Synthesis of TiB2 powder from a mixture of TiN and amorphous boron

Matsudaira, Tsuneaki; Itoh, Hideaki; Naka, Shigeharu; Hamamoto, Hiroshi; Obayashi, Mikio

doi:10.1007/bf01174067

Cited by 10 publications

(2 citation statements)

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“…In the above context, it is interesting to discuss results obtained by Matsudaira from the reaction sintering of the TiN−B system. 12 Employing a 1:2 molar ratio for submicron powder mixtures of TiN and B, the previous study reported the formation of solely TiB 2 under long-term (0−6 h) sintering conditions (1300−1800 K) and inert atmospheres. However, they reported that no reaction occurred under a nitrogen atmosphere.…”

Section: Additional Experimentsmentioning

confidence: 99%

“…9−11 A high-pressure polymorph of BN, cubic BN, possesses mechanical properties comparable to those of diamond. This reactive system was used in the reactive sintering mode by Matsudaira et al 12 to produce a TiB 2 -rich ceramic powder. The combustion synthesis routes in this system were also investigated by Manukyan et al 13 Their conclusion was that the reaction is not exothermic enough and allows the selfsustained regime of propagation only after chemical activation, i.e., addition of pure Ti to the system or conducting the reaction in a nitrogen atmosphere with excess boron, both of which increase the total heat release either due to the reaction of Ti with excess B to form TiB 2 or due to N 2 gas reacting with B to form BN.…”

Section: Introductionmentioning

confidence: 99%

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Mechanisms of Self-Sustained Reaction in Mechanically Induced Nanocomposites: Titanium Nitride and Boron

2019

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We report the results from the investigation of the mechanisms of self-sustained reaction in mechanically induced TiN/B nanocomposites. The exothermic displacement reaction, 3B + TiN → BN + TiB2, with an adiabatic reaction temperature of 1905 K, was initiated through two different means: localized thermal heating and mechanical stimulation by high-energy ball milling. Comprehensive studies strongly indicate that the chemical interaction in the system involves three main stages. Solid-state mass transfer, likely the substitutional diffusion of B into a nitrogen deficient TiN x crystal lattice, is responsible for the formation of TiB2 during the first stage of the reaction (1350–1500 K) under ambient pressure. Thermal gravimetric analysis coupled with mass spectrometry demonstrated the evolution of gas phase nitrogen from TiN during an intermediate stage of the reaction in the temperature range of 1500–1800 K. Electron microscopy results show the formation of h-BN along the pores present in the initial composite, thus indicating reaction of gaseous nitrogen with boron during the final reaction stage. In addition, propagation characteristics of an oscillatory spin combustion regime in the TiN–3B system were analyzed using high-speed infrared imaging, which suggest a strongly nonlinear spin combustion mode.

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Section: Additional Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%