The Effect of Impurity Gas on the Combustion Mode of Granular Mixtures Ti–C–B

IF 0.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2024-07-01 DOI:10.3103/S106138622470002X

D. S. Vasilyev, B. S. Seplyarskii, R. A. Kochetkov, T. G. Lisina, T. G. Akopdzhanyan

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Abstract

Experimental studies of the combustion of granular mixtures (100 – X)(Ti + C) + X(Ti + 2B), 0 ≤ X ≤ 100 wt %, were carried out. Granules 0.6 and 1.7 mm in size were made using an alcoholic solution of polyvinyl butyral. The combustion velocity dependence on X showed two characteristic areas with a boundary between them near X = 60 wt %. At X > 60 wt %, the combustion velocity increased significantly which allowed us to assume a convective mechanism of combustion due to the release of impurity gas. This assumption was verified by experiments in which the impurity gases were filtered through the side surface of samples to exclude the effect of a convective heat transfer. The necessary conditions for the transition to the convective combustion mode were formulated. Calculations showed that the critical conditions were met for mixture 40%(Ti + C) + 60%(Ti + 2B) with granule size of 1.7 mm. The content of impurity gas (presumably hydrogen) for mixtures burning in convective mode was estimated.

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杂质气体对 Ti-C-B 粒状混合物燃烧模式的影响

摘要对颗粒状混合物（100 - X）（Ti + C）+ X（Ti + 2B）（0 ≤ X ≤ 100 wt %）的燃烧进行了实验研究。使用聚乙烯醇缩丁醛的酒精溶液制成 0.6 毫米和 1.7 毫米大小的颗粒。燃烧速度与 X 的关系显示出两个特征区域，在 X = 60 wt % 附近，这两个区域之间有一个边界。在 X > 60 wt % 时，燃烧速度显著增加，因此我们可以假定由于杂质气体的释放而产生了对流燃烧机制。为了排除对流传热的影响，我们通过实验对杂质气体进行了过滤，从而验证了这一假设。实验还提出了过渡到对流燃烧模式的必要条件。计算表明，颗粒尺寸为 1.7 毫米的 40%(Ti + C) + 60%(Ti + 2B) 混合物满足临界条件。估算了以对流模式燃烧的混合物中杂质气体（可能是氢）的含量。

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来源期刊

International Journal of Self-Propagating High-Temperature Synthesis MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

1.00

自引率

33.30%

发文量

期刊介绍： International Journal of Self-Propagating High-Temperature Synthesis is an international journal covering a wide range of topics concerned with self-propagating high-temperature synthesis (SHS), the process for the production of advanced materials based on solid-state combustion utilizing internally generated chemical energy. Subjects range from the fundamentals of SHS processes, chemistry and technology of SHS products and advanced materials to problems concerned with related fields, such as the kinetics and thermodynamics of high-temperature chemical reactions, combustion theory, macroscopic kinetics of nonisothermic processes, etc. The journal is intended to provide a wide-ranging exchange of research results and a better understanding of developmental and innovative trends in SHS science and applications.