Calculations of chemical equilibria in the Mo-B-N system

  • Benko E
  • Wyczesany A
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Abstract

Calculations of chemical equilibria for the Mo-B-N system using the VCS algorithm were carried out for the 30-1727??C temperature range and the 1??3 ?? 10-3-1 ?? 107 Pa pressure range. Two BN: Mo molar ratios were selected: 1 : 1 and 2 : 1. It follows from these studies that Mo can react with BN in a very wide range of temperatures and pressures, giving new phases, namely Mo2B, MoB, MoB2, Mo2B5 and MoB4. The formation of these phases is strongly influenced by pressure-temperature parameters. In order to verify theoretical calculations by experiment equimolar and 2 : 1 BN : Mo batches were prepared and heated at 1427??C in vacuum and in argon atmosphere. Phase identification carried out by X-ray diffraction fully corroborated the computational results. ?? 1994.

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Authors

  • Ewa Benko

  • Andrzej Wyczesany

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