2. Obtaining CMMp by powder metallurgy

2.1 General process

This is an interesting type of process, which can produce materials (alloys and/or composites) with non-equilibrium compositions and very high particle volume fractions [15] . When conventional powder metallurgy (PM) techniques are used, manufacturing costs are acceptable. A few industries produce CMMp parts by MP such as DWA, Advanced Composite Materials Corp. (ACMC), or Aerospace Corp. which obtains parts with a NiAl ₃ intermetallic matrix and alumina reinforcement particles. The latter materials are mainly intended for turbine blades or as constituents of aircraft engine combustion chambers. Westinghouse uses hot isostatic pressing of several parts...

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Obtaining CMMp by powder metallurgy

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page Metal matrix composites

Obtaining CMMp from a 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

(1) - BUNSELL (A.), GOROG (M.) - Matériaux et Techniques, p. 27-30, sept. 1989.
(2) - - Materials Engineering, p. 18-27, oct. 1990.
(3) - VACCARI (J.A.) - American Machinist, p. 42‐46,...

Standardization

American National Standards Institute (ANSI)

Normalisation des composites à matrice métallique - ANSI H 35.5 - – 1,992

American Society for Testing and Materials (ASTM)

Test method for measuring abrasion using the dry sand/rubber wheel apparatus - G 65-91 -

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...