Pub Date : 2018-07-01DOI: 10.4018/IJSEIMS.2018070102
Anitha Santhoshi Madugula, B. Krishna, G. Swaminaidu
Red mud emerges as the major waste material during the production of alumina from bauxite and its potential as a filler material in metal matrices has not yet been reported. In view of this, an attempt is made to explore the possibility of making a class of wear resistant metal matrix hybrid composites with nano-structured red mud and micro sized fly ash particles as reinforcement. The micro-sized red mud particles have been modified to nano-structured red mud using high energy ball milling and after 30 hours of milling, the size was reduced from 100 microns to 30 nm. Composites were fabricated by stir casting and experiments were conducted under laboratory condition to assess the wear characteristics of AA2024- 15 wt% fly ash (micro-sized) and varying fractions (2 wt%, 4 wt% and 6 wt%) red mud (nano-structured) hybrid composites under different working conditions in pure sliding mode on a pin-on-disc machine. Tests were conducted with sliding speeds of 200 rpm, 400 rpm and 600 rpm at loads of 10N, 20N and 30N. The increased frictional thrust at higher load results in increased de-bonding and caused easy removal of material and hence the wear rate is increased with increase in normal load. The wear resistance of the composite is increased with increase in red mud fraction. This is due to the increase in surface energy and inter-atomic bonding with increase in nano-structured red mud fraction. The addition of redmud particles to the matrix phase causes dispersion strengthening and hence the strength as well. Wear resistance is increased with increase in redmud fraction.
{"title":"Experimental Investigations on Wear Behavior of AA20204-Flyash-Nanostructured Redmud Hybrid Composites Synthesized by Stircasting","authors":"Anitha Santhoshi Madugula, B. Krishna, G. Swaminaidu","doi":"10.4018/IJSEIMS.2018070102","DOIUrl":"https://doi.org/10.4018/IJSEIMS.2018070102","url":null,"abstract":"Red mud emerges as the major waste material during the production of alumina from bauxite and its potential as a filler material in metal matrices has not yet been reported. In view of this, an attempt is made to explore the possibility of making a class of wear resistant metal matrix hybrid composites with nano-structured red mud and micro sized fly ash particles as reinforcement. The micro-sized red mud particles have been modified to nano-structured red mud using high energy ball milling and after 30 hours of milling, the size was reduced from 100 microns to 30 nm. Composites were fabricated by stir casting and experiments were conducted under laboratory condition to assess the wear characteristics of AA2024- 15 wt% fly ash (micro-sized) and varying fractions (2 wt%, 4 wt% and 6 wt%) red mud (nano-structured) hybrid composites under different working conditions in pure sliding mode on a pin-on-disc machine. Tests were conducted with sliding speeds of 200 rpm, 400 rpm and 600 rpm at loads of 10N, 20N and 30N. The increased frictional thrust at higher load results in increased de-bonding and caused easy removal of material and hence the wear rate is increased with increase in normal load. The wear resistance of the composite is increased with increase in red mud fraction. This is due to the increase in surface energy and inter-atomic bonding with increase in nano-structured red mud fraction. The addition of redmud particles to the matrix phase causes dispersion strengthening and hence the strength as well. Wear resistance is increased with increase in redmud fraction.","PeriodicalId":37123,"journal":{"name":"International Journal of Surface Engineering and Interdisciplinary Materials Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4018/IJSEIMS.2018070102","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46307906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.4018/IJSEIMS.2018070104
Anu Gupta
Hybrid natural fiber reinforced composites with ceramic fillers has been fabricated. Two ceramic fillers (Alumina and Silicon Carbide) have been used for the synthesis of composites and the samples have been fabricated with hand layup technique. 10% and 20% weight percentage of filler materials have been used for the different sets of composite samples. Erosion wear analysis of these composite samples has been carried out at different impingement angles (30,45,60,75, and 90) with varying impact velocities (48 m/s, 70 m/s, 82 m/s, and 109 m/s) and with varying erodent size (108, 125,150, 180µm). Results for the composites with and without filler have been compared. It has been observed that composites filled with particulate filler shows improvement in wear resistance properties as compared to composites without filler. Among the two fillers, Al2O3 has shown better resistance as compared to silicon carbide. A scanning electron microscope has been used to study the morphology of eroded surfaces and the mode of material removal.
{"title":"Synthesis and Erosion Wear Analysis of Short Bamboo Fiber Reinforced Epoxy Composites Filled with Ceramic Fillers","authors":"Anu Gupta","doi":"10.4018/IJSEIMS.2018070104","DOIUrl":"https://doi.org/10.4018/IJSEIMS.2018070104","url":null,"abstract":"Hybrid natural fiber reinforced composites with ceramic fillers has been fabricated. Two ceramic fillers (Alumina and Silicon Carbide) have been used for the synthesis of composites and the samples have been fabricated with hand layup technique. 10% and 20% weight percentage of filler materials have been used for the different sets of composite samples. Erosion wear analysis of these composite samples has been carried out at different impingement angles (30,45,60,75, and 90) with varying impact velocities (48 m/s, 70 m/s, 82 m/s, and 109 m/s) and with varying erodent size (108, 125,150, 180µm). Results for the composites with and without filler have been compared. It has been observed that composites filled with particulate filler shows improvement in wear resistance properties as compared to composites without filler. Among the two fillers, Al2O3 has shown better resistance as compared to silicon carbide. A scanning electron microscope has been used to study the morphology of eroded surfaces and the mode of material removal.","PeriodicalId":37123,"journal":{"name":"International Journal of Surface Engineering and Interdisciplinary Materials Science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4018/IJSEIMS.2018070104","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41388409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-01DOI: 10.4018/IJSEIMS.2018070101
G. Molina, Fnu Aktaruzzaman, V. Soloiu, Mosfequr Rahman
Nanofluids are suspensions of nanoparticles in ordinary coolants, but their tribological effects on heat-exchanger materials are unknown. Previous research has explored wear from distilled-water-base nanofluids only, while most engine-coolants are alcohol solutions in water. This article presents testing of aluminum and copper by jet impingement of 50%-ethylene-glycol in water solution and of its 2%-alumina nanofluid. The effects are investigated of nanoparticle addition on the anticorrosion protection provided by ethylene glycol. The observed modifications showed that ethylene-glycol in water nanofluid led to wear patterns that were different than those obtained with the base-fluid; nanoalumina addition enhanced erosion and corrosion on aluminum and copper. Comparing the effects of ethylene glycol and its nanofluid solutions to those from same tests performed with distilled-water and its nanofluid suggests that nanopowders can substantially enhance wear by decreasing the anticorrosion action of ethylene glycol by a synergetic mechanism of erosion-corrosion
{"title":"Erosion-Corrosion Wear of Heat-Exchanger Materials by Water/Ethylene-Glycol/Alumina Nanofluids","authors":"G. Molina, Fnu Aktaruzzaman, V. Soloiu, Mosfequr Rahman","doi":"10.4018/IJSEIMS.2018070101","DOIUrl":"https://doi.org/10.4018/IJSEIMS.2018070101","url":null,"abstract":"Nanofluids are suspensions of nanoparticles in ordinary coolants, but their tribological effects on heat-exchanger materials are unknown. Previous research has explored wear from distilled-water-base nanofluids only, while most engine-coolants are alcohol solutions in water. This article presents testing of aluminum and copper by jet impingement of 50%-ethylene-glycol in water solution and of its 2%-alumina nanofluid. The effects are investigated of nanoparticle addition on the anticorrosion protection provided by ethylene glycol. The observed modifications showed that ethylene-glycol in water nanofluid led to wear patterns that were different than those obtained with the base-fluid; nanoalumina addition enhanced erosion and corrosion on aluminum and copper. Comparing the effects of ethylene glycol and its nanofluid solutions to those from same tests performed with distilled-water and its nanofluid suggests that nanopowders can substantially enhance wear by decreasing the anticorrosion action of ethylene glycol by a synergetic mechanism of erosion-corrosion","PeriodicalId":37123,"journal":{"name":"International Journal of Surface Engineering and Interdisciplinary Materials Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4018/IJSEIMS.2018070101","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48422600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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