Advanced Materials and Processes Research Institute
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Effects of Primary Silicon Particles on the Sliding Wear Behaviour of Aluminium-Silicon Alloys
No full text`Beneficiation of a lean grade siliceous rock phosphate ore from Hirapur, India’.
No full textFroth flotation was employed to beneficiate a lean-grade siliceous rock-phosphate ore containing fluorapatite, the phosphate-bearing mineral. The main gangue minerals were quartz, iron oxides and aluminum oxides. After the rougher stage, four cleaning stages were required to upgrade the ore. The liberation size of the phosphate mineral was below 200 mesh, The reagent scheme consisted of commercial-grade sodium silicate and sodium oleate. The effect of reagent dosages, number of cleaning stages and pulp density on the efficiences of separation were studied systematically. A flowsheet was proposed for the processing of low-grade siliceous phosphate ore containing 12.1% P2O5, 55.36% SiO2 and 15.45% CaO. The flowsheet provided a useable phosphate concentrate containing 34.18% P2O5 and 14.20% SiO2 with a P2O5 recovery of 70.4% (the weight yield was 25.0%)
Microstructure and property characterisation of a modified Zinc based alloy and comparison with bearing alloys
No full textThe microstructure and physical, mechanical, and tribological properties of a modified zinc-base alloy have been characterized. In order to assess its utility as a bearing alloy, its properties have also been compared with those of a similarly processed conventional zinc-base alloy and a leaded-tin bronze (conforming to ZA27 and SAE 660 specifications, respectively) used for bearing applications. The modified zinc-base alloy shows promise in terms of better elevated-temperature strength and wear response at higher sliding speeds relative to the conventional zinc-base alloy. Interestingly, the wear behavior (especially the seizure pressure) of the modified alloy was also comparable to that of the bronze specimens at the maximum sliding speed, and was superior at the minimum sliding speed. The modified alloy also attained lower density and better hardness. Alloy behavior has been linked to the nature and type of the alloy microconstituents
Sliding wear response of a leaded-tin bronze : The influence of the counterface material characteristics.
No full textObservations were made of the dry sliding wear behavior of a leaded-tin bronze against different counterface materials (stainless, EN8, and EN24 steels) over a range of applied pressures and speeds. The study showed that, in addition to sliding speed and pressure, the characteristics of the counterface materials greatly control the wear response of the bronze. The results were further substantiated by the characteristics of the wear surfaces, subsurface regions, and debris particles generated during the tests
Development of poly(phenylene sulphide)-tubular-®bre-reinforced polypropylene composites and their mechanical and rheological properties
No full textTensile Properties of Some Zinc-Based Alloys Comprising 27.5 Al: Effects of Alloy Composition, Microstructure and Test Conditions.
No full textThis paper deals with tensile properties of a few zinc–27.5% Al based alloys under varying material composition (wherein\ud
copper has partially been replaced through nickel:silicon:nickel plus silicon) and microstructural features. The effects of: (i) strain rate at room temperature; and (ii) test temperature at a typical strain rate on the tensile (strength and elongation) properties of\ud
the alloys have also been studied. Tensile properties improved with strain rate irrespective of the alloy composition:microstructure. On the contrary, the tensile strength deteriorated with temperature while elongation followed a reverse trend. In general, the nickel:silicon-free alloy attained highest strength and elongation under all the test conditions except at the maximum test\ud
temperature. This was followed by those of the nickel containing alloy while the presence of silicon:silicon plus nickel also deteriorated the property at lower temperatures. However, alloying with nickel:silicon:nickel plus silicon caused the strength of the alloy system to become less temperature sensitive. The study suggests that it is quite possible to develop a variety of zinc-based alloys with different combinations of mechanical properties through compositional:microstructural modifications. The (partial)\ud
replacement of copper through nickel and:or silicon imparts thermal stability to the alloy system. The behaviour of the alloys has been discussed in terms of the specific nature of their constituent phases whose contribution towards governing the overall performance of the alloys greatly depends on the test conditions. The view has also been substantiated through the features of the fractured surfaces and subsurface regions of typical samples
