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Articles 1 - 30 of 54
Full-Text Articles in Materials Science and Engineering
Thermal Characterisation Of Poly(Methyl Methacrylate) Filled With Barium Titanate As Denture Base Material, Nidal Elshereksi
Thermal Characterisation Of Poly(Methyl Methacrylate) Filled With Barium Titanate As Denture Base Material, Nidal Elshereksi
Nidal Elshereksi
No abstract provided.
Application Of Fly-Ash Composite In Plasma Surface Engineering, Ajit Behera
Application Of Fly-Ash Composite In Plasma Surface Engineering, Ajit Behera
Ajit Behera
Fly-ash produced from iron & steel industries contains rich amount of metal oxides which gives a tremendous potential as a coating material on structural components. This demand leads to develop and characterize different type of fly ash composite coatings by using plasma spray technique. Plasma spray technology has the advantage of being able to process various low-grade ore minerals to obtain value-added products and also to deposit metals, ceramics and a combination of these, generating approximately homogeneous coatings with the desired microstructure. In the present investigation, coatings are developed on copper substrates using fly-ash+ quartz+ illmenite composite (in a weight …
Coating Material Interaction On Metal Substrate By Application Of Plasma Spraying, Ajit Behera
Coating Material Interaction On Metal Substrate By Application Of Plasma Spraying, Ajit Behera
Ajit Behera
In this paper, Fly-ash+quartz+illmenite with weight percentage ratio: 60:20:20, is deposited on mild steel and copper substrates by atmospheric plasma spraying at various operating power level ranging from 11 to 21 kW. The properties of the coating depend on the interaction of coating powder with plasma, operating condition and the process parameters. The coating quality and behavior depends on Coating surface & interface morphology are studied with Scanning Electron Microscope. For Mild Steel the adhesion strength has varied from 3.5MPa to 6.56MPa and for Mild steel a maximum of 6.56MPa at the power level of 21 kW. In plasma spraying, …
Application Of Neural Network Analysis To Correlate The Properties Of Plasma Spray Coating, Ajit Behera
Application Of Neural Network Analysis To Correlate The Properties Of Plasma Spray Coating, Ajit Behera
Ajit Behera
Thermal spray coatings are more often being demanding process at the recent stages of industrial design processes to become fundamental element of the engineering system. The aim of the present paper is to develop a model-based estimation and control for regulating the coating adhesion strength, by using neural network. This proposed model permits cost reduction by the possibility of adjusting the parameter of the process for each of the desired properties, which can directly act as a quality control process. By this artificial neural network (ANN) technique, the possibility of adhesion strength of the mixture of flyash, quartz and illmenite …
Least Square Support Vector Machine Alternative To Artificial Neural Network For Prediction Of Surface Roughness And Porosity Of Plasma Sprayed Copper Substrates, Ajit Behera
Ajit Behera
Plasma spraying technique has become a subject of intense research in many industrial structural/functional applications because its peculiarity surface properties. This investigation explains about plasma sprayed copper surface property. Here industrial waste and low grade ore (i.e. Flay-ash+ quartz+ illmenite), used as deposit material which is to be coated on copper substrates. In many applications, it is found that for structural modification, surface roughness & porosity parameters are very important. To decrease both surface roughness and coating porosity by optimizing other necessary properties, different soft computing methods like Artificial Neural Network (ANN) and Least Square support vector machine techniques used. …
A Novel Material Used In Automotive Industry: Compacted Graphite Iron, Ajit Behera
A Novel Material Used In Automotive Industry: Compacted Graphite Iron, Ajit Behera
Ajit Behera
In recent decades, materials have been a key to increase the performance of automotive parts which leads to development of new materials. The main objective is to achieve increase in quantity and quality of automotive parts produced with optimum performance during their life cycle. Cast iron has remained a competitive material due, in part, to its low production cost. In fact, among the cast iron group, one of the alternatives is lightweight alloys, that is, compacted graphite iron (CGI). Nowadays, it is accepted that CGI can effectively reduce the total weight of an automobile by virtue of its high strength- …
Sound Absorption Properties Of Functionally Graded Polyurethane Foams, Olivier Doutres Ph.D., Noureddine Atalla Pr.
Sound Absorption Properties Of Functionally Graded Polyurethane Foams, Olivier Doutres Ph.D., Noureddine Atalla Pr.
Olivier Doutres Ph.D.
Noise control over a wide frequency band is an increasingly important design criterion in the building and transport industries. Examples of well known broadband passive concepts for optimal sound absorption are multi-layering with graded properties across the thickness and optimization of the material shape (e.g., wedges). However, for typical applications, the material thickness is limited and shaping or use of different material costly. Thus, there is growing interest for developing acoustical materials having microstructure properties gradient at the micro- or meso-scale; also known as Functionally Graded Materials (FGM). Even if sophisticated models are available to predict the acoustic behavior of …
Classification Of Biomaterials Used In Medicine, Ajit Behera
Classification Of Biomaterials Used In Medicine, Ajit Behera
Ajit Behera
In this decade many researches are potentially going forward by using biomaterials in the medical field. Biomaterials can used in living creature body, taking in account of there biocompatibility. This paper describes about classification of different biomaterials which are used in medical industries. Advances in surgical technique and instruments have permitted materials to be used in ways that were not possible previously. Bio-material can partially/totally replaces one or more part of the body. Before using biomaterials, it should in mind that, which categories they are belongs and main focuses are on biocompatibility, bioinert, bioactive/surface reactive, biodegradable, sterilizability, adequate mechanical and …
Comparative Study Of Cryo -Treated Steel, Ajit Behera
Comparative Study Of Cryo -Treated Steel, Ajit Behera
Ajit Behera
— It is well known that most important problems faced by many industrial machine parts are the wear and tear which increases the cost of production and wasted time for the replacement process. Now-a-days cryogenic treatment would be regarded as one of the most important processes in the field of industries, and it is the ultra modern type of processing to make the metals more resistant to wear and more durable. Cryogenic treatment is an additional process to conventional heat treatment process. It involves freezing of materials at cryogenic temperatures to enhance the physical and mechanical properties of materials. This …
Characteristic Study On Ni50mn45sn5 By Dsc & X-Ray Analysis, Ajit Behera
Characteristic Study On Ni50mn45sn5 By Dsc & X-Ray Analysis, Ajit Behera
Ajit Behera
The Martensitic Transformation in Ferromagnetic shape memory alloys (FSMAs) can be triggered not only by changes in temperature and stress as that of paramagnetic conventional shape memory alloys, but also by changes in the applied magnetic field. It is well known that ferromagnetic shape memory alloy has diversified utilization, but not satisfactorily use, mainly because of high cost of processing and high cost of alloying elements. Among all Heusler alloy, Ni-Mn-Sn alloy have potential properties and exhibits lower cost. In this experiment Ni50Mn45Sn5 alloys characterize by using differential scanning calorimetric (DSC), optical microscope and X-Ray diffraction technique. The alloy undergoes …
A Semi-Empirical Model To Predict The Acoustic Behaviour Of Fully And Partially Reticulated Polyurethane Foams Based On Microstructure Properties, Olivier Doutres Ph.D., Noureddine Atalla
A Semi-Empirical Model To Predict The Acoustic Behaviour Of Fully And Partially Reticulated Polyurethane Foams Based On Microstructure Properties, Olivier Doutres Ph.D., Noureddine Atalla
Olivier Doutres Ph.D.
This work investigates the links between the microstructure of polyurethane foams and their sound absorbing efficiency, and more specifically the effect of membranes closing the cells. In a previous work, the authors proposed a semi-empirical approach to link the foam microstructure properties, i.e. reticulation rate, strut length and thickness, with its non-acoustic parameters. The study was based on the complete characterization of 15 isotropic polyurethane foams with various cell sizes and reticulation rates (i.e. open pore content). This paper proposes a validation of this semi-empirical model using 3 new polyurethane foams, not used in the first characterization set. More importantly, …
Dependence Of Adhesion Strength Of Plasma Spray On Coating Surface Properties, Ajit Behera
Dependence Of Adhesion Strength Of Plasma Spray On Coating Surface Properties, Ajit Behera
Ajit Behera
It is well known that thermal plasma spray coatings have diversified utilizations, but not vividly in use,mainly because of high cost of spray grade powder, for development of thick coating > 50 µm on metalsubstrates. Present investigation aims at depositing plasma spray coating on metals using low-cost/waste materials. A mixture of fly-ash + 20 weight percent of Quartz + 20 weight percent of illmeniteis used for coating on copper and mild steel substrates. The powder mixture is plasma sprayed bydifferent operating power levels (11 to 21 kW) of the plasma torch. The coatings are characterized for their adhesion strength, porosity and …
Utilization Of Mathematical Model To Understand Martensitic Transformation In Ferromagnetic Shape Memory Alloys, Ajit Behera
Utilization Of Mathematical Model To Understand Martensitic Transformation In Ferromagnetic Shape Memory Alloys, Ajit Behera
Ajit Behera
No abstract provided.
Local Non-Equilibrium Diffusion Model For Solute Trapping During Rapid Solidification, Sergey Sobolev
Local Non-Equilibrium Diffusion Model For Solute Trapping During Rapid Solidification, Sergey Sobolev
Sergey Sobolev
A local non-equilibrium diffusion model (LNDM) for rapid solidification of binary alloys has been briefly reviewed and used to modify a number of solute trapping models with different solid–liquid interface kinetics. The LNDM takes into account deviation from local equilibrium of a solute diffusion field in bulk liquid on the basis that the exact solutions to hyperbolic diffusion equations govern the solute concentration and solute flux in bulk liquid under local non-equilibrium conditions. The LNDM leads to a velocity-dependent effective diffusion coefficient in bulk liquid ahead of the solid–liquid interface, which goes to zero when the interface velocity goes to …
Rapid Colloidal Solidifications Under Local Nonequilibrium Diffusion Conditions, Sergey Sobolev
Rapid Colloidal Solidifications Under Local Nonequilibrium Diffusion Conditions, Sergey Sobolev
Sergey Sobolev
Partition coefficient for rapid solidification of colloidal suspensions has been calculated under local nonequilibrium diffusion conditions typically used when processing advanced materials. It has been demonstrated that the local nonequilibrium diffusion effects stabilize the planar solid liquid interface and lead to an abrupt transition to diffusionless solidification with complete particle trapping. The effective diffusion coefficient, which depends on interface velocity and particle size, has been introduced. It explains the strong dependences of the partition coefficient and the velocity leading to absolute stability of a planar solid–liquid interface on particle size.
An Analytical Model For Local-Nonequilibrium Solute Trapping During Rapid Solidification, Sergey Sobolev
An Analytical Model For Local-Nonequilibrium Solute Trapping During Rapid Solidification, Sergey Sobolev
Sergey Sobolev
Updated version of local non-equilibrium diffusion model (LNDM) for rapid solidification of binary alloys was considered. The LNDM takes into account deviation from local equilibrium of solute concentration and solute flux fields in bulk liquid. The exact solutions for solute concentration and flux in bulk liquid were obtained using hyperbolic diffusion equations. The results show the transition from diffusion-limited to purely thermally controlled solidification with effective diffusion coefficient D →0 and complete solute trapping K(v)→1 at V→VDb for any kind of solid-liquid interface kinetics. Critical parameter for diffusionless solidification and complete solute trapping is the diffusion speed in bulk liquid …
Analysis Of Martensitic Transformation In Ni-Mn-Sn Fsma, Ajit Behera
Analysis Of Martensitic Transformation In Ni-Mn-Sn Fsma, Ajit Behera
Ajit Behera
Ferromagnetic shape memory alloys (FSMA) are a new class of potential multifunctional materials with advancement over the conventional heat-driven shape memory alloys due to their exceptional properties. FSMAs can be controlled by magnetic field have attracted considerable attention as a type of magnetic actuator materials. Among the Heusler alloys that exhibit magnetic shape memory effect, the most extensively studied are those of the Ni-Mn-Ga system. However, to overcome some of the problems related to practical application, such as the high cost of gallium and the low martensitic transformation temperature that they usually present, the search for Ga-free alloys has been …
Assurance Of Quality Improvement For Tool Steel By Cryo-Processing, Ajit Behera
Assurance Of Quality Improvement For Tool Steel By Cryo-Processing, Ajit Behera
Ajit Behera
Cryo-processing, a supplementary process to conventional heat treatment, involves freezing of materials at cryogenic temperatures to enhance the mechanical and physical properties of materials. This paper deals with improvement of properties of the tool steel by cryogenic treatment and its greater life span in an industrial application. After the Second World War cryogenic technology were abandoned until the seventies when aerospace industry took up this technology again and the treatment started to be developed as a new industrial process. Today cryogenic treatment would be regarded as one of the most important processes in the field of industries, and it is …
Utilization And Investigation Of Polymer In Drug Industry, Ajit Behera
Utilization And Investigation Of Polymer In Drug Industry, Ajit Behera
Ajit Behera
This paper provides investigation about the links between Polymers and Drug, which can provide information for drug enforcement authorities. Oral route of drug administration is oldest and safest mode of drug administration which does not possess the sterility problem with minimal risk of damage at the site of administration. Close cooperation between laboratory and law enforcement personnel is essential to maximize the operational value of drug characterization studies. For stable & satisfactory extend release profile of drug from fabricated polymeric matrix preparation in the form of tablets were identified with different proportion. Chemical links between Drug (Trimetazidine.HCl) and Polymer (Metalose) …
Property Optimization Of Ferromagnetic Shape Memory Alloys With Respect To Cost, Ajit Behera
Property Optimization Of Ferromagnetic Shape Memory Alloys With Respect To Cost, Ajit Behera
Ajit Behera
Ferromagnetic shape memory alloys (FSMAs) are the interesting materials exhibiting shape memory effect and magnetism simultaneously. They show magnetic field-induced strains at room temperature greater than any magnetostrictive, piezoelectric or electrostrictive material, and faster frequency response than temperature driven shape memory alloys. Among various FSMA materials, Ni-Mn-X (X =Ga, In, Sn, Sb) have gained considerable interest due to their multifunctional properties such as shape memory effect, magnetocaloric effect, magnetoresistance, etc., associated with first order martensite to austenite structural transition. FSMA spread its application in broad area from aerospace industry to medical application, but not vividly use; because of its high …
New Solution For Property Improvement Of Automobile Parts, Ajit Behera
New Solution For Property Improvement Of Automobile Parts, Ajit Behera
Ajit Behera
Now a day materials have been a key to increase the performance of automotive parts, which point out to develop a new materials having better property. Main objective is to achieve increase in quantity and quality of automotive parts produced and for an optimum performance along their life cycle. Cast iron has remained a competitive material due to its low production cost. In fact, among the cast iron group one of alternative lightweight alloys is compacted graphite iron (CGI). Nowadays it is accepted that, CGI can effectively reduce the total weight of an automobile by virtue of its high strength- …
Plasma Surface Engineering: Plasma Spray Coatings, Ajit Behera
Plasma Surface Engineering: Plasma Spray Coatings, Ajit Behera
Ajit Behera
No abstract provided.
Non-Conventional Machining, Ajit Behera
Flow Characteristics Of Blast Furnace Slag, Ajit Behera
Flow Characteristics Of Blast Furnace Slag, Ajit Behera
Ajit Behera
No abstract provided.
Flow Characteristics Of Blast Furnace Slag: Practical Aspects Of Synthetic Slag, Ajit Behera
Flow Characteristics Of Blast Furnace Slag: Practical Aspects Of Synthetic Slag, Ajit Behera
Ajit Behera
No abstract provided.
Plasma Spray Of Fly-Ash+Quartz+Illmenite: Spraying On Metal Substrates, Ajit Behera
Plasma Spray Of Fly-Ash+Quartz+Illmenite: Spraying On Metal Substrates, Ajit Behera
Ajit Behera
No abstract provided.
Optimization Of The Acoustic Performance Of Polyimide Foams, Olivier Doutres, Noureddine Atalla, Rebecca Wulliman, Shari Ferguson, Steve Bailey
Optimization Of The Acoustic Performance Of Polyimide Foams, Olivier Doutres, Noureddine Atalla, Rebecca Wulliman, Shari Ferguson, Steve Bailey
Olivier Doutres Ph.D.
Due to their low weight, high fire resistance and good mechanical strength, SOLIMIDE® Polyimide foams are good candidates for sound packages in aerospace sound transmission applications. However, their high resistance to airflow limits the sound absorption efficiency inside a double wall structure and thus the sound transmission loss of the structure. The paper discusses two concepts to improve the transmission efficiency of such materials for double wall applications: (i) improving its sound absorption behavior by removing mechanically or chemically the cell membranes and thus decreasing both the flow resistance and tortuosity, (ii) coupling the Polyimide foams to screens (porous or …
A Practical Impedance Tube Method To Estimate The Normal Incidence Sound Transmission Loss Of Double Wall Structure, Olivier Doutres, Noureddine Atalla
A Practical Impedance Tube Method To Estimate The Normal Incidence Sound Transmission Loss Of Double Wall Structure, Olivier Doutres, Noureddine Atalla
Olivier Doutres Ph.D.
The objective of this paper is to propose a practical impedance tube method to optimize the sound transmission loss of double wall structure by concentrating on the sound package placed inside the structure. In a previous work, the authors derived an expression that breaks down the transmission loss of a double wall structure containing a sound absorbing blanket separated from the panels by air layers in terms of three main contributions; (i) sound transmission loss of the panels, (ii) sound transmission loss of the blanket and (iii) sound absorption due to multiple reflections inside the cavity. The sound transmission loss …
Transferts De Chaleur Dans Un Réacteur Thermochimique Solaire Muni D’Un Récepteur Volumique Poreux, Hernando Romero Paredes Rubio
Transferts De Chaleur Dans Un Réacteur Thermochimique Solaire Muni D’Un Récepteur Volumique Poreux, Hernando Romero Paredes Rubio
Hernando Romero Paredes Rubio
Un réacteur thermochimique solaire de 1 kW muni d’une structure céramique poreuse en céramique est modélisé pour simuler les transferts thermiques a l’intérieur du récepteur volumétrique. Le modèle développé a été utilisé pour prévoir le comportement thermique du réacteur en fonction des différentes conditions opératoires qui concernent le débit de gaz inerte, le flux solaire incident, la porosité, la longueur du récepteur, et la prise en compte de réactions chimiques. Les résultats montrent que la température maximale est de 1850K pour une concentration solaire de 1000 soleils. La température diminue de manière significative lorsque le débit de gaz augmente. Un …
Cryogenic Technique For Processing Steel Treatment, Ajit Behera
Cryogenic Technique For Processing Steel Treatment, Ajit Behera
Ajit Behera
Cryogenics or deep freezing have been around for quite some time. There is documented research from as far back as the 1930’s where German companies used it on components of jumbo aircraft engines. Cryogenic processing had its US origins in the 1940s. Cold treatments or sub zero treatments are done to make sure there is no retained austenite during quenching. Cryogenics is a relatively new process and to eliminate retained austenite, the temperature has to be lowered, but one that using correct procedures can bring substantial economic benefits. In cryogenic treatment the material is to be deep freeze temperatures of …