AIN porous-shell hollow spheres

The structure of this chapter is as follows. Section 3.2 describes the fabrication of ID quasi-aligned AIN nanowhiskers by CS process. Section 3.3 illustrates the application of the as-synthesized AIN nanowhiskers as inorganic fillers for polymer-matrix packaging materials. Sections 3.4 and 3.5 show the growth of 3D flower-like AIN by CS assisted with mechanical activation (MA) and CS of AIN porous-shell hollow spheres, respectively. 

Combustion Synthesis of AIN Porous-Shell Hollow Spheres... 

Figure 3.14 FESEM images of (a, b) AIN porous-shell hollow spheres with different magnifications (inset of (b) a hollow sphere with broken shell), (c) a single hollow...

As a result, the inner A1 core was gradually evacuated, and finally the AIN porous-shell hollow spheres were obtained. Actually, many gray powders were observed in the combustion chamber after the reactions. XRD result (not shown here) indicated that these powders were hexagonal AlN phase, and carbon phase could not be detected, which might be due to the limitations of the measurement technique. 

In summary, ID AIN nanowhiskers, 3D flower-like AlN microstructure, and AlN porous-shell hollow spheres with uniform morphologies have been successfully fabricated by CS methods. The morphologies of products can be controlled by manipulating the combustion parameters. The present processes for synthesis of the AIN micro/nanostructures are facile, productive, reproducible, and energy saving. The as-synthesized AIN nanowhiskers have been applied to produce fillers as reinforcement for electrical packaging. However, in order to realize... 

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