SmCosintermagneten

SmCosintermagneten is a class of permanent magnets based on samarium-cobalt intermetallic alloys produced by powder sintering. The term is used in various catalogs and literature to denote sintered Sm–Co magnets, typically engineered to maximize coercivity and thermal stability. The most common stoichiometries are SmCo5 and Sm2Co17, though other compositions and microstructures have been developed to tailor magnetic performance. These magnets are categorized as rare-earth transition-metal magnets and are known for their high temperature stability and resistance to demagnetization compared with many other magnet families.

Structure and composition: SmCosintermagneten magnets contain hard magnetic intermetallic phases, primarily SmCo5 and Sm2Co17, which can exist in single-phase or multi-phase microstructures. Micro-alloying with elements such as copper, iron, or zirconium is sometimes used to improve grain boundary characteristics, coercivity, and thermal stability. The crystallography of the SmCo phases gives the material a strong uniaxial magnetic anisotropy, contributing to high performance at elevated temperatures.

Synthesis: Production generally relies on powder metallurgy. Sm–Co alloy powders are produced, milled, and aligned in a magnetic field before being pressed into shapes and sintered at high temperatures. Post-sinter heat treatment optimizes phase balance, grain size, and magnetic properties, and the magnets may be machined into finished parts afterward.

Properties and applications: SmCosintermagneten magnets offer high energy products, exceptional thermal stability, and good corrosion resistance. They remain magnetically robust at elevated temperatures and are resistant to degradation in demanding environments. Drawbacks include brittleness and sensitivity to mechanical impact. They are widely used in aerospace, defense, automotive, and other applications requiring reliable performance in high-temperature conditions. See also SmCo magnets, SmCo5, and Sm2Co17.