lsostatic Pressing
Isostatic pressing is a powder processing technique characteristic in the use of fluid pressure in order to compact the part Metal powders are placed in a flexible container.This sealed container is the mold for the part.Fluid pressure is exerted over the entire outside surface of the container causing the container to press and form the powder into the correct geometry. Most processes exert forces on the powder through an axis. lsostatic pressing is special in its use of all around pressure. The all around pressure exerted by the fluid during isostatic pressing manufacture,provides uniform compaction of the powder and uniform density within the compacted part.Density variation within the compact is a major concern of conventional processing particularly with certain parts. lsostatic pressing is commonly used over conventional metallurgica techniques to produce parts that are larger have high thickness to diameter ratios, or for superior material properties.Isostatic pressing tends to have long cycle times and is best utilized for short production runs.
Cold Isostatic Pressing
Cold isostatic pressing(CIP),is performed at room temperature and uses a mold made from an elastomer material such a sure thane rubber or polyvinyl chloride. The fluid in cold isostatic pressing is usually oil or water. Fluid pressure during the operation is typically from 60,000 lbs/in(400MPato15000bs/in(1000MPa.A disadvantage to this manufacturing process is a low geometric accuracy because of the flexible mold. First the powder is compacted to a very uniform density by cold isostatic pressing.Then the green compact is usually sintered conventionallyto produce the desired part.
