Effects of nano-silver and nano-zycosil on mechanical strength of heat, vapor, and dry-ice-treated biscuit and dovetail medium-density fiberboard miter joints (original) (raw)
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Effects of Adding Silver Nanoparticles on the Bonding of Adhesive System to Cement Glass Fiber Posts
Egyptian Dental Journal
Objective: The present study was conducted to evaluate effects of adding silver nanoparticles with 0.5% nanoparticles on the bonding of adhesive system to cement glass fiber posts. Materials and methods: Twenty human maxillary canines were selected, the coronal portion was sectioned and teeth were endodontically instrumented and obturated with gutta percha. Gutta percha was removed using Largo drills, and then root canal walls of each sample were enlarged with the low-speed burs provided by the manufacturers. The depth of the post space preparation was 10 mm, measured from the cementoenamel junction. The samples were randomly divided into two groups according to adhesive system used. Group A: Adhesive system without additives and Group B: Adhesive system containing 0.5%nanoparticles of silver (NAg). Clearfil SE bond applied without and with additives of (NAg) then cured for 20 seconds using light emitting diodes. RelyX ARC resin cement was introduced into canal and posts were positioned and light-cured for 40 seconds then tensile test was done and recorded values of bond strengths in (MPa) were collected, tabulated and statistically analyzed. One way analysis of variance (ANOVA) and Tukey's tests were used for testing the significance between the means of tested groups which are statistically significant when the P value ≤ 0.05. Results: Tensile strength of adhesive system containing (NAg) (group B) [11.42MPa] had a statistically higher value than adhesive system without (NAg) (group A) [7.99MPa]. Conclusions: The results indicate that (NAg) with concentration 0.5% increase tensile bond strength of the adhesive system.
Mechanics of Advanced Materials and Structures, 2018
In this study, the shear strength of a nanocomposite adhesive was experimentally and numerically investigated under ambient temperature and thermal cycling conditions. This study used the Thick Adherend Shear Test method, which is commonly used to determine the shear stress-displacement of adhesives. Shear-displacement was determined by an extensometer to accurately compare results obtained from the Thick Adherend Shear Test results for joints with numerical analyses. As a result, when the shear failure load obtained from experiments was examined, the nanocomposite adhesives, obtained by adding a nanostructure into the adhesive, improved both the ambient temperature and thermal cycling performances of the joints.
Mechanical properties of nano-silver joints as die attach materials
This review traces the development of silver (Ag) as a die attach bonding material in the microelectronic packaging industry from its' early days as micron-scale silver flakes to the recent nanoscale Ag paste and other derivatives. Basic materials properties include the composition of Ag pastes, the methods of producing Ag nanoparticles, and product applications will be presented. Key processing conditions will be discussed to elucidate different factors which influence the mechanical properties of nano-Ag joints, principally the tensile and shear strength as well as thermal fatigue properties. Success in implementing nano-scale Ag pastes could only have been possible by deriving a fundamental understanding developed in the field of processing and using ceramic and metallic nano-powders.
Effect of silver nanoparticles on hardness in medium-density fiberboard (MDF)
iForest - Biogeosciences and Forestry, 2015
Effect of silver nanoparticles on hardness in medium-density fiberboard (MDF) was studied here. A 400 ppm aqueous nanosilver suspension was used at three consumption levels of 100, 150, and 200 mL kg-1 , based on the dry weight of wood fibers; the results were then compared with the control panels. The size range of silver nanoparticles was 30-80 nm. Composite mats were hot-pressed for 6, 8, and 10 min. Results showed that the uniform and even dispersion of nanoparticles throughout the MDF-matrix significantly contributed to an increase in the hardness at lower hot-press time of 6 min. In the longer hot-press times, however, overheating of the mat resulted in significant a decrease of hardness values. Significant high correlation was observed between water absorption and thickness swelling.
Influence of nano toughened epoxies in the bonding characteristics of adhesive joints
Adhesive joints are proving to be an excellent solution for joining similar or dissimilar substrates due to their elevated and enhanced bonding characteristics. They are found to frequently replace the traditional joints due to their ability to distribute load. Hence, the substantiation of the joint strength lies in the strengthening of the adhesion characteristics. Among the many parameters which promote the adhesive strengthening, the fusion of nano particles (NPs) has occupied a prominent area of research due to their promotional ability to enhance the mechanical properties of the joint. Hence the need is there to conduct a comprehensive review into the types of NPs, methodologies of dispersion, the % by wt of NP addition, and the changes that take place in the mechanical and chemical perspectives in the adhesive layer as well as the interface zones between the adhesive and the substrate. So, the paper is committed to conduct a comprehensive but relevant review in this direction of adhesive strengthening paving the way for adhesive joint strength substantiation.
International Journal of Adhesion and Adhesives, 2013
Growing usage of lightweight materials such as Al and Mg alloys and composites in automotive body manufacturing has come to a point that bonding of dissimilar materials is a realistic problem to address. A significant issue related to the bonding of dissimilar materials is that the differences in substrate surface conditions, substrate chemical and physical properties often lead to bond failure at strength levels far less than the bond strength established by the adhesive manufacturer for a balanced joint. This research experimentally studied several important factors influencing initial shear strengths and hygrothermal degradation of adhesively-bonded single lap shear (SLS) joints. The effects of surface treatments such as lubrication and zinc coating on the substrates were first investigated. It was observed that even a very small change in the amount of lubricant applied to an aluminum alloy affected the initial shear strength. On the other hand, varying the amount of mill oil on a galvanized steel surface had little effect. Next, the comparative study of the initial joint strength between electrogalvanized (EG) steels and hot dipped galvanized (HDG) steels revealed that the two coatings exhibited no difference in terms of the initial strength. Also, various combinations of aluminum alloys and steel substrates were studied to observe the effect of substrate materials. It revealed that the strength of a dissimilar joint constructed of a strong substrate and relatively weak substrate fell below the strength of the like-material joint made of the relatively strong substrate, and was closer to the strength of the like-material joint composed of the relatively weak substrate. Ageing tests were performed on SLS joints at various temperatures with and without humidity. The shear strength barely changed after 60-days of exposure at various temperatures with room humidity, but degraded significantly at high temperature with high humidity.
Effect of Nanofillers on Adhesive Toughness Measurement
2020
Joining can be defined as a process to bond two or more parts together. In engineering, joining types are one of the most crucial part in manufacturing decision and therefore significant in design. There are a lot to be considered by engineers for the methods in assembling parts into product where it is related with the manufacturing cost, performance of product and the impact of the end product’s weight. Few things related with the decision making is by making sure the availability of the equipment, skilled labor and also the energy and cost of materials [1-3]. Basically there are three classifications of joining for assembly and joining of engineering components which are by mechanical, chemical and physical. Mechanical joining methods are usually based on localized, point-attachment process where the joint is provided by a rivet, nail, bolt or screw [4]. The joints are depending on the tensile stresses in the attachment where the components are being hold in compression. For chem...
Composites Part B: Engineering, 2019
In this study, single lap joints were formed by adding nano-Al 2 O 3 , nano-TiO 2 and nano-Al 2 O 3 powders in various proportions to the epoxy adhesive and using the additive-free epoxy adhesive; and also the mechanical properties of the connections were experimentally investigated at 20, 25, 30, 50 and 70 mm overlap lengths under shear load. In the experimental work, DP460 epoxy adhesive was used as adhesive and AISI 304 stainless steel plate as adherent material. When the results obtained from the experiments were examined, it was revealed that the average damage load in connection with the use of nanoparticle-added adhesives increased considerably in general. As a result of the experiments, the most effective nanoparticle in increasing the failure strength of the adhesive joints with nano-Al 2 O 3 particles and the maximum failure strength increase rate was 20 mm in overlap length and 97% in 4 wt% nano-Al 2 O 3 reinforced specimens. It was also found that the nanoparticle strain was an important parameter in the tensile strength of the adhesive joints. In addition, it has been found that the addition of nanoparticles into the adhesive increases the elongation of the joints. When the adhesion surfaces of the samples were examined as in the case of plain adhesives, damage was observed as adhesion separation while nanoparticle reinforcement was observed as a mixture of adhesion and cohesion.
Research on strength of nanocomposite adhesively bonded composite joints
Composites Part B: Engineering, 2017
Due to their great advantages, adhesively bonded joints are frequently used in many areas like automotive, marine, space and aerospace industries. Especially findings from nanoscience and nanotechnology, which have progressed significantly in recent years, influence adhesives sciences significantly as well as other disciplines. In the present study, nanoparticles were added to the adhesive to increase the damage load of adhesively bonded single lap composite joints and tensile and bending moment damage loads of these joints were experimentally investigated. In the study, carbon fiber fabric reinforced composites (0/90) with Plain Weave were used as the adherend; rigid, tough and flexible adhesive types were used as the adhesive and 1 wt% Graphene-COOH, Carbon Nanotube-COOH and Fullerene C60 were used as the nanoparticles. As a result, based on the AA2024-T3 aluminum alloy used in a study conducted by Akpinar et al. [1], the use of carbon fiber fabric reinforced composites as the adherend considerably increases the damage load of the joint, depending on the adhesive type. Moreover, when failure loads obtained from experiments were examined, the addition of nanoparticles to the adhesive was shown to increase the tensile and four-point bending damage load of joint, depending on the adhesive and nanoparticle type.