IR@AMPRI - Advanced Materials and Processes Research Institute (CSIR)
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Sliding Wear Behaviour of Cast Iron: Influence of MoS2 and Graphite Addition to the Oil Lubricant.
No full textMorphology, thermal, electrical and electrochemical stability of nano aluminium-oxide-filled polyvinyl alcohol composite gel electrolyte
No full textAbstract. In the present work, an attempt has been made to develop nano aluminium oxide (Al2O3)-filled polyvinyl alcohol (PVA) composite gel electrolytes. Surface morphological studies, thermal behaviour, electro- chemical stability and electrical characterization of these composite gel electrolytes have been performed. An increase in the concentration of Al2O3 in composite gel electrolytes increases the amorphous characteristics of pure PVA. Bulk conductivity of composite gel electrolytes increases by an order of magnitude on addition of a nano filler. Maximum conductivity of 5 81 × 10–2 S/cm is observed for 6 wt% Al2O3-filled polymer gel compo- site electrolytes. Temperature dependence of electrical conductivity shows a combination of Arrhenius and Vogel–Tamman–Fulcher (VTF) nature. Maximum current stability during oxidation and reduction cycle is noticed for 6 wt% Al2O3-filled PVA composite electrolyte, viz. ±1 65 V
Microstructure and Micromechanism Maps to Optimize Useful Deformation Processing Conditions in Magnesium Alloy.
No full textPilot-scale demonstration study of the impact of fly ash on soil fertility and crop yield.
No full textDevelopment of Environment Friendly Hybrid Layered Sisal–Glass–Epoxy Composites
No full textSisal paper has been introduced as a new reinforcement form in natural fibre based polymer composites.
Sisal fibre obtained from Agava sisalana was transformed to pulp with moderate beating to retain sufficient
reinforcing strength in split fibres, and then was converted to handmade paper form. The paper so obtained
was impregnated with epoxy resin, stacked one over the other and subjected to heat and pressure to make
layered composites. Chopped StrandMat (CSM) of glass fibre was introduced in the composite to make high
strength sisal–glass–epoxy composites. Sisal paper epoxy composites achieved 32.5 MPa tensile strength
at 23.7 vol% of sisal paper that was further enhanced to 71.2 MPa by adding 14 vol% of glass CSM in the
hybrid composite. The mechanical properties of hybrid layered sisal–glass–epoxy revealed that sisal paper
can replace 84.5% of glass fibre in a moderate glass reinforcing epoxy composite to obtain an equivalent
range of tensile modulu
Sliding Wear Behaviour of Zinc-Based Alloy vis-à-vis Gray Cast Iron as Influenced by Applied Load and Sliding Speed
No full textPurpose – The objectives of this paper are to assess the sliding wear response of a zinc-based alloy over a range of sliding speeds and pressures in oil-lubricated condition with respect to a cast iron, to understand the role of different microconstituents in controlling the observed wear behaviour and to examine various operating material removal mechanisms. Design/methodology/approach – Sliding wear tests have been carried out using a pin-on-disc machine in oil-lubricated condition at different speeds and pressures. The wear response has been explained in terms of specific nature of various microconstituents of the specimen materials and
substantiated through the characteristics of wear surfaces, subsurface regions and debris particles. Findings – The wear rate increased with the sliding speed while load produced a mixed influence. Further, the friction coefficient and frictional heating were influenced by the test duration, load and speed in a mixed manner. Moreover, the zinc-based alloy attained lower wear rate but higher friction
coefficient than that of the cast iron while frictional heating followed a mixed trend. Practical implications – The paper further establishes a zinc-based alloy as a potential substitute material system to a well-known cast iron in
tribological applications and enables further understanding of the wear mechanisms. Originality/value – The present paper assesses the sliding wear performance of a lighter zinc-based alloy as an effective potential substitute material system to cast iron in tribological applications. An attempt has also been made to understand the role played by different microconstituents in controlling the wear behavior and substantiate the wear response through the characteristics of wear surfaces, subsurface regions and debris
Titanium foam through powder metallurgy route using acicular urea particles as space holder.
No full textIn the present work, Ti foam has been synthesized employing powder metallurgy route. Irregular titanium powder particles were used as the matrix and acicular urea particles as the space holder. The distribution of the urea particles in the matrix of the compacted mass was observed to be fairly uniform. Pore morphology and compressive behavior of the resulting foam have been studied. The processed foam consisted of acicular porous regions of size up to 500 ;Cm. The porous regions contained a large number of micro-pores along with the occasional presence of coarse pores, the latter thought to be unhealed portions of the original acicular pores. The foam delineated a distinct plateau region with plateau stress of 275 MPa and energy absorption
capacity of 55 MJ/m3
Compressive Deformation Behaviour of Al Alloy (2014)-10wt.% SiCp Composite: Effects of Strain Rate and Temperature.
No full texthis paper deals with the compressive deformation behaviour of AA2014–10 wt.% SiCp composites synthesized by stir casting technique. The response of the composites was studied over the strain rates of 0.01–10/s and the temperature range of 200–500 ◦C. The flow stress increased with increasing strain rates while increasing temperature produced a reserve effect. The flow behaviour of the samples has been represented by Zener–Holloman parameter Z that was affected by strain rate and temperature in a manner
similar to that of the flow stress. The lowering of Z value with increasing temperature is essentially due to extensive dynamic softening. The stress exponent (n) and deformation activation energy (Q) have been evaluated by linear regression analysis. The activation energy for the hot deformation of the composite was found to be 168 kJ/mol, which is higher than bulk self diffusion of pure Al i.e., 142 kJ/mol. The higher activation energy required for the flow of composite was mainly due to the alloying elements present in the Al matrix and dispersion of SiC particles that restricted the flow of material
Determination of aliphatic amines by gas chromatography-mass spectrometry after in-syringe derivatization with pentafluorobenzoyl chloride.
No full textA simple and highly sensitive gas chromatographic method has been developed for the determination of low molecular weight short-chain aliphatic amines (SCAAs) after their simultaneous extraction and in-syringe derivatization with pentafluorobenzoyl chloride (PFBOC). Derivatization of the low molecular weight aliphatic amines in bicarbonate buffer of pH 10.5 with PFBOC was followed by immersed solvent microextraction. Derivatization conditions, including reagent concentration, reaction pH, ionic concentration of buffer, reaction time, stirring rate, reaction temperature and extraction solvent, have been investigated for method optimization. Linearity was studied within range of 0.15pgml(-1)-50ngml(-1). The correlation coefficients were between 0.9934 and 0.9999. Detection limit of derivatized amines proved to be in the range of 0.117-1.527pgml(-1), and the intraday and interday relative standard deviation (RSD) values were less than 8% with respect to peak area. The method was applied for analysis of lake, river and industrial waste water. The recoveries of extraction from lake, river and industrial waste water samples, which have been spiked with different levels of aliphatic amines, were in the range of 68-99%, 63-102% and 62-105%, respectively