车屑螺旋状填充质HGMS处理FCC废催化剂

选用车屑螺旋状填充质高梯度磁分离对ＦＣＣ废催化剂进行了分离处理，并对分离后的催化剂进行了活性检验。试验表明：通过ＨＧＭＳ可将废催化剂分离，主要影响回收率及分离后催化剂中Ｎｉ含量的有背景场强、给矿流量、给矿量等因素。通过循环分离试验，可将不同金属含量的废催化剂分出，其活性随Ｎｉ含量降低而增加，其中活性达７７的催化剂占催化剂总量近４０％。  

Effect of Ni content on cracking susceptibility and microstructure of laser-clad FeCrNiBSi alloy

An investigation is reported of the laser surface cladding of self-fluxing Fe---Cr---Ni---B---Si alloys on a medium carbon steel substrate using the preplaced powder method. The cracking susceptibility and microstructure of the laser-cladding layer have been studied in terms of its Ni content, thermal expansion coefficient and wettability on the substrate. With increasing Ni content the cracking susceptibility of the cladding layer decreases and its microstructure changes from a “bamboo leaf” structure to a typical dendritic one.  

Ni 含量对SHS 法合成TiC-Ni 基金属陶瓷的影响

利用SHS 结合准热等静压(PH IP) 技术制备了TiC-Ni 基金属陶瓷, 理论分析和实验显示, 绝热温度T_ad和燃烧温度T c 随Ni 含量的增加而降低, 反应温度影响产物的组织形貌,Ni 含量的增加使合成的TiC 颗粒尺寸变小, 并且逐渐趋向于规则的球形。最后的产物均由TiC 和Ni 两相组成。产物的致密度随Ni 含量的增加逐渐提高, 硬度值随Ni 含量的变化而变化, 两种因素的作用使硬度值在Ni 含量为20% 时达到最大。  

Effects of temperature and Nickel content on magnetic properties of Ni-doped ZnO

Magnetic properties of diluted magnetic semiconductors (DMSs), Ni-doped ZnO materials, prepared by sol-gel method were investigated by measuring magnetization as functions of magnetic field.The Ni content affects the magnetic properties at low sintered temperature but it has few effects on the magnetic properties at high sintered temperature.The sintered temperature has great effects on the magnetic properties of Ni/ZnO at high original mole ratio of Ni/Zn while it has slight effects on the magnetic properties of Ni/ZnO at low original mole ratio of Ni/Zn whatever low or high sintered temperature.  

镍含量对13Cr型低碳马氏体不锈钢性能的影响

镍是影响１３Ｃｒ型低碳马氏体不锈钢性能的主要元素之一。本文研究了１３Ｃｒ型不同镍含量的低碳马氏体不锈钢的力学性能，电磁性能，组织状态以及电化学条件下腐蚀电位变化等。研究确定：低碳马氏体不锈钢中镍含量在．５％－６．０％时，可获得良好的强韧性。作为软磁不锈钢使用，其镍含量控制在３．５％－４．５％区间内，可获得满意的综合力学性能和良好的电磁性能。  

激光焊接参数对TiNi合金相变温度的影响

采用Nd:YAG激光和光纤激光焊接了Ti-50.7%Ni(原子分数)记忆合金,利用DSC,SEM和EDS对焊缝金属相变温度的变化规律和影响因素进行了分析,并对焊接接头的记忆功能进行了研究.结果表明,不同焊接工艺参数的焊缝金属与母材相比,相变温度有明显差异,产生差异的主要原因是组织的不同和基体Ni含量的差别.基体Ni含量与C,O,N的含量、富Ni沉淀相尺寸和数量以及焊接过程中Ni的烧损有关.低热输入、高激光功率密度的焊缝金属,基体Ni含量高,相变温度偏离母材的程度更大.焊缝金属相变温度的变化使得焊接接头形状恢复温度区间明显不同于母材,对其使用性能产生不利影响.  

Effect of Ni content on the tensile properties and strain-induced martensite transformation for 304 stainless steel

The effect of Ni content (8.3-12 wt.%) on the tensile properties and strain hardening behavior was studied on type 304 stainless steels (STS) used for the membrane of LNG storage tanks. The tensile test temperature was varied from 25 °C to −196 °C. At room temperature, the hardening and ductility indices (tensile strength, strain hardening exponent and elongation) increased with decreasing Ni content. For the 8.3-9.0 wt.% Ni STS, a lower yield point was observed at temperatures below −60 °C. It was due to the dynamic strain softening and/or transformation-induced plasticity (TRIP) that accompanied the rapid increase in the amount of strain-induced martensite (α′) at low strains. Neither dynamic strain softening nor TRIP was observed for the 12 wt.% Ni STS because only the ?-martensite transformation was produced at the low strains.  

用电导法测定镍合金中的镍

提出用丁二酮肟乙醇溶液滴定、电导法确定终点测定镍合金中镍的新方法。在氨性溶液中滴定，铜（Ⅱ）、锰（Ⅱ）、钴（Ⅱ）的干扰通过掩蔽或氧化的方法消除，其它金属离子对测定没有干扰。本方法不受溶液颜色和浊度的影响，试剂用量少，具有准确、快速、干扰少的特点，已用于镍合金中镍的测定，获得了精密度高、准确度好的分析结果。  

美国Leco TN－314色谱定氮仪故障检查与排除

系统地整理总结了美国色谱定氮仪在长期使用过程中出现的部分问题和故障及其检查与处理方法，有效地保证了仪器的正常运转和最大利用率。  

影响1Cr25Ni20Si2钢伸长率的因素分析

采用化学分析、金相检验和扫描电镜等手段对1Cr25Ni20Si2钢伸长率不合格的现象进行了分析。结果表明，由于大量析出铁铬镍合金相导致了此钢种的伸长率不合格；提高镍含量能有效降低铁铬镍相的析出，从而提高伸长率的合格率。