889 KB30 KB200020242014Elango, GopalakrishnanPalanikumar, KayaroganamRaghunath, Busuna Kuppuswamyletnik:48številka:6str. 803-810COBISSID:1111210ISSN:1580-2949URN:URN:NBN:SI:doc-I8KARN06enInštitut za kovinske materiale in tehnologijeMateriali in tehnologijealuminijeve zlitinealuminium alloydrsenjekompozitipreiskava materialatribološke lastnostiExperimental analysis of the wear behavior of hybrid metal-matrix composites of LM25Al with equal volumes of SiC + TiO2| Analiza obrabe hibridnega kompozita s kovinsko osnovo LM25Al z enakim volumenskim deležem SiC + TiO2|In the present work tribological behavior of aluminium alloy LM25 reinforced with SiC and TiO2 fabricated with the stir-casting process is investigated. The wear resistance and frictional properties of the hybrid metal-matrix composite were studied by performing a dry-sliding-wear test using a pin-on-disc wear tester. The experiments were conducted at a constant sliding velocity of 1.04 m/s and sliding distance of 628 m with various loads of (3, 4, 5) kg and the particle volume fraction ranging from 5-15 %. The results show that the reinforcement of the metal matrix with SiC and TiO2 reduces the wear rate at room temperature. The results also indicate that the wear of the test specimens increases with the increasing load and sliding distance. The coefficient of friction decreases with the load and increasing volume content of the reinforcement. The hardness of the hybrid-composite test specimens increases with the increasing volume fraction of the particle reinforcement of SiC and TiO2. The microstructure analysis reveals that SiC and TiO2 particulates are uniformly distributed in the matrix. The wear surfaces are examined with a scanning electron microscope which indicates abrasive wear mechanism due to the hard ceramic particles on the worn surfaceV tem delu je preiskovano tribološko vedenje aluminijeve zlitine LM25, ojačane s SiC in TiO2, izdelane po postopku vmešavanja v talino. Preizkušena je bila odpornost proti obrabi in lastnosti pri trenju hibridnega kompozita s kovinsko osnovo s suhim trenjem na napravi "pin-on-disc" za preizkušanje obrabe. Preizkusi so bili izvršeni pri konstantni hitrosti drsenja 1,04 m/s in poti drsenja 628 m pri različnih obremenitvah (3, 4 in 5) kg in pri volumenskem deležu delcev od 5-15 %. Rezultati kažejo, da ojačanje kovinske osnove z delci SiC in TiO2 zmanjšuje obrabo pri sobni temperaturi. Rezultati tudi kažejo, da se obraba povečuje z večanjem obremenitve in daljšanjem poti drsenja. Koeficient trenja se zmanjšuje z obremenitvijo in z večanjem volumenskega deleža delcev za ojačanje. Trdota vzorcev hibridnega kompozita narašča z naraščanjem volumenskega deleža delcev SiC in TiO2 za ojačanje. Pregled mikrostrukture je pokazal, da so delci SiC in TiO2 enakomerno razporejeni v osnovi. Preiskava obrabljenih površin z vrstičnim elektronskim mikroskopom pokaže, da gre za mehanizem abrazijske obrabe zaradi trdih delcev, ki so na obrabljeni površiniTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije