An electrochemical method for the preparation of Mg–Li alloys at low temperature molten salt system

Mg–Li alloys have been prepared by electrolysis in a molten salt electrolyte of 50% LiCl–50% KCl (mass%) at low temperature of 420–510 °C. The effects of electrolytic temperature and cathodic current density on alloy formation rate and current efficiency were studied. For the deposition of metallic lithium on the cathode consisting of solid Mg and liquid Mg–Li, both electrolytic temperature and cathodic current density have no obvious influence on current efficiency; while for the deposition of metallic lithium on the solid magnesium cathode, both electrolytic temperature and cathodic current density greatly affect alloy formation rate and current efficiency. The optimum electrolysis condition is—molten salt mixture, LiCl:KCl = 1:1 (mass%), electrolytic temperature: 480 °C, cathode current density: 1.13 A cm⁻². Mg–Li alloys with low lithium content (about 25 wt% Li) were prepared via electrolysis at low temperature following by thermal treatment at higher temperature.     

Ga2O3薄膜材料氧敏性能的研究

实验以三氯化镓为原料,柠檬酸为络合剂,通过NH3·H2O调节pH值,得到透明稳定的前躯体溶胶,红外光谱分析表明上述溶胶在向凝胶转变过程中,发生镓与柠檬酸的络合,并在干燥过程中依靠氢键形成大分子聚合物.采用提拉涂覆溶胶-凝胶法在多晶氧化铝基片表面形成凝胶膜后,经800℃下热处理,凝胶膜转化为单斜相β-氧化镓陶瓷薄膜.重复镀膜和热处理及超声清洗过程8个～10个周期,最后在800℃下烧结,保温1h,得到粒径为50nm～100nm左右的多孔纳米薄膜.采用自制系统检测β-Ga2O3薄膜的氧敏性能,结果表明Fe掺杂的氧化镓薄膜材料,在400℃～800℃范围内,在理论空燃比附近,电阻突变幅度大于2个数量级,具有较高的灵敏度.     

5Cr21Mn9Ni4WNb2N奥氏体耐热钢晶界碳化物

5Cr21Mn_9Ni_4WNb_2N耐热钢锻造后在1200℃以上加热时，NbC聚集成大块，在1200℃以下加热时，NbC薄膜（片）的析出倾向随加热温度降低而增大，1130℃及其以下加热时，粒状和细片状M_(23)C_6随加热温度降低而增多，而且NbC块可作为碳源退化成M_(23)C_6颗粒，过高或过低温度的锻造加热，因晶界NbC块过大或晶界NbC薄膜（片）过多而不利于锻造加工。     

CRYSTALLINE STRUCTURE AND TWIN OF Cr_7 C_3 IN SUPERALLOYS

从单晶电子衍射斑点确认了高温合金中的Cr_7C_3相是正交晶体结构。从电子衍射花样上发现了Cr_7C_3相中存在{013}生长孪晶,并可能存在着二次孪晶。在Cr_7C_3薄膜中观察到了{013}孪晶。研究了Cr_7C_3相高次孪晶的相互关系。     

压铸模与铝合金金属间化合物的形成与分解

为了研究压铸模与铝合金金属间化合物的形成与分解过程,进行了热浸铝试验.试验结果表明金属间化合物的形成与分解是一个连续不断的循环过程,两者之间的相互关系导致了钢基的失重以及体积的减少.     

弧焊机器人焊接系统的研制与应用

本文介绍弧焊机器人焊接系统的研制及应用。该系统与示教再现型机器人配套,适于CO_2焊接。它采用高性能晶闸管式弧焊电源和推拉丝式送丝机,通过接口盒与机器人控制器通讯,能检测多种故障和报警。经反复试验和生产现场使用,证明该系统性能优良,工作可靠,焊接质量高,成本低,可实现国产化,替代进口产品。     

CdZnTe Crystal Growth by Vertical Gradient Freezing Method

ＣｄＺｎＴｅＣｒｙｓｔａｌＧｒｏｗｔｈｂｙＶｅｒｔｉｃａｌＧｒａｄｉｅｎｔＦｒｅｅｚｉｎｇＭｅｔｈｏｄＨｏｕＱｉｎｇｒｕｎ；ＷａｎｇＪｉｎｙｉ；ＤｅｎｇＪｉｎｃｈｅｎｇ；ＤｕＢｉｎｇ，（侯清润）（王金义）（邓金诚）（杜冰）；ＬｉＭｅｉｒｏｎｇａｎｄＣ...     

釉上金红颜料的研制

采用液相反应法研制了釉上金红颜料，给出了颜料和熔剂配方及其制备方法。     

正负离子表面活性剂相互作用的理论和实验研究

Typical cationic and anionic surfactants were chosen and their interactions were calculated by quantumchemical method. Interaction energies are -0.2378kJ·mol~(-1),-3.3394kJ·mol~(-1) and 0.1204kJ·mol~(-1) for the molec-ular pairs with fluocarbon and hydrocarbon chain: C_4H_(10)/C_5H_(12), C_4F_(10)/C_5H_(12), and C_4F_(10)/C_5F_(12), respectively.When hydrophilic group with cationic and anionicions is introduced, interaction energies are -287.40kJ·mol~(-1),-311.18kJ·mol~(-1) and -345.83kJ·mol~(-1). The results show that there is strong static interaction between cationicand anionic surfactants. It has been predicted that mixed monolayer may be formed and surface activity is en-hanced favorably, especially for mixtures of cationic and anionic surfactants with fluocarbon and hydrocarbonchains. The anionic surfactants, sodium octadecylbenzenesulfonate perfluopolyetherbenzenesulonate(ANF-Ⅰ)wassynthesized, mixture effects of ANF-Ⅰ with sodium octadecylbenzenesulfonate or dodecyldimethyl benzylammonium     

Ca_(0.6)Mg_(0.4)Zr_4(PO_4)_6低膨胀陶瓷的制备与烧结

采用分步沉淀法合成了Ca_(0.6)Mg_(o.4)Zr_4(PO_4)_6单相粉体。CMZP陶瓷的烧结主要取决于温度和烧结助剂,最大密度达到理论值的98％,借助SEM观察了表面及断口形貌,EDX作元素的半定量分析在1300℃试样表面发生了分解。