scholarly journals An approach to effectively improve the interfacial bonding of nano-perfused composites by in situ growth of CNTs

2021 ◽  
Vol 10 (1) ◽  
pp. 282-291
Author(s):  
Xingxing Chen ◽  
Ying Li ◽  
Ying Wang ◽  
Dingquan Song ◽  
Zuowan Zhou ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Bonding Strength ◽  
Impact Damage ◽  
High Strength ◽  
Interfacial Bonding ◽  
Resin Composites ◽  
Alloy Matrix ◽  
Interfacial Bonding Strength ◽  
Ni Alloy

Abstract Nano molding technology (NMT) has shown great potential in the preparation of metal/resin composites, which can integrate resin and metal into a lightweight, high-strength metal matrix composite. However, due to the poor interfacial bonding strength between metal and polymer, the application of the metal/polymer composites is limited. In this paper, we proposed a novel method to improve the bonding strength between Fe–Co–Ni alloy and epoxy resin by Nano Perfusion Technology (NPT), featuring in situ growth of carbon nanotubes (CNTs) in the pores on anodized Fe–Co–Ni alloy porous surface, followed by a perfusion of epoxy resin throughout the pores that had been in situ grown CNTs. Due to the “anchor effect” of CNTs, the bonding strength between the epoxy and the alloy matrix is improved. The results showed that the interfacial bonding between the in situ CNTs-modified alloy and the resin was significantly improved compared to the metal-resin composites surface treated with T-treatment in traditional method of NMT. The maximum interfacial bonding force of the alloy-CNTs/epoxy composite reached up to 691.80 N, which was 460, 315, and 267% higher than those by mechanical treatment, without CNTs and T-treatment, respectively. This work provides a new approach to protect metals or alloys from environmental corrosion, impact damage, and so on.

Repair and cryogenic mechanical properties with resin film infused (RFI) GFRP in out-of-autoclave processing

2020 ◽  
Vol 34 (07n09) ◽  
pp. 2040014
Author(s):  
Yun-Hae Kim ◽  
Kyo-Moon Lee ◽  
Seong-Jae Park ◽  
Kyung-In Jo ◽  
Soo-Jeong Park
Keyword(s):  
Mechanical Properties ◽  
Bonding Strength ◽  
Bending Strength ◽  
High Strength ◽  
Parent Material ◽  
Interfacial Bonding ◽  
Interfacial Bonding Strength ◽  
Resin Film ◽  
Air Pockets ◽  
Cryogenic Mechanical Properties

Prepreg technology generates air pockets at the interface of laminates under heating and pressurization. The air pockets cause defects in the through-thickness direction. This includes poor adhesion between layers, which degrades material properties. Therefore, in this study, cryogenic mechanical properties were compared to obtain uniform properties by using prepreg laminated and resin film infused glass fiber reinforced plastic (GFRP) composites (“PP-only” and “RF-only”, respectively) while maintaining the constituent contents of the fiber and polymer. Moreover, stepped repair was applied to extend the life of composites. The results demonstrated that the stiffness of the composites improved, and the brittleness increased in cryogenic environments. In the case of PP-only, numerous voids were observed inside the polymer, which showed higher bending strength than RF-only; however, it exhibited significantly lower interfacial bonding strength. When applied to secondary bonding of stepped repair, RF-only as repair layers showed high strength recovery rate in homogeneous materials, and not in heterogeneous materials. In contrast, the high strength PP-only as a parent material and RF-only as repair layers showed relatively good interfacial bonding strength due to primary damage in the PP of a parent material. Hence, the RF-only can be considered useful as a repair material.

Study on the In Situ Growth of Carbon Nanotubes for the Reinforcement of Cf/SiC Composite Fabricated by CVI+PIP Process

2013 ◽  
Vol 745-746 ◽  
pp. 582-586 ◽  
Author(s):  
Jian Bao Hu ◽  
Shao Ming Dong ◽  
Xiang Yu Zhang ◽  
Zhen Wang ◽  
Hai Jun Zhou ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Bonding Strength ◽  
Volume Fraction ◽  
Interfacial Bonding ◽  
Mechanical And Thermal Properties ◽  
Fiber Volume ◽  
Pull Out ◽  
Interfacial Bonding Strength

Cf/SiC composites were fabricated through in situ growth of carbon nanotubes (CNTs) on three-dimensional needle-punched carbon fabric via chemical vapor deposition and polymer impregnation and pyrolysis process. The mechanical and thermal properties of the composites were investigated. The flexural strength and fracture toughness were decreased due to the fiber volume fraction loss and much shorter pull-out length of fibers which was caused by the higher interfacial bonding strength between fiber and matrix after the growth of CNTs. Brittle fracture character of CNTs was observed due to the strong interfacial bonding strength between CNTs and matrix. The parallel thermal conductivity and perpendicular thermal conductivity were improved to 14.5% and 8.0% respectively.

scholarly journals Experimental Research on Interfacial Bonding Strength between Vertical Cast-In-Situ Joint and Precast Concrete Walls

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 494
Author(s):  
Changyong Li ◽  
Yabin Yang ◽  
Jiuzhou Su ◽  
Huidi Meng ◽  
Liyun Pan ◽  
...  
Keyword(s):  
Rough Surface ◽  
Bonding Strength ◽  
Precast Concrete ◽  
Good Choice ◽  
Interfacial Bonding ◽  
Wall Structure ◽  
Test Results ◽  
Concrete Walls ◽  
Interfacial Bonding Strength

In the monolithic precast concrete shear-wall structure, the bonding property of cast-in-situ joints to precast concrete walls is important to ensure the entire structural performance. Aiming to the vertical joint of precast concrete walls, an experimental study was carried out considering the factors including the strength of precast and joint concretes, as well as the interface processing and casting age of precast concrete. The micro-expansion self-compacting concrete was used for the cast-in-situ joints. The interfacial bonding strength between joint and precast concrete was measured by splitting tensile test. Results show that the interfacial bonding strength was benefited from the increasing strength of joint concrete and the spraying binder paste on the interface of precast concrete, and unbenefited from the overtime storage of precast concrete. The washed rough surface with exposed aggregates improved the interfacial bonding strength, which increased with the increasing roughness. Based on the test results, the limits of the strength grade of joint concrete and the roughness of washed rough surface are proposed to get the interfacial bonding strength equivalent to the tensile strength of precast concrete. Meanwhile, the spraying of binder paste on precast concrete is a good choice, the storage time of precast components is a better limit within 28 days.

Impermeability and interfacial bonding strength of TiO2-graphene modified epoxy resin coated OPC concrete

2021 ◽  
Vol 151 ◽  
pp. 106029
Author(s):  
Si-Yao Guo ◽  
Hui-Hua Luo ◽  
Zhe Tan ◽  
Ji-Zhou Chen ◽  
Lihai Zhang ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Bonding Strength ◽  
Interfacial Bonding ◽  
Interfacial Bonding Strength ◽  
Modified Epoxy

A simple way to synthesize nano-scale stable epoxy emulsion for sizing CF/epoxy composites

2021 ◽  
Author(s):  
YiFan Chen ◽  
Lei Ding ◽  
Chao Cui ◽  
Zhengxiang Zhong ◽  
Li Liu ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Epoxy Resin ◽  
Bonding Strength ◽  
Interfacial Bonding ◽  
Epoxy Composites ◽  
Simple Method ◽  
Nano Scale ◽  
Interfacial Bonding Strength ◽  
Nano Size ◽  
Epoxy Emulsion

A simple method to prepare emulsifier was proposed to form stable nano size emulsion as sizing agent to enhance the interfacial bonding strength between carbon fiber (CF) and epoxy resin....

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