scholarly journals Green Sound-Absorbing Composite Materials of Various Structure and Profiling

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 407
Author(s):  
Eulalia Gliscinska ◽  
Javier Perez de Amezaga ◽  
Marina Michalak ◽  
Izabella Krucinska
Keyword(s):  
Sound Wave ◽  
Sound Absorption ◽  
Raw Materials ◽  
Matrix Material ◽  
Composite Layer ◽  
Renewable Raw Materials ◽  
Flax Fibers ◽  
The Matrix ◽  
Reinforcing Material ◽  
Positive Effect

This article presents thermoplastic sound-absorbing composites manufactured on the basis of renewable raw materials. Both the reinforcing material and the matrix material were biodegradable and used in the form of fibers. In order to mix flax fibers with polylactide fibers, the fleece was fabricated with a mechanical system and then needle-punched. The sound absorption of composites obtained from a multilayer structure of nonwovens pressed at different conditions was investigated. The sound absorption coefficient in the frequency ranging from 500 Hz to 6400 Hz was determined using a Kundt tube. The tests were performed for flat composites with various structures, profiled composites, and composite/pre-pressed nonwoven systems. Profiling the composite plate by convexity/concavity has a positive effect on its sound absorption. It is also important to arrange the plate with the appropriate structure for the incident sound wave. For the composite layer with an added pre-pressed nonwoven layer, a greater increase in sound absorption occurs for the system when a rigid composite layer is located on the side of the incident sound wave. The addition of successive nonwoven layers not only increases the absorption but also extends the maximum absorption range from the highest frequencies towards the lower frequencies.

Enhancement of Mechanical Properties by Reinforcing Magnesium With Ni-Coated Carbon Nanotubes

2010 ◽  
Author(s):  
M. H. Nai ◽  
C. S. Goh ◽  
S. M. L. Nai ◽  
J. Wei ◽  
M. Gupta
Keyword(s):  
Carbon Nanotubes ◽  
Load Transfer ◽  
Matrix Material ◽  
Strength Based ◽  
The Matrix ◽  
Rapid Sintering ◽  
Reinforcing Material ◽  
Coated Carbon ◽  
Strength And Ductility ◽  
Walled Cnts

In this study, carbon nanotubes (CNTs) are coated with nickel (Ni) to improve the wettability of the CNT surface and metal matrix, and allow an effective load transfer from the matrix to nanotubes. Pure magnesium is used as the matrix material and different weight percentages of Ni-coated multi-walled CNTs are incorporated as the reinforcing material. The nanocomposite materials are synthesized using the powder metallurgy route followed by microwave assisted rapid sintering. Mechanical property characterizations reveal an improvement of 0.2% yield strength, ultimate tensile strength and ductility with the addition of Ni-CNTs. As such, Ni-coated CNTs can be used as a reinforcement in magnesium to improve the formability of the material for light-weight, strength-based applications.

scholarly journals Particularities of structure formation of aluminum-copper composite materials manufactured by casting technology

2020 ◽  
pp. 116-121
Author(s):  
V. A. Kalinichenko ◽  
A. S. Kalinichenko ◽  
S. V. Grigoriev
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Structure Formation ◽  
Matrix Material ◽  
Matrix Alloy ◽  
Alloying Elements ◽  
Casting Technology ◽  
The Matrix ◽  
Reinforcing Material ◽  
Copper Composite

To create friction pairs operating in severe working conditions, composite materials are now increasingly used. Composite materials obtained with the use of casting technologies are of interest due to the possibility to manufacture wide range of compositions at low price compared to powder metallurgy. Despite the fact that many composite materials have been sufficiently studied, it is of interest to develop new areas of application and give them the properties required by the consumer. In the present work the composite materials on the basis of silumin reinforced with copper granules were considered. Attention was paid to the interaction between the matrix alloy and the reinforcing phase material as determining the properties of the composite material. The analysis of distribution of the basic alloying elements in volume of composite material and also in zones of the interphases interaction is carried out. The analysis of the possibility of obtaining a strong interphase zone of contact between the reinforcing component and the matrix material without significant dissolution of the reinforcing material is carried out.

Study on Alloyed Surface Layer of Wear Resistant Castings by Evaporable Pattern Castings Infiltration Process

2012 ◽  
Vol 538-541 ◽  
pp. 247-250
Author(s):  
Da Chun Yang
Keyword(s):  
Low Cost ◽  
Matrix Material ◽  
Composite Layer ◽  
Boron Steel ◽  
Infiltration Process ◽  
Wear Resistant ◽  
Forming Mechanism ◽  
The Matrix ◽  
Alloyed Surface ◽  
High Boron

Wear-resistant casting was made by V-EPC infiltration process. This paper puts forward and analyses the mechanical properties and forming mechanism of the layer. The matrix material was high boron steel casting. By partial casting alloyed, the surface composite materials layer was ceramic particles, such as WC, Ferrochromium, and Borax, etc. High boron molten metal was infiltrated into the composite layer and a good cast-infiltration layer may be formed by the interaction of vacuum and high temperature. The test result shows that using this process we can get the casting surface which is special abrasion-resistance with the remarkable characteristics such as simple process and low cost. It is a new process that wear-resistant casting will be made of.

The role of hollow silica nanospheres and rigid silica nanoparticles on acoustic wave absorption of flexible polyurethane foam nanocomposites

2019 ◽  
Vol 56 (4) ◽  
pp. 395-410
Author(s):  
Zohreh Zangiabadi ◽  
Mohammad Jafar Hadianfard
Keyword(s):  
Absorption Coefficient ◽  
Silica Nanoparticles ◽  
Polyurethane Foam ◽  
Sound Wave ◽  
Sound Absorption ◽  
Sound Absorption Coefficient ◽  
Silica Nanospheres ◽  
Hollow Silica ◽  
The Matrix ◽  
Hollow Silica Nanospheres

Pure polyurethane foam and nanocomposite foam are used to absorb sound. In this study, hollow silica nanospheres and rigid silica nanoparticles were added to the polyurethane matrix and their sound absorption properties were investigated by impedance tube and compared with pure polyurethane foam. Reinforcement phase influences on the morphology of the matrix were studied by scanning electron microscopy. Due to greater effects of the rigid silica nanoparticles on the morphology of the matrix, it was expected to increase the sound absorption coefficient of the rigid silica nanoparticles/polyurethane, more than hollow silica nanospheres/polyurethane, but the results show that the hollow silica nanospheres increased absorption coefficient of the composite more efficiently. The crust of hollow silica nanospheres increases the number of boundaries in a sound wave, and the air gap inside them cause the sound wave to damp. So the intrinsic property of the hollow silica nanospheres is more effective than the matrix morphology. Thus, by the same content of reinforcement in the matrix, hollow silica nanosphere/polyurethane sample with sound absorption coefficient of 0.87 for a thickness of 9 cm has the highest sound absorption coefficient compared to the rigid silica nanoparticles/polyurethane sample and pure polyurethane foam. In pure and nanocomposite samples, sound absorption coefficient increased by increasing the thickness of samples.

scholarly journals All-Cellulose Composites: A Review of Recent Studies on Structure, Properties and Applications

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2836
Author(s):  
Behnaz Baghaei ◽  
Mikael Skrifvars
Keyword(s):  
Fossil Fuels ◽  
Raw Materials ◽  
Regenerated Cellulose ◽  
Renewable Raw Materials ◽  
Cellulose Composites ◽  
Significant Research ◽  
The Matrix ◽  
Potential Applications ◽  
Processing Techniques ◽  
Vital Resource

Nowadays, there is greater demand for greener materials in societies due to environmental consciousness, depleting fossil fuels and growing ecological concerns. Within the foreseeable future, industries and suppliers will be required to be more aware of challenges faced due to the availability of resources and use more sustainable and renewable raw materials. In this context, cellulose can be expected to become a vital resource for materials owing to its abundance, versatility as a biopolymer, several different forms and potential applications. Thus, all-cellulose composites (ACCs) have gained significant research interest in recent years. ACC is a class of biocomposites in which the matrix is a dissolved and regenerated cellulose, while the reinforcement is undissolved or partly dissolved cellulose. This review paper is intended to provide a brief outline of works that cover recent progress in the manufacturing and processing techniques for ACCs, various cellulose sources, solvents and antisolvents, as well as their properties.

scholarly journals Composites Based on Alternative Raw Materials at High Temperature Conditions

2017 ◽  
Author(s):  
Tomáš Melichar ◽  
Jiří Bydžovský ◽  
Ámos Dufka
Keyword(s):  
High Temperature ◽  
Fly Ash ◽  
Composite Structures ◽  
Raw Materials ◽  
Analytical Techniques ◽  
Temperature Changes ◽  
Dimensional Changes ◽  
Transition Zones ◽  
The Matrix ◽  
Positive Effect

This paper presents newly developed polymer-cement composites.The primary binder (cement) was partially substituted byuse of blast-furnace slag and high-temperature fly ash. A lightweightaggregate – agloporite (grain size in range 1–2 mm) wasused among other components. This porous aggregate is producedfrom energy by-products (fly ash). Attention was focusedon the behavior of the composites when exposed to elevatedtemperatures (400 °C–1,000°C). The influence of several differentmethods of temperature decrease was assessed – slow(in furnace 1°C/min) and rapid (laboratory ambient 22°C andwater bath 18°C). Specific dimensional changes were determined,including strength characteristics and bulk density.Structural deterioration and microstructural changes of selectedspecimens were investigated by analytical techniques (SEM andCT). Compressive and bending tensile strength changed variouslydepending on temperature changes, including severalcooling conditions. Deterioration reactions (especially cracks)which were formed in investigated composite structures correspondedwith results of physico-mechanical testing. That wasconfirmed by using the CT and SEM.The fact that the agloporite has a positive effect on thermalresistance of developed polymer-cement composites wasproved. Almost no cracks or other failures were identified (byusing CT and SEM) in interfacial transition zones of agloporiteafter thermal stress. This indicates very good bond adhesionbetween the matrix and the porous aggregates during extremetemperature conditions (in case of different cooling methods).

scholarly journals Specific of Hemp Fiber ’ S Plastic Composite Projection

2015 ◽  
Vol 1 ◽  
pp. 310 ◽  
Author(s):  
Edgars Kirilovs ◽  
Rita Soliženko ◽  
Silvija Kukle
Keyword(s):  
Product Life Cycle ◽  
Raw Materials ◽  
Low Cost ◽  
Matrix Material ◽  
Resource Depletion ◽  
Renewable Resource ◽  
Hydroxyl Group ◽  
Hemp Fiber ◽  
Plastic Composite ◽  
The Matrix

In the report there are reflected research results of new board type biocomposites creation for furniture and equipment manufacturing for public segment, replacing traditional petroleum-based components with fully or partly renewable, biodegradable raw materials as one of the major global environmental problems today is non-renewable resource depletion and waste of petroleum-based plastic products. Performed research of biopolymer composites development shows that they are cheaper, environmentally friendlier, lighter, more easily to recycle and to dispose at the end of the product life cycle. For biopolymer’s reinforcement industrial flax and hemp fibers in terms of mechanical qualities are competitive with the glass fiber, they are strong enough in many applications, CO2 neutral, have a relatively low cost, low production energy requirements. By creating new biocomposites it is taken into account that the designed material mechanical properties are mainly dependent on the fiber mass in the matrix, orientation and adhesion to the matrix material. The maximum theoretical amount of fiber weight in composite can reach 91%, specific weight of the fiber component used in practice is usually between 45-65%, but can reach also 70%. For improvement of the adhesion the chemical treatment and drying of the fibers need to be done, also adjuvants that promote development of the hydroxyl group links should be incorporated in the matrix.

Effects of the Microstructure and Mechanical Properties for Wear Resistant Casting Surface with Vacuum Evaporable Pattern Casting Infiltration Process

2011 ◽  
Vol 291-294 ◽  
pp. 176-179
Author(s):  
Da Chun Yang
Keyword(s):  
Matrix Material ◽  
Composite Layer ◽  
High Strength ◽  
Boron Steel ◽  
Casting Surface ◽  
Infiltration Process ◽  
Wear Resistant ◽  
New Process ◽  
The Matrix ◽  
High Boron

Wear-resistant casting was made by V-EPC infiltration process. The matrix material was high boron steel casting. Surface composite materials layer was ceramic particles, such as WC, Ferrochromium, and Borax, etc. High boron molten metal was infiltrated into the composite layer and a good cast-infiltration layer may be formed by the interaction of vacuum and high temperature. The wear-resistant casting made with this process has high strength, hardness, and good wear-resistance. It is a new process that wear-resistant casting will be made of.

scholarly journals Titanium Carbide: Synthesis, Properties and Applications

2020 ◽  
Vol 2 (2) ◽  
pp. 1-11
Author(s):  
Mohsen Mhadhbi
Keyword(s):  
Composite Materials ◽  
Titanium Carbide ◽  
Matrix Material ◽  
Industrial Applications ◽  
Carbide Powder ◽  
Synthesis Properties ◽  
The Matrix ◽  
Different Shapes ◽  
Reinforcing Material ◽  
Short Time

Composite materials are known in various forms. The two distinctive constituents of these composite materials are the matrix material and the reinforcement material. A variety of materials are used as reinforcing material in composites titanium carbide (TiC). TiC acquired considerable attention because of its unique properties, which make it very attractive for advanced applications. The current review summarizes various synthesis techniques to produce TiC nanocomposite and highlights the major industrial applications of TiC. It was found that for certain techniques, the TiC powder has been synthesized directly, with different shapes and sizes, within a relatively very short time by eliminating a number of intermediate processes. However, this review deals with the detailed literature survey carried out on the preparation of titanium carbide powder, and also covers analyzes the results from the experiments conducted on the preparation of powder by the works of several researchers. Therefore, in-depth conclusions have been done on the research processes that are being carried out on improving the properties of TiC reinforced composites.

Fabrication and Characterization of CU/B4C Surface Dispersion Strengthened Composite using Friction Stir Processing

2014 ◽  
Vol 59 (1) ◽  
pp. 83-87 ◽  
Author(s):  
R. Sathiskumar ◽  
N. Murugan ◽  
I. Dinaharan ◽  
S.J. Vijay
Keyword(s):  
Friction Stir Processing ◽  
Matrix Material ◽  
Composite Layer ◽  
Copper Surface ◽  
Chromium Steel ◽  
Copper Plate ◽  
Homogeneous Distribution ◽  
Scanning Electron Micrographs ◽  
Friction Stir ◽  
The Matrix

Abstract Friction stir processing has evolved as a novel method to fabricate surface metal matrix composites. The feasibility to make B4C particulate reinforced copper surface matrix composite is detailed in this paper. The B4C powders were compacted into a groove of width 0.5 mm and depth 5 mm on a 9.5 mm thick copper plate. A tool made of high carbon high chromium steel; oil hardened to 63 HRC, having cylindrical profile was used in this study. A single pass friction stir processing was carried out using a tool rotational speed of 1500 rpm, processing speed of 40 mm/min and axial force of 10 kN. A defect free interface between the matrix and the composite layer was achieved. The optical and scanning electron micrographs revealed a homogeneous distribution of B4C particles which were well bonded with the matrix. The hardness of the friction stir processed zone increased by 26% higher to that of the matrix material.

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