Page 349 - Handbook of Materials Failure Analysis

100 µm 50µm
(a) (b)

50µm 50µm
(c) (d)
FIGURE 13.52
The different color varnish particles (200 ): (a) a green varnish particle from a gas turbine oil
sample; (b) a dark-green varnish particle from a hydraulic oil sample; (c) a blue varnish
particle from a hydraulic oil sample; (d) a purple varnish particle from a gearbox oil sample.

(a) 300µm (b) 100µm

FIGURE 13.53
The beautiful colors of the film debris of the EP additives from a bearing oil sample (Mobil
Vaculine 528) under optical microscope with white reflect light: (a) 50 ; (b) 100 .

200µm 50µm
(a) (b)
FIGURE 13.54
The film debris from different oil samples: (a) the film debris from a bearing oil sample (50 );
(b) the film debris from a gearbox oil sample (100 ).