Ni-Mo-BおよびNi-W-B系の1223 Kにおける相関係

抄録

The phase relationships in the Ni-Mo-B and Ni-W-B systems at 1223 K have been determined over the whole ranges of composition by chemical and X-ray diffraction analyses and optical microscopy. In the Ni-Mo-B system, five ternary phases of two known compounds, NiMo₂B₂ and NiMo₃B₃, and three new compounds, Ni₁₀Mo₃B₁₁, Ni₂₀MoB₁₇ and Ni₂₃Mo₄B₂₉ appeared. The lattice parameters are a=0.6197, b=1.0737, c=0.3021 nm for Ni₁₀Mo₃B₁₁; a=0.7553, b=1.3088, c=0.2985 nm for Ni₂₀MoB₁₇; a=0.8750, b=0.9393, c=0.3074 nm for Ni₂₃Mo₄B₂₉. MoB₁₂ is orthorhombic with a=0.6341, b=0.9083 and c=0.5203 nm. In the Ni-W-B system, two phases of a known compound, NiW₂B₂, and a new compound, Ni₂₀WB₁₇ appeared. Another known compound, NiW₃B₃ decomposed below about 1600 K. The lattice parameters of Ni₂₀WB₁₇ are a=0.7567, b=1.3099 and c=0.2983 nm.