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

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

The influence of mechanical activation of the system 100−x(Ti+C)+x(Ti+2B) on the character of combustion of samples with different macrostructure: pressed compacts with relative density of 0.53-0.6 and bulk density granules of 0.6–1.6 mm size has been investigated. It was found that mechanical activation of powders leads to a gradual decrease in the combustion rate of pressed samples with increasing Ti+2B content in the mixtures (a descending dependence), and increasing Ti+2B content in compacts from nonactivated powders leads to an increase in the combustion rate (an ascending dependence). The obtained results contradict the theoretical ideas about the influence of mechanical activation 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. For the first time the influence of mechanical activation on the character of combustion of granular mixtures was experimentally determined. It was found that the combustion rates of granular mixtures are higher than those of powder mixtures for all the compositions studied. It is shown that granulated mixtures from activated powder have a combustion rate on average 3 times higher compared to granules from 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 mechanical activation process.

Толық мәтін

Рұқсат жабық

Авторлар туралы

D. Vasilyev

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: d.s.vasilyev@mail.ru
Ресей, Chernogolovka

B. Seplyarskii

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences

Email: seplb1@mail.ru
Ресей, Chernogolovka

N. Kochetov

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences

Email: d.s.vasilyev@mail.ru
Ресей, Chernogolovka

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2. Fig. 1. Schematic diagram of the experimental setup: 1 – argon cylinder, 2 – argon flow sensors, 3 – gas pressure sensors, 4 – gas switch (I – nitrogen, II – argon, III – supply shut off), 5 – tungsten spiral, 6 – charge, 7 – substrate, 8 – digital video camera, 9 – personal computer for recording data from sensors and video camera.

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3. Fig. 2. Dependence of the combustion rate of pressed compacts on the mass content of Ti+2B before (1) and after MA (2).

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4. Fig. 3. Typical X-ray diffraction patterns of combustion products: 1 – (Ti+C), 2 – 20(Ti+2B), 3 – 40(Ti+2B), 4 – 60(Ti+2B), 5 – 80(Ti+2B), 6 – (Ti+2B).

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5. Fig. 4. SEM images of the original titanium powder (a) and the MA mixture of composition 60(Ti+2B) (b, c).

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6. Fig. 5. X-ray diffraction patterns of products of the composition (Ti+2B) after MA for 5 min (1) of the combustion product of a pressed sample (Ti+2B) from an unactivated batch (2), and of the combustion product of a granulated sample (Ti+2B) from an unactivated batch (3).

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7. Fig. 6. a – Combustion products of pressed compacts from the initial mixtures: 1 – (Ti+C), 2 – 20(Ti+2B), 3 – 40(Ti+2B), 4 – 60(Ti+2B), 5 – 80(Ti+2B), 6 –(Ti+2B); b – combustion products of pressed compacts from MA mixtures: 1 – (Ti+C), 2 – 20(Ti+2B), 3 – 40(Ti+2B), 4 – 60(Ti+2B), 5 – 80(Ti+2B).

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8. Fig. 7. Dependence of the combustion rate of granulated mixtures on the mass content of Ti+2B before (1) and after MA (2).

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9. Fig. 8. a – Combustion products of granulated samples from non-activated mixtures: 1 – (Ti+C), 2 – 20(Ti+2B), 3 – 40(Ti+2B), 4 – 60(Ti+2B), 5 – 80(Ti+2B), 6 – (Ti+2B); b – from activated mixtures: 1 – (Ti+C), 2 – 20(Ti+2B), 3 – 40(Ti+2B), 4 – 60(Ti+2B), 5 – 80(Ti+2B), 6 – 90(Ti+2B)

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