A Model for Determining Strength for Embedded Elliptical Crack in Ultra-high-temperature Ceramics

A Model for Determining Strength for Embedded Elliptical Crack in Ultra-high-temperature Ceramics

A fracture strength model applied at room temperature for embedded elliptical crack in brittle solid was obtained. With further research on the effects of various physical mechanisms on material strength, a thermo-damage strength model for ultra-high-temperature ceramics was applied to each temperature phase. Fracture strength of TiC and the changing trends with elliptical crack shape variation...

Ultra-refractory ceramics for high-temperature solar absorbers

It is well known that the efficiency of thermodynamic solar plants increases with the working temperature. At present the main limit in temperature upscaling is the absorber capability to withstand high temperatures. The ideal solar absorber works at high temperatures, has a low thermal emissivity and a high absorptivity in the solar spectral range . The paper reports on the high temperature em...

High-Temperature Cyclic Fatigue-Crack Growth in Monolithic Ti3SiC2 Ceramics

identical slip planes) and walls or kink boundaries. Thus, in addition to regular slip, mechanisms for ambient temperature The cyclic fatigue behavior of reactive hot-pressed Ti3SiCz plastic deformation in Ti3SiCz are thought to involve the ceramics are examined at temperatures from ambient to 1200°C readjustment of local stress and strain fields from kink band with the objective of characteriz...

Strength evaluation of sintered ceramics by dynamic crack path model

Ultra-High Temperature Ceramics for solar receivers: spectral and high-temperature emittance characterization

We report on the preparation, room temperature spectral reflectance and high-temperature thermal emittance characterization of different boride and carbide Ultra-High Temperature Ceramics (UHTCs). The investigated samples are compared with a reference material for solar absorber applications, i.e. silicon carbide. We show that spectral and thermal emittance properties of UHTCs are promising for...