Tuvshin Dugarjav/Takeshi Yamaguchi/Kei Shibata/Kazuo Hokkirigawa
The Journal of Mechanical Science and Technology, vol. 24, no. 1, pp.85-88, 2010

Abstract : The friction and wear behaviors of rice husk (RH) ceramics, prepared by carbonizing the mixture of rice husk and phenol resin at 900 °C in N2 gas environment, sliding against high carbon chromium steel (JIS SUJ2), austenitic stainless steel (JIS SUS304), and Al2O3 under dry condition were investigated using a ball-on-disk tribometer. The test results show that the friction coefficient of RH ceramics takes very low values 0.05-0.08 and 0.06-0.11 sliding against SUJ2 and SUS304, respectively, and much higher values around 0.14-0.23 against Al2O3. It was also shown that SUJ2 provides the lowest specific wear rate values below 10-9 mm2/N, while, those of SUS304 and Al2O3 mostly stayed between 10-9 to 10-8 mm2/N range. The worn surfaces of counterparts were observed with optical microscopy and analyzed using cross-sectional transmission electron microscopy with energy dispersive X-ray spectroscopy and electron diffraction. It was suggested that the tribological behaviors of RH ceramics are closely related with the formation of a transferred film, consisted of amorphous silica and carbon particles, on a counterpart surface. The transferred film was formed readily on SUJ2 balls, whereas for SUS304 the presence of the film was subject of the sliding conditions. Moreover, formation of the transferred film could not be detected on Al2O3 counterparts.

Keyword : Amorphous silica; Carbon; Counterpart material; Friction; Rice husk ceramics; Transferred film; Wear