Processing Techniques and Tribological Behavior of Composite Materials

2010 ◽  
Vol 1 (2) ◽  
pp. 123-128
Author(s):  
Mohammad A. Chowdhury ◽  
Dewan M. Nuruzzaman ◽  
Mohammad L. Rahaman

2018 ◽  
Vol 33 (8) ◽  
pp. 1145-1171 ◽  
Author(s):  
Guravtar Singh Mann ◽  
Lakhwinder Pal Singh ◽  
Pramod Kumar ◽  
Sunpreet Singh

Biocomposites are considered as the next-generation materials as these can be made using natural/green ingredients to offer sustainability, eco-efficiency, and green chemistry. Nowadays, biocomposites are being utilized by numerous sectors, which include automobile, biomedical, energy, toys, sports, and so on. In this review article, an effort has been made to provide a comprehensive assessment of the available green composites and their commonly used processing technologies for the sake of materials’ capabilities to meet up with demands of the present and forthcoming future. Various types of natural fibers have been investigated with polymer matrixes for the production of composite materials that are at par with the synthetic fiber composite. This review article also highlights the requirements of the green composites in various applications with a view point of variability of fibers available and their processing techniques. This review is specially done to strengthen the knowledge bank of the young researchers working in this field.


2008 ◽  
Vol 395 ◽  
pp. 69-88 ◽  
Author(s):  
Lingappa Rangaraj ◽  
Canchi Divakar ◽  
Vikram Jayaram

Transition metal borides, carbides and nitrides are candidates for very high temperature applications. A review of various processing techniques to fabricate dense monolithic and composite materials is presented. In particular, we focus on reactive hot pressing (RHP) which allows synthesis and densification to be achieved simultaneously. We report the RHP of composites in the Ti-B-N, Zr-B-C and Zr-B-Si-C systems using the reactions of Ti/BN, Zr/B4C (Si, SiC particulate) powder mixtures at moderate pressures and temperatures. Substantial reductions in processing temperature may be realized from those in excess of 1800°C down to as low as 1200°C by exploiting a combination of transient liquid phases, plasticity in a non-stoichiometric ZrC and enhanced transport in a sub-micron microstructure.


1993 ◽  
Vol 322 ◽  
Author(s):  
Joseph D. Rigney ◽  
Preet M. Singh ◽  
John J. Lewandowski

AbstractA variety of materials have been toughened by incorporating ductile phases. Brittle silicide intermetallics such as Nb5Si3 composited with niobium particles incorporated during in situ processing techniques have realized significant improvements in toughness and stable crack extension. In the present work, toughness tests conducted on Nb5Si3/Nb materials monitored in a scanning electron microscope were instrumental in viewing the role of the deforming niobium particles on the process of toughening. In particular, the behavior of the ductile phase was monitored and related to the toughness values obtained. In an attempt to vary the behavior of the ductile phase, the composite materials were exposed to a variety of gaseous environments and subsequently tested in air. The resulting toughness, resistance-curve behavior, and in situ test results highlight the importance of the behavior of the ductile phase on subsequent properties.


2008 ◽  
Vol 144 ◽  
pp. 33-38 ◽  
Author(s):  
Joanna Mystkowska ◽  
Jan Ryszard Dąbrowski

The aim of this study was to determine the influence of powder fillers on the tribological properties of composite materials used for dental fillings. The investigated composites contain a fluoridated filler (based on Ba-Sr-Al-P-Na-silicate glass fillers) as a fluoride source as well as different powder fillers (friction modifiers) e.g. silicon nitride (Si3N4), boron nitride (BN), polyethylene (PE), polytetrafluoroethylene (PTFE). Composite disks were photo-cured and tested for wear against harder stainless-steel counterface. Wear tests were carried out by means of special tribotester in the presence of phosphate buffer as a lubricant. Influence of the load and filler contents on the friction coefficients and wear were estimated. The interaction between the filler particles and organic matrix and its influence on the tribological behavior of prepared specimens were observed. Organic powder fillers (PE, PTFE) reduced the friction coefficient and the wear of tested composite materials for dental fillings. Inorganic friction modifiers (Si3N4, BN) did not exhibit this effect.


Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3706
Author(s):  
A. Chuang ◽  
J. Erlebacher

The physical architecture of materials plays an integral role in determining material properties and functionality. While many processing techniques now exist for fabricating parts of any shape or size, a couple of techniques have emerged as facile and effective methods for creating unique structures: dealloying and additive manufacturing. This review discusses progress and challenges in the integration of dealloying techniques with the additive manufacturing (AM) platform to take advantage of the material processing capabilities established by each field. These methods are uniquely complementary: not only can we use AM to make nanoporous metals of complex, customized shapes—for instance, with applications in biomedical implants and microfluidics—but dealloying can occur simultaneously during AM to produce unique composite materials with nanoscale features of two interpenetrating phases. We discuss the experimental challenges of implementing these processing methods and how future efforts could be directed to address these difficulties. Our premise is that combining these synergistic techniques offers both new avenues for creating 3D functional materials and new functional materials that cannot be synthesized any other way. Dealloying and AM will continue to grow both independently and together as the materials community realizes the potential of this compelling combination.


Author(s):  
Abhijeet S Suryawanshi ◽  
Niranjana Behera

This study investigates the effect of smokeless tobacco on the tribological properties of two commercially used dental composite materials: Tetric N-Ceram and Z350 Dentin shade. It is to evaluate the effect of smokeless tobacco on the wear properties of two dental composite materials after some stipulated period. The wear test was conducted on pin-on-disk tribometer in the presence of artificial saliva under different loading conditions of 10, 15 and 20 N. The pins of the dental composite material were immersed in tobacco solution. The tribological behavior was studied after 2 days, 3.5 days, 6 days, 15 days and 1 month which represented the real conditions for the contact of 1 week, 2 weeks, 1 month, 2 months and 5 months, respectively, between the dental material and the tobacco solution. Under different loading conditions, Z350 Dentin material exhibited much less wear than the Tetric N-Ceram material in the presence of synthetic saliva for the specimen with or without tobacco immersion. The microstructure of the pin surface was inspected using scanning electron microscopy.


1990 ◽  
Vol 194 ◽  
Author(s):  
N. S. Stoloff ◽  
D. E. Alman

AbstractAlthough intermetallics based upon aluminum or silicon tend to have a very attractive combination of low density and excellent oxidation resistance, they suffer from lack of adequate creep strength and, in most cases, from inadequate ductility and toughness. It has been recognized for several years that an approach which could simultaneously solve both problems, without degrading other properties, is to utilize the intermetallics as matrices for composite materials. The consequence has been an explosion of interest in two-phase intermetallicbased alloys, as is manifested in the current symposium.


Author(s):  
Grant Roth ◽  
George Flowers ◽  
Robert Dean

The field of composite materials is a rapidly developing and expanding area, with new innovations and discoveries occurring almost daily, producing new available materials, processing techniques, fabrication methods, and applications. This article reviews recent innovations and developments in this field with a specific focus on syntactic and metal foams. Recent work is identified and placed in context with regard to other work in the area. A summary discussion of the implications of this work and potential applications is also provided.


2020 ◽  
Vol 16 ◽  
Author(s):  
Mazhar Ul-Islam ◽  
Sumaiya Yasir ◽  
Laiqahmed Mombasawala ◽  
Sehrish Manan ◽  
Muhammad Wajid Ullah

Abstract:: Nanomaterials such as nanoparticles, nanorods, nanofibers, and nanocomposites have received immense consideration and are widely used for different applications in various fields. The exploration of new synthesis routes, simple processing techniques, and specialized applications are growing to different fields and bringing extra interest to stakeholders. Bacterial cellulose (BC), a biopolymer produced by microbial and cell-free systems, is receiving growing applications in various fields, including medical, energy, environment, food, textile, and optoelectronics. As pristine BC lacks antimicrobial activity, conducting and magnetic properties, and possesses limited biocompatibility and optical transparency, its composites with other materials are developed to bless it with such features as well as improve its existing properties. Herein, we have reviewed the role of BC as a matrix to impregnate conducting nanomaterials (e.g., carbon nanotubes, graphene, and metals and metal oxides) and polymers (polyaniline, polypyrrole, and poly (3,4-ethylenedioxythiophene)–poly (styrene sulfonate)) for the development of composite materials. These BC-based composite materials find applications in the development of energy storage devices, wearable electronics, biosensors, and controlled drug delivery systems. We have also highlighted the major hurdles to the industrialization of BC-based composites and provided future projections of such conducting nanomaterials.


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