Das Dreistoffsystem Nickel-Bor-Silicium

The ternary system Nickel-Boron-Silicon was established at 850°C by means of X-ray diffraction, metallographic and micro-hardness examinations. The well known binary nickel borides and silicides resp. were confirmed. In the boron-silicon system two binary phases, SiB_4-x withx≈0.7 and SiB₆ were found the latter in equilibrium with the β-rhombohedral boron. Confirming the two ternary silicon borides a greater homogeneity range was found for Ni₆Si₂B, the phase Ni_4,6Si₂B published byUraz andRundqvist can better be described by the formula Ni_4.29Si₂B_1.43. In relation to further investigations we measured melting temperatures in ternary Ni-10 B?Si alloys by differential thermoanalysis.