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THE ROLE OF CHROMIUM MASS TRANSFER IN THE STRUCTURE FORMATION OF (Cu-Sn)-Cr-C MATERIALS DURING LIQUID-PHASE SINTERING
Keywords:
mass transfer, liquid-phase sintering, chromium carbide, mechanical activationDOI:
https://doi.org/10.17654/0973576325045Abstract
The effect of mass transfer of chromium on the structure formation of (Cu-Sn)-Cr-C materials in liquid phase sintering has been studied. For this, mixtures of powders of Cu90Sn10 tin bronze, commercially pure chromium, and graphite were compacted by static pressing. Some powder mixtures were mechanically activated in a ball centrifugal mill before compacting. The samples were sintered in vacuum at 720-920°C for 40-120 minutes. It has been found that the key role in formation of the structure of (Cu-Sn)-Cr-C materials in liquid phase sintering belongs to two processes: mass transfer of chromium via the liquid phase and the formation of chromium carbide. In sintering of mechanically activated (Cu-Sn)-Cr-C powder materials, these processes lead to dissolution of the initial deformed chromium particles and transfer of their substance to nanoparticles of graphite acting as crystallization centers for Cr7C3 chromium carbide. As a result, (Cu-Sn)-Cr-C materials have been obtained consisting of a bronze matrix and uniformly distributed in it Cr7C3 carbide particles, sized 50 to 700 nm.
Received: September 26, 2025
Accepted: November 1, 2025
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