Abstract
In order to improve wear resistance of white cast iron, cermet powder layer only and cermet powder layer mixed with some metallic powder were inserted by molten 27 mass% Cr white cast iron at 1773K. Various sizes of the cermet powder were adopted for the insertation. The microstructure of surface and vertical cross-section of the inserted layer was examined to investigate castability of the molten cast iron for these powder layer. The results obtained are as follows. (1) For the cermet powder size of more than 3.4mm, the inserted layer shows satisfactory metallographic structure. (2) For the cermet powder size of less than 3.4mm, many voids are located in the inserted layer and cermet powder remain, but good metallographic structure is obtaind by the addition of Ni powder or Cr powder. (3) For the mixed cermet powder added 50 vol.% Ni powder, a compression method to make a compact is available to obtain a good microstructure of inserted layer. (4) A suspension method for the cermet powder in the mold is also effective to obtain the good microstructure because it is easy to obtain a good admission of the molten cast iron into the cermet powder.
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