Thermal stability of finely dispersed ferromagnetic powders

The oxidation mechanism and kinetics have been examined for finely disperse d powders of iron and compounds containing it and noble and platinum metals ; these powders were made by a thermochemical method and examined at 20-400 degreesC. The powders do not change in composition and magnetic characteri stics up to 110 degreesC because the surfaces of the particles are protecte d by iron oxides and carbide. This allows the powders to be used to make ma terials for medical purposes, since they can be sterilized at that temperat ure.