The parts are easily have the pores and pin holes in casting and powder metallurgy process. These internal defects will become lasting threats to the part, and may result in the structure failure. For the vacuum infiltration technology, the infiltration agents can be filled into the internal defects under the vacuum conditions.
There are about 21vol% voids inside the compression molded magnet, and these voids usually affect its strength, anti-corrosion property and appearance. Although the epoxy resin has been already cured, but the compression molded magnet will generate a swelling effect after contacted with organic solvent, and the swelling effect will cause the decrease of strength.
The manufacture process of vacuum infiltration compression molded magnet
Universal Testing Machine is widely used in bonded magnet industry to test the ring crush strength. As we can from the testing results, ring crush strength of compression molded magnet only decrease 5% after soaking in alcohol for 1000hrs. The appearance of vacuum infiltration compression molded magnet will be much better than simple non-sealing magnet. Vacuum infiltration technology will guarantee the compression molded magnet work in the organic solvent.
It is worthy to note that the waste water of vacuum infiltration process will highly influence the COD values of water.
