Effect of Alumina on the Expantion of Aluminum-Alumina Reaction Sintering.

In the reaction sintering of aluminum-alumina green compact in air, size change (expansion) due to the direct oxidization of the aluminium has been observed. The expansion amount of the compact is not equal (smaller than) to the shrinkage of the slurry cast. But it has been made to correspond by changing the size distribution of the alumina powder, so that the binder amount decrease, the initial fillings improve, the shrinkage decrease, and as aresult the expansion amount increase). It was also confirmed that the deviaton of dencity can be reduced by adding alumina fiber.