Bisht, Atul and Chockalingam, Sreekumar and Tripathi, R. K. and Dwivedi, Neeraj and Dayal, Saurabh and Kumar, Sushil and Panwar, O. S. and Chand, Jagdish and Singh, Sandeep and Kesarwani, Ajay (2013) Improved surface properties of beta-SiAlON by diamond-like carbon coatings. Diamond and Related Materials, 36. 44-50. ISSN 0925-9635

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Abstract

beta-SiAlON ceramics have potential for biomedical implants but they suffer due to moderate,hardness and high surface roughness. Attempts have been made to improve the hardness and surface properties by coating diamond-like carbon (DLC) on beta-SiAlON ceramics using radio frequency-plasma-enhanced chemical vapor deposition. By optimizing the self-bias and bonding environment, we report the deposition of very hard (43.4 GPa) and ultra smooth (surface roughness 0.47 nm) DLC coating on beta-SiAlON at a self-bias of -140 V. Compared with uncoated beta-SiAlON, DLC coated beta-SiAlON show three times increment in hardness and ten times reduction in surface roughness. When the self-bias is changed, nano-mechanical properties of such DLC coated beta-SiAlON ceramics, however, got modified, which correlated with the bias induced structural changes. When the indentation load is increased from 3 to 10 mN, hardness decreased significantly due to increase in substrate (or ceramic) effect. Owing to high hardness, high wear resistance and low surface roughness, DLC coated SiAlON structure can find wide biomedical applications such as prosthetic hip joint replacement

Item Type:	Article
Additional Information:	copyright for this article belongs to M/s Elsevier
Subjects:	Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	19 Aug 2026 10:02
Last Modified:	19 Aug 2026 10:02
URI:	https://npl.csircentral.net/id/eprint/3175

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