Osamu Odawara1 and Jun Ikeuchi1
1Government Industrial Research Institute, Tohoku, Sendai
A ``centrifugal-thermit process'' is mainly characterized by a large amount of the reaction heat and the centrifugal force applied to the reaction products. Therefore, it is important to investigate the influence of these effects on the production of composite pipes and to assess the potential and limitation of the centrifugal-thermit process.
In the present work, the effect of centrifugal force is investigated in order to determine optimum conditions for producing good metal-ceramic composite pipes. Production tests under various values of centrifugal force are performed with a thermit mixture of Fe3O4 and Al system. The producd composite pipes are evaluated by measuring mechanical properties through a squeezing test, a compression-shear test, a thermal shock test etc.
With the increase of the centrifugal force, the compressive strength and the density of the products are improved. The compression-shear stress and thermal shock resistance are not necessarily improved. The metal and ceramic layers are uniformly partitioned, and a dense ceramic layer is obtained under the centrifugal force of 208 G. However, small cracks are observed in the ceramic layer.
As a result of the present work, it is confirmed that the optimum effect of centrifugal force would be exhibited in the region from 55 G to 208 G.
centrifugal-thermit process, thermit reaction, centrifugal force, metal-ceramic composite pipes, ceramic lining, corundum
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