Emissivity measurements of opaque gray bodies up to 2000 °C by a dual-frequency pyrometer

Measurements of the directional spectral emissivity based on a radiation heating source with alternating spectral distributions

“…The spectral emissivities of the un-oxdized high purity graphite are within (0.875, 0.914) for wavelengths of 1.15-1.60 lm. The emissivities agree well with the known radiation properties of carbon-based materials [41][42]. However, this comparison is only given as a reference since the physical conditions, temperature, and spectral range of the graphite sample do not perfectly match the conditions in the literature.…”

Developing uranium dicarbide–graphite porous materials for the SPES project

“…(2) A morphological effect deriving from the porosity present within the samples, as noted before (Table 2); the increase of emissivity with increasing the amount of porosity was previously reported in [51]. (3) A surface effect deriving from the observation that in the work of De Coninck the analyzed samples were polished before measurement, and this affects emissivity values as reported by many authors and also by this research group in [24].…”

“…The emissivity of the samples was measured using a double frequency infrared pyrometer (Modline5, IRCON, USA, working wavelength bands 0.85-1.05 lm and 1-1.10 lm, calibrated according to the Quality System ISO 9001:2000) as reported in [24]. The pyrometer was settled normal to the sample surface with radiation passing through a borosilicate glass window (Kodial view port, Torr Scientific Ltd., East Sussex-UK) almost completely transparent to infrared radiation (transmission up to 95%).…”

Fabrication of mesoporous and high specific surface area lanthanum carbide–carbon nanotube composites

“…Powders were manually mixed and grinded in an agatha mortar where a 2-4 wt% of phenolic resin in acetone solution at 10 wt% was added as binder. Powders were uniaxially pressed at 750 MPa and after extraction were heat treated under high vacuum (10 À4 Pa) in a graphite furnace [27] up to 1500°C, following the heat treatment schedule reported in Table 1.…”