Influence of surface roughness of alumina ceramics on indentation size

Majić Renjo, Marijana and Ćurković, Lidija and Ćorić, Danko (2014) Influence of surface roughness of alumina ceramics on indentation size. = Influence of surface roughness of alumina ceramics on indentation size. Materialpruefung/Materials Testing, 56 (1). pp. 32-39. ISSN 0025-5300. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q4 (2013). Točan broj autora: 3.

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Alumina (Al2O3) is one of the most important technical ceramic materials due to its good properties and its acceptable price. For some purposes, it is important to achieve either a very smooth or a rough surface of the ceramic object. The aim of this study was to evaluate the influence of different surface finish processes on the surface roughness of alumina and, consequently, on the measured Knoop hardness. Four types of samples were prepared, each with a different surface finish - ground with different SiC abrasive papers or polished with diamond pastes with different granulation. For each sample three indentation loads were used: 0.4903 N (HK 0.05), 4.903 N (HK 0.5) and 49.03 N (HK 5). It has been noticed that all samples exhibited a decrease in hardness with the increasing applied test load, a phenomenon known as the normal indentation size effect (ISE). In order to investigate this occurrence, three mathematical models were applied, i. e., Meyer's law, the proportional specimen resistance model (PSR) and modified proportional specimen resistance model (MPSR). The results showed that the alumina surface roughness significantly affects the measured Knoop hardness. Dependence of Knoop hardness and the indentation load can be quantified by all three mathematical models. © Carl Hanser Verlag.

Item Type: Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian): Abrasive papers; Alumina ceramic; Indentation load; Indentation size; Indentation size effects; Proportional specimen resistance model; Surface finishes; Technical ceramics; Ceramic materials; Finishing; Hardness; Mathematical models; Silicon carbide; Surface roughness; Alumina
Subjects: TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 1000 Department of Materials > 1010 Chair of Materials and Tribology
Indexed in Web of Science: Yes
Indexed in Current Contents: No
Citations JCR: 0 (1.6.2015.)
Quartiles: Q4 (2013)
Citations SCOPUS: 0 (1.6.2015.)
Date Deposited: 01 Jun 2015 11:54
Last Modified: 01 Jun 2015 11:54

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