Coated Metal Powder, Sintering Behaviour and Application in alternative Forming Processes

摘要

Coated powders can be produced by methods, which are commonly used for surface coating of metals and non-metals. The advantages of coated powders are excellent sintering behaviour, uniformity of combination, and exactness of the part dimensions and uniformity of properties of the sintered components. The special geometrical relationships in such powders especially the great interface between the combined materials enhance the densification. The outstanding sintering properties favours coated powders for processes, which start with low green density (slurry, direct consolidation) and need high densification rates to reach the sufficient density of the final components. In most cases liquid phase sintering takes place and the shape stability is an important fact. For other purposes if fast densification is needed for instance by particle repacking (laser sintering) the coated powders seems best suited.