scholarly journals Optimization of 3D Inlay Mode of “Z-Pins Like” V0.9-Si0.1 Rods and Their Improvement Effect on the Anti-Ablative Performance of C/C-ZrC-SiC

2021 ◽  
Author(s):  
Tian Tian ◽  
Wei Sun ◽  
Xin Qing ◽  
Yuhao Chu ◽  
Haikun Chen ◽  
...  
Keyword(s):  
Oxide Layer ◽  
Corrosion Damage ◽  
Multicomponent Oxide ◽  
Ablation Time ◽  
Oxide Melt ◽  
Matrix Surface ◽  
The Matrix ◽  
Improvement Effect

Abstract Neoteric “Z-pins like” vanadium0.9-silicon0.1 rods (V0.9-Si0.1 rods) as polybasic multiphase oxide compensators were prepared to improve the anti-ablation of C/C-ZrC-SiC over 2500 °C. The microstructure and improvement effect on the anti-ablation of different C/C-ZrC-SiC surface were investigated. Results show that the density of “Z-pins like” V0.9-Si0.1 rod was effectively improved after adding Si. When ablation time was less than 180 s, “Z-pins like” V0.9-Si0.1 rods perpendicular to non-woven cloth layer presented the best improvement of the anti-ablation performance by liquid/gaseous multicomponent oxide compensation. However, when ablation time was greater than 180 s, “Z-pins like” V0.9-Si0.1 rods perpendicular to non-woven cloth layer increased another harm that weaken the anti-ablative performance of C/C-ZrC-SiC, namely, the corrosion damage of oxide layer on the matrix surface caused by excessive oxide melt. Therefore, there is a best improvement of the anti-ablation performance of “Z-pins like” V0.9-Si0.1 rods parallel to non-woven cloth layer.

Recent Advances in Biohybrid Materials for Tissue Engineering and Regenerative Medicine

2016 ◽  
Vol 04 (01) ◽  
pp. 1640001 ◽  
Author(s):  
Ying Wan ◽  
Xing Li ◽  
Shenqi Wang
Keyword(s):  
Tissue Engineering ◽  
Regenerative Medicine ◽  
Cell Function ◽  
Rapid Prototype ◽  
Artificial Organs ◽  
Specific Cell ◽  
Cell Matrix ◽  
Matrix Surface ◽  
The Matrix ◽  
Cell Matrix Interactions

Biohybrid materials play an important role in tissue engineering, artificial organs and regenerative medicine due to their regulation of cell function through specific cell–matrix interactions involving integrins, mostly those of fibroblasts and myofibroblasts, and ligands on the matrix surface, which have become current research focus. In this paper, recent progress of biohybrid materials, mainly including main types of biohybrid materials, rapid prototype (RP) technique for construction of 3D biohybrid materials, was reviewed in detail; moreover, their applications in tissue engineering, artificial organs and regenerative medicine were also reviewed in detail. At last, we address the challenges biohybrid materials may face.

scholarly journals 9,10-ANTHRAQUINONE-2,6-DISULFONIC ACID DISODIUM SALT/ EPOXY GRAPHITE COMPOSITE FOR ANODE IN MICROBIAL FUEL CELL

2017 ◽  
Vol 79 (5-3) ◽  
Author(s):  
Mimi Hani Abu Bakar ◽  
Neil F Pasco ◽  
Ravi Gooneratne ◽  
Kim Byung Hong
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Conductive Filler ◽  
Internal Resistance ◽  
Disodium Salt ◽  
Disulfonic Acid ◽  
Graphite Composite ◽  
Design Flexibility ◽  
Matrix Surface ◽  
The Matrix

Properties such as electrical conductivity, low resistivity, chemicals and corrosion resistance are mostly found in carbon based materials. Epoxy resin is excellent for electrical insulation and can be used as a conductor with the addition of conductive filler. Combinations of carbon and epoxy show qualities of a conductive electrode, mechanically strong with design flexibility and thus makes them suitable as electrodes in microbial fuel cell (MFC). In this study, graphite-epoxy composites were fabricated with multi-walled carbon nanotube (MWCNT) embedded in the matrix surface. 9,10-Anthraquinone-2,6-disulfonic acid disodium salt/polypyrrole (PPy/AQDS) was used as mediator, covalently electrografted on electrode’s surface. Electrochemical stability of anodes during continuous operation were measured in air-cathode MFCs. It appears that maximum power in MFC could be increased up to 42% with surface modification using PPy/AQDS. Internal resistance (Rint) could be reduced up to 66% with the inclusion of MWCNT. These findings show that a one-day fabrication of a-ready-to-use conductive electrode is possible for graphite content between 70-80% (w/w).

scholarly journals Application of Kelvin Probe Force Microscopy (KFM) to Evidence Localized Corrosion of Over-Aged Aeronautical 2024 Aluminum Alloy

2013 ◽  
Vol 550 ◽  
pp. 127-134
Author(s):  
Nicoleta Radutoiu ◽  
Joël Alexis ◽  
Loïc Lacroix ◽  
Marioara Abrudeanu ◽  
Jacques Alain Petit
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Rate ◽  
Pitting Corrosion ◽  
Corrosion Damage ◽  
Localized Corrosion ◽  
Kelvin Probe ◽  
Force Microscopy ◽  
Intermetallic Particles ◽  
2024 Alloy ◽  
The Matrix

The 2xxx serie aluminum alloys are characterized by good mechanical performances and low density, however they are susceptible to different forms of localized corrosion: pitting corrosion, intergranular corrosion and stress corrosion cracking. The 2024-T351 aluminum alloy is used in the aircraft industry for numerous applications such as fuselage and door skin. Corrosion damage of the material is also very detrimental for the structural integrity of the aircraft. The presence of coarse intermetallic particles, with a heterogeneous size distribution was found to be responsible for the 2024 susceptibility to localized corrosion. These particles are generally the cause of initiation sites. Presence of micro-defects in the oxide film upon coarse intermetallic particles and the galvanic coupling with the matrix contribute to the development of pitting corrosion. The over-ageing treatment (T7) is supposed to stabilize the microstructure and the mechanical properties to improve the corrosion resistance. The 2024 alloy microstructure after the T7 heat treatment remains very complex. The 2024 alloy corrosion behavior was studied in the over-ageing state for three different temperatures (150, 175 and 190 °C). During the corrosion tests in chloride-containing environment, the behavior of coarse intermetallic particles was found to be different. Thus, the 2024 samples suffer a gradual attack upon S-Al2CuMg particles and finally Al (Cu,Mn,Fe,Si) particles. The corrosion damage was studied by Atomic Force Microscopy (AFM) and Kelvin probe Force Microscopy (KFM). This technique allows simultaneous topographical and electric potential mapping to be obtained. This latest potential was shown to be correlated to the corrosion potential of the 2024 alloy. This study focuses on the variation of the KFM potential of the coarse intermetallic particles and the matrix for the over-ageing conditions (T7). Observations using optical microscope and AFM were also performed to obtain the corrosion rate for each condition. The corrosion rate was correlated to the chemical composition variation of the particles obtained by scanning electron microscope observations and EDS analyses.

The Relationship between Tensile Ductility Loss and Microstructures for the Hot Exposed γ-Tial Alloys

2012 ◽  
Vol 452-453 ◽  
pp. 1361-1364 ◽  
Author(s):  
Yong Juan Jing ◽  
Xiao Hong Li ◽  
Xi Shan Yue
Keyword(s):  
Critical Temperature ◽  
Oxide Layer ◽  
Tensile Ductility ◽  
Tial Alloys ◽  
Ductility Loss ◽  
The Matrix ◽  
The Relationship ◽  
Exposure Process

In this paper, the relationship between the tensile ductility loss and the conditions including the exposure process and microstructures for the hot exposed TiAl alloys was researched. The critical temperature corresponding to the ambient tensile ductility loss to 0.8% was sensitive to the microstructure. It was 800°C/100h exposure for the near fully lamella microstructure. Due to the oriented lamella, the near fully lamella microstructure was benefit for forming the oxide layer rich in Al to present further oxidation of the matrix.

Preparation of Nano Ti3SiC2/MoSi2 Composite by SPS Process

2011 ◽  
Vol 284-286 ◽  
pp. 2414-2419 ◽  
Author(s):  
Jun Cai Zhang ◽  
Cheng Chang Jia
Keyword(s):  
Mechanical Activation ◽  
Particle Diameter ◽  
Second Phase ◽  
Strong Restriction ◽  
Matrix Surface ◽  
Second Phase Particles ◽  
The Matrix ◽  
Strong Repulsion

In this paper, nano-Ti3SiC2/MoSi2 composite, whose second phase was 20-150nm, was in situ prepared by mechanical activation (MA) and SPS process with the quaternary powers of Mo, Si, Ti, and C. The results showed that: (1) matrix MoSi2 has strong repulsion to other elements, which leads to more second-phase particles inside the matrix rather than on the matrix surface; (2) matrix MoSi2 has strong restriction on the growing of the second phase, which makes the particle diameter of the second phase inside the matrix only in 200 nm around, while that over the surface reaches to 800 nm around.

scholarly journals Composite lithium metal anode by melt infusion of lithium into a 3D conducting scaffold with lithiophilic coating

2016 ◽  
Vol 113 (11) ◽  
pp. 2862-2867 ◽  
Author(s):  
Zheng Liang ◽  
Dingchang Lin ◽  
Jie Zhao ◽  
Zhenda Lu ◽  
Yayuan Liu ◽  
...  
Keyword(s):  
Composite Electrode ◽  
High Current Density ◽  
3D Structure ◽  
Carbon Matrix ◽  
Lithium Metal ◽  
Metal Anode ◽  
Lithium Metal Anode ◽  
Matrix Surface ◽  
Conductive Surface ◽  
The Matrix

Lithium metal-based battery is considered one of the best energy storage systems due to its high theoretical capacity and lowest anode potential of all. However, dendritic growth and virtually relative infinity volume change during long-term cycling often lead to severe safety hazards and catastrophic failure. Here, a stable lithium–scaffold composite electrode is developed by lithium melt infusion into a 3D porous carbon matrix with “lithiophilic” coating. Lithium is uniformly entrapped on the matrix surface and in the 3D structure. The resulting composite electrode possesses a high conductive surface area and excellent structural stability upon galvanostatic cycling. We showed stable cycling of this composite electrode with small Li plating/stripping overpotential (<90 mV) at a high current density of 3 mA/cm2 over 80 cycles.

Microstructure and Interface Analysis of Glass Particulate Reinforced Aluminum Matrix Composite

2013 ◽  
Vol 795 ◽  
pp. 578-581 ◽  
Author(s):  
Shamsul Baharin Jamaludin ◽  
Josef Hadipramana ◽  
Mohd Fitri Mohd Wahid ◽  
Kamarudin Hussin ◽  
Azmi Rahmat
Keyword(s):  
Aluminum Oxide ◽  
Oxide Layer ◽  
Ageing Time ◽  
Solution Treatment ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite ◽  
Artificial Ageing ◽  
Micro Cracks ◽  
The Matrix ◽  
Aluminum Oxide Layer

A characterization of microstructure and interface was made on the composites Al-4 % Cu reinforced with 15 wt. % glass particulate. The composite was fabricated by powder metallurgy followed by solution treatment and artificial ageing. The microstructures of the composite showed that the glass particulates were in-homogenously distributed in the matrix and segregated near copper. The aluminum oxide layer was found between aluminum, copper and glass particulate. Micro cracks were observed in the aluminum oxide layer and at the interface between aluminum oxide layer and aluminum. Hardness increased as ageing time increased. Interface behavior and aging time influenced the hardness of the composite.

Friction and Wear of Self-Lubricating Metallic Materials

1975 ◽  
Vol 97 (2) ◽  
pp. 217-220 ◽  
Author(s):  
E. Rabinowicz
Keyword(s):  
Friction And Wear ◽  
Analytical Study ◽  
Fine Particles ◽  
Simple Calculation ◽  
Hard Metal ◽  
Filler Concentration ◽  
Matrix Surface ◽  
Large Particles ◽  
The Matrix ◽  
Better Than

An experimental and analytical study has been carried out to discover the factors which determine the friction and wear coefficients of composites consisting of a hard metal matrix and a softer filler. To be effective the filler should have a lower metallurgical compatibility than the matrix against the other sliding surface. The concentration of the filler should be at least a few percent so that it can be smeared out over the matrix surface, and there is an upper limit to filler concentration associated with loss of bulk strength of the composite. A simple calculation suggests that large particles of filler material are better than fine particles with 20 micrometer particles being the smallest that are fully effective.

Research on Embedding Strength of Diamond

2011 ◽  
Vol 480-481 ◽  
pp. 560-567
Author(s):  
Jun De Yang ◽  
Zhong Ping Luo ◽  
Fan Lu ◽  
Yuan Wang
Keyword(s):  
Tungsten Carbide ◽  
Diamond Drill ◽  
Diamond Drilling ◽  
Drill Bits ◽  
Matrix Surface ◽  
The Matrix ◽  
Diamond Saw ◽  
The Cost ◽  
Diamond Saw Blades ◽  
Drilling Bit

It is stated that Diamond saw blades requires high embedding strength of the diamond, while diamond drill bits do not. It is necessary to improve the embedding strength of diamond in diamond saw blades, rather than in the diamond drilling bits. It is recommended to count the number of diamond particles on the matrix surface and get the embedding strength of diamond by calculation. Another recommendation is to use the compound powder of cobalt and tungsten carbide for pelletizing in order to improve the embedding strength of diamond and lower the cost of matrix. There are people studying how to raise embedding strength of diamond, for both diamond saw blades and diamond drilling bit. However, the requirements for embedding strength of diamond saw blades and diamond drilling bit are different. The following parts include the analysis for this problem.

Study on the Corrosion Resistance Behavior of Multi-Elements Alloy CoCrFeNiTi0.5

2014 ◽  
Vol 541-542 ◽  
pp. 61-68
Author(s):  
Sheng Jiao Pang ◽  
Ping Li ◽  
Ting Ju Li ◽  
Jie Zhao
Keyword(s):  
Corrosion Resistance ◽  
Oxide Scale ◽  
Oxide Layer ◽  
Good Adhesion ◽  
Tube Material ◽  
Protective Oxide ◽  
Good Thermal Stability ◽  
The Matrix ◽  
Internal Sulfidation ◽  
Melting Point Eutectic

Multi-elements alloy with good thermal stability is expected to serve as the superheater tube material of ultra-supercritical boiler and may suffer from hot corrosion under the coal-fired atmosphere. In this study, the corrosion resistance behavior of multi-elements alloy CoCrFeNiTi0.5 coated with alkali metal sulfates at 750°C is investigated systematically. The results showed the corrosion kinetics curves of the alloy followed a parabolic growth rate. The corrosion products, which consisted of volatile Na (CrO4) (SO4), (Fe,Ni) xSy, Cr/Ti oxide as well as compound oxides with spinel structure AB2O4, were found in the oxide scale and internal attack zone of the alloy. The oxide layer had good adhesion with the matrix at the beginning of corrosion. Prolonging corrosion time, the oxide layer in thickness increased and became loose as well as porous. The micro-pores generated in the interface between the oxide scale and matrix with the occurrence of the internal oxidation and internal sulfidation. In a word, the corrosion resistance behavior of multi-elements alloy CoCrFeNiTi0.5 at 750°C can be attributed to the formation of the protective oxide layers and to the basic fluxing in molten Na4SO4 induced by low melting point eutectic.

Sign in / Sign up

Export Citation Format

Share Document