The friction performance and thermal resistance of paper-based oil immersed friction materials are influenced by the material structure formed as a result of the combination of porosity and resiliency. In this paper, the effects of porosity on the thermal durability of paper-based friction materials were studied, of which the contents are varied but the geometries are the same as used in real applications. The relationship between the degree of carbonization and the durability was discussed in several terms of mechanical property changes of the material. The friction and thermal durability tests were conducted by using an SAE No. 2 apparatus under a repeated engage-disengagement condition. To obtain the thermal durability performance the sliding surface temperature was also measured. Coefficients of friction of the low porosity material tend to decrease as the test cycle increases. And the total thickness loss of the low porosity material after durability test is bigger than that of the high porosity material. These durability performances were well correlated with the mechanical and physical property changes of the material, that is, variations of carbonization degree, permeability and hysteresis loss energy.

Issue Section:
Research Papers
Topics:
Durability, Friction materials, Porosity, Friction, Cycles, Mechanical properties, Permeability, Resilience, Temperature, Thermal resistance
1.
Anderson, A. E., 1972, “Friction and Wear of Paper Type Wet Friction Elements,” SAE Tech. Pap., 720521.
2.
Collins, R. E., 1961, Flow of Fluids through Porous Materials, Reinhold Publishing Corporation, New York, pp. 47–51.
3.
Ito
H.
,
Fujimoto
K.
,
Eguchi
M.
, and
Yamamoto
T.
,
1993
, “
Friction Characteristics of a Paper-Based Facing for a Wet Clutch under a Variety of Sliding Conditions
,”
STLE Tribology Transactions
, Vol.
36
, pp.
134
–
138
.
4.
Kambara, S., and Fujiwara, S., 1967, High Polymer Analysis Handbook, Asakura Publishing Co., Ltd., Tokyo, pp. 183–189.
5.
Kanzawa, A., and Hasetani, M., 1988, Porous Material Handbook, IPC Inc., Tokyo, pp. 28–31.
6.
Matsumoto, T., 1993, “A Study of the Influence of Porosity and Resiliency of a Paper-Based Friction Material on the Friction Characteristics and Heat Resistance of the Material,” SAE Tech. Pap., 932924.
7.
Matsumoto, T., 1994, “The Influence of Paper-Based Friction Material Porosity on the Performance of a Wet Clutch,” SAE Tech. Pap. 941032.
8.
Nakagawa, T., 1978, Rheology, Iwanami Shoten Publishers, Tokyo, pp. 174–185.
9.
Ting
L. L.
,
1972
, “
A Mathematical Analog for Determination of Porous Annular Disk Squeeze Film Behavior Including the Fluid Inertia Effect
,”
ASME Journal of Basic Engineering
, Vol.
94
, pp.
417
–
421
.
10.
Ting
L. L.
,
1975
, “
Engagement Behavior of Lubricated Porous Annular Disks (Part 1, Part 2)
,”
Wear
, Vol.
34
, No.
2
, pp.
159
–
182
.
11.
Wu
H.
,
1970
, “
Squeeze-Film Behavior for Porous Annular Disks
,”
ASME JOURNAL OF LUBRICATION TECHNOLOGY
, Vol.
92
, pp.
593
–
596
.
12.
Yamamoto, T., Yamada, T., and Eguchi, M., 1994, “Permeability Measurement of a Paper-Based Friction Material for a Wet Clutch,” Proceedings of JAST Tribology Conference, May, pp. 447–450.
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