5. Obtaining CMMp from a semi-liquid matrix
This set of processes is mainly used on a laboratory scale. Although good temperature control is required, there are a few industries that produce CMMp from the semi-liquid or paste state. The principle of shaping between liquidus and solidus was first studied at MIT (Massachusetts Institute of Technology) by Professor Flemings, in the early 60s.
The principle of paste stirring is shown in figure 24 . The furnace maintains the alloy in a semi-liquid phase, which presupposes good temperature control. As the particles are incorporated, a mechanical agitator stirs the mixture vigorously. This stirring has multiple effects: it prevents the formation of dendrites, homogenizes the temperature and modifies the composition...
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Obtaining CMMp from a semi-liquid matrix
Solid state manufacturing
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...
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