Reaction–diffusion bonding of CVD SiC using CrAl thin coating layer

2021 ◽  
Author(s):  
Hyeon-Geun Lee ◽  
Daejong Kim ◽  
Weon-Ju Kim ◽  
Ji Yeon Park
Keyword(s):  
Diffusion Bonding ◽  
Coating Layer ◽  
Reaction Diffusion ◽  
Thin Coating

scholarly journals Superplastic Forming and Reaction Diffusion Bonding Process of Hollow Structural Component for Mg-Gd-Y-Zn-Zr Rare Earth Magnesium Alloy

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 152
Author(s):  
Peng Peng ◽  
Shaosong Jiang ◽  
Zhonghuan Qin ◽  
Zhen Lu
Keyword(s):  
Mechanical Properties ◽  
Diffusion Bonding ◽  
Structural Component ◽  
Bonding Temperature ◽  
Reaction Diffusion ◽  
Superplastic Forming ◽  
Tensile Tests ◽  
Interface Roughness ◽  
Size Growth ◽  
Cu Interlayer

This work fabricated a double hollow structural component of Mg-8.3Gd-2.9Y-0.8Zn-0.2Zr alloy by superplastic forming (SPF) and reaction-diffusion bonding (RDB). The superplastic characteristic and mechanical properties of Mg-8.3Gd-2.9Y-0.8Zn-0.2Zr alloy sheets at 250–450 °C were studied. Tensile tests showed that the maximum elongation of tensile specimens was about 1276.3% at 400 °C under a strain rate of 1 × 10−3 s−1. Besides, the effect of bonding temperature and interface roughness on microstructure and mechanical properties of the reaction diffusion-bonded joints with a Cu interlayer was investigated. With the increase of temperature, the diffusion coefficient of Cu increases, and the diffusion transition region becomes wider, leading to tightening bonding of the joint. However, the bonding quality of the joint will deteriorate due to grain size growth at higher temperatures. Shear tests showed that the highest strength of the joints was 152 MPa (joint efficiency = 98.7%), which was performed at 460 °C.

Reaction-Diffusion Bonding of High Nb Containing TiAl Alloy

2014 ◽  
Vol 43 (1) ◽  
pp. 28-31 ◽  
Author(s):  
Song Xiaoguo ◽  
Cao Jian ◽  
Liu Jiakun ◽  
Zhao Liyan ◽  
Feng Jicai
Keyword(s):  
Diffusion Bonding ◽  
Tial Alloy ◽  
Reaction Diffusion

Model Experiment Study on Anti-Explosion Characteristics of Underground Caverns Reinforced by External Cross-Anchoring

2014 ◽  
Vol 852 ◽  
pp. 826-830
Author(s):  
Jian Jun Wang ◽  
Ya Jun Wang ◽  
Chang Ying Guo
Keyword(s):  
Model Experiment ◽  
Coating Layer ◽  
Protective Layer ◽  
Thin Coating ◽  
Experiment Study ◽  
Minimum Thickness ◽  
Compressive Stresses ◽  
Test Models ◽  
Underground Caverns ◽  
Overall Stability

The objective of this paper is exactly to assess the effect of anti-explosion for tunnels anchored outside under the condition of thin coating layer. To meet the similarity requirements, two groups of test models were made to simulate the responses of caverns under blast loading. It showed that: been anchored outside, displacements of the wall in caverns was decreased, so were the acceleration and compressive stresses with varying degrees, but the deformation stiffness and the overall stability were enhanced. This method does not take up space inside but it is beneficial to reduce the minimum thickness of protective layer and provides a new way to improve the anti-explosion performance for caverns under the conditions of thin coating layer.

Annealing-induced evolution at the LiCoO2 /LiNbO3 interface and its functions in all-solid-state batteries with a Li10GeP2S12 electrolyte

2020 ◽  
Author(s):  
Xueying Sun ◽  
Satoshi Hori ◽  
Yuxiang Li ◽  
Yuto Yamada ◽  
Kota Suzuki ◽  
...  
Keyword(s):  
Solid State ◽  
Solid Electrolytes ◽  
Coating Layer ◽  
Reversible Capacity ◽  
Thin Coating ◽  
Active Materials ◽  
Solid State Batteries ◽  
All Solid State Batteries

A thin coating layer between the cathode active materials (CAMs) and solid electrolytes (SEs) is indispensable for alleviating the reaction at the CAM/SE interface and thereby enhancing the reversible capacity...

Opening-mode micro-cracking in brittle coatings on ductile wires/rods

2016 ◽  
Vol 26 (1) ◽  
pp. 119-146 ◽  
Author(s):  
Xin He ◽  
Fangliang Chen ◽  
Huiming Yin
Keyword(s):  
Applied Load ◽  
Coating Layer ◽  
Fracture Initiation ◽  
Optical Microscope ◽  
Alumina Coating ◽  
Thin Coating ◽  
Aluminum Wire ◽  
Element Simulation ◽  
Fracture Development ◽  
Lag Model

A simplified two-dimensional model is presented to simulate periodically distributed micro-cracking in a thin coating fully bonded to an elastoplastic aluminum wire/rod. The alumina coating which is generated by anodic oxidation is treated as an elastic material, while the ductile aluminum wire substrate is characterized by a bi-linear elastoplastic hardening model. An elastoplastic shear lag model is applied to transfer the shearing stress from the substrate layer to the thin coating. When the coated structure is subjected to different applied load, the system will undergo different stress levels and exhibit different cracking stages. Accordingly, explicit solutions corresponding to different loading stages are presented based on a generalized axisymmetric formulation. Finite element simulation is employed to verify the present elastic solution when the applied load is relatively small and the whole system is in the elastic state. Experimental characterization is conducted to validate the present elastoplastic solution when the substrate or interlayer undergoes large deformation. A versatile high-fidelity optical microscope is utilized to check the micro structure of the coating and continuously monitor the fracture development in the coating layer, through which valuable detailed micro-cracking information, such as critical applied load corresponding to crack initiation, crack pattern and crack spacing, is obtained. It shows that the presented fracture model is able to accurately capture the stress and strain distribution in the coated structure and predict the fracture initiation, infilling, and saturation in the thin coating layer.

scholarly journals Formation of Defects in Solid-Liquid Reaction-Diffusion Bonding of Copper Using a Tin Film Interlayer

2017 ◽  
Vol 6 (5) ◽  
pp. 188-194
Author(s):  
Shinji FUKUMOTO ◽  
Toshinari KIZAWA ◽  
Michiya MATSUSHIMA ◽  
Hiroaki HOKAZONO ◽  
Kozo FUJIMOTO
Keyword(s):  
Diffusion Bonding ◽  
Reaction Diffusion ◽  
Tin Film ◽  
Liquid Reaction ◽  
Solid Liquid

scholarly journals α-Silicene as oxidation-resistant ultra-thin coating material

2017 ◽  
Vol 8 ◽  
pp. 1808-1814 ◽  
Author(s):  
Ali Kandemir ◽  
Fadil Iyikanat ◽  
Cihan Bacaksiz ◽  
Hasan Sahin
Keyword(s):  
Density Functional Theory ◽  
Protective Coating ◽  
Ground State ◽  
Density Functional ◽  
Coating Layer ◽  
Single Layer ◽  
High Energy ◽  
Thin Coating ◽  
Functional Theory ◽  
Oxidation Resistant

By performing density functional theory (DFT)-based calculations, the performance of α-silicene as oxidation-resistant coating on Ag(111) surface is investigated. First of all, it is shown that the Ag(111) surface is quite reactive against O atoms and O2 molecules. It is known that when single-layer silicene is formed on the Ag(111) surface, the 3 × 3-reconstructed phase, α-silicene, is the ground state. Our investigation reveals that as a coating layer, α-silicene (i) strongly absorbs single O atoms and (ii) absorbs O2 molecules by breaking the strong O–O bond. (iii) Even the hollow sites, which are found to be most favorable penetration path for oxygens, serves as high-energy oxidation barrier, and (iv) α-silicene becomes more protective and less permeable in the presence of absorbed O atom. It appears that single-layer silicene is a quite promising material for ultra-thin oxidation-protective coating applications.

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