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In this study polyphosphate lubricant was introduced into steel rolling process. The friction coefficient reduced from 0.463 to 0.238 by the presence of polyphosphate lubricant as compared with unlubricated condition, calculated from 2-high Hille 100 rolling mill tests. A tribofilm of ~100nm can be observed on the strip surface, greatly improving the surface finish. This tribofilm well adhered on...
The contacting surfaces of modern valve systems experience a complex contact situation with repeated micro sliding at high temperatures and pressures. The wear rate of the surfaces has to be extremely low to fulfill the high demands on engine efficiency during its entire life-time—wear will cause valve recession and thus make the combustion less efficient. In addition to this, legislation requires...
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