compact powder
4.Firstly, the technique of laser sintering has been studied, while keeping focus diameter 8.5mm, thickness of compact 0.7~1.0mm and constant flow of Ar gas, the results showed as follows: (1) During laser sintering, the bronze-Ti powder is oxidized most easily and plenty of residua and lump is observed.
6.Pellet sample is wrapped up by coal powder and reduced directly in solid state When the reduction finished, carbonization will take place due to the close contact between the hot DRI and coal powder, which results that the surface of hot DRI melted and formed a layer of compact metallic shell This shell can protect hot DRI from re oxidization at high temperature in the air

