煤矿高压喷雾雾化粒度的降尘性能研究

从理论、实验和现场试验3个方面对高压喷雾雾化粒度的降尘性能做了深入的研究;对高压喷雾降尘机理进行了分析,提出了雾化粒度D50的计算式和雾化粒度捕捉最小粉尘粒度的相互关系式;利用测试范围在5～2 000 μm的Winner313激光粒度分析仪和喷嘴雾化测试系统,对煤矿常用的5种压力式喷嘴进行了4,6,8和10 MPa共4个压力下的雾化粒度测定,得到了喷嘴雾场不同位置的D10,D50,D90,D[3,2],D[1,3]平均粒径分布和650 μm以下的粒径分布,雾场位置(150-9)处的粒径随压力增加雾化粒度变小;根据理论、实验数据和综放工作面煤尘实际测定的粒径分布,确定了该面的喷雾降尘压力和喷嘴型号,通过现场应用,煤机外喷雾和支架喷雾压力从2 MPa提高到8 MPa后,移架工序的全尘由536.2 mg/m3降到97 mg/m3.     

水溶性聚苯胺纳米粒子对碳钢的缓蚀作用

采用分散聚合法合成了水溶性聚苯胺(PANi)纳米粒子,并利用红外光谱、电子扫描电镜和激光粒度仪观察该聚合物的结构和粒径分布。采用极化曲线和电化学阻抗谱研究该水溶性聚苯胺纳米粒子对碳钢在1mol/L HCl溶液中的缓蚀作用。结果表明:聚苯胺纳米粒子可在碳钢表面吸附成膜,从而有效降低其腐蚀速率,当缓蚀剂的质量浓度为0.5g/L时,缓蚀率达到95.6%。     

氧化铝-氧化铈核/壳复合磨料的性能测定

以α-Al2O3为核、以氧化铈为壳,制备氧化铝-氧化铈核/壳复合磨料,并对其性能进行测定.使用激光粒度分析仪测定粒度分布,使用FD-TC-B型导热系数测定仪测定复合磨料的导热系数,使用分光光度计测定透光率.氧化铝-氧化铈核/壳复合磨料的粒径分布较集中,导热性能较单一磨料好,透光率小,分散性能好,浆料质量浓度达到2％时,抛光效率最高,适合玻璃抛光.     

不锈钢粉尘的粒度与元素分布对回收利用的影响

本研究对不锈钢粉尘粒度作了分析,并对不同粒度的不锈钢粉尘进行分组,按照不锈钢粉尘的粒度大小进行观察和分析。其中采用X射线能谱4E（EDS）分析了不锈钢粉尘的形貌、元素组成。结果表明不锈钢粉尘中较大颗粒较多,而且不锈钢粉尘中的颗粒均为多个细小粉尘颗粒的聚合物。不锈钢粉尘中较大颗粒中含有的铁元素较多,而粒径较小的颗粒中含有的cr和Ni较多,若作为不锈钢回收利用,可将不锈钢粉尘筛分之后,采用粒度较小的不锈钢粉尘作为原料。本研究结果可为不锈钢电弧炉粉的处理及综合利用提供数据。     

导电银胶用片状银粉的制备

采用机械球磨法制备片状银粉,通过扫描电镜(SEM)、激光粒度分析仪和热重分析仪表征了银粉的形貌、粒度及纯度,研究球磨介质、球磨时间以及球磨前驱体球形银粉的形貌对片状银粉形貌及粒度的影响。结果表明,以乙醇为球磨介质,球磨时间为15 h,并采用粒径均一的球形银粉为球磨前驱体,能够机械球磨制备片状率高,粒径大小在4~6μm且均匀的片状银粉。将片状银粉配制成银胶,印刷并固化成线路后,测试了其电导率,达到了应用指标。     

纳米镍基合金粉的超声波液相还原制备法

以次亚磷酸钠为还原剂，通过控制液相还原反应条件，从硫酸镍溶液中制备出纳米镍磷合金粉。研究了超声波功率、冷却方式、包覆剂用量等因素对镍磷合金粉的形貌、尺寸和分布以及包覆后的纳米镍磷合金粉的抗氧化性的影响。激光粒度分析仪分析表明粉末粒径分布均匀，中值粒径为50～65nm；TEM和XRD检测结果显示这种粉末粒子呈类球形，为非晶态结构。     

喷雾干燥法制备球形钨粉及还原过程的研究

以偏钨酸铵(AMT)为原料,采用喷雾干燥法结合氢气还原方法成功制备出球形钨粉。随后利用SEM、TEM、激光粒度分析仪和XRD等分析方法对粉末微观形貌、颗粒平均粒度、粒度分布和还原过程中的相变情况进行研究。结果表明,前驱粉末为球形,煅烧后,颗粒形貌未发生明显变化,仍保持球形;TEM结果显示粉末是球形中空结构。同时探讨了溶液浓度、鼓风速度、给料速度对粉末粒度的影响。激光粒度分析结果表明,溶液浓度对粉末的平均粒度影响最大,溶液浓度越大,颗粒的平均粒度就越大。粒度分布越集中,而给料速度对颗粒的平均粒度影响不明显。XRD结果显示,氢气气氛下,550℃保温2h,α-W相出现;还原温度升高到750℃,保温2h,WO3被完全还原为α-W。     

纳米碳酸钙表面特性对PS/纳米CaCO3体系的影响

研究了偶联剂NDZ-101对纳米碳酸钙团聚体性能的影响.采用熔体剪切分散法制备了聚苯乙烯基纳米碳酸钙复合材料,利用粒度分析仪观察并分析了纳米碳酸钙团聚体的特征(包括团聚强度和内摩擦系数)对其在复合材料中分散程度的影响,并进一步研究了纳米碳酸钙表面性能对聚苯乙烯基纳米碳酸钙复合材料性能的影响.结果表明经1%(质量分数,下同)左右的NDZ-101处理的纳米碳酸钙在聚苯乙烯基体中的分散粒径最小,其特征粒径达196 nm.聚苯乙烯基纳米碳酸钙复合材料的玻璃化转变温度、熔体粘度和储能模量等性能都随偶联剂NDZ-101的增加呈先升后降的趋势.     

活性模板法制备纳米镍粉体

采用活性模板法制备了高纯纳米镍(Ni)粉体。研究了影响纳米粉体性能的各种因素，通过X射线衍射(xRD)、透射电子显微镜(TEM)和激光粒度分析仪等手段对样品的成分、形貌、粒度及其分布进行了分析，探讨了活性模板的作用机理。结果表明：模板介质炭黑具有微反应器作用、空间位阻效应和较强的还原性，活性模板法制得的纳米Ni粉呈规则的球形链状分布，无明显团聚体，平均粒径为45．7nm，粒径分布窄，粒径范围在16．0nm～59．1nm。     

不同实验装置测定粉尘湿润剂的湿润效果相关性

采用滴液法、正向渗透法和反渗湿润法分别研究了3种阴离子型湿润剂对10种硫化矿粉尘的湿润效果,比较了不同实验装置研究湿润剂湿润粉尘的相关性.结果表明:温度约20℃时,使用上述3种实验方法对相同的试剂和粉尘做湿润实验没有相关性,许多情况下还出现完全相反的结果;而对于相同的实验装置,3种湿润剂都具有较好的相关性.由此可以看出,实验室研究湿润剂所采用的方法在原理上要与应用现场的特征相适应,否则就将适得其反.     

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.     

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.     

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.     

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。     

A STUDY OF TEMPERATURE-DEPENDENT VALENCE BOND STRUCTURE OF TITANIUM

On the basis of energy and shape method for the determination of the valence bond (VB) structures of crystal, the valence bond structure of titanium is redetermined at room temperature and calculated in the whole temperature range of 0-1943K. The outer shell electronic distribution of Ti is e_c~(2.9907) · (s_c~(0.4980) d_c~(2.4927)) ef1.0093 in crystal. The temperature dependences of the VB structures of hcp and bcc phases are the same. The VB structures of hcp and bcc phases monotonically increase or decrease with the increase in temperature, but show discontinuous changes at the phase-transformation temperature 1155K.     

Structural Optimization of Electromagnetic Swirling Flow in Nozzle of Slab Continuous Casting

During the slab continuous casting process, the flow field of molten steel in the mold plays a decisive role in the quality of the slab. In this paper, electromagnetic swirling flow in nozzle technology is proposed to control the flow field in mold.This technology can drive molten steel to rotate inside the submerged entry nozzle by electromagnetic force, thereby controlling the flow field. This research shows that it can reduce the impact of molten steel on the bottom of nozzle and partly reduce the negative pressure at the upper part of nozzle outlet which is even eliminated by optimizing the structure and angle of nozzle. The area of heat flux of the mold wall becomes larger, and the crest value of heat flux gets lower than that without swirling in nozzle and any nozzle optimization. The meniscus fluctuates smoothly, and the flow velocity at the top surface is within a reasonable range. The temperature field distribution in the mold is uniform which was beneficial to the growth of equiaxed crystal and decreased element segregation.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).