Plastic magnetic

Table 3.20 shows property examples of plastic magnets based on ferrites or rare earths. 

Ferrites induce ferromagnetic properties and are used to make plastic magnets. 

MAJOR PRODUCT APPLICATIONS plastic magnets, xerographic materials, filters, fibers, energy attenuating powders, microwave absorbing materials... 

Applications Polymers are nonmagnetic materials but they can be modified by fillers. Plastic magnets, first introduced in 1955, are inferior to cast and sintered magnets but have many desirable properties such as low cost, ease of production, better uniformity and reproducibility. Plastic magnets are used in electronic instruments, communication, household utensils, and audio equipment. 

Polymer magnets, although common today, are a quite recent development. The first patent application was filed in France in 1955. Since that time, many ferromagnetic fillers have found their way to market. Plastics magnets do not match the performance of metal magnets but their properties are being systematically improved. 

Another important application area is the non-destructive defectoscopy of electronic components. Fig.2a shows an X-ray shadow image of a SMC LED. The 3-dimensional displacement of internal parts can only be visualized non-destructively in the tomographic reconstmction. Reconstructed cross sections through this LED are shown in Fig.2b. In the same way most electronic components in plastic and thin metal cases can be visualized. Even small electronic assemblies like hybrid ICs, magnetic heads, microphones, ABS-sensors can be tested by microtomograpical methods. 

Teflon stir bar 1 heavy duty balloon 1 roll of electrical tape Magnetic stirrer Support stand and clamps Ohaus triple beam scale 1 plastic funnel... 

Cobalt difluoride [10026-17-2] C0F2, is a pink solid having a magnetic moment of 4, 266 x 10 J/T (4.6 Bohr magneton) (1) and closely resembling the ferrous (Fep2) compounds. Physical properties are Hsted in Table 1. Cobalt(II) fluoride is highly stable. No decomposition or hydrolysis has been observed in samples stored in plastic containers for over three years. 

Hot pressing to produce substantial texture and magnetic anisotropy via plastic deformation is accompHshed by a process referred to as... 

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