Prakt. Met. Sonderband 30 (1999) 451 
1 5). The average friction coefficients of investigated samples as detected in FAST are given in Fig. 2. As apparent 
te a alt from Fig. 2, the friction coefficient varied between two extreme values of p=0.31 to n=0.73, however, it is 
The ng | apparent that the coefficient of friction of most studied materials is very similar ranging between p=0.4 to 0.45. 
celle fhe At given testing conditions, the varying content of cellulose, glassy fiber and Kevlar significantly influences p 
only in several cases. 
250 
: ™ 00 5 
i 40 1 
; | 
=" | 100 5 
. E 
r 5 La R 
S 00, 
. 0 1000 2000 3000 4000 Coa 
ong time [s] 
Fig. 1; The coefficient of friction, wear and temperature dependencies detected in FAST of sample#151. (Gpom is 
applied normal pressure [MPa], p is the coefficient of friction, dt is thickness variation [mm], and T is 
[5 minutes. The temperature [°C]). 
tg was done. The 
3 temperature of The highest coefficient of friction was exhibited by specimens containing 10 vol. % of glassy phase and the 
im the porosity of highest value of n=0.73 was detected for the material, containing 40% of cellulose. Materials with 10 vol. % of 
ost cured (cross- glassy phase and 10 to 30 vol. % of Kevlar possess a coefficient of friction close to 0.5. The lowest values of the 
nm x Smm) were friction coefficient were detected in specimens without a glassy phase in their structure. It was impossible to find 
2 was driven wih any statistical relation between the composition and detected values of the coefficient of friction. However, there 
is measured every exists a statistical dependence of wear values on the composition of individual specimens. The calculated 
test, Wear was “equiwear” curves are shown in Fig. 3. The most intensive wear was observed for specimens containing the 
largest amount of glassy phase. Increasing content of Kevlar and also cellulose modifies this tendency. Kevlar 
prevents intensive wearing of samples better than cellulose in specimens containing higher amounts of glassy 
Fansmission phase. As apparent from Fig. 3, the most appropriate content of glassy phase with respect to wear intensity is 10 
wis (EDX Noran vol.%. The lowest wear (4.8%) within the investigated group of materials containing cellulose, glassy and 
[ was based on Kevlar fibers was demonstrated by specimen #151 containing 40 vol. % of Kevlar and 10 vol. % of glassy phase. 
e inclined brake Glassy fiber 
areeps of by so) 
resulting film was 
tormvar holev sog. 9010 
30 A od 20 
nen tested using Ce 
Note that detected Sp 049 0.00.40 
down in Fig. | x ) .. | te EN 
le shown Fi / “oar 031 "ozs 5% \ 80 
cond lf Se ® * 0 40 30 20 10 0 
afore and a Cellulose fiber Aramid fiber 
Fig. 2: Composition (in vol. %) and the detected average coefficient of friction of investigated samples.