Ultra-refractory Diboride Ceramics for Solar Plant Receivers

Effect of TiC incorporation on the optical properties and oxidation resistance of SiC ceramics

“…In all cases, the directional emittance increases with the heating temperature and the effect is higher when the TiC proportion increases. The increase in emittance with the measured temperature has already been reported for other borides and carbides [20,48].…”

“…Thanks to their spectral selectivity, metal borides, nitrides or carbides could be good candidates for solar absorber applications [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In addition, these materials have extremely high thermal stability, good thermo-chemical and thermo-mechanical properties, high hardness, high electrical and thermal conductivities [25][26][27][28].…”

Measurement of the melting temperature of ZrB2 as determined by laser heating and spectrometric analysis

“…In performing such comparison, the assumption was made that the emittance data from the present study coincide with the real material emissivity insofar as the shallow liquid or rapidly solidifying ZrB 2 layer can be considered as an ideally flat and homogeneous surface as emissivity and emittance in theory coincide in perfectly homogeneous and opaque materials. The only literature data relative to pure ZrB 2 are those measured by Mercatelli et al 33 Those authors measured the total hemispherical emittance of ZrB 2 up to 1450 K and the total hemispherical reflectance in the ultraviolet–visible–near‐infrared range at room temperature. Technically, neither of these datasets can be directly compared with the present NSE results.…”

Multifunctional transition metal diboride thin films grown by magnetron sputtering with metal-ion irradiation

“…Their high strength at elevated temperatures couples with good thermal conductivity, which provides a high thermal-shock resistance under severe heat fluxes, make them suitable for use in many aerospace applications such as rocket components, atmospheric reentries, jet engine turbines, and, in particular, sharp leading edges and propulsion systems in hypersonic vehicles, with speeds exceeding Mach 5 [1,[3][4][5][6][7][8][9][10]. In addition, there is also a growing demand for employing TM diborides in hightemperature electrodes [11][12][13], molten metal containment [1], refractory crucibles [14], thermocouple protection tubes in steel baths and aluminum reduction cells [15,16], reinforcement fibers [17,18], solar power [19][20][21][22][23], and armor applications [16]. The use of diborides in advanced nuclear fission reactors as neutron absorber materials, which are intentionally introduced into reactor cores to control the neutron balance, is also of great interest [15,24,25].…”