scholarly journals Various Thermal Coefficients İnvestigation of 3C-Sic Nanoparticles at the Different Heating Rates

2021 ◽  
Author(s):  
Elchin Huseynov ◽  
Tural G. Naghiyev
Keyword(s):  
Silicon Carbide ◽  
Thermal Processing ◽  
Theoretical Calculations ◽  
Nanocrystalline Silicon ◽  
Hydroxyl Groups ◽  
Heating Rates ◽  
Sic Nanoparticles ◽  
Thermophysical Parameters ◽  
Sic Particles ◽  
Nanocrystalline Silicon Carbide

Abstract Several thermal parameters were analyzed for nanocrystalline silicon carbide (3C-SiC) particles at the performed depending on the thermal processing rate. The hydroxyl groups on the surface of nanocrystalline 3C-SiC particles have been investigated as a function of temperature and heating rate. Specific heat capacity and Gibbs energy of silicon carbide nanoparticles have been determined in the temperature range of 300 ÷ 1270K at the various heating rates. The enthalpy and the entropy were calculated at different thermal processing rates (theoretical calculations are confirmed based on experimental results). Experminetal results obtained for all thermophysical parameters were comparatively studied at different thermal processing rates.PACS: 61.46.+w, 65.80.+n, 67.80.Gb

Behaviour of Nanocrystalline Silicon Carbide Under Low Energy Heavy Ion Irradiation

2009 ◽  
Vol 1215 ◽  
Author(s):  
Dominique Gosset ◽  
Laurence Luneville ◽  
Gianguido Baldinozzi ◽  
David Simeone ◽  
Auregane Audren ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Grain Size ◽  
Ion Irradiation ◽  
Healing Process ◽  
Grazing Incidence ◽  
Nanocrystalline Silicon ◽  
Heavy Ion ◽  
Before And After ◽  
Gen Iv ◽  
Nanocrystalline Silicon Carbide

AbstractSilicon carbide is one of the most studied materials for core components of the next generation of nuclear plants (Gen IV). In order to overcome its brittle properties, materials with nanometric grain size are considered. In spite of the growing interest for nano-structured materials, only few experiments deal with their behaviour under irradiation. To assess and predict their evolution under working conditions, it is important to characterize their microstructure and structure. To this purpose, we have studied microcrystalline and nanocrystalline samples before and after irradiation at room temperature with 4 MeV Au ions. In fact, it is well established that such irradiation conditions lead to amorphisation of the material, which can be restored after annealing at high temperature. We have performed isochronal annealings of both materials to point out the characteristics of the healing process and eventual differences related to the initial microstructure of the samples. To this purpose Grazing Incidence X-Ray Diffraction has been performed to determine the microstructure and structure parameters. We observe the amorphisation of both samples at similar doses but different annealing kinetics are observed. The amorphous nanocrystalline sample recovers its initial crystalline state at higher temperature than the microcrystalline one. This effect is clearly related to the initial microstructures of the materials. Therefore, the grain size appears as a key parameter for the structural stability and mechanical properties of this ceramic material under irradiation.

Sign in / Sign up

Export Citation Format

Share Document