Thermal diffusivity of particulate composites made from aluminum oxide and nickel aluminide by a photothermal deflection technique

Journal Article · Tue Jul 01 00:00:00 EDT 1997 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(96)00387-4· OSTI ID:524548

Chung, Y D; Chojnacka, A P; Avedisian, C T; Raj, R ^[1]

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1. Cornell Univ., Ithaca, NY (United States)

The photothermal deflection technique is used to measure the thermal diffusivity of a metal-ceramic composite. The present, as well as other data on composites are analyzed to estimate a value for the Kapitza radius, r{sub k}, which represents the effective value of the thermal boundary resistance of heterointerfaces. Remarkably, the data from different metal-ceramic composite materials lead to a similar value (within a factor of about two), r{sub k} {approx} 1 {micro}m. Possible reasons for this outcome are discussed in terms of the acoustic mismatch model for thermal boundary resistance. Analysis of the data also suggests possible anomalous effects in nanostructured materials.

• OSTI ID: 524548
• Journal Information: Acta Materialia, Vol. 45, Issue 7; Other Information: PBD: Jul 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
THERMAL DIFFUSIVITY
ALUMINIUM OXIDES
NICKEL ALLOYS
ALUMINIUM ALLOYS
COMPOSITE MATERIALS
INTERMETALLIC COMPOUNDS
INTERFACES
THERMAL BOUNDARY RESISTANCE
DATA ANALYSIS