Characterization of macro-defect-free processing in a Banburry-type mixer

1994 ◽  
Vol 52 ◽  
pp. 650-651
Author(s):  
M. A. Gulgun ◽  
W.M. Kriven
Keyword(s):  
Composite Material ◽  
Processing Time ◽  
Organic Matrix ◽  
Time Interval ◽  
Viscoplastic Flow ◽  
Shear Mixing ◽  
Standard Composition ◽  
Mixed Batch ◽  
Type Mixer

Macro-defect-free cement (MDF) is a composite material consisting of a tightly bound network of inorganic calcium aluminate (CA) cement grains embedded in an polyvinyl alcohol (PVA) organic matrix. The standard composition starts with a mixed batch made of 83.8 wt% CA, 5.9 wt% partially hydrolyzed PVA, 9.6 wt% water and 0.6 wt% glycerine. The damp powder is further shear-mixed in a Banburry type mixer. During this step, the mix converts into a dough-like, viscoplastic paste which further can be processed by extrusion or molding to a desired shape. Viscoplastic paste formation is a crucial stage in processing and results from mechano-chemical (i.e. mechanically assisted) reactions between the polymer and the hydrating cement phases. The viscoplastic flow is only observed within a certain processing time interval, i.e. window of processability (Regions II and III in Fig. 1). Prolonged shear mixing reverts the system back into a friable, powdery mass. The rheology of the composite paste is monitored in terms of the torque required to flow the mix at a constant rpm.

Preparation and characterization of SiC-ZAC composite material for immobilizing the simulated radioactive graphite

2021 ◽  
pp. 104029
Author(s):  
Mingliang Ye ◽  
Yuancheng Teng ◽  
Xiaofeng Zhao ◽  
Shanlin Wang ◽  
Jiayuan Tang ◽  
...  
Keyword(s):  
Composite Material ◽  
Radioactive Graphite

Obtention of an Al-Based Composite Material by Direct Fusion of Used Beverage Cans

2012 ◽  
Vol 706-709 ◽  
pp. 271-276 ◽  
Author(s):  
Claudia Carrasco ◽  
C. Montalba ◽  
Carlos Camurri
Keyword(s):  
Composite Material ◽  
Aluminium Alloys ◽  
Metal Matrix ◽  
Mechanical Analysis ◽  
Heat Treated ◽  
Structural Applications ◽  
Metal Matrix Composite Material ◽  
Direct Fusion ◽  
Scanning Electron

In the present study, the fabrication of an Al-based metal matrix composite material obtained directly from the melting of the aluminium used beverage cans in a modified rheocasting process is presented. The analysed operational condition is the shear rate applied to the bath and its influence on the properties of the obtained samples. Additionally, samples were heat treated at two different times. The characterization of the phases obtained in Al-based MMC was made by means of metallography, scanning electron microscopy with energy dispersive spectroscopy and electron microprobe with wavelength dispersion spectroscopy. The results show that some constituents were formed during the fabrication process of the MMC, mainly Al6(Fe, Mn), which are partially transformed during the heat treatment. Additionally, samples were evaluated using dynamic mechanical analysis, and the results suggest that the obtained MMC could have very good mechanical properties, similar or superior to the aluminium alloys commonly used for structural applications such as 6XXX family.

scholarly journals Development and Characterization of Teflon-Copper Composite Material

2018 ◽  
Vol 778 ◽  
pp. 225-229
Author(s):  
Imran Hamid ◽  
Abdul Rauf ◽  
Faisal Nasim ◽  
Muhammad Siddique ◽  
Adnan Gul
Keyword(s):  
Composite Material ◽  
Hot Isostatic Pressing ◽  
Solid Lubricants ◽  
Powder Metallurgy Technique ◽  
Covalent Bonds ◽  
Secondary Bonds ◽  
Three Samples ◽  
Commercial Applications ◽  
Copper Composite

Composites are the combination of materials that are mixed together to achieve specific structural properties. Teflon (Polytetrafluoroethylene PTFE) consists of long-chain molecular structure. Its monomer consists of two carbon atoms each of them having flourine atoms attached. Bonds within each chain are strong covalent bonds where as the secondary bonds between two chains are weaker. By raising temperature, the distance between the chains increases providing good adjustment of the atoms of other materials due to anisotropy of its mechanical properties. Powder metallurgy technique using hot isostatic pressing, a hybrid densification process in which pressure and temperature are applied at the same time, has been used to develop a teflon-copper composite material. Three samples were prepared by changing the teflon-copper composition as 60:40%, 65:35% and 70:30% by weight. Commercially available powders of teflon and copper of grain size ~ 40 μm was used. The aim to develop this type of material was to increase its density (~ 4 g/cm3), and hardness. The commercial applications of such type of composite material are solid lubricants, sleeves, bearings etc. In this paper the effect of composition on hardness, tensile strength and surface roughness is studied.

scholarly journals Characterization of interface irradiation damage in Ti-clad V-4Cr-4Ti composite material

2019 ◽  
Vol 68 (21) ◽  
pp. 216101
Author(s):  
Ran-Ran Li ◽  
Yi-Fan Zhang ◽  
Dian-Cheng Geng ◽  
Gao-Wei Zhang ◽  
Hideo Watanabe ◽  
...  
Keyword(s):  
Composite Material ◽  
Irradiation Damage

Neutron Diffraction Study of a New Generation of Implants

2008 ◽  
Vol 571-572 ◽  
pp. 163-168
Author(s):  
Abdelilah Benmarouane ◽  
Helene Citterio-Bigot ◽  
T. Hansen ◽  
Pierre Millet ◽  
Alain Lodini
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Neutron Diffraction ◽  
Diffraction Study ◽  
Thermal Spraying ◽  
Organic Matrix ◽  
Neutron Diffraction Study ◽  
Mineral Phase ◽  
New Generation ◽  
Strength And Ductility

In recent years, nanostructured coatings by Plasma Thermal Spraying (PTS) attracted intense interest due to their enhanced mechanical properties as hardness, strength and ductility. The aim of this study was to evaluate the influence of coating the implant by nanohydroxyaptite, n-HAp, Ca10 (PO4)6(OH)2. The results obtained with n-HAp will also compared with the implant coated with HAp. Bone is a composite material in which are associated a mineral phase in the form of crystals of HAp and an organic matrix constituted by collagen. The c-axes of HAp and the collagen fibers are preferentially oriented in the direction of the stresses that the bones need to withstand. At the interface implant-bone, the new bone reconstituted after implantation must have the same proprieties of the original bone in order to have good fixation with the implant. Therefore, it is necessary to study the mechanical properties of this new bone crystals reconstituted at the interface with the implants coated with n-HAp and HAp by neutrons diffraction on D20 at ILL.

Enhancement of the Photovoltaic Potential in Mimosa Pudica-Based Dye for Sensitization of the Working Electrode in the Construction of Solar Cell

2021 ◽  
pp. 1-21
Author(s):  
Manasseh B. Shitta ◽  
Emmanuel O.B. Ogedengbe ◽  
Oluwole B. Familoni ◽  
Oluwatoyin T. Ogundipe
Keyword(s):  
Solar Cell ◽  
Conversion Efficiency ◽  
Organic Matrix ◽  
Tio2 Layer ◽  
Mimosa Pudica ◽  
Solar Module ◽  
Renewable Power ◽  
Diffusion Characteristics ◽  
In Series

Abstract The potential enhancement of extract from Mimosa pudica (M.pudica) leaf for sensitizing TiO2 layer towards the production of organic solar cell is investigated. A unique diffusion model that incorporates the concentration of the extract in the TiO2 layer is adopted. The diffusion characterization of the extract into the TiO2 provides a proper understanding of the dynamics of the extract within the layer. This research applies the combination of experimental and numerical techniques towards the investigation of the diffusion characteristics in Mimosa pudica extract. Experimental chromatograph of the extract is conducted in order to reveal the properties and concentration of the extract. Three different thickness of TiO2 deposit, and are sensitized at different hours in order to monitor the absorbance. Using the finite volume method (FVM), the adsorption and diffusion characteristics of the extract into the layer of TiO2 are modelled. The current voltage characteristics of the cell are combined in series as a standard module and its application modelled in an audited office space. The cell area characterised is 0.3848 cm2, the conversion efficiency of 1.35 % is obtained. The concentration model of the extract in TiO2 and the entrance velocity is presented. The experimental and numerical results compared favourably. However, it is anticipated that additional taxonomical characterization of M.pudica and advanced investigation into organic matrix composite will provide a useful guide for the synthesis of the natural dye and enhance the conversion efficiency of the solar module for renewable power generation.

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