成为当前压电材料领域研究的热点。本文采用溶胶-凝胶法制备了BNT(钛酸铋钠)粉体,采用干压成型、高温电炉烧成无铅压电陶瓷样品,并对BNT粉体及无铅压电陶瓷样品进行了性能分析与结果讨论。 相似文献