In the automotive construction, as well as in other fields in mechanics, metal matrix composites (MMC) have received considerable interest in the past years, especially in the technology of production. In addition to elaboration techniques for bulk components (squeeze casting), new manufactoring routes are developped for the production of MMC coatings. In the present work, the possibilities of spray-casting by using high power laser are demonstrated and Ni-base particulate MMC are produced at the surface of different alloys: Fe- or Cu-base alloys. Both metallic and carbide powders are fed continuously into the laser beam, where they are heated (metallic elements are melted) and propelled at high velocity onto a workpiece. After solidification, metallic elements constitute the matrix of MMC, while carbide particles act as reinforcing component. MMC Features are nearly independent on the composition of the substrate and suitable processing conditions are also very similar. Mechanical properties (hardness, Young modulus, flow stress) are good, confirming therefore that laser cladding is a promising primary manufactoring route, which could act as wear resistant layers.
Metal matrix composite coatings on various materials: improvement of mechanical and tribological properties of automotive parts
Beschichtung verschiedener Metalle mit Verbundwerkstoffen mit Metallmatrix: Verbesserung mechanischer und tribologischer Eigenschaften von Kraftfahrzeugteilen
1994
8 Seiten, 4 Bilder, 3 Tabellen, 8 Quellen
Aufsatz (Konferenz)
Englisch
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