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4. Spray coating of CMMp
This technique involves spraying droplets of liquid or semi-liquid composite onto a substrate to be coated with CMMp, where they solidify. The droplets are formed by atomization using a gas, liquid or plasma.
Among the main advantages of atomization are the low impact temperature and high solidification speed, which limit metal grain growth, the absence of surface oxidation and, above all, the possibility of obtaining parts with their final shape, close to the dimensions. What's more, composites of varying volume fractions can be produced, even with highly reactive matrices.
4.1 Projection-atomization
It's a process that has developed recently and seems to have a very promising future, as it...
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Metal manufacturing processes and recycling
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Spray coating of CMMp
Obtaining CMMp from a semi-liquid matrix
Costs
Today, the cost of reinforcing particles is highly variable, with a downward trend in prices. For example, a pound (= 0.454 kg) of particles can vary from 2 to 40 Canadian dollars, depending on the nature and size of the particles, whereas a pound of processed aluminum (finished parts) used to cost only 1 to 2 dollars, depending on the alloy and, above all, the quantity. We need to keep a close eye on the price of aluminum, which...
References
Standardization
American National Standards Institute (ANSI)
- Normalisation des composites à matrice métallique - ANSI H 35.5 - – 1,992
- Test method for measuring abrasion using the dry sand/rubber wheel apparatus - G 65-91 -
American Society for Testing and Materials (ASTM)
Producers
There are several producers of CMMp particle-reinforced metal matrix composites in the world . Duralcan is the most important in terms of production volume, with around 11,000 t/year, and probably also in terms of research efforts. DWA, Cospray (500 t/year), BP...
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