紫外分光光度计法测定铁矿石中全铁的不确定度评定

通过紫外分光光度计测定铁矿石中全铁的不确定度评定,分析了该方法测定过程中的不确定度来源,建立了数学模型,并计算了各不确定度分量、合成不确定度、标准不确定度等。该方法适用于评定测量低含量全铁的不确定度,其方法流程简单,结果准确、可靠。     

电化学氧化煤浆特性研究

采用伏安法对六种煤浆的电解氧化特性进行研究,考察了煤种、铁离子溶液催化剂、温度和搅拌速度对氧化电流密度的影响。结果表明,温度、电压和转速的增加可以提高其氧化电流密度,在室温下加入5 mmol Fe3+,可以使神木煤浆的氧化电流密度提高至18.4 m A/cm2。通过XRD分析可知,电解破坏煤的大分子结构。     

Lime-induced iron chlorosis in sugarcane

Lime-induced chlorosis is a potential problem on most calcareous soils particularly in arid and semi-arid climates affecting most of the plants grown on them. Bicarbonates, phosphates, calcium, iron inactivation in plant tissue and organic anions have been held responsible as the mechanism leading to the disorder which is still not fully understood, and there is a lack of agreement as to the primary factor responsible for lime-induced chlorosis. To date, no hypothesis has adequately explained why chlorosis occurs on some high lime soils and not on others. Likewise, the nutrient ratios, K/Ca, P/Fe and Fe/Mn considered as diagnostic criteria for lime-induced chlorosis, have shown inconsistency. The presence of calcium carbonate, bicarbonate, calcium and imbalance of nutrient cations in the growth medium, injudicious addition of phosphates, quality of irrigation water, and other soil and plant factors have been held responsible for the disorder. Amelioration of lime-induced chlorosis by (i) acidification of calcareous soils, (ii) use of iron salts, (iii) use of synthetic iron chelates, and (iv) by management practices including the selection and development of varieties resistant to lime-induced iron chlorosis, is discussed. Suggestions for future research work are made.     

合金铁丸代替白口铁丸的研究

针对白口铁丸在实际应用过程中不耐磨易破碎的现象,在白口铸铁中通过添加合金元素及适当热处理等手段生产合金铁丸,试验表明,该铁丸 既具有较高硬度,又有良好的韧性,使用寿命得到提高。     

热变形量对白口铸铁冲击疲劳性能的影响

利用冲击疲劳试验机,研究了不同变形量的白口铸铁冲击疲劳性能。结果表明,变形量在10%～40%范围内、变形量越大,网状共晶碳化物破碎越严重,冲击疲劳性能越好。     

热处理对铸铁基多孔陶瓷复合材料组织与性能的影响

研究了热处理对铸铁基多孔陶瓷复合材料组织与性能的影响，结果表明，热处理正火，淬火均可不同程度地提高该复合材料的整体强度与耐磨性，而不影响铸铁－陶瓷的界面结构及材料的透气性。     

合金元素Si—Al—Cr对铸铁高温腐蚀性能的影响

论述了合金元素Si、Al、Cr的耐高温腐蚀性能,上述三种元素在高温下形成氧化膜的PB比在1－2间,电导率较小和较少的晶格缺陷,并且具有良好的热力学稳定性,可起到很好的高温防护作用,是耐热铸铁的首选元素。     

Tape casting of high dielectric ceramic substrates for microelectronics packaging

The production of ceramic green tapes is integral to the production of multilayer ceramic packages and capacitors. This article presents a batch type process for producing alumina ceramic green tape down to 150 μm thickness. The process parameters relevant to the precise control of the thickness of an aluminabased ceramic tape have been investigated using a float glass tape caster. Results indicate that the cast tape thickness was dependent on the blade gap until it reached a limiting value. This limiting thickness in turn was dependent on the casting speed, with a higher speed producing thinner tapes. Optimal casting was shown to exist when the blade gap was set at or beyond the limiting value, with the casting speed the controlling factor for the final thickness.     

扫描隧道显微镜功函数信息成像方法

在自行研制的超高真空扫描隧道显微镜基础上,利用信号调制技术,建立了表面功函数信息成像方法,介绍ＳＴＭ功函数信息成像方法的原理,并利用该方法同时获得样品表面同一区域的形貌信息和功函数信息像。结果表明,利用功函数信息成像技术可以实现区分样品表面的元件及其分布。     

表层石墨球化的灰铸铁件外表层片状石墨的防止

利用含有稀土的涂料实现了表层石墨球化的灰铸铁件,其组织形态由外到内依次为球化区、过渡区和灰铸铁本体。生产中发现,在某些条件下,已经实现了表层石墨球化的灰铸铁件的外表层又出现片状石墨。为防止这种现象发生,进行了研究。