High‐pressure behavior of iron carbide (Fe7C3) at inner

Recent experimental studies on Fe-C phase relations at high pressures have demonstrated that Fe 7 C 3 iron carbide is a likely candidate for the Earth's inner core. Using electronic structure calculations, we determine the equation of state, the full elastic constant tensor, and the sound wave velocities for

High-pressure deformation and amorphization in boron

2019-6-3  Shock studies of boron carbide have proposed phase transformation at high pressures, but to date, no conclusive evidence has been corroborative to prove the existence of new high-pressure phases. We propose a new rationale toward deciphering the amorphization phenomenon in boron carbide

High-Pressure, High-Temperature Behavior of Silicon

2020-1-7  Abstract: The high-pressure behavior of silicon carbide (SiC), a hard, semi-conducting material commonly known for its many polytypic structures and refractory nature, has increasingly become the subject of current research. Through work done both experimentally and computationally,

Magic high-pressure strengthening in tungsten carbide

2019-5-1  High-pressure strengthening is reported to be an effective approach to strengthen materials in addition to traditional nanocrystalline strengthening. Numerous studies have proven that high pressure is an important factor for improving the mechanical properties of materials. Here, we sintered high-purity sub-micron tungsten carbide (sm-WC

Crystals Free Full-Text High-Pressure, High

The high-pressure behavior of silicon carbide (SiC), a hard, semi-conducting material commonly known for its many polytypic structures and refractory nature, has increasingly become the subject of current research. Through work done both experimentally and computationally, many interesting aspects of high-pressure

(PDF) High Pressure Behavior of Titanium-Silicon Carbide

2003-6-15  The dynamic high-pressure behavior and phase stability of titanium– silicon carbide ( Ti 3SiC2), a. unique ceramic having metal-like properties, was investigated in this study. Time-resolved

Decomposition of silicon carbide at high pressures and

2020-1-7  silicon, and carbon. The decomposition of SiC at high pressure and temperature has implications for the stability of naturally forming moissanite on Earth and in carbon-rich exoplanets. DOI: 10.1103/PhysRevB.96.174102 I. INTRODUCTION Silicon carbide (SiC) attracts wide interest owing to its semiconductor nature, high bulk modulus, and high melting

Influence of high pressure on the threshold displacement

2012-9-1  The threshold displacement energies in silicon carbide under different pressures are determined with ab initio molecular dynamics. The results show that the threshold displacement energies change anisotropically in different crystallographic directions when high pressure is applied.

HPGR Studs_Zhuzhou Cemented Carbide Works Imp. &Exp

HPGR Studs-Zhuzhou Cemented Carbide Works Imp. &Exp . Co.-High pressure grinding rolls (HPGR) are used for particle reduction in mining operations and cement industry. Known for energy efficient reduction, HPGRs are most often utilized when the processed

Mechanical behavior of high entropy carbide (HfTaZrTi)C

2020-10-17  The evolution of structural, elastic, and electronic properties of high entropy carbide (HfTaZrTi)C and (HfTaZrNb)C under high pressure have been studied within the framework of density functional theory (DFT) in conjunction with special quasirandom structures.

Magic high-pressure strengthening in tungsten carbide

2019-5-1  High-pressure strengthening is reported to be an effective approach to strengthen materials in addition to traditional nanocrystalline strengthening. Numerous studies have proven that high pressure is an important factor for improving the mechanical properties of materials. Here, we sintered high-purity sub-micron tungsten carbide (sm-WC

High-pressure deformation and amorphization in boron

2019-6-3  Shock studies of boron carbide have proposed phase transformation at high pressures, but to date, no conclusive evidence has been corroborative to prove the existence of new high-pressure phases. We propose a new rationale toward deciphering the amorphization phenomenon in boron carbide

(PDF) High Pressure Behavior of Titanium-Silicon Carbide

2003-6-15  The dynamic high-pressure behavior and phase stability of titanium– silicon carbide ( Ti 3SiC2), a. unique ceramic having metal-like properties, was investigated in this study. Time-resolved

Crystals Free Full-Text High-Pressure, High

The high-pressure behavior of silicon carbide (SiC), a hard, semi-conducting material commonly known for its many polytypic structures and refractory nature, has increasingly become the subject of current research. Through work done both experimentally and computationally, many interesting aspects of high-pressure

Influence of high pressure on the threshold displacement

2012-9-1  The threshold displacement energies in silicon carbide under different pressures are determined with ab initio molecular dynamics. The results show that the threshold displacement energies change anisotropically in different crystallographic directions when high pressure is applied.

Decomposition of silicon carbide at high pressures and

2020-1-7  silicon, and carbon. The decomposition of SiC at high pressure and temperature has implications for the stability of naturally forming moissanite on Earth and in carbon-rich exoplanets. DOI: 10.1103/PhysRevB.96.174102 I. INTRODUCTION Silicon carbide (SiC) attracts wide interest owing to its semiconductor nature, high bulk modulus, and high melting

Decomposition of silicon carbide at high pressures and

2017-11-3  We measure the onset of decomposition of silicon carbide, SiC, to silicon and carbon (e.g., diamond) at high pressures and high temperatures in a laser-heated diamond-anvil cell. We identify decomposition through x-ray diffraction and multiwavelength imaging radiometry coupled with electron microscopy analyses on quenched samples. We find that B3 SiC (also known as 3C or zinc blende SiC

hpgr tungsten cemented carbide studs for High Pressure

High performance of carbide stud extends the life of High-Pressure-Grinding-Roller. HAO Carbide provides quality carbide studs with good wear resistance and high compressive strength, which can satisfy the requirements of different conditions. As the core part of vertical impact crusher (sandstone equipment ), Carbide stud is widely used in

Structural stability of uranium carbide (UC) under high

2019-12-1  The search of lowest enthalpy structure carried out at zero pressure and at high pressure of 40 GPa using evolutionary structure search method implemented in the USPEX code [,,] in conjunction with VASP package [,,]within GGA and GGA + U scheme suggested that at zero pressure the B1 phase displays the lowest enthalpy.However, at 40 GPa, the orthorhombic phase having space group Pmmn and 2

Nanocrystalline high‐entropy carbide ceramics with

2021-9-2  The nanocrystalline (Hf 0.25 Zr 0.25 Ta 0.25 Ti 0.25)C high-entropy carbide ceramics were successfully prepared through high-pressure sintering of the self-synthesized nanopowders for the first time. The results showed that the relative density, grain size, hardness, and elastic modulus of all the as-prepared samples increased gradually with

High-pressure behavior of iron carbide (Fe<subscr>7

High‐pressure behavior of iron carbide (Fe7C3) at inner core conditions Mainak Mookherjee,1 Yoichi Nakajima,1 Gerd Steinle‐Neumann,1 Konstantin Glazyrin,1 Xiang Wu,1,2 Leonid Dubrovinsky,1 Catherine McCammon,1 and Aleksandr Chumakov3 Received 1 July 2010; revised 29 October 2010; accepted 14 January 2011; published 1 April 2011.

Influence of high pressure on the threshold displacement

2012-9-1  The threshold displacement energies in silicon carbide under different pressures are determined with ab initio molecular dynamics. The results show that the threshold displacement energies change anisotropically in different crystallographic directions when high pressure is applied.

(PDF) Decomposition of silicon carbide at high pressures

2017-11-3  The high-pressure decomposition temperatures measured are considerably lower than those at ambient, with our measurements indicating that SiC begins to decompose at ∼2000 K at 60 GPa as compared

Decomposition of silicon carbide at high pressures and

2017-11-3  We measure the onset of decomposition of silicon carbide, SiC, to silicon and carbon (e.g., diamond) at high pressures and high temperatures in a laser-heated diamond-anvil cell. We identify decomposition through x-ray diffraction and multiwavelength imaging radiometry coupled with electron microscopy analyses on quenched samples. We find that B3 SiC (also known as 3C or zinc blende SiC

Mechanical behavior of high entropy carbide (HfTaZrTi)C

2020-10-17  The evolution of structural, elastic, and electronic properties of high entropy carbide (HfTaZrTi)C and (HfTaZrNb)C under high pressure have been studied within the framework of density functional theory (DFT) in conjunction with special quasirandom structures.

A high-pressure and high-temperature synthesis of

2005-1-1  High-pressure synthesis is a powerful method for the preparation of novel materials with high elastic moduli and hardness. Additionally, such materials may exhibit interesting thermal, optoelectronic, semiconducting, magnetic, or superconducting properties. We report on the new high-pressure, high-temperature synthesis of platinum carbide.

Structural stability of uranium carbide (UC) under high

2019-12-1  The search of lowest enthalpy structure carried out at zero pressure and at high pressure of 40 GPa using evolutionary structure search method implemented in the USPEX code [,,] in conjunction with VASP package [,,]within GGA and GGA + U scheme suggested that at zero pressure the B1 phase displays the lowest enthalpy.However, at 40 GPa, the orthorhombic phase having space group Pmmn and 2

Hydrogen adsorption properties of carbide-derived

2021-4-26  Synthesis of carbide-derived carbons. • High pressure hydrogen adsorption isotherms up to 200 MPa at room temperature. • Calculated adsorbate density from linear high pressure region of isotherm. • Absolute adsorption isotherms constructed assuming that the

Nanocrystalline high‐entropy carbide ceramics with

2021-9-2  The nanocrystalline (Hf 0.25 Zr 0.25 Ta 0.25 Ti 0.25)C high-entropy carbide ceramics were successfully prepared through high-pressure sintering of the self-synthesized nanopowders for the first time. The results showed that the relative density, grain size, hardness, and elastic modulus of all the as-prepared samples increased gradually with

Properties of nanostructured diamond-silicon carbide

2011-3-3  A high-pressure silicon infiltration technique was applied to sinter diamond–SiC composites with different diamond crystal sizes. Composite samples were sintered at pressure 8 GPa and temperature 2170 K. The structure of composites was studied by evaluating x-ray diffraction peak profiles using Fourier coefficients of ab initio theoretical size and straun profiles. The composite samples have