Conductive and Convective Combustion Modes of Granular Mixtures of Ti–C–NiCr

IF 1.4 4区化学 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Russian Journal of Physical Chemistry B Pub Date : 2024-09-11 DOI:10.1134/s1990793124700404

B. S. Seplyarskii, R. A. Kochetkov, T. G. Lisina, N. I. Abzalov

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Abstract

The combustion modes of powder and granular mixtures (100 – X)(Ti + C) + XNiCr (X = 0–30%) containing Ti powders of different dispersion with different amounts of impurity gases in them are studied. The experimental setup provided the filtration of impurity gases released during combustion in the cocurrent direction or through the side surface of the sample. The difference between the experimental burning velocities of powder mixtures with titanium of a different fineness is explained using a convective-conductive combustion model. For granular mixtures based on Ti powder with a characteristic size of 120 μm, it is shown that combustion occurs in the conductive mode. Comparison of the combustion velocities of granular mixtures containing Ti powder with particles of a characteristic size of 60 μm in the absence and presence of gas filtration through the sample indicates the transition of combustion to the convective regime. The necessary and sufficient conditions for the transition from conductive to convective combustion are formulated, which makes it possible to determine the composition of the mixture whose combustion occurs in the boundary region. In mixtures based on Ti with a particle size of 60 μm, the conductive combustion regime is observed during the combustion of granules 0.6 mm in size and a mixture with X = 30% of granules 1.7 mm in size. For mixtures with X = 0–20% with granules 1.7 mm in size, burning in the convective regime, the interfacial heat transfer coefficients are evaluated using the experimental data. Their values are more than an order of magnitude higher than the theoretical ones. The XRD results of the combustion products showed that in order to obtain synthesis products without side phases of intermetallic compounds, it is necessary to use finely dispersed titanium powder.

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钛-碳-镍铬颗粒混合物的传导和对流燃烧模式

摘要研究了粉末和颗粒混合物 (100 - X)(Ti + C) + XNiCr (X = 0-30%)的燃烧模式，这些混合物含有不同分散度的 Ti 粉末和不同数量的杂质气体。实验装置可过滤燃烧过程中顺流方向或通过样品侧表面释放的杂质气体。使用对流-传导燃烧模型解释了不同细度钛粉末混合物实验燃烧速度之间的差异。对于基于特征尺寸为 120 μm 的钛粉的颗粒混合物，研究表明燃烧发生在传导模式下。比较了含有特征粒度为 60 μm 的钛粉颗粒的颗粒混合物在没有和有气体过滤通过样品的情况下的燃烧速度，结果表明燃烧过渡到了对流状态。我们提出了从传导燃烧过渡到对流燃烧的必要条件和充分条件，从而可以确定在边界区域发生燃烧的混合物的成分。在以粒径为 60 μm 的钛为基础的混合物中，粒径为 0.6 mm 的颗粒和粒径为 1.7 mm 的颗粒占 X = 30% 的混合物在燃烧过程中会出现传导燃烧。对于 X = 0-20% 的颗粒大小为 1.7 毫米的混合物，在对流状态下燃烧时，利用实验数据评估了界面传热系数。其值比理论值高出一个数量级以上。燃烧产物的 XRD 结果表明，为了获得没有金属间化合物副相的合成产物，必须使用精细分散的钛粉。

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来源期刊

Russian Journal of Physical Chemistry B 化学-物理：原子、分子和化学物理

CiteScore

2.20

自引率

71.40%

发文量

106

审稿时长

4-8 weeks

期刊介绍： Russian Journal of Physical Chemistry B: Focus on Physics is a journal that publishes studies in the following areas: elementary physical and chemical processes; structure of chemical compounds, reactivity, effect of external field and environment on chemical transformations; molecular dynamics and molecular organization; dynamics and kinetics of photoand radiation-induced processes; mechanism of chemical reactions in gas and condensed phases and at interfaces; chain and thermal processes of ignition, combustion and detonation in gases, two-phase and condensed systems; shock waves; new physical methods of examining chemical reactions; and biological processes in chemical physics.