Influence of Mechanical Activation and Impurity Gas Release on the Macrokinetics of Combustion and the Product Structure in the Ti–C–B System for Pressed Compacts and Granulated Mixtures
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Abstract
The influence of mechanical activation (MA) of the (100 – x)(Ti + C) + x(Ti + 2B) system on the characteristics of combustion of samples with different macrostructures—pressed compacts with a relative density of 0.53–0.6 and bulk density granules 0.6–1.6 mm in size—is studied. It is found that MA of powders leads to a gradual decrease in the combustion rate of pressed samples as the Ti + 2B content in the mixtures increases (a descending dependence), while an increase in the Ti + 2B content in compacts of nonactivated powders leads to an increase in the combustion rate (an ascending dependence). The obtained results contradict the theoretical ideas about the influence of MA on the combustion process, according to which the combustion rate should increase. One of the important factors influencing the change in the combustion rate is the release of impurity gases (IGs). For the first time, the influence of MA on the combustion patterns of granular mixtures is experimentally determined. It is found that the burning rates of granular mixtures are higher than those of powder mixtures for all the compositions studied. It is shown that granulated mixtures from an activated powder have a combustion rate that is on average 3 times higher than granules from a nonactivated powder, and the dependence of the combustion rate on the mass content of Ti + 2B has a local minimum, which is probably related to the peculiarities of the MA process.
摘要 研究了 (100 - x)(Ti + C) + x(Ti + 2B) 体系的机械活化（MA）对不同宏观结构样品（相对密度为 0.53-0.6 的压制样品和体积密度为 0.6-1.6 毫米的颗粒）燃烧特性的影响。研究发现，随着混合物中 Ti + 2B 含量的增加，粉末的 MA 会导致压制样品的燃烧速率逐渐降低（递减关系），而非活化粉末压制物中 Ti + 2B 含量的增加会导致燃烧速率的增加（递增关系）。所得结果与 MA 对燃烧过程影响的理论观点相矛盾，后者认为燃烧速率应该增加。影响燃烧速率变化的重要因素之一是杂质气体（IGs）的释放。我们首次通过实验确定了 MA 对颗粒混合物燃烧模式的影响。研究发现，在所有研究成分中，颗粒混合物的燃烧速率均高于粉末混合物。结果表明，活化粉末颗粒混合物的燃烧速率平均是未活化粉末颗粒的 3 倍，而且燃烧速率与 Ti + 2B 质量含量的关系有一个局部最小值，这可能与 MA 过程的特殊性有关。
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.
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