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首页> 外文OA文献 >In situ X-ray Diffraction Investigation of the Formation Mechanisms of Silico-Ferrite of Calcium and Aluminium-I-type (SFCA-I-type) Complex Calcium Ferrites.
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In situ X-ray Diffraction Investigation of the Formation Mechanisms of Silico-Ferrite of Calcium and Aluminium-I-type (SFCA-I-type) Complex Calcium Ferrites.

机译：钙硅铝氧体和铝-I型（SFCA-I型）复合钙铁氧体形成机理的原位X射线衍射研究。

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The formation mechanisms of the complex Ca-rich ferrite phase SFCA-I, an important bonding material in iron ore sinter, during heating of synthetic sinter mixtures in the temperature range 298-1623 K in air and at pO(2) = 5 x 10(-3) atm, were determined using in situ X-ray powder diffraction. In air, the initial formation of SFCA-I at similar to 1438 K (depending on composition) was associated with reaction of precursor phases Fe2O3, CaO center dot Fe2O3, SiO2, amorphous AI-oxide and a CFA phase of approximate composition 71.7 mass% Fe2O3, 12.9 mass% CaO, 0.3 mass% SiO2 and 15.1 mass% Al2O3. At temperatures above similar to 1453 K, the decomposition of another phase, gamma-CFF, resulted in the formation of additional SFCA-I. At lower oxygen partial pressure the initial formation of SFCA-I occurred at similar temperatures and was associated with reaction between similar phases as its formation in air. However, the decomposition of gamma-CFF did not result in the formation of additional SFCA-I, with the maximum SFCA-I concentration (25 mass%) lower than the values attained in air (54 and 34 mass%). Hence, more oxidising conditions appear to favour the formation of the desirable SFCA-I phase. Copyright © The Iron and Steel Institute of Japan 2013.
机译：在空气中和在pO（2）= 5 x 10的温度范围内加热298-1623 K的合成烧结混合物期间，复杂的富钙铁素体相SFCA-I（铁矿石烧结中的重要粘结材料）的形成机理（-3）atm是使用原位X射线粉末衍射法测定的。在空气中，类似于1438 K（取决于成分）的SFCA-1初始形成与前驱物相Fe2O3，CaO中心点Fe2O3，SiO2，无定形AI-氧化物和约71.7质量％CFA相的反应有关Fe 2 O 3，12.9质量％的CaO，0.3质量％的SiO 2和15.1质量％的Al 2 O 3。在高于1453 K的温度下，另一种相gamma-CFF的分解导致形成额外的SFCA-1。在较低的氧分压下，SFCA-1的初始形成发生在相似的温度下，并且与在空气中形成相似相之间的反应有关。但是，γ-CFF的分解不会导致形成额外的SFCA-1，最大SFCA-1浓度（25质量％）低于在空气中达到的值（54和34质量％）。因此，更多的氧化条件似乎有利于所需的SFCA-1相的形成。版权所有©日本钢铁学会2013。

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