By G.P. Srivastava (auth.), Subhash L. Shindé, Jitendra S. Goela (eds.)
Thermal administration has turn into a ‘hot’ box lately because of a necessity to procure excessive functionality degrees in lots of units utilized in such varied components as house technology, mainframe and computer pcs, optoelectronics or even formulation One racing automobiles! Thermal options require not only caring for very excessive thermal flux, but in addition ‘hot spots’, the place the flux densities can exceed 2 hundred W/cm2.
High thermal conductivity fabrics play an enormous function in addressing thermal administration matters. This quantity offers readers a uncomplicated knowing of the thermal conduction mechanisms in those fabrics and discusses how the thermal conductivity should be on the topic of their crystal buildings in addition to microstructures built because of their processing historical past. The concepts for actual dimension of those homes on huge in addition to small scales were reviewed. specified info at the thermal conductivity of numerous fabrics together with aluminum nitride (AlN), silicon carbide (SiC), diamond, in addition to carbon nanotubes has been awarded. The emphasis is on constructing uncomplicated realizing of the inter-relationships among thermal conductivity and processing such that the readers can behavior their very own study during this fascinating box of excessive thermal conductivity fabrics. Engineers and scientists focused on addressing thermal administration concerns in a vast spectrum of industries should still locate this publication a precious source of their paintings.
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Thermal administration has turn into a ‘hot’ box in recent times because of a necessity to acquire excessive functionality degrees in lots of units utilized in such different components as area technological know-how, mainframe and computing device pcs, optoelectronics or even formulation One racing vehicles! Thermal strategies require not only taking good care of very excessive thermal flux, but in addition ‘hot spots’, the place the flux densities can exceed two hundred W/cm2.
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Extra info for High Thermal Conductivity Materials
In such cases, the Debye model described in the previous subsection for acoustic phonons can be extended to include optical phonon branches. This can be done by increasing the Debye radius qD to include both acoustic and optical branches. Rewriting Eq. , we consider one atom per unit cell, as required in the original Debye consideration), and we consider n = 2 to include optical phonons as well. , Einstein model) for optical phonons. This model would disallow any heat transport by optical phonons, but interactions of type ac + ac → op would be allowed, provided the mass ratio lies in the range 1 < m1 /m2 ≤ 3.
The usual method of producing ceramics is by powder processing and sintering. Recent research has shown that material processing involving the use of high-purity nitride powders, hot-pressing (pressure sintering), and additives leads to a signiﬁcant increase in the thermal conductivity of ceramics and thin ﬁlms, with values close to those for single crystals (see Watari et al.  and references therein). Investigations by Goldsmidt and Penn  and by Parrott , based on the relaxation-time theory described in this chapter, predict that sintered materials should have considerably smaller thermal conductivity than their single-crystal counterparts.
It is worth pointing out that, depending on their helical structures, carbon nanutubes can be metallic or semiconducting, but here we are only interested in discussing their lattice thermal conductivity contributed by phonons. The features of phonon-dispersion curves responsible for low-temperature speciﬁc heat and the conductivity along the tube axis depend strongly on the tube diameter. Theoretical work by Benedict et al. , much below Debye temperature) the speciﬁc heat exhibits a quasi-one-dimensional behavior: for small tube radius R, and lower temperatures, Cvsp ∝ T ; otherwise, Cvsp ∝ T 2 .
High Thermal Conductivity Materials by G.P. Srivastava (auth.), Subhash L. Shindé, Jitendra S. Goela (eds.)