铝合金液直流电除氢除钠的试验研究

本文研究了铝合金熔体中Ｈ＋和Ｎａ＋的直流电效应，分析了温度、处理时间、电流密度对氢、钠去除效果的影响，提出了用直流电去除铝合金液中氢、钠的新工艺，并对其除氢除钠原理进行了理论探讨。     

铝熔体中的钠在电场下的运动行为

本文研究了铝熔体中钠在电场作用下的运动状态,考察了电流密度、处理时间对铝含钠量的影响,找出了影响除钠的因素,同时对除钠机理作了探讨。     

NaOH浓度对NiTi形状记忆合金表面类骨磷灰石形成的影响

研究了不同浓度NaOH对NiTi形状记忆合金在模拟体液(SBF)中诱导磷灰石沉积的影响，用XRD，ESEM，FTIR及XPS等分析了碱处理前后试样表面的结构、形貌、基团和组元化合价的变化，结果表明，经1mol／L NaOH溶液处理的NiTi合金因为钛酸钠的生成而具有较高的生物活性，在SBF中浸泡3d后自然沉积含CO3^2-的类骨磷灰石，而且原子吸收光谱分析其在Hank’S溶液中的镍离子溶出量最少，随着碱处理浓度的提，NiTi合金表面除钛酸钠外，还有镍酸钠生成，使磷灰石形核的孕育期加长，在Hank’S溶液中的镍离子溶出量也明显增加。     

高品质铝-镁合金焊丝熔体质量控制技术

探讨本试验设计的铝-镁合金焊丝的熔体质量控制技术.采用等离子净化除气装置、无钠型辅料及除钠剂等,获得了性能优良的制备铝-镁合金焊丝的铸锭.对铸锭采用同体检测方法检测其氢含量小于0.15cm3/(100g),ω(Na)≤10-5.对均匀化处理前、后样品进行了光学金相、扫描电镜、透射电镜微观组织分析及能谱分析.试验结果表明,焊丝的成分设计合理,其熔体质量控制技术可行,样品的组织分析中未见有害粗大的初生相和杂质相,组织细小、均匀,未见明显气孔.     

超声波熔体处理方法对纯铝铸锭凝固组织的影响

研究了超声波熔体处理方法对纯铝铸锭凝固组织的影响，分析了没有添加除气剂不进行超声波处理、只添加除气剂不进行超声波处理、既添加除气剂又进行超声波处理的情况，以及超声波对纯铝凝固组织影响的原因。研究结果表明，采用合适的超声波振动处理时间，可以提高铸锭晶粒的细化率。     

钠硅渣湿法处理技术研究

介绍了工业中处理钠硅渣的方法,且介绍了国内外处理钠硅渣的几种方法,其中包括高压水化法、水热法、碳酸钠法、和最新开发的苛性碱法,并且对这几种方法的工艺原理和特点进行了分析,并指出苛性碱法是钠硅渣湿法处理工艺中最有前景的方法。     

钠硅渣综合利用途径

钠硅渣是烧结法氧化铝生产过程产出的废渣．为了回收其中的氧化铝和氧化钠．生产上主要是回头配料．由于其品位较低,降低了氧化铝厂的技术指标,所以．最好的方案就是把钠硅渣分离出来单独处理。结合我们近期所做的研究．表文列出了钠硅渣处理的四种方案：火法处理,钠硅渣回头配钙烧结,回收氧化铝、氧化钠;碱法处理钠硅渣制备洗涤用4A沸石：酸法处理钠硅渣制备冰晶石、硅胶等产品;钠硅渣制备牙膏研磨剂或做为阻燃剂添加;这几种方案都在研究过程中。如果能为钠硅渣找到一条综合利用的渠道,就可以为烧结法氧化铝的提高产能降低成本作出贡献。     

膨润土的改性及应用

钙基膨润土进行充分钠化处理后,其湿压强度、热湿拉强度、复用性将得到很大提高。钠化处理时,钠化度要低于钠化最高值,才适合铸造使用,新的改性处理使钠化膨润土性能进一步提高。     

铸造镁合金旋转喷吹除气的试验研究

研究了旋转喷吹技术在AZ91镁合金熔体除气净化处理上的应用。采用减压凝固法考察了旋转喷吹的除气净化工艺的净化效果，确定了最佳的除气时间。利用金相显微镜观察了除气前后合金的微观组织。对除气前后的合金，进行了金属型和低压砂型铸造试验浇注，并对其力学性能进行了测试和比较。研究结果表明，经过30min旋转喷吹除气处理后，能快速显著地降低镁合金中的含气量，AZ91合金金属型和低压砂型试样的力学性能都明显地得到提高，特别是合金的伸长率得到大幅度的提高。     

铸造车间铝熔体的除气和净化

本文首先介绍铝熔体除气的一般方法，接着详细论述了旋转除气方法和各种旋转器的除气效果。含氢量采用熔体试样在真空中凝固的方法测量。利用所得到的铝合金的可比较气孔率，能测量出温度和时间对除气效果的影响。气孔率随旋转除气处理的时间增长呈指数下降，每隔１．５分钟下降一半。因此，能够控制除气量。本文最后对旋转除气处理的成本做了分析。     

铝合金表面无铬化学转化膜的研究

采用钼酸盐、高锰酸盐作为成膜氧化剂,研究了铝合金化学转化膜的处理溶液,优化了溶液配方与工艺参数,在铝合金表面制备出有良好耐蚀性的转化膜.利用各种测试手段与分析方法,对转化膜的综合性能进行分析,对转化膜的微观形貌与元素组成进行表征.提出了钼酸盐化学转化膜成膜机理.     

Effect of oxygen on liquid sodium embrittlement of T91 martensitic steel

The liquid sodium embrittlement susceptibility of the T91 steel in a standard metallurgical state has been studied with varying dissolved oxygen levels. The experimental procedure consists of a pre-exposure wetting step in static sodium before mechanical testing in liquid sodium. The oxygen impurity plays the role of a wetting promoter that facilitates LME of the T91 steel rather than taking part in the fracture process. Brittle grain boundary decohesion is observed using transmission electron microscopy on focused ion beam prepared foils. This settles the issue about the susceptibility of steels to liquid metal embrittlement in liquid sodium.     

The effect of concentration of sodium chloride on the anodic behavior of bismuth and lead

A comparative study of the kinetics of the dissolution of bismuth and lead in the passive state has been performed under depassivation and repassivation depending on the concentration of sodium chloride. Analysis of the major regions of the polarization curve is presented. For each of the metals, the regions of primary stability have been determined.     

Sodium Treatment of Copper Dross

A new patented process for recovering lead from rough copper dross by sodium treatment was implemented at Asarcoys Glover Smelter in 1979. The basic metallurgical principles of the process are explained, and current plant operating procedures and results are described. The advantages of the sodium process, as compared to traditional dross treating in a reverberatory, and its possible application to treating complex lead blast furnace drosses are discussed.     

热处理网带炉技术发展与市场预测

从智能化热处理，高质量热处理，低成本热处理和清洁热处理四个方面简述了廿一世纪网带炉技术的发展趋势，分析了网带炉的生产形势和国内外的市场需求。     

Throwing Power of Plating Solutions with Particular Reference to Certain Zinc Plating Solutions

The electrodeposition of speculum from solutions containing sodium stannate, sodium cuprocyanide, free sodium hydroxide and free sodium cyanide, with and without addition of sodium carbonate, using separately controlled tin and copper anodes, has been investigated and conditions for obtaining satisfactory deposits of constant composition have been worked out. A study has been made of the influence of variation in the concentrations of tin, copper, free hydroxide and free cyanide in the solution, and of alteration in temperature and in current density on the composition of the deposit and efficiency of deposition. Anode conditions have been examined and information obtained on the factors on which the efficiency of dissolution of the tin and copper depends. The ageing of speculum solutions is explained and consideration is given to the addition of sodium carbonate to the bath as a means of increasing its stability. A preliminary survey of the potentialities of baths containing potassium salts in place of the corresponding sodium salts has been made.

Analytical methods for determining the composition of the electrolyte and deposit have been put forward.     

Oxidation/reduction Reactions of molybdate ions in sodium sulfate at 1200 K

Cyclic voltammetric studies have been used to elucidate the electrochemical and coupled chemical reactions of solute molybdate ions on sodium sulfate at 1200 K in different melt basicities fixed by SO₂-O₂ atmospheres. The reaction mechanism was determined by use of the Nicholson and Shain diagnostic criteria in combination with the phase stability diagram. Within the regime of sodium sulfate stability, three reduction reactions occur. In a highly acidic melt, the reduction of molybdate ions (Mo in + 6 oxidation state) to Mo as + 4 is coupled to an irreversible chemical reaction whereby molybdenum dioxide precipitates. Molybdenum in oxidation state + 4 is reduced to Mo-(+2)-species which are immediately reoxidized to Mo-(+4)-species by an oxidizing agent in the melt, a so-called catalytic reaction. The reduction of Mo-(+2)-species to molybdenum follows in a very narrow potential range close to the previous reaction and has the same catalytic reaction mechanism. The reduction reactions are reversible. The reverse oxidation of molybdenum to the molybdate ion proceeds in three electron transfer steps.     

铝电解TiB2/C阴极材料钠膨胀瞬态应力模型及其数值分析

为了获得铝电解过程中湿润性TiB2/C复合阴极材料由于钠膨胀而受到的应力及其变化规律的具体数值,本文建立了钠在阴极试样中的渗透膨胀过程数学模型,通过解析法计算分析了电解过程中钠在阴极试样中各处钠浓度和应力场及其在时间上的分布规律;并通过钠膨胀实验验证了所建模型的合理性.通过此模型可以预测由于钠膨胀在阴极中造成的破损规律,从而可以在数值上指导电解槽的设计和电解操作工艺参数的选择,对于延长铝电解槽寿命具有很重要的现实意义.     

甲状腺功能减退患者甲状腺素替代治疗临床分析

目的: 研究甲状腺功能减退患者甲状腺素替代治疗的临床价值。方法: 选择120例原发性甲状腺功能减退患者作为研究对象,在给予左甲状腺素钠片治疗6个月后检测甲状腺功能相关指标、心功能相关指标以及血脂相关指标。结果: 治疗后,患者促甲状腺激素刺激激素(TSH)、TG、TC、低密度脂蛋白(LDL)、载脂蛋白B(ApoB)含量、A峰明显低于治疗前(P＜0.05);FT3、FT4、高密度脂蛋白(HDL)、载脂蛋白A-Ⅰ(ApoA-Ⅰ)含量、E峰、E/A值、左心室射血分数(LVEF)、左心室舒张末期内径(LVEDD)明显高于治疗前(P＜0.05)。结论: 甲状腺素替代治疗能够有效改善甲状腺功能、心功能以及血脂相关指标,具有积极的治疗意义。     

Desiliconization kinetics of nickeliferous laterite ores in molten sodium hydroxide system

A novel process was proposed for treating nickeliferous laterite ores with molten sodium hydroxide.The effect on silicon extraction caused by the factors,such as stirring speed,reaction temperature,particle size and NaOH-to-ore mass ratio,was investigated.The results show that increasing stirring speed,reaction temperature and NaOH-to-ore mass ratio while decreasing particle size increases silicon extraction rate.The desiliconization kinetics of nickeliferous laterite ores in molten sodium hydroxide system ...