Formation of dense Ti-B-Fe system product obtained by self-propagating high-temperature synthesis

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The possibility of obtaining a dense material of the Ti-B-Fe system in one stage during self-propagating high-temperature synthesis is studied. The influence of some process parameters on the densification of reaction products of the Ti-B-Fe system, which has high physical and mechanical characteristics, is studied. The maximum temperature developed in the combustion wave, using ferroboron alloys as initial reagents, annealing of initial powders, and preheating of the charge before self-propagating high-temperature synthesis are established to have the greatest influence on the formation of a nonporous product during the combustion of the Ti-B-Fe system.

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Sobre autores

O. Lepakovа

Tomsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences

Email: O.Shkoda@dsm.tsc.ru
Rússia, Tomsk

O. Shkoda

Tomsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: O.Shkoda@dsm.tsc.ru
Rússia, Tomsk

B. Braverman

Tomsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences

Email: O.Shkoda@dsm.tsc.ru
Rússia, Tomsk

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2. Fig. 1. Polythermal section of Fe-TiB₂ of the Fe-B-Ti system.

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3. Fig. 2. Dependences of the maximum combustion temperatures of the Ti-B-Fe system on the iron content in the mixtures: 1 – Fe, B, Ti; 2 – FeBn-Ti combined with the solidus-liquidus line of the TiB₂ + Fe phase diagram.

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4. Fig. 3. Dependences of the residual porosity of the final products (h) on the maximum combustion temperature (a) and on the TiB₂ content in the final products (b): 1 – mixture of Ti, B, Fe powders, 2 – mixture of ferroboron alloys with titanium.

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5. Fig. 4. Dependences of the residual porosity of the final products (η) on the preheating temperature of the mixture of ferroboron alloy with titanium (FeB₂ + Ti): 1 – unannealed mixture, 2 – annealed mixture at Тann = 600°C, 2 h.

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6. Fig. 5. Photographs of macrostructures of samples with low (≈5%) (a) and high (≈16%) (b) residual porosity of final products after SHS with preheating at 400 (a) and 900°C (b) of a mixture of ferroboron alloy with titanium (FeB₂ + Ti).

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7. Fig. 6. Microstructure of a sample with low residual porosity (≈5%). Light areas are TiB₂ grains, gray areas are TiB₂ + Fe eutectic

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8. Fig. 7. Distribution of pores (r) by size in the final products of the FeB₂ + Ti mixture: 1 – the initial mixture was annealed at T = 600°C, 2 h, 2 – the initial mixture was not annealed.

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9. Fig. 8. Dependences of the residual porosity of the final product of the Ti-B-Fe system on the dispersion of the initial titanium powder in mixtures: 1 – FeB₆ + 3Ti, 2 – Fe + 6B + 3Ti, 3 – Fe + 4B + 2Ti, 4 – FeB₄ + 2Ti, 5 – Fe + 2B + Ti, 6 – FeB₂ + Ti.

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