The importance of thermal influences in the friction process of lignocellulosic granular materials

• Published in: Powder technology 2025-02, Vol.452, Article 120534
• Main Authors: Wójcik, Artur, Kopeć-Jarosz, Aneta, Gąska, Adam
• Format: Article
• Language: English
• Subjects: Friction measurement; Plant granular materials; Temperature; Wood
• ISSN: 0032-5910
• DOI: 10.1016/j.powtec.2024.120534

In this paper, shredded lignocellulosic materials, i.e. oak wood, pine wood, and Miscanthus, were subjected to study. The effect of temperature on the friction process of these materials is important for the design of many technological processes. The study of friction was performed using a specially designed research stand equipped with a linear tribometer and a heating plate with adjustable temperature. The study was conducted for five temperatures within the range of 20–220 °C and for four load values. The results obtained revealed a high sensitivity of the studied material to temperature. For oak and Miscanthus, the maximum friction coefficient was achieved at the lowest studied temperature. On the other hand, the glass transition temperature was observed at temperature values of 170 °C, while for Miscanthus this temperature was lower, and in the majority of cases the minimum friction coefficient (for Miscanthus) was achieved at a temperature of 120 °C. Additionally, as the temperature increased, the percentage difference between the static and kinetic friction forces also increased. A decrease in friction coefficient was also observed (to the temperature of 170 °C) in parallel with the increase in load. This phenomenon was clearest in the case of pine. [Display omitted] •The effect of temperature on the friction of oak, pine and Miscanthus was studied.•The character of changes in frictional force from temperature was investigated.•The change in coefficient of friction from temperature and load was investigated.