Friction properties of phthalocyanine pigments
article
The friction properties of several commercially available phthalocyanine pigments have been studied. A comparison with graphite and MoS2, made on a pin and ring machine, showed that these powders are, in general, inferior to MoS2 as lubricants, but equal and sometimes superior to graphite. Some halogenated pigments show promise in combination with aluminium friction surfaces; they have moderate e.p. properties when combined with MoS2. Cine-photographic analysis of the friction surface revealed the origin of failure. While all the pigments produce very smooth surface areas, they tend to compact rather than to smear out on heavy loading. These undesirable cohesive properties are in line with the stable three-dimensional colloidal structure, evident from the high “oil absorption” values of all the pigments. Chemical analysis of the chlorinated pigments showed that one mole of an oxycompound, presumably an alcohol, is firmly bound to each mole of the dyestuff.
TNO Identifier
283436
Source
Wear, 10, pp. 383-396.
Pages
383-396
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