Surface nitridation of titanium metal by means of a gas tunnel type plasma jet

The surface nitridation of titanium was carried out at a low pressure in nitrogen atmosphere using a gas tunnel type plasma jet. The titanium nitride (TiN) film, 10 μm thick and 2000 HV, could be formed in 10 s. The structure of the TiN film was investigated by XRD. The Vickers hardness on the surface of the film was measured. The effects of deposition conditions on the properties of TiN films (TiN thickness,Vickers hardness, etc.) were investigated, and the advantage of this deposition method was identified from those results.     

气体雾化贮氢电极合金Ml（Ni,Co,Mn,Ti）5的活化性能

研究了感应熔炼后随炉冷却和经不同处理的气体雾化贮氢电极合金Ｍｌ（Ｎｉ，Ｃｏ，Ｍｎ，Ｔｉ）５的电化学活化特性。结果表明，氢化前后合金内能的变化是影响活化性能的原因，因表面覆盖氧化膜或任何其它原因所引起的附加内能越大，或氢化时氢原子进入四面体或八面体间隙位置所引起应变能越大，活化越困难。     

GAS-LIQUID EQUILIBRIUM OF Pb-Cd-Zn SYSTEM UNDER VACUUM

ＧＡＳ－ＬＩＱＵＩＤＥＱＵＩＬＩＢＲＩＵＭＯＦＰｂ－Ｃｄ－ＺｎＳＹＳＴＥＭＵＮＤＥＲＶＡＣＵＵＭＧＡＳ－ＬＩＱＵＩＤＥＱＵＩＬＩＢＲＩＵＭＯＦＰｂ－Ｃｄ－ＺｎＳＹＳＴＥＭＵＮＤＥＲＶＡＣＵＵＭ￥Ｌｉｕ，Ｒｉｘｉｎ（ＩｎｓｔｉｔｕｔｅｏｆＣｈｅｍｉｃａ...     

陶瓷型精密铸造模具表面脱碳的解决措施

详细介绍了一种根治陶瓷型铸件表面脱碳的方法并分析其原理。浇注前通入丙烷气体占据整个型腔空间,赶走空气,使氧气压力降到极点,浇注后继续通入气体,盖上钢罩,彻底隔绝外界空气的侵入并减小罩内压力,从而达到根治陶瓷精铸钢件表面脱碳现象的目的。     

金属基复合型材气压浸渗系统进口模具研究

就金属基复合型材主要是复合丝气体浸渗水平连续制备工作室模具系统进行了讨论.实践表明,合理的模具系统可以制备出合格的金属基复合型材.     

大型储罐倒装法施工立缝气电立焊工艺

新疆油建在50 000 m3浮顶储罐倒装法施工和100 000 m3外浮项储罐倒装法施工时,由于国内通用的背面加水冷铜衬垫的立焊气电立焊焊接工艺和焊机不适用,开发了CO2半自动焊打底,气电立焊焊接一次成形的焊接工艺.通过现场运用,CO2气体保护焊打底和气电立焊组合的焊接工艺操作简单,工效高,成形好,焊接合格率在98%以上,填补了一项大型储罐倒装法施工立缝自动焊接工艺的空白.     

浅谈电解铝厂规模电解槽容量与环境保护

本文对国内现行电解铝工业污染物排放标准提出了修改意见；阐述了电解铝厂生产规模、电解槽容量、污染物生成量。以及电解烟气净化回收与环境保护之间的关系；电解槽集气效率的计算方法；提高槽集气效率的措施以及强化环境保护。加强管理等若干问题。     

高压地下储气井专用套管疲劳性能评价

根据高压地下储气井服役情况，设计了用于实施高压地下储气井专用套管行业标准SH／T6535-2002评定其疲劳性能的试验方法，对天津钢管有限责任公司生产的专用套管疲劳性能进行了评价，并对实施该标准的方法进行了讨论。     

Effect of welding speed and electrode extension on the approximate entropy of welding current in short-circuiting GMAW

Based on the phase space reconstruction of welding current in short-circuiting transfer arc welding under carbon dioxide, the approximate entropy of welding current and its standard deviation have been calculated and analyzed at different welding speeds and different electrode extensions respectively. The experimental and calculated results show that at a certain arc voltage, wire feeding rate and gas flow rate, welding speed and electrode extension have significant effects not only on the approximate entropy of welding current, but also on the stability of welding process. Further analysis proves that when the welding speed and electrode extension are in an appropriate range respectively, the welding current approximate entropy attains maximum and its standard deviation minimum. Just under such circumstances, the welding process is in the most stable state.