A5101692438- Boron and Carbon Nanomaterials Research
- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Advanced ceramic materials synthesis
- MXene and MAX Phase Materials
- Advanced materials and composites
- High-pressure geophysics and materials
- Ferroelectric and Negative Capacitance Devices
- Additive Manufacturing Materials and Processes
- Thermal properties of materials
- Nuclear Physics and Applications
- Bone Tissue Engineering Materials
- Additive Manufacturing and 3D Printing Technologies
- Intermetallics and Advanced Alloy Properties
- High Entropy Alloys Studies
- Chemical Thermodynamics and Molecular Structure
- Dental Implant Techniques and Outcomes
- 2D Materials and Applications
- Energetic Materials and Combustion
- High-Temperature Coating Behaviors
- Electronic and Structural Properties of Oxides
Sichuan University
2011-2024
The average measured Hv for polycrystalline ReB2 and Ti–B composites under different loads shows that the tendency of to decrease becomes weak large loads, hardness is always lower than composites. For comparison, results from Chung et al. were inserted into figure.
Polycrystalline cubic boron nitride (PcBN) has been synthesized at 14 GPa and high temperatures of 1300–2000 °C in a two-stage multi-anvil cell. Sintered PcBN 1700–1800 with grain size ∼200 nm is optically transparent transmittance ∼70% wavelengths 400–1500 the Vickers hardness ∼63–69 GPa. Analyses scanning transmission electron microscopy reveal that can be strengthened by introducing nanometer-scale grains microscopic defects pressure temperature. The optical transparency bulk temperature...
An anvil-preformed gasket system has been developed to extend the pressure range for widely used large volume cubic press without sacrificing sample volume. The relationship of chamber versus load this was calibrated at room temperature using transitions in Bi, Tl, and Ba. With similar volumes (8-11 mm diameter 8 length), can generate pressures up about 8.5 GPa, significantly higher than 6 which generally maximum conventional anvil-gasket system. details on optimized design are given note.
Using submicron cubic boron nitride (cBN) powder as a starting material, polycrystalline cBN (PcBN) samples without additives were sintered from 8.0–14.0 GPa at 1750 °C, and their sintering behaviour mechanical properties investigated. Transmission electron microscopy analysis showed that high-density nanotwins could be generated common grains during high pressure temperature treatment. The dislocation glide (111) micro-twinning are the main mechanisms underlie plastic deformation in...
Abstract The sintering behavior and mechanical properties of cubic boron nitride (cBN) composites, using the mixture cBN–Ti3Al cBN–Ti3Al-Al as starting material respectively, were investigated under high pressure temperature (HPHT) conditions. results show that samples system have more homogeneous microstructures. Young's modulus, shear bulk modulus measured by ultrasonic measurements can reach to 782±3 GPa, 344±1 348±2 respectively. hardness increases remarkably with rising, reaches highest...
Polycrystalline cubic boron nitride (PcBN) compacts, using the mixture of submicron (cBN) powder and hexagonal BN (hBN) as starting materials, were sintered at pressures 6.5–10.0 GPa temperature 1750 °C without additives. In this paper, sintering behavior mechanical properties samples investigated. The XRD patterns reveal that single phase was observed when pressure exceeded 7.5 hBN contents ranged from 20 vol.% to 24 vol.%, which is ascribed like-internal generated grain-to-grain contact...
In this paper, a pressurization-insulation and pre-sealing (PIPS) system is designed to increase the cell pressure of widely used large volume cubic press without sacrificing volume. The sample chamber was sandwiched between pair tungsten carbide anvils as pressurization system. Ultra-high in cavity up about 12 GPa, limit had increased by 100% contrast with that an anvil-gasket (AG) Furthermore, confining around supported grade 304 stainless steel zirconia–calcium oxide solid solution before...
The influence of sintering pressure on the mechanical properties bulk titanium carbide (TiC) fabricated through work hardening at high and temperature is investigated systematically. A series pure polycrystalline TiC samples are prepared by micrometer-sized powders a 9.0–14.0 GPa 1500 °C. These then characterized various techniques for determining their residual stress, grain size, density, microstructural defects, hardness, fracture toughness. results demonstrate that Vickers hardness HV...
A new heating method is proposed to increase the cell temperature of 6–8 type multi-anvil apparatus without reducing volume sample chamber. The double-layer heater assembly (DHA) has two layers heaters connected in parallel. was able reach 2500 °C by using 0.025 mm rhenium foils, and limit increased 25% compared with that traditional single-layer assembly. power–temperature relationships for these assemblies different sizes were calibrated W/Re thermocouple at 20 GPa. When samples same, DHA...
The compression behavior and high-pressure strength of alpha silicon nitride (α-Si3N4) at pressures up to 60 GPa are studied using synchrotron radiation powder diffraction, complemented with first-principles calculations. Compression experiments reveal that a-Si3N4 remains stable under the highest pressure ambient temperature has a bulk modulus K0 = 256.3(±4) GPa, derivative K′0 5.6. However, experiment is higher than calculation (232.5 GPa). correlation between confirmed by diffraction peak...