首页|Interaction of Titanium Diboride with Nickel and Ni-20% Cr Alloy (Nichrome)
Interaction of Titanium Diboride with Nickel and Ni-20% Cr Alloy (Nichrome)
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NSTL
Springer Nature
The interaction in the Ni-Ti-B and Ni-Ti-B-Cr systems along the Ni-TiB2 and (Ni-20% Cr)-TiB2 sections was studied. Solid-phase interaction was not found to occur for Ni-TiB2 up to 1200 degrees C. In the case of (Ni-20% Cr)-TiB2, a new phase was formed, Cr2B, with a thickness of similar to 5 mu m at a temperature of 1200 degrees C. The contact melting began above 1200 degrees C in the Ni-TiB2 system and above 1180 degrees C in the (Ni-20% Cr)-TiB2 system. In the (Ni-20% Cr)-TiB2 system, the emerged liquid wetted titanium diboride with an angle of 50 degrees; when temperature increased to 1450 degrees C, the liquid spread completely on the TiB2 surface. In the contact melting process, several areas formed: titanium diboride area, Ni3B and TiB area, Ni and TiB area, and pure nickel. The systems were eutectic and their quasibinary phase diagrams had a eutectic at similar to 9% TiB2 with a melting point of similar to 1200 degrees C at the Ni-TiB2 section and a melting point of similar to 1180 degrees C at the (Ni-20% Cr)-TiB2 section. The alloys in the hypoeutectic part of the phase diagram consisted of the Ni, Ni3B, and TiB phases and additionally of the Cr2B phase in the (Ni-20% Cr)-TiB2 system. In the hypereutectic part of the phase diagram, the metal component disappeared and unreacted TiB2 additionally appeared in the (Ni-20% Cr)-TiB2 system. Zero solid-phase interaction and contact melting observed at temperatures of 1200 and 1180 degrees C, which were significantly lower than the melting points of the interacting components (Ni, Ni-Cr), promoted favorable conditions for the use of nickel as a metal component in wear-resistant composites produced from granular titanium diboride, capable of operating under dynamic and shock loads at elevated temperatures (similar to 900 degrees C) and in corrosive environments.
NSTL
Springer Nature
