铝酸钙水泥物相定量的计算方法

本文根据铝酸钙水泥中各物相的Ｘ射线衍射特性，采用无标相定量分析方法，导出了适用于铝酸钙水泥物相定量计算的公式。采用此公式，可对铅酸钙水泥中ＣａＯ·Ａｌ２Ｏ３。ＣａＯ·２Ａｌ２Ｏ３、１２ＣａＯ·７Ａｌ２Ｏ３和α－Ａｌ２Ｏ３的含量进行快速而较准确的测定，对铝酸钙水泥的开发研制与生产具有重要意义。     

钛及其合金涂层的生物仿生方法

几个月前，在美国夏威夷举行的第六次世界生物材料会议上，各国的研究学者提出了很多生物仿生涂层的方法。下面简要介绍几种有关钛及其合金的生物涂层方法．１矫形种植体上生物仿生涂层 样品为Ｔｉ—６Ａ１—４Ｖ合金块，经氧化铝粉末喷砂处理，平均粗糙度为３．０μｍ。用丙酮、酒精和去离子水超声清洗后，依次浸入两种溶液中，在 ３７℃下保持 ２４ｈ。这两种溶液均由ＮａＣｌ、ＣａＣｌ２·２Ｈ２Ｏ、ＭｇＣｌ２·６Ｈ２Ｏ、ＮａＨＣＯ３和 Ｎａ２ＨＰＯ４· ２Ｈ２Ｏ在二氧化碳气氛下溶于水，配制而成，但第一种溶液中的Ｍｇ~２＋、ＨＣ…     

DBCDAA分光光度法测定微量钯

ｐＨ９．７～１０．６的Ｎａ２ＣＯ３－ＮａＨＣＯ３缓冲介质中，有乳化剂ＯＰ存在８０℃水浴加热５ｍｉｎ后，Ｐｄ（Ⅱ）与邻菲罗啉和２，６－二溴－４－羧基苯基重氮氨基偶氮苯（ＤＢＣＤＡＡ）形成组成比为１∶１∶２的红色三元配合物，其最大吸收波长和对比度分别为５２４ｎｍ和１２６ｎｍ，表观摩尔吸光系数为７．１６×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，线性范围为０～０．６０μｇ／ｍｌ，配合物至少稳定２４ｈ。用交换树脂分离，方法用于测定二次合金中微量Ｐｄ，相对误差为－５．９％，相对标准偏差为３．８％（ｎ＝６）。     

1,1—二乙基—3—丁烯基环戊二烯基稀土二氯化物的合成与表征

合成了１,１－二乙基－３－丁烯基环戊二烯基稀土二氯化物,并用元素分析、质谱、红外光谱和核磁共振表征了这类配合物的组成为［Ｃ,Ｈ４Ｃ（Ｃ２Ｈ５）２ＣＨ２ＣＨ＝ＣＨ２］ＬｎＣｌ２·ＭｇＣｌ２·ＴＨＦ（Ｌｎ＝Ｌａ（１）,Ｎｄ（２）,Ｓｍ（３）,Ｇｄ（４）。     

Ti／RuO2＋Sb2O3＋MnOx／MnOx阳极的性能研究

对Ｔｉ／ＲｕＯ２＋Ｓｂ２Ｏ３＋ＭｎＯｘ／ＭｎＯｘ阳极进行了ＳＥＭ，ＥＤＳ研究，考察了该电极在８０℃，１ｍｏｌ·Ｌ－１Ｈ２ＳＯ４中的使用寿命，测定了该电极的电化学动力学参数ａ、ｂ、ｉ，并用双位垒模型讨论了其电催化性能，结果表明该电极在Ｈ２ＳＯ４中的使用性能优良。     

贵金属光学金相图谱之九

Ｐｄ－４２Ｉｒ合金（４０×）腐蚀剂ＨＮＯ３,铸态,粗大均匀的等轴晶。ｂ．Ａｇ－Ｃｕ－Ｓｉ合金（１２０×）腐蚀剂ＮＨ３＋少量Ｈ２Ｏ２,铸态,经５５０℃／２５ｄ处理,树枝晶。ｃ．Ａｕ－１６Ｎｉ－１０Ｐｄ合金（６４×）腐蚀剂ＣＨ１＋ＨＮＯ３＋Ｈ２Ｏ,在ＮＨ...     

激光调阻钌酸盐厚膜电阻浆料研究

介绍一种新的钌酸盐电阻改进体系，该体系中用Ｐｂ２Ｒｕ２Ｏ６代替钽钌酸铅（Ｐｂ２Ｒｕ２Ｏ６和Ｐｂ２Ｔａ２Ｏ７）作导电相，用硼硅酸铅玻璃代替硼硅酸铅锌锆玻璃，完全不用ＢａＴｉＯ３，ＰｂＴｉＯ３作为高阻ＴＣＲ改性的掺杂剂，该体系制作的１００ＫΩ／□以上了电阻激光调阻稳定，电阻漂移小于±１％。     

电渣重熔用CaF2＋Al2O3和CaF2＋Al2O3＋CaO系熔渣传氧的研究

利用ＺｒＯ２固体电解质氧浓差电池测定了电渣重溶用ＣａＦ２＋Ａｌ２Ｏ３和ＣａＦ２＋Ａｌ２Ｏ３＋ＣａＯ系熔渣的氧渗透率，考察了熔渣成分及温度对熔渣传氧性能的影响。在１６７３－１８７３Ｋ和０．１ＭＰａ的氧气氛下，测得这两个渣系熔渣的氧渗透率分别为１×１０＾－２０－６×１０＾－１９和１×１０＾－２１－５×１０＾－１８ｍｏｌＯ２．ｃｍ＾－１．ｓ＾－１；随ＭｎＯ２，Ｆｅ２Ｏ３，Ｃｒ２Ｏ３，ＴｉＯ２，ＣａＦ２含     

三水氟化铝脱水过程中水解率的计算

本文通过对ＡｌＦ３·３Ｈ２Ｏ脱水过程的氟平衡分析，推导出了ＡｌＦ３的水解率计算公式，并列举了计算实例。     

协同系数补偿的动力学方法用于钼和钨同时测定的研究

以Ｉ３－淀粉配合物为指示剂，用停流ＦＩＡ光度法研究了钼（ＶＩ）和钨（ＶＩ）对Ｈ２Ｏ２－Ｉ氧化还原反应体系的协同催化效应，并定义了协同催化系数Ｄ以表示这种协同作用的大小。将此系数引入到停流ＦＩＡ－动力学体系多组份同时测定的方法中，可有效地补偿吸光度对加和性的偏离，并可降低检出限。用本法测定钼（Ⅵ）和钨（Ⅵ）的线性范围分别为０～１．１μｇ·ｍｌ－１和０～２．０μｇ·ｍｌ－１，而未补偿时则分别为０～０．６μｇ·ｍｌ－１和０～０．８μｇ·ｍｌ－１。测定了钢样及模拟样品中的用和钨含量，结果满意。钼、钨的回收率分别为９７．３％～１０２．８％，９６．５％～１０２．１％，相对标准偏差ＲＳＤ分别为２．１％～２．９％，２．３％～３．４％。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

THERMODYNAMICS STUDY ON THE DECOMPOSITION OF CHROMITE WITH KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

INFLUENCE OF HEAT TREATMENT ON DAMPING BEHAVIOUR OF THE MAGNESIUM WROUGHT ALLOY AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X(X=Cr,Ta,Mo,Nb,Zr) Multilayer Films Adherent to Polyimide Substrates

An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quantitatively estimate the interfacial energy of the nanostructured multilayer films(NMFs) adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be *5.0 J/m2 for Cu/Cr, *4.1 J/m2 for Cu/Ta,*2.8 J/m2 for Cu/Mo, *1.1 J/m2 for Cu/Nb, and *1.2 J/m2 for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.     

High-Speed Friction Stir Welding of SiC_p/Al–Mg–Si–Cu Composite

A 17 vol% SiCp/Al–Mg–Si–Cu composite plate with a thickness of 3 mm was successfully friction stir welded(FSWed) at a very high welding speed of 2000 mm/min for the first time. Microstructural observation indicated that the coarsening of the precipitates was greatly inhibited in the heat-affected zone of the FSW joint at high welding speed, due to the significantly reduced peak temperature and duration at high temperature. Therefore, prominent enhancement of the hardness was achieved at the lowest hardness zone of the FSW joint at this high welding speed, which was similar to that of the nugget zone. Furthermore, the ultimate tensile strength of the joint was as high as 369 MPa, which was much higher than that obtained at low welding speed of 100 mm/min(298 MPa). This study provides an effective method to weld aluminum matrix composite with superior quality and high welding efficiency.