W_(45)Cu_(55),Cr_(65)Cu_(35),and Cr_(32)W_(14)Cu_(54)alloys were obtained in order to study the mechanism of“smart response”of the structure of these alloys when using them as arc-resistant circuit-breakers.These al...W_(45)Cu_(55),Cr_(65)Cu_(35),and Cr_(32)W_(14)Cu_(54)alloys were obtained in order to study the mechanism of“smart response”of the structure of these alloys when using them as arc-resistant circuit-breakers.These alloys differ from industrial ones with frameless packing of Cr and W phases in the copper matrix.The alloy production method is based on the infiltration of copper melt into a mixture of non-compacted Cr and W powders under vibration exposure(80 Hz).The research results show an increase in the arc resistance of contacts when changing from“frame”packing of W to“frameless,”as well as the decisive role of Cr in the processes of self-dispersion of arc-resistant phases and passivation of W and Cu.Based on the obtained results,conclusions are drawn about the advantage of frameless packing of arc-resistant phases in copper and the reasons for the“smart behavior”of the structure of Cr-containing contacts in response to functional loads in the presence of oxygen and an inert atmosphere.展开更多
采用分散剂对钛白粉进行了物理包覆,显著提升了钛白粉在水中的分散性能。同时,分析了钛白粉的自分散机理,并从产品应用的角度对其进行了系统评价,实验发现:经过分散剂表面包覆后粉体的Zeta(ζ)电位由-61.98 m V提升至-69.17 m V,分散液...采用分散剂对钛白粉进行了物理包覆,显著提升了钛白粉在水中的分散性能。同时,分析了钛白粉的自分散机理,并从产品应用的角度对其进行了系统评价,实验发现:经过分散剂表面包覆后粉体的Zeta(ζ)电位由-61.98 m V提升至-69.17 m V,分散液吸光值由0.102提升至0.358,沉降实验清水层明显减少,说明钛白粉的自分散性和分散稳定性得到提升;另外,采用改性钛白粉制备的色浆与未改性钛白粉制备的色浆相比分散剂用量由6%降至2%,放置黏度变化小,说明改性包覆能够实现粉体的自动解絮凝能力。展开更多
With industrial grade Al（OH）3 as raw materials, the self dispersion nanosized AlOOH crystal powder were prepared by the sol-hydrothermal method. The results of XRD and TEM show that the nanosized AlOOH could automat...With industrial grade Al（OH）3 as raw materials, the self dispersion nanosized AlOOH crystal powder were prepared by the sol-hydrothermal method. The results of XRD and TEM show that the nanosized AlOOH could automatically disperse to a single-dispersing state in water without surface modification, dispersant, additive and accessional conditions （ultrasonic wave dispersing, ball-mill dispersing）. The application results of the product indicate that the nanosized AlOOH can be composed into a toughened nanocomposites without surface modification. Accordingly, the self dispersion characteristic and mechanism of hydrothermal crystallization and charging composite dispersion of nanosized AIOOH are found, and a new technique of preparing polymer/inorganic nanocomposites is proposed, which is called blending compositing new techniques of sol even dispersing at auasi-homogeneous phase.展开更多
文摘W_(45)Cu_(55),Cr_(65)Cu_(35),and Cr_(32)W_(14)Cu_(54)alloys were obtained in order to study the mechanism of“smart response”of the structure of these alloys when using them as arc-resistant circuit-breakers.These alloys differ from industrial ones with frameless packing of Cr and W phases in the copper matrix.The alloy production method is based on the infiltration of copper melt into a mixture of non-compacted Cr and W powders under vibration exposure(80 Hz).The research results show an increase in the arc resistance of contacts when changing from“frame”packing of W to“frameless,”as well as the decisive role of Cr in the processes of self-dispersion of arc-resistant phases and passivation of W and Cu.Based on the obtained results,conclusions are drawn about the advantage of frameless packing of arc-resistant phases in copper and the reasons for the“smart behavior”of the structure of Cr-containing contacts in response to functional loads in the presence of oxygen and an inert atmosphere.
文摘采用分散剂对钛白粉进行了物理包覆,显著提升了钛白粉在水中的分散性能。同时,分析了钛白粉的自分散机理,并从产品应用的角度对其进行了系统评价,实验发现:经过分散剂表面包覆后粉体的Zeta(ζ)电位由-61.98 m V提升至-69.17 m V,分散液吸光值由0.102提升至0.358,沉降实验清水层明显减少,说明钛白粉的自分散性和分散稳定性得到提升;另外,采用改性钛白粉制备的色浆与未改性钛白粉制备的色浆相比分散剂用量由6%降至2%,放置黏度变化小,说明改性包覆能够实现粉体的自动解絮凝能力。
基金Guangxi Provincial Natural Sciences Foundation, (No.0640041)Guangxi Provincial Scientific Research and Technical Develop-ment Program Project (No. 0141033)Prior Period Research Special Fund of Significant Basic Research of National Science and Technology Depart-ment (No. 2005CCA00200)
文摘With industrial grade Al（OH）3 as raw materials, the self dispersion nanosized AlOOH crystal powder were prepared by the sol-hydrothermal method. The results of XRD and TEM show that the nanosized AlOOH could automatically disperse to a single-dispersing state in water without surface modification, dispersant, additive and accessional conditions （ultrasonic wave dispersing, ball-mill dispersing）. The application results of the product indicate that the nanosized AlOOH can be composed into a toughened nanocomposites without surface modification. Accordingly, the self dispersion characteristic and mechanism of hydrothermal crystallization and charging composite dispersion of nanosized AIOOH are found, and a new technique of preparing polymer/inorganic nanocomposites is proposed, which is called blending compositing new techniques of sol even dispersing at auasi-homogeneous phase.
