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Fundamentos de Nanociencias,
         Nanotecnología y sus Implicaciones Sociales


              Propuesta de Proyecto de Investigación:
Fabricación y Determinación de la Conductividad Térmica
 Efectiva de un Compuesto de Aluminio y Nanotubos de
Carbono CNT´s y evaluar su aplicación en Disipadores de
                         Calor
       Presentado por: Arlex Guzman (arlexrush@gmail.com)
                Asesorado por: Dr. Anwar Hasmy
                                 Dr. Ernesto Medina.

                          Enero, 2012
EL PROBLEMA

Fabricación y Determinación de la Conductividad Térmica
Efectiva de un Compuesto de Aluminio y Nanotubos de
Carbono (CNT´s) con la finalidad de usarlo como material
para el diseño y fabricación de Disipadores e
Intercambiadores de Calor.
OBJETIVO GENERAL
Fabricar un Compuesto de Aluminio y Nanotubos
de Carbono (CNT´s), determinar su Conductividad
Térmica Efectiva y evaluar su aplicación en
Disipadores de Calor.

            OBJETIVOS ESPECIFICOS
Describir Propiedades Térmicas de los CNTs en compuestos de
Aluminio-CNTs (Al-CNTs).
Evaluar los diferentes métodos de Síntesis de compuestos de Al-
CNTs.
Propuesta de Diseño y Fabricación de Compuesto CNTs-Aluminio
(Síntesis).
Medición y Determinación de la Conductividad Térmica Efectiva del
Compuesto Al-CNTs.
Caracterización del compuesto Al-CNTs.
Evaluación de la aplicabilidad en disipadores de Calor.
DEFINICIÓN DE PROYECTO
VARIABLES DE INVESTIGACIÓN.


    •   Kapitza Interface Resistance.

    •   Alignment.

    •   Dispersion.

    •   Umklapp phonon-phonon scattering processes.

    •   length efficiency in CNT (< 1 μm).        Para longitudes mayores reduce la
        conductividad Térmica debido a curbaturas y doblados.



                       TÉCNICAS DE SINTESIS
Técnicas de Síntesis de Compuestos.
Spray de Plasma




   Fig. 1. Schematic showing the plasma spray formed cylinder (not to scale) and the
   orientation of the sample used for thermal conductivity measurement.
Técnicas de Síntesis de Compuestos.
semi-solid powder processing




 Carbon nanotube reinforced aluminum composite fabricated by semi-solid powder processing.
 Yufeng Wu1, Gap-Yong Kim∗
 Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA
Técnicas de Síntesis de Compuestos.

•   Natural rubber as a mixing medium.

•   Molecular-level mixing method.

•   Thermal Spraying.

•   Hot-pressing.

•   Hot extrusion.

•   Spark plasma sintering.

•   Electro-less deposition.
Técnicas de Medición
Medición de Conductividad Térmica. Flash Diffusivity.



     k = α x ῥ x CP
      α: Thermal diffusivity, was measured using a Holometrix Micromet-300 Thermal Diffusivity
      Instrument (Metrisa Inc., Bedford, MA) by the pulse method for several temperatures
      between 50 °C and 300 °C

      ῥ: bulk density, of the composite which was measured by the Archimedes method and found
      to be 2.44 g cm3 and 2.35 g cm3 for Al–Si and Al-10CNT coatings respectively.


      CP: specific heat capacity, were taken as the mole fraction weighted average (Neumann– Kopp
      additive rule) and the values for the CP for Al–Si and CNT (Graphite) were obtained from the
      thermodynamic database FACTSAGE™
Técnicas de Medición
Medición de Conductividad Térmica. Modelos Teóricos y
Computacionales
Caracterización
Compuesto de Al-
10%w.CNTs, fabricado
por Spray de Plasma




  Optical micrographs showing low magnification microstructures of (a) Al–Si and (b) Al–10CNT coatings. (c) High magnification
  SEM image of fracture surface of Al–10CNT coating showing good CNT distribution in the matrix region, and (d) SEM image
  showing a partially infiltrated porous CNT cluster in the Al–10CNT coating.
Técnicas de Medición
 Compuesto de Al-10%w.CNTs, fabricado por Spray de Plasma.
       RESULTADOS DE APLICACIÓN DEL OOF.




Fig. 5. (a) Binary image of the distribution of CNTs in the inter-splat region obtained from the SEM image of fracture surface (Fig.
3c), (b) the finite element mesh of the binary
image with boundary conditions applied for analysis, and (c) the heat flux distribution variation along the microstructure. Note
the high heat flux along the CNTs owing to
their high thermal conductivity.
ANTECEDENTES
   ANALISIS DE ARTICULO
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Conductividad termica de compuestos de aluminio propuesta ii

  • 1. Fundamentos de Nanociencias, Nanotecnología y sus Implicaciones Sociales Propuesta de Proyecto de Investigación: Fabricación y Determinación de la Conductividad Térmica Efectiva de un Compuesto de Aluminio y Nanotubos de Carbono CNT´s y evaluar su aplicación en Disipadores de Calor Presentado por: Arlex Guzman (arlexrush@gmail.com) Asesorado por: Dr. Anwar Hasmy Dr. Ernesto Medina. Enero, 2012
  • 2. EL PROBLEMA Fabricación y Determinación de la Conductividad Térmica Efectiva de un Compuesto de Aluminio y Nanotubos de Carbono (CNT´s) con la finalidad de usarlo como material para el diseño y fabricación de Disipadores e Intercambiadores de Calor.
  • 3. OBJETIVO GENERAL Fabricar un Compuesto de Aluminio y Nanotubos de Carbono (CNT´s), determinar su Conductividad Térmica Efectiva y evaluar su aplicación en Disipadores de Calor. OBJETIVOS ESPECIFICOS Describir Propiedades Térmicas de los CNTs en compuestos de Aluminio-CNTs (Al-CNTs). Evaluar los diferentes métodos de Síntesis de compuestos de Al- CNTs. Propuesta de Diseño y Fabricación de Compuesto CNTs-Aluminio (Síntesis). Medición y Determinación de la Conductividad Térmica Efectiva del Compuesto Al-CNTs. Caracterización del compuesto Al-CNTs. Evaluación de la aplicabilidad en disipadores de Calor.
  • 4. DEFINICIÓN DE PROYECTO VARIABLES DE INVESTIGACIÓN. • Kapitza Interface Resistance. • Alignment. • Dispersion. • Umklapp phonon-phonon scattering processes. • length efficiency in CNT (< 1 μm). Para longitudes mayores reduce la conductividad Térmica debido a curbaturas y doblados. TÉCNICAS DE SINTESIS
  • 5. Técnicas de Síntesis de Compuestos. Spray de Plasma Fig. 1. Schematic showing the plasma spray formed cylinder (not to scale) and the orientation of the sample used for thermal conductivity measurement.
  • 6. Técnicas de Síntesis de Compuestos. semi-solid powder processing Carbon nanotube reinforced aluminum composite fabricated by semi-solid powder processing. Yufeng Wu1, Gap-Yong Kim∗ Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA
  • 7. Técnicas de Síntesis de Compuestos. • Natural rubber as a mixing medium. • Molecular-level mixing method. • Thermal Spraying. • Hot-pressing. • Hot extrusion. • Spark plasma sintering. • Electro-less deposition.
  • 8. Técnicas de Medición Medición de Conductividad Térmica. Flash Diffusivity. k = α x ῥ x CP α: Thermal diffusivity, was measured using a Holometrix Micromet-300 Thermal Diffusivity Instrument (Metrisa Inc., Bedford, MA) by the pulse method for several temperatures between 50 °C and 300 °C ῥ: bulk density, of the composite which was measured by the Archimedes method and found to be 2.44 g cm3 and 2.35 g cm3 for Al–Si and Al-10CNT coatings respectively. CP: specific heat capacity, were taken as the mole fraction weighted average (Neumann– Kopp additive rule) and the values for the CP for Al–Si and CNT (Graphite) were obtained from the thermodynamic database FACTSAGE™
  • 9. Técnicas de Medición Medición de Conductividad Térmica. Modelos Teóricos y Computacionales
  • 10. Caracterización Compuesto de Al- 10%w.CNTs, fabricado por Spray de Plasma Optical micrographs showing low magnification microstructures of (a) Al–Si and (b) Al–10CNT coatings. (c) High magnification SEM image of fracture surface of Al–10CNT coating showing good CNT distribution in the matrix region, and (d) SEM image showing a partially infiltrated porous CNT cluster in the Al–10CNT coating.
  • 11. Técnicas de Medición Compuesto de Al-10%w.CNTs, fabricado por Spray de Plasma. RESULTADOS DE APLICACIÓN DEL OOF. Fig. 5. (a) Binary image of the distribution of CNTs in the inter-splat region obtained from the SEM image of fracture surface (Fig. 3c), (b) the finite element mesh of the binary image with boundary conditions applied for analysis, and (c) the heat flux distribution variation along the microstructure. Note the high heat flux along the CNTs owing to their high thermal conductivity.
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