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Powder metallurgy economy, particularity and nature

Industry Information
2017/09/25 17:34
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Energy saving: the pressure required for powder molding is much lower than that of forging and rolling. The sintering temperature is lower than the melting point of the main component. So the 
Energy saving: the pressure required for powder molding is much lower than that of forging and rolling. The sintering temperature is lower than the melting point of the main component. So the energy consumption is far lower than the casting, machining and other processes.
Material: powder metallurgy method of material utilization up to 95% or more, much higher than other processes. For example, the mechanical utilization of materials, the average utilization rate of only between 40 ~ 50%.
Time-saving: in the automated production line, forming a raw embryo can be as low as 0.5 seconds; and each finished the cost of the average sintering time can be as low as several seconds. Its time cost is far lower than other processes.
Accuracy: powder metallurgy products of high dimensional accuracy, in general use, almost no follow-up processing
Particularity on
Some materials, although possible in other ways, in practice, there are considerable difficulties, such as:
High melting point metal: tungsten (3380 ℃), molybdenum (2615 ℃), ceramics and other high melting point material is difficult to melt casting.
Active metal: titanium, tantalum and other metals in the molten state of the high activity, easy to oxidize or erosion crucible, casting a considerable difficulty. So much to powder metallurgy manufacturing.
Some products with unique properties or microstructures can not be obtained in other processes except for powder metallurgy processes. E.g:
Porous materials: filters, oil-bearing, breathable steel and so on
Composites: Diffusively reinforced or fiber reinforced composites
Alloy system: most of the alloy system has a solid solution limit, beyond this limit, the casting organization will produce eutectic, eutectoid, or intermetallic compounds and other segregation phenomenon, the formation of uneven organizational structure; and some elements even if In the molten state is not miscible, it is impossible to manufacture by casting. The characteristics of the powder metallurgy method makes it easy to deploy any ratio and the organization of the alloy material (because of its process does not reach the melting point).