Drop and recovery of thermal conductivity of AlN upon UV irradiation

AlShaikhi, Abdullah A.; Srivastava, G. P.

doi:10.1088/1742-6596/92/1/012084

Cited by 1 publication

(1 citation statement)

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“…Irradiation of AlN at room temperature with ultraviolet light has been shown to reversibly reduce its thermal conductivity due to increased phonon scattering cross section, the original thermal conductivity returning when irradiated with visible light [184,185]. The inner surface of the GCT will be exposed to high levels of UV radiation from the helicon plasma during operation.…”

Section: Thermal Conductivitymentioning

confidence: 99%

A review of the processing, composition, and temperature-dependent mechanical and thermal properties of dielectric technical ceramics

et al. 2011

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The current review uses the material requirements of a new space propulsion device, the Variable Specific Impulse Magnetoplasma Rocket (VASIMR ® ) as a basis for presenting the temperature dependent properties of a range of dielectric ceramics, but data presented could be used in the engineering design of any ceramic component with complementary material requirements. A material is required for the gas containment tube (GCT) of VASIMR ® to allow it to operate at higher power levels. The GCT's operating conditions place severe constraints on the choice of material. A dielectric is required with a high thermal conductivity, low dielectric loss factor, and high thermal shock resistance. There is a lack of a representative set of temperature-dependent material property data for materials considered for this application and these are required for accurate thermo-structural modelling. This modelling would facilitate the selection of an optimum material for this component. The goal of this paper is to determine the best material property data values for use in the materials selection and design of such components. A review of both experimentally and theoretically-determined temperature-dependent & room temperature properties of several materials has been undertaken. Data extracted are presented by property. Properties reviewed are density, Young's, bulk and shear moduli, Poisson's ratio, tensile, flexural and compressive strength, thermal conductivity, specific heat capacity, thermal expansion coefficient and the factors affecting maximum service temperature. Materials reviewed are alumina, aluminium nitride, beryllia, fused quartz, sialon and silicon nitride.

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Section: Thermal Conductivitymentioning

confidence: 99%