Abstract
Migration of crystal grains in liquid alloy during solidification by dental-centrifugal and gaspressure casting processes was investigated.
Distribution of crystal grains in cast structure and solidification time were measured, and moving velocity of crystal grain in liquid alloy was calculated.
The results confirmed that solidification of alloy by dental-centrifugal casting process is dependent on the migration and accumulation of crystal grains in the liquid alloy caused by centrifugal force, that distribution of crystal grains in cast structure is strongly dependent on the rotational speed of the arm of cast machine for one second from the beginning of cast. Solidification of alloy in cast using full crown-like molds is also identical. In gas-pressure casting process, migration of crystal in the liquid alloy caused by gravity does not occurred.
