By MJ Neale and M Gee (Auth.)
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Extra resources for A Guide to Wear Problems and Testing for Industry
The selection of materials to resist particle erosion is critically dependent on the angle of impact of the particles. If the flow is at a Industrial Wear Problems 29 10 2 "r-" II (1) N t~-O ] 0~ Stellites -- E (-.. -. m ~ Titanium alloys ] 0 0 -- (-.. O Cast bronzes O r O Nickel alloys o > 0-1 Wrought bronzes Aluminium alloys rr 10-2 10-2 I I I0 -I 10 0 Ultimate resilience characteristic in MN/m 2 Fig. 10 The resistance of materials to cavitation erosion (to see this figure in co/our, please refer to colour plate section) 101 30 Wear Problems and Testing for Industry shallow angle along the surface, the process is related to abrasive wear and harder surfaces give improved wear resistance.
The reciprocating velocities will be lower than the rubbing speeds used in the arrangement of Fig. 4(a) and the temperature can be externally controlled. The arrangement shown in Fig. 4(b) provides a simplified configuration of the arrangement represented by Fig. 4(e), in that a test material only needs to be available in the form of a block and not a complete beating bush. The block can also be pre-shaped to give a consistent bedding area through the test. However, in practice, there are invariably problems with misalignment and the block mounting needs to have some provision for lateral self-alignment.
The test is run for a set number of wheel revolutions, typically in the range 1000-6000, with a test load of between 45 and 130 N. Since the wear zone is of a variable profile, the amount of wear is measured by weight loss or volume. A critical feature of this test machine is the design of the sand feed nozzle because the feed must be uniform across the wheel width and at a steady rate. The contact load also needs to be carefully controlled. Another problem is that the abrasive particles can slide across the test surface with a cutting action, or can roll across resulting in material displacement, rather than cutting.
A Guide to Wear Problems and Testing for Industry by MJ Neale and M Gee (Auth.)