Research on the forming and strengthening mechanism and performance thermal stability of microstructures induced by laser shock imprinting

2022 ◽  
Vol 146 ◽  
pp. 107589
Author(s):  
Lala Zhao ◽  
Yisai Wang ◽  
Yanqing Wang ◽  
Yan Wang ◽  
Haifeng Yang
Keyword(s):  
Thermal Stability ◽  
Strengthening Mechanism ◽  
Laser Shock ◽  
And Performance ◽  
Thermal Stability Of

Strengthening Mechanism and Thermal Stability of Spray Formed H13 Steel

2019 ◽  
Vol 295 ◽  
pp. 49-56
Author(s):  
Zhan Zhan Zhang ◽  
Wan Zhen Wang ◽  
Yun Bo Chen ◽  
Miao Hui Wang ◽  
Chang De Zhao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Transmission Electron Microscopy ◽  
Strengthening Mechanism ◽  
H13 Steel ◽  
Tempering Temperature ◽  
Transmission Electron ◽  
Tempering Treatment ◽  
Hardness Values ◽  
Thermal Stability Of

The aim of this work is to study the strengthening mechanism and thermal stability of spray formed H13 steel. The microstructure and hardness of spray formed H13 steels are investigated by electron microscopy, transmission electron microscopy and hardness measurementscanning. The calculated results demonstrate that tensile strength, impact energy and hardness values of sprayed-formed H13 steel are higher than that of as-cast H13 steel when the tempering temperature is 600 °C after quenched at 1050 °C. Compared with as-cast H13 steels, tempered spray-formed H13 steels possess supernal high-temperature temper resistant stability. The chemical composition of the carbides in spray-formed steels is V and Cr rich spherical carbides are hardly influenced by the tempering treatment.

Optimization of Thermal Stability of Atrium Based on Computational Modeling

2016 ◽  
Vol 861 ◽  
pp. 353-360
Author(s):  
Aleš Rubina ◽  
Pavel Uher ◽  
Petr Blasinski
Keyword(s):  
Thermal Stability ◽  
Air Conditioning ◽  
Computer Modelling ◽  
Ventilation System ◽  
Air Conditioning System ◽  
Indoor Space ◽  
Central Air Conditioning ◽  
And Performance ◽  
Thermal Stability Of ◽  
Occupied Zone

The article deals with analysis of the heat balance and temperature microclimate of indoor space of a four-storey building atrium. With regard to the anticipated thermal loads in all functionally connected rooms, investor made a request to verify the thermal stability of the atrium before the implementation stage. Atrium and adjacent rooms are a geometrically complicated inner space which cannot be solved by analytical methods to ensure the required temperature conditions in occupied zone. This led to the creation of a mathematical model of the atrium with the current project solution. The result of the simulation of the existing solutions is that there is not complied desired air temperature in the occupied zone. For this reason, it was developed optimization of existing variant. Optimization was performed in steps as changing temperature of the central air conditioning system, changing number of units and performance of local refrigeration air conditioning. The conclusion of this paper is to evaluate the thermal profiles of temperature stratification in the atrium area and request the required cooling performance of the ventilation system. The article attempts to use computer modelling as a tool for the placement and performance design of ventilation equipment.

scholarly journals Synthesis and Performance of 6FDA-Based Polyimide-Ionenes and Composites with Ionic Liquids as Gas Separation Membranes

Membranes ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 79 ◽  
Author(s):  
Kathryn O’Harra ◽  
Irshad Kammakakam ◽  
Emily Devriese ◽  
Danielle Noll ◽  
Jason Bara ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ionic Liquids ◽  
Gas Separation ◽  
High Thermal Stability ◽  
Hybrid Membranes ◽  
High Co2 ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
And Performance ◽  
Thermal Stability Of

Three new isomeric 6FDA-based polyimide-ionenes, with imidazolium moieties and varying regiochemistry (para-, meta-, and ortho- connectivity), and composites with three different ionic liquids (ILs) have been developed as gas separation membranes. The structural-property relationships and gas separation behaviors of the newly developed 6FDA polyimide-ionene + IL composites have been extensively studied. All the 6FDA-based polyimide-ionenes exhibited good compatibility with the ILs and produced homogeneous hybrid membranes with the high thermal stability of ~380 °C. Particularly, [6FDA I4A pXy][Tf2N] ionene + IL hybrids having [C4mim][Tf2N] and [Bnmim][Tf2N] ILs offered mechanically stable matrixes with high CO2 affinity. The permeability of CO2 was increased by factors of 2 and 3 for C4mim and Bnmim hybrids (2.15 to 6.32 barrers), respectively, compared to the neat [6FDA I4A pXy][Tf2N] without sacrificing their permselectivity for CO2/CH4 and CO2/N2 gas pairs.

scholarly journals Zeolite templated carbon: Preparation, characterization and performance as filler material in co-polyimide membranes for CO2/CH4 separation

2019 ◽  
Vol 15 (3) ◽  
pp. 407-413
Author(s):  
Triyanda Gunawan ◽  
Taufik Qodar Romadiansyah ◽  
Rika Wijiyanti ◽  
Wan Norharyati Wan Salleh ◽  
Nurul Widiastuti
Keyword(s):  
Thermal Stability ◽  
Zeolite Y ◽  
Gas Permeability ◽  
Polymeric Membrane ◽  
Structure Evolution ◽  
Separation Performance ◽  
Polyimide Membrane ◽  
And Performance ◽  
Thermal Stability Of ◽  
Templated Carbon

Zeolite templated carbon (ZTC), a structurally unique carbon material was used as new fillers for the preparation of composite polymeric membrane derived from BTDA-TDI/MDI (P84) co-polyimide. The thermal stability of membrane, the structure evolution, morphology and topology, as well as gas separation performance of modified membranes were investigated. Zeolite-Y, a hard template for ZTC, was synthesized via hydrothermal method. The ZTC was synthesized via impregnation of sucrose as carbon precursor into zeolite pore and followed by carbonization at 800°C. The zeolite template was removed through acid treatment to obtain ZTC, which was used as fillers for membrane preparation. The membrane was prepared using P84 co-polyimide as membrane precursor via phase inversion process. Synthesized materials were characterized using SEM, XRD, N2 adsorption-desorption isotherm and TEM. The thermal stability of membrane was improved by the addition of ZTC. As the result of ZTC loading into P84 co-polyimide membrane, the gas permeability of CO2 increased thirty-four times, as well as the CO2/CH4 selectivity boosted from 0.76 to 5.23.  The ordered pore structure in ZTC plays important role in increasing the permeability and selectivity performances of the P84 co-polyimide membrane.

scholarly journals Effect of acetylene content in working gas on microstructure and thermal stability of DLC coating

2020 ◽  
Vol 206 ◽  
pp. 02022
Author(s):  
Jun Bi ◽  
Jihua Peng ◽  
Liejun Li
Keyword(s):  
Thermal Stability ◽  
Effective Means ◽  
High Hardness ◽  
Methane Content ◽  
304 Stainless Steel ◽  
Dlc Coatings ◽  
Good Thermal Stability ◽  
Dlc Coating ◽  
And Performance ◽  
Thermal Stability Of

The DLC coatings were deposited onto the surface of 304 stainless steel by using PE-CVD method and Ar+C2H2 as working gas. The effects of the methane content in the working gas on the structure, hardness, thermal stability of the coating were analyzed by means of SEM, FTIR, Raman and nano-indenter. It is found that controlling methane content in the work gas can be used as an effective means to modulate the structure and performance of the DLC coating. With reducing methane content in the gas mixture, the surface sputtering effect by Ar+ is enhanced, which leads a drop of hydrogen content in the coating. A high sp3C-C content in the DLC coating can be obtained by selecting an appropriate methane flow, which derives a combination of high hardness and good thermal stability for the coating. a combination of high hardness and good thermal stability for the coating.

Thermal stability of surface nanostructure produced by laser shock peening in a Ni-based superalloy

2017 ◽  
Vol 311 ◽  
pp. 337-343 ◽  
Author(s):  
Luo Sihai ◽  
Nie Xiangfan ◽  
Zhou Liucheng ◽  
You Xi ◽  
He Weifeng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Surface Nanostructure ◽  
Shock Peening ◽  
Thermal Stability Of

Preparation and Thermal Stability of Micro/Nano Silicone Rubber Particles

2011 ◽  
Vol 399-401 ◽  
pp. 718-721
Author(s):  
Fei Wang ◽  
Xin Long Wang
Keyword(s):  
Thermal Stability ◽  
Silicone Rubber ◽  
Crosslinking Agent ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Ft Ir ◽  
And Performance ◽  
Polymerization Method ◽  
Thermal Stability Of

The micro/nano particles of silicone rubber were prepared with α, ω-dihydroxy polyorganosiloxane, as basic polymer and crosslinking agent via emulsion polymerization method at room temperature. The structure and performance of the particles were characterized by transmission electron microscopy (TEM), FT-IR, thermogravimetric analysis (TGA) and X-ray diffraction (XRD). The results indicated that the particles had certain ordered structure and thermal stability.

Preparation and Performance Research of New High Toughness EVA Material

2016 ◽  
Vol 852 ◽  
pp. 657-662
Author(s):  
Xiao Li Yang ◽  
Huai Qing Wang ◽  
Le Lv ◽  
Sheng Lei Yuan ◽  
Jian Cai ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Vinyl Acetate ◽  
Thermoplastic Polyurethane ◽  
Ethylene Vinyl Acetate ◽  
High Toughness ◽  
And Performance ◽  
Performance Research ◽  
Thermal Stability Of

The blends of ethylene vinyl acetate (EVA) and thermoplastic polyurethane (TPU) were prepared by means of blending. The mechanical properties of EVA/TPU blends and thermal stability of the extrudates were investigated. The results show that the toughness of EVA/TPU has been improved after adding TPU into EVA, and doesn’t affect the thermal stability of material.

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