共查询到16条相似文献,搜索用时 125 毫秒
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研究了不同MgO含量下烧结矿表观形貌的冶金性能与多重分形参数之间的对应关系.结果表明:多重分形可用于烧结矿的定量表征;Δα值的大小反映了整个分形结构上概率测度即磁铁矿分布的集中性和均匀性;f(α)max的值反映分形结构上概率测度即磁铁矿数量的多少. 相似文献
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通过烧结杯试验制备了不同碱度和不同MgO含量2个系列的低硅烧结矿样品。利用XRD(X射线衍射仪)和TEM(透射电子显微镜)分别对样品的结构和表面形貌进行了表征。随碱度和MgO含量提高,CaFe2O4和Fe3O4含量发生了显著变化;孔隙结构由柱状变为溶蚀网状,更加复杂。利用单重分形软件和表面分形模型分别计算了2个系列样品的表面分形维数([Dss]和[Dsv])。随着碱度和MgO含量提高,表面分形维数增加;利用表面分形模型计算的[Dsv]和[Rsv](线性相关系数)大于单重分形软件计算的[Dss]和[Rss],表面分形模型可以反映更多细节,且相关性更好。因此可以用表面分形模型替代传统的单重分形软件来表征孔隙结构的复杂性,解决了孔隙表面形貌拍摄的困难和选择区域的局限性。 相似文献
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通过对不同MgO含量烧结矿破碎体的筛上、筛下物分布规律的研究,计算得出了烧结矿粒度分布的分形维数,线性相关系数均大于0.97,说明使用分形维数定量表征烧结矿在不同MgO含量条件下的粒度组成是可行的.结果表明:分形维数随着MgO含量的增加而增加,在一定程度上可以定量估测烧结矿中MgO含量的范围,并结合微观结构,合理解释了转鼓强度、成品率和分形维数之间的关系.为更加深入表达不同MgO含量的烧结矿的有关数值模型提供了新的理论依据和研究方法. 相似文献
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通过对低硅烧结矿破碎体的筛上、筛下物分布规律的研究,计算得出了烧结矿质量分形维数,其值介于2.1~2.6之间,线性相关系数均大于0.97。并且初步获得了烧结矿质量分形维数与烧结矿冷态性能、低温还原粉化性能以及荷重软化性能之间的关系。 相似文献
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采用超音速等离子喷涂和普通大气等离子喷涂制备了微米级氧化钇稳定氧化锆(yttria-stabilized zirconia,YSZ)基热障涂层,使用SprayWatch-2i系统测试喷涂过程中粒子飞行速度及表面温度,通过扫描电镜和图像分析技术表征涂层微观结构,利用压痕法测试了断裂韧性和弹性模量,采用基于分形思想的面积-周长幂率定量表征两种工艺条件下孔隙不规则形态,并研究了分形维数对涂层断裂韧性的影响。结果表明:超音速等离子喷涂和普通大气等离子喷涂YSZ涂层孔隙都具有分形特性;超音速等离子喷涂YSZ涂层分形维数是普通等离子喷涂涂层的1.12倍,孔隙结构更复杂,涂层断裂韧性更高。 相似文献
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GAO Zhi-fang LI Liao-sha WU Zhao-jin SHEN Xing-mei L Hui-hong SU Shi-huai 《钢铁研究学报(英文版)》2013,20(8):27-33
Effects of microwave heating on the pore fractal properties of blast furnace sludge (BFS) and relative mechanism were studied. The results show that the morphology features of iron bearing sinter and coke particles, which arc the main constituents of the BFS, were remarkably changed by microwave heating. The porosity, surface roughness and specific surface area of modified particle surface all increased obviously. Combining with fractal method called Sicrpinski model, the fractal dimensions of sinter, coke and others increased from 2.35, 2. 21 and 2. 58 to 2.65, 2.44 and 2.61 respectively, after modification by microwave heating. The results predicted that the reaction mechanism of microwave heating for BFS is related to two aspects. Different mineral phases existed in BFS particles incline to dissociate each other due to their different microwave absorbability; some recombination or reconstruction of matters or structure leads to structure defects, which have great influences on the surface morphology characteristics and chemical properties. The research indicated that fractal dimension can be used as an effective factor for quantitative analysis of the pore changes in morphology of the sludge. Furthermore, it is helpful for separation and extraction of valuable constituent from BFS. 相似文献
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�����������������Զ��������÷������ 《钢铁研究学报》2013,25(11):6-10
The pore distribution of low silica sinter samples with different C was measured by pressure mercury, and the fractal characteristic of pore distribution was calculated with multifractal theory. With the amount of C increasing, ???? is the least when the mass percent of C is 3. 7%, furthermore, the value of ??f(??) changes from negative to positive in the vicinity 3. 7%, the number of maximum probability element increases relatively, so the sinter has good multiple fractal structure and fractal features. If the amount of C continues increasing, the size of pores will drop, then fractal features will becomes less pronounced. The results also show when the mass percent of C is 3. 7%, its metallurgical properties is optimal. 相似文献