Al2O3 -WC合成的高能球磨反应-圣保罗大学(巴西)
2015-03-11 09:50
浏览:122次
分享:
资料摘要:
Like most carbide-based composites, the two main characteristics of alumina–tungsten carbide (Al2O3–WC) composites are high hardness
and high wear resistance. These features confer the composites important engineering applications, in particular when they are used as cutting
tools. The present research involved a study of Al2O3–WC nanometric powders obtained through reactive milling. In this process, high-energy
milling promotes the reaction in a mixture of reactive powders. The material was milled in a high-energy SPEX 8000 Mixer/Mill, using WO3,Al
and C precursor powders. The highly exothermic self-propagating high-temperature synthesis (SHS) type reaction was self-sustained, producing
a temperature peak that was detected by a thermocouple attached to the external surface of the vessel. Using stoichiometric proportions of the
reagents to reduce theWO3 and to obtainWC, and adding Al2O3 as diluent, the SHS reaction occurred up to a limit of 0.8mols of diluent, forming
not only alumina but also aW2C mixture with littleWC. To obtain onlyWC it was required the addition of more than 0.8mols of C, which indicates
that the reaction may have occurred through a gaseous phase reaction mechanism.
下载本篇资料:
l23合成的高能球磨反应圣保罗大学巴西.pdf
417KB
相关资料
锂离子电池(LIBs)是便携式电子设备和电动工具的能量存储设备,并具有作为替代燃料车辆能源的巨大潜力。SPEX Mixer/Mill是一种高能球磨机,最近在关键研究中用于消除制造过程中对环境有影响的物质。要了解更多关于这项研究的信息,请访问链接https://bit.ly/2Tqe7kH
液相色谱-串联质谱法分析水、固体、生物固体和组织样品中的全氟烷基和多氟烷基物质(PFAS)——美国环境保护署水办公室
当需要纯化手性化合物时,ACCQPrep HP150可以配备手性柱,可以很容易地进行这种类型的纯化。由于反式二苯乙烯氧化物是手性纯化的标准物,因此它被用作其他手性化合物的模型。
蒸气压和密度是原油、汽油及其中间体最重要的质量参数之一。根据GB/T 11059,ASTM D6377(原油蒸气压),SH/T 0794,ASTM D5191(汽油蒸气压) 和SH/T 0604,ASTM D4052(密度)的测试标准,可在炼油厂的质检室以及整个分配链,如在终端、存储设施,甚至直接在使用移动实验室进行测试。