In this study , the kindling temperature of pure magnesium covered with the boronised substance and mg - al alloys , using the kindling temperature measuring method designed in this study , and exploring the boronised substance and aluminium ’ s influencings on the pure magnesium ’ s kindling temperature 应用本研究中所设计的燃点测试方法，对材料表面浸涂有硼化物的纯镁试样和镁-铝合金试样的燃点进行了测试，并通过大量试验，探讨了硼和铝对镁燃点的影响特点。
According to the literature in the world , now the research of lab6 is not mostly concentrated in field emission but hot emission . preparation of lab6 field emitting cold cathode is correlative with it ’ s physical and chemical characteristic . now , there are little literature that can be used for reference 人们已经对六硼化镧材料的性能做了大量研究工作,但据目前所见到的国内外文献所知,对六硼化镧阴极的研究多集中在它的热发射方面,对于以此种材料场发射冷阴极方面的研究较少。
It has weak - link free grain boundaries and is a kind of low cost material , . which could be used under 20k ~ 30k . however , mgb2 reveals a poor jc property in high magnetic field . currently in the research of the mgb2 wires and tapes many efforts have been made to improve its grain connection or enhance the jc dependence on the magnetic field using the method of chemical doping 二硼化镁是迄今为止所发现的超导临界转变温度最高的非铜氧化物超导材料,它具有无弱连接、成本低廉、能够在20k 30k应用等优势,但是mgb2在外场下的临界电流特性较差,目前在优化粉末套管法制备mgb2线带材工艺的研究中,通过改善晶间连接和利用化学掺杂提高样品的超导临界电流密度是mgb2成材研究的一个重要方向。
A large number of attempt and painstaking experiment have been done in this paper according to existing project . we also do lots of chemical and electrochemical etching research in material of lab6 , and find out three kind of methods to produce the field emitting cold cathode including reactive ion etching ( rie ) with oxygen , wet process etching and electrochemical etching . through produce some field emitting cold cathode single tip including lab6 field emitting cold cathode , molybdenum field emitting cold cathode , tungsten field emitting cold cathode , tungsten rhenium field emitting cold cathode , molybdenum covered with lab6 film field emitting cold cathode 而且,目前可借鉴的参考文献较少,围绕着前人做过的方案,本文做了大量工作,在已有文献介绍的基础上,结合原有的理论和实践基础,摸索出了包括高温氧作用反应离子( rie )刻蚀法、湿法腐蚀法和电化学腐蚀法在内的三种制备工艺,运用电化学腐蚀工艺成功制备了单尖的六硼化镧场发射冷阴极尖锥、钼场发射冷阴极尖锥、钨场发射冷阴极尖锥、钨铼合金场发射冷阴极尖锥以及有六硼化镧薄膜覆盖的钼场发射冷阴极尖锥。
