OBRABOTKAMETALLOV Vol. 28 No. 3 2026 26 TECHNOLOGY References 1. Deshwal D., Belgamwar S.U., Bekinal S.I., Doddamani M. Role of reinforcement on the tribological properties of polytetrafl uoroethylene composites: A comprehensive review. Polymer Composites, 2024, vol. 45, pp. 14475– 14497. 2. Puts G.J., Crouse P., Ameduri B.M. Polytetrafl uoroethylene: Synthesis and characterization of the original extreme polymer. Chemical Reviews, 2019, vol. 119, pp. 1763–1805. 3. Dhanumalayan E., Joshi G.M. Performance properties and applications of polytetrafl uoroethylene (PTFE) – A review. Advanced Composites and Hybrid Materials, 2018, vol. 1, pp. 247–268. 4. Zhao G., Zhu S. Al₂O₃/PTFE composites for marine self-lubricating bearings: Modulation mechanism of alumina particle size on material mechanical properties and tribological behaviour. Lubricants, 2025, vol. 13 (9). DOI: 10.3390/lubricants13090377. Eff ect of fi ller morphology on cryogenic treatment sintered PTFE nanocomposites Vinod Damdhar 1, 2, a, *, Kavita Pande 3, b, Arun Autee 1, c 1 Mechanical Engineering Department, Maharashtra Institute of Technology, Chhatrapati Sambhajinagar (Aurangabad), M.S., 431010, India 2 Center for Engineering Exploration, C.S.M.S.S. Chh. Shahu College of Engineering, Chhatrapati Sambhajinagar (Aurangabad), M.S., 431010, India 3 Matverse Vision Pvt Ltd, Nagpur, M.S., 440001, India a https://orcid.org/0000-0002-3719-0157, vinod.damdhar@gmail.com; b https://orcid.org/0000-0003-3201-4418, kavita19pande@gmail.com; c https://orcid.org/0000-0003-2132-0532, arun.autee@mit.asia Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2026 vol. 28 no. 3 pp. 6–28 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2026-28.3-6-28 ART I CLE I NFO Article history: Received: 02 May 2026 Revised: 25 May 2026 Accepted: 05 June 2026 Available online: 15 September 2026 Keywords: Sintered PTFE composites Nano-alumina Nano-mica Cryogenic treatment Filler geometry ABSTRACT Introduction. Polytetrafl uoroethylene (PTFE) has outstanding chemical resistance and a low friction coeffi cient but weak mechanical properties and wear resistance, which restrict its wider use in tribological applications. Thus, the present study aims to investigate the coupled infl uence of nano-fi ller geometry and cryogenic treatment on the structure–property evolution of PTFE nanocomposites. Materials and methods. The optimized nanocomposite systems (1.0 wt.% nano-mica and 1.5 wt.% nano-alumina), along with neat PTFE, were produced by cold compression moulding and sintering. The specimens were soaked for 8, 12, and 16 h in liquid nitrogen at −185 °C and then evaluated for mechanical, tribological, and structural properties using XRD, FTIR, and SEM. Results and discussion. Compared to untreated PTFE (~27.6 MPa tensile strength), both nano-fi llers enhanced the strength and wear resistance. The composites exhibited a strong geometry-dependent response to cryogenic treatment. The tensile strength of mica-fi lled PTFE was at a maximum at 8 h (~37.9 MPa), while alumina-fi lled PTFE reached its peak at 16 h (~36.5 MPa). The same trend was observed for hardness and wear resistance. XRD revealed reordering of crystallinity and improved fi ller–matrix interaction, while SEM showed more stable interfaces in the alumina composites. Extended treatment caused interfacial heterogeneity and defects in mica-fi lled PTFE, attributed to its fl aky morphology. Conclusion. Filler geometry is a major determinant of the eff ectiveness of cryogenic treatment in PTFE nanocomposites. Globular nano-alumina exhibited superior tensile strength, hardness, and wear resistance compared to fl aky nano-mica after long-term cryogenic treatment. This study presents important structure–property relationships for the development of PTFE-based nanocomposites for advanced tribological applications. For citation: Damdhar V., Pande K., Autee A. Eff ect of fi ller morphology on cryogenic treatment sintered PTFE nanocomposites. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2026, vol. 28, no. 3, pp. 6–28. DOI: 10.17212/1994-6309-2026-28.3-6-28. (In Russian). ______ * Corresponding author Damdhar Vinod, ME. (Manufacturing Engineering), Assistant Professor C.S.M.S.S. Chh. Shahu College of Engineering, Chhatrapati Sambhajinagar (Aurangabad), 431010, M.S., India Tel.: 91 9607200527, e-mail: vinod.damdhar@gmail.com
RkJQdWJsaXNoZXIy MTk0ODM1