Papers by Keyword: Processing Techniques

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Authors: Rameshwar Kendre
Abstract: Over the years, there is significant development in the field of composites has made it possible to have alternate material for glass fibre. Since, Glass fibre have some shortcomings such as relative high density and difficulty to machine, researchers and scientists have worked to develop a Bio-composite material which is to be formed by matrix of resin and reinforcement of Natural fibre or Bio-fibre (Material derived from plant). Advantages of using such material in automotive industry are their easy availability, cheap cost, being lightweight and durability. Apart from this, these are biodegradable and recyclable, which makes the easy for disposal as compared to other petroleum based products. Now a days, Automakers are also using Bio-composites for floor mats of car, compression moulded spare tire covers. Aim of present paper is to study the different process techniques used for processing the Bio-fibre and compare different Bio-fibre with respect to their properties.
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Authors: Marius Niculescu, Iulian Vasile Antoniac, Ana Blajan
Abstract: The paper presents the processing technology that could be used in order to obtain a new design of a stem component for a hip prosthesis type lattice beam. This new design was made based on the analysis of the currently successful stems used in clinical practice and on different biomechanical and biomaterials criteria. Metallic biomaterials used for manufacturing different components for hip prosthesis are usually austenitic stainless steel type 316L, Co-Cr alloy and titanium based alloy. In our study, considering the specific design of the stem, stainless steel type 316L with the nominal compositions (%weight): C <0.03, Cr 17, Ni 14.5, Mo 2.7, Mn <2.0, Si <1.0, P <0.025, S <0.010, Fe balance is used. Different mechanical processing techniques were used in order to obtain the experimental prototype. According to the well-known limitation of the stainless steel type 316L as biomaterial for long term implants, we propose for the new stem component to use a TiN coating obtained using magnetron sputtering technique. The cytotoxicity studies were performed using a CCl 81 (VERO) stabilized cellular line, in order to analyse the biocompatibility properties. The samples were examined for the development of the cellular culture, in order to compare the results obtained using direct contact method. From the point of view of these tests, it was not observed an essential modification of cells and the cellular morphology is not affected by the presence of the TiN coated metallic samples. In the conclusion, the new geometry proposed for a stem component of cemented hip prosthesis could be made using different mechanical processing techniques and appears to be a potential solution in order to solve the problems related to the stability of the total hip prosthesis, with improved biocompatibility properties due to the TiN coatings.
239
Authors: Shao Hai Wang
Abstract: This graphite belongs to graphite schist deposits, the main mineral component is feldspar, quartz, diopside, amphibole, followed by mica, chlorite, calcite, pyrite, etc.; The average particle size of the mineral is 0.10 mm. After experimental evidence, the direct use of graphite mine tailings, ordinary cement, foamer and other materials for prepared foam concrete, and its performance fully meet the requirements of B07 density rate in JC/T 1062-2007 standard and the middle strength for the A2.5.
1994
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