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Cu-ZrW_2O_8复合镀层的制备 被引量:4
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作者 谭澄宇 郑学斌 +2 位作者 赵旭山 刘宇 李劲风 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2008年第2期234-238,共5页
以ZrO2和WO3为原料,通过两步烧结法制备具有负热膨胀性的钨酸锆(ZrW2O8)粉体,利用X射线衍射(XRD)对合成粉体进行分析。在含ZrW2O8粉体的酸性镀铜溶液中进行复合电镀,就电流密度、电镀时间以及添加剂对复合镀层中ZrW2O8粉体含量的影响进... 以ZrO2和WO3为原料,通过两步烧结法制备具有负热膨胀性的钨酸锆(ZrW2O8)粉体,利用X射线衍射(XRD)对合成粉体进行分析。在含ZrW2O8粉体的酸性镀铜溶液中进行复合电镀,就电流密度、电镀时间以及添加剂对复合镀层中ZrW2O8粉体含量的影响进行分析,并利用扫描电镜(SEM)对不同条件下镀层表面的微观形貌进行观察与分析。实验结果表明:电流密度控制在2A/dm2时,镀层中能获得较高的粉体含量;随着电镀时间延长,粉体在镀层中含量呈峰值变化;镀液中添加十六烷基三甲基溴化氨(CTAB)或十二烷基硫酸钠(SDS)并不利于复合镀层中ZrW2O8粉体含量的提高。 展开更多
关键词 cu-zrw2o8复合镀层 负热膨胀 电镀 粉体
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高热导率低热膨胀系数Cu-ZrW_2O_8复合材料的制备与性能 被引量:5
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作者 彭卓玮 李劲风 郑子樵 《粉末冶金材料科学与工程》 EI 2009年第5期337-342,共6页
以负热膨胀材料ZrW2O8与金属Cu为原料,分别采用常规烧结法和热压法制备具有高热导率低膨胀系数的新型Cu基复合材料Cu-ZrW2O8,研究ZrW2O8体积分数与烧结方法对该复合材料致密度、热导率及热膨胀系数的影响。结果表明:热压法制备的Cu-50%Z... 以负热膨胀材料ZrW2O8与金属Cu为原料,分别采用常规烧结法和热压法制备具有高热导率低膨胀系数的新型Cu基复合材料Cu-ZrW2O8,研究ZrW2O8体积分数与烧结方法对该复合材料致密度、热导率及热膨胀系数的影响。结果表明:热压法制备的Cu-50%ZrW2O8复合材料的热导率达173.3W/(m·K),致密度为91.6%,均明显高于常规烧结样品;热压样品的热膨胀系数为11.2×10-6K-1,稍高于常规烧结样品;在150~300℃温度范围内热处理后该样品的平均热膨胀系数降低到10.87×10-6K-1,较纯Cu的平均热膨胀系数17×10-6K-1低很多,有望成为一种新型的电子封装材料。 展开更多
关键词 负热膨胀 cu-zrw2o8复合材料 热压 热导率 热膨胀系数
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Preparation of Negative Thermal Expansion ZrW_2O_8 Powders and Its Application in Polyimide/ZrW_2O_8 Composites 被引量:6
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作者 Juan Yang Vongsen Yang Qinqin Liu Cuifang Xu Xiaonong Cheng 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2010年第7期665-668,共4页
Negative thermal expansion (NTE) ZrW2O8 powders were prepared by step-by-step solid-state reaction with ZrO2 and WO3 powders. The coefficient of thermal expansion (CTE) of the as-prepared ZrW208 was around -5.08&#... Negative thermal expansion (NTE) ZrW2O8 powders were prepared by step-by-step solid-state reaction with ZrO2 and WO3 powders. The coefficient of thermal expansion (CTE) of the as-prepared ZrW208 was around -5.08×10^-6 K^-1 at 20-700℃. Different amounts of ZrW208 powders were added in BTDA-ODA polyamic acid to form polyimide/ZrW2O8 composites (PI/ZrW2O8). With the increment of ZrW2O8, experimental results show that ZrW2O8 powders can significantly enhance the thermal stability of the composites, and reduce the thermal expansion. A 50 wt pct ZrW2O8 addition can give rise to a 31% reduction of CTE. It is suggested that the PI/ZrW2O8 composites have potential applications in high performance microelectronic devices. 展开更多
关键词 Negative thermal expansion ZRW2o8 PoLYIMIDE composite Coefficient of thermal expansion
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Freestanding reduced graphene oxide/sodium vanadate composite films for flexible aqueous zinc-ion batteries 被引量:5
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作者 Fang Wan Xinyu Wang +2 位作者 Songshan Bi Zhiqiang Niu Jun Chen 《Science China Chemistry》 SCIE EI CAS CSCD 2019年第5期609-615,共7页
With the booming development of portable and wearable electronic devices, flexible energy storage devices have attracted great attention. Among various energy storage devices, aqueous zinc ion batteries(ZIBs) are one ... With the booming development of portable and wearable electronic devices, flexible energy storage devices have attracted great attention. Among various energy storage devices, aqueous zinc ion batteries(ZIBs) are one of the promising candidates due to their low cost, good safety, high energy and power densities. However, the conventional cathodes of aqueous ZIBs were often prepared by mixing active materials with binders and conductive additives and then coating them onto current collectors. The resultant cathodes often suffer from unsatisfied flexibility. Herein, we fabricated freestanding reduced graphene oxide/NaV_3O_8·1.5H_2O(RGO/NVO) composite films with interlinked multilayered architecture by a vacuum filtrating process. Such composite films exhibit excellent mechanical property and high electronic conductivity. Owing to unique architecture, they display a high capacity of 410 mA h g^(-1) and excellent cycling performance up to 2000 cycles with a high capacity retention of 94%. Moreover, RGO/NVO composite films can directly serve as the cathodes of flexible aqueous ZIBs. As a proof of concept,flexible ZIBs were assembled based on the composite films. Impressively, they exhibit stable performance at different bending states, demonstrating great potential application in flexible energy storage devices. 展开更多
关键词 zinc-ion battery graphene NaV3o8·1.5H2o composite film FLEXIBILITY
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