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研制了一种适合高频响应变形镜使用要求的压电陶瓷材料体系,并采用流延工艺成功制备了大尺寸厚膜(90 mm×0.30 mm),并采用粘接固化工艺制备出90 mm口径的压电厚膜驱动连续变形镜。结果表明,压电陶瓷材料配方通式为Pb1-aMa[(Zn1-bLb)1/3Nb2(1-x)/3]eZrfTigOh,e+f+g=1,M=Ca、Sr、Ba、La、K,L=Ni、Co、Fe,其机电耦合系数kp≥0.72,压电常数d33≥590 pC/N,居里温度TC≥300℃,介电损耗tanδ≤1.2%,介电常数3Tε3/0ε=2 000~2 500,烧成温度1 150℃;扣除离焦前的压电厚膜驱动连续变形镜面形约3μm,扣除离焦后的面形约0.4μm;陶瓷厚膜的烧银过程变形致使镜面粘接工艺过程气泡难以消除,产生变形镜面-陶瓷间粘接不连续。 相似文献
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偶联剂对短玻纤增强PA66微观结构及性能影响研究 总被引:13,自引:0,他引:13
利用双螺杆挤出机制备短玻纤增强尼龙66(GF/PA66)复合材料,研究多种偶联剂对GF/PA66的微观结构及性能的影响。结果表明,偶联剂的加入,不仅使GF在PA66基体中基本呈均匀分布,而且使材料的结构及性能有较大的改善;复合偶联剂All00 A B的改性效果优于单独使用A1100;复合偶联剂中All00的最佳含量为1.5%;随着GF含量的增加,材料的综合性能提高,但当GF含量大于35%时,材料的综合性能开始有所降低;All00 A B改性的GF/PA66的失效机理为界面的脱粘、脱粘后的摩擦和纤维的拔出。 相似文献
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A new preparation method (reduction-decomposition process) for high purity SrCO3 was investigated,which mainly includes four processes: reduction, leaching, purification and precipitation. The affecting factors a-bout S^2- behaviors in leaching process and the effects of variables on purity and particle sizes distribution of SrCO3 were analyzed theoretically and practically. It is concluded that with the increase of temperature or decrease of pH value in leaching process, the strontium recovery increases, but SrS decomposes and hydrogen sulphide (H2S) gas discharges. The purity of SrCO3 is dependent on dissolution-recrystallization times, for example, the purity of SrCO3 is as high as 99. 97% when it is recrystallized three times. Besides, the solution concentration of Sr(OH)2 and flow rate of CO2 have important effects on particle size distribution of SrCO3 particles, especially, the particle sizes of SrCO3 meanly distribute in 0.1-1.0μm when the flow rate of CO2 is about 2000mL/min and other param-eters are invariable. 相似文献
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研究了Sn改性(Pb0.45Ca0.55)(Fe0.5Nb0.5)O3微波介质陶瓷的微波介电性能,在此基础上以切比雪夫响应法设计制备出四腔独石型介质滤波器,并分析影响滤波器性能的因素。结果表明,添加Sn可改善(Pb0.45Ca0.55)(Fe0.5Nb0.5)O3陶瓷的介电性能,且能在1 150℃烧结出致密的陶瓷材料;当x(Sn)=0.1(摩尔分数)时,其介电常数rε=84.7,频率温度系数fτ=0.5,品质因数与频率之积Q×f=8 452 GHz。成功设计制备出中心频率1.075 GHz、插入损耗2.3 dB、驻波比为1.1的介质滤波器,该器件满足900~1200 MHz范围的通讯应用要求。 相似文献
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