Abstract
In the previous work we have already confirmed that the sintered Cu-14 wt%Al-8 wt%Ni ternary alloy composed of single γ′ martensite phase showed the highest damping capacity among these sintered ternary alloys. We are going to examine this alloy as a self-lubricating noiseless bearing in this paper.
The results obtained were as follows:
(1) It was confirmed that this sintered γ′ Ni Al-bronze had better performances as a bearing especially at higher speeds with heavier loads in the bearing performance test.
(2) Both the temperature increase (ΔT) and the friction coefficient (μ) of this alloy were lower than those of Cu-10 wt%Sn and Fe-10 wt%Cu sintered alloys having PV (load × velocity) values more than 1300 and 600 (kg/cm2·m/min) respectively.
(3) Comparing the vibration-pattern of γ′ Ni Al-bronze with those of Cu-l0 wt%Sn and Fe-10 wt%Cu sintered alloys, we can confirmed that the vibration absorption of γ′ Ni Al-bronze was better than those of the others.
(4) According to the results of internal friction measurements, the maximum damping of γ′ Ni Al-bronze is uncomparably higher than those of Cu-10 wt%Sn and Fe-10 wt%Cu alloys, and the damping capacity of the Cu-Sn alloy is a little higher than that of the Fe-Cu alloy. Since it is well known that the damping capa-city is proportional to the acoustic absorptivity, it may be considered that the noiseless pattern of γ′ Ni Al-bronze gives its good performance in acoustic behavior, judging from some similarities between the results of internal friction and vibration-patterns of the above three specimens.
