关于碳化硅作为超低碳钢连铸结晶器保护渣熔速调节剂的研究

本文研究了碳化硅（SiC）作为保护渣熔速调节剂的特性及作用机理,研究表明,以SiC替代炭质材料可大大降低保护渣对超低碳钢连铸坯的增碳和渗碳量。     

中锰白口铸铁热塑性变形规律的探讨

为开发磨球成形新工艺——水平连铸白口铸铁棒材斜轧成球的工艺。采用高温压缩、高温扭转试验方法，研究了中锰白口铸铁的高温塑性变形能力，测定了温度与极限变形率，温度与变形抗力的关系曲线。对塑性变形后的组织进行了分析。结果表明：中锰白口铸铁在８５０～１０００℃具有良好的塑性变形能力，热塑性变形后碳化物成断网状和孤立块状，从而可使中锰白口铸铁的韧性提高     

PSA UF膜选择透过性研究（Ⅱ）膜结构与性能

研究了聚砜酰胺分子量及其分布对铸膜液和膜结构与性能的影响。发现,分子量过小主要影响膜的完整性。在不影响膜完整性的前提下,则膜的孔径随分子量减小而减小,而窄的分子量分布则总是导致膜透水率与截留率的同时提高。     

Evaluation of hybrid laser-cut and cast miniature fracture specimens

This paper presents a new hybrid laser-cutting method for producing fracture test specimens from thermosetting materials. The hybrid approach combines casting of a sheet of material with subsequent laser-cutting of the test specimens. The new approach was compared to the traditional casting method using a fracture toughness test. For this study, a compact version of the tapered double cantilever beam (cTDCB) was used as a specimen geometry for both manufacturing methods. The cTDCB specimen is crack length independent, and crack length investigations were performed to ensure the crack length independence of the cTDCB specimens. The specimens that were made by the hybrid laser-cut method were found to be comparable to the specimens obtained by the traditional casting method. Moreover, the laser-cut method provides a fast and accurate method to make a significant number of samples in a reasonable time. These tests show that the hybrid laser-cut method could be a good alternative to the traditional casting method.     

氘代聚合物膜靶制备技术与性能研究

 氘代聚合物膜是快点火基础物理实验的一种重要靶型。通过氘代苯乙烯单体的本体自由基聚合反应制备氘代聚苯乙烯，并利用流延法和浇铸法制备出厚度从几十nm到数百μm的膜靶。溶剂挥发过程中的随机扰动对膜厚均匀性造成影响，采用清洁的基片和在涂沫基片或模具外加防护罩可以降低这种影响。采用PVA作脱膜剂有利于获得较薄的聚合物薄膜。DSC分析表明薄膜的玻璃化转变温度与热处理过程有关，缓慢退火有利于提高Ｔ-g和储能模量。     

ICP-AES法测定铸造铝合金中的痕量钙

采用ICP AES法研究铝轮毂用铸造铝合金中痕量钙的测定。以补偿法消除共存元素钛对钙的测定干扰。并运用铝基体工作曲线来消除铝基的影响,以提高分析的准确度。无需分离主体铝,方法的回收率在95.3%～105.5%之间,RSD≤5.5%。可满足铸造铝合金中钙质量分数大于0.001%的测定。     

Morphology and physical properties of poly(ethylene oxide) loaded graphene nanocomposites prepared by two different techniques

Organic–inorganic hybrids are artificially created structures presenting novel properties not exhibited by either of the component materials alone. In this contribution one addresses processing, morphology and properties of polymer nanocomposites reinforced graphene. First, synthesis routes to graphite oxide (GO) and foliated graphene sheets (FGS) are illustrated. Physical characterization of these graphene sheets were conducted using atomic force microscopy and X-ray diffraction techniques. Processing, structure and properties of graphene/poly(ethylene oxide) (PEO) nanocomposites are discussed. FGS was dispersed into PEO via two different composite manufacturing techniques: melt compounding and solvent mixing. Morphology of dispersed graphene and properties from different blending routes are compared. TEM showed that graphene distributed parallel to the composite surface using solvent method, while distributed randomly in melt blended method. Optical measurements indicated that the transparency of PEO/graphene prepared by solvent method is higher than that of melt blended method in the visible region. Electrical conductivity measurements are employed to evaluate threshold concentration for rigidity and connectivity percolation. The percolation concentration of the composites prepared by solvent method is less than those of melt blended method. The mechanical performance of the composites prepared by solvent method is higher than melt blended. Halpin–Tsai model has been used to confirm the distribution of the graphene into PEO by the two different processing techniques.     

高锰铝青铜ZCuAl8Mn14Fe3Ni2最佳熔炼化学成分筛选

运用正交试验设计的方法,筛选出了高锰铝青铜ZCuAl8Mn14Fe3Ni2熔炼的最佳内控化学成分范围,对开发生产该合金铸件具有重要的意义.试验表明:用该高锰铝青铜材料制造冶金备件产品时,锰含量宜以中限控制,铝含量宜以下限控制,镍控制在2%左右为最佳,铁控制在3%左右为最佳.     

4105发动机缸体铸件渣气孔成因分析及对策

对4105发动机缸机缸体铸件出现的批量渣气孔现象进行了分析.电镜分析和能谱分析表明渣气孔是渣致皮下气孔.其批量出现的原因主要是各种变化因素的不确定性已超出了工艺的承受能力,不能简单地认为是工艺不合理,为了证实分析结果,进行了试验验证,在此基础上提出了最大限度减少铸造缺陷的方法措施,很好地解决了生产中废品率高的问题.     

微透镜阵列的铸塑复制技术

在光刻热熔成型以及电铸复制得到的微透镜阵列镍板基础上,采用静态铸塑技术,得到了高质量的PMMA微透镜阵列。本文介绍了静态铸塑的聚合反应理论基础、模具设计以及工艺过程。最后对微透镜阵列的复制精度进行分析,结果表明复制精度优于0.5μm.