Magnetic grain size

The magnetic properties are described as a function of magnetic grain sizes and shapes different possible states such as ferromagnetic, superpara-magnetic and cluster glass as well as transition between them are discussed. 

In addition to chemical analysis a number of physical and mechanical properties are employed to determine cemented carbide quaUty. Standard test methods employed by the iadustry for abrasive wear resistance, apparent grain size, apparent porosity, coercive force, compressive strength, density, fracture toughness, hardness, linear thermal expansion, magnetic permeabiUty, microstmcture, Poisson s ratio, transverse mpture strength, and Young s modulus are set forth by ASTM/ANSI and the ISO. 

Fig. 2.21 Particle size of Tego Magnan powder in the as-received state, after milling for 100 h under the high-energy impact mode (IMP68 with two magnets at six and eight o clock positions) and after three cycles desorption at 350°C under 0.1 MPa pressure for 15 min annealing at 350°C under pre-vacuum for 15 min/absorption at 350°C under 3.2 MPa pressure for 15 min. Grain size of 3-MgHj is shown above each data point...

---