Sintertemetalliske

Sintertemetalliske are a class of materials produced by powder metallurgy in which metal powders are consolidated by sintering to form intermetallic compounds or intermetallic-rich microstructures. These materials exhibit high melting points and high stiffness, along with good high-temperature strength, but frequently display limited plasticity at room temperature.

Production and processing: The powders are blended to achieve the desired alloy composition, compacted into shapes by pressing or additive manufacturing, and sintered at temperatures below the alloy’s melting point in controlled atmospheres. Reactions can occur during sintering to form intermetallic phases; several routes exist, including reactive sintering, mechanical alloying, and spark plasma sintering that promote diffusion and phase formation. Post-sintering operations may include hot isostatic pressing and surface treatment.

Microstructure and properties: Intermetallic phases such as NiAl, TiAl, or FeAl can form ordered lattices. The resulting materials are typically lightweight, with high modulus and creep resistance at elevated temperatures; however, ductility and fracture toughness are often reduced relative to conventional metals. Porosity may be included intentionally for weight reduction or filtration.

Applications: Used in aerospace and automotive sectors for high-temperature components, turbine blades, combustion liners, and wear-resistant parts; also explored for coatings and filters.

Advantages and limitations: Benefits include high-temperature performance, low density, near-net-shape manufacturing, and design flexibility. Limitations include brittleness, processing complexity, and sensitivity to porosity and microstructural defects.

See also: Powder metallurgy, intermetallic compound, sintering, spark plasma sintering.