By MJ Neale and M Gee (Auth.)
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Extra resources for A Guide to Wear Problems and Testing for Industry
The overall effect of this will be to give a reduced wear rate on the specimen compared with that which would have occurred if new, sharp, abrasive material had been continuously fed to the specimen. This is a problem with the use of wear tests such as that shown in Fig. 2(c). An alternative simple test is to use the abrasive bonded to a backing material, similar to abrasive papers, but the problem then is that the abrasive becomes blocked with wear debris as well as the previously described risk of blunting.
The ball hardness will therefore be at least 60 Rockwell C or 750 Vickers and since, for simulation, this abrasive-carrying surface needs to be the softer of the two, the results from this test are only likely to be relevant directly to practical conditions, in which one component is very hard, such as a ceramic coating. Alternatively, softer metal balls can be used, but their accurate manufacture requires special skills. However, the real merit of this particular test is that it provides a wearing 'indentor' of constant geometry.
The test shown in Fig. 3(b), with its continuous rotation, is more appropriate for the simulation of higher speed, continuously moving contacts such as the scraper blades of mixers. In such applications, the deflection of the blade under the influence of friction will be an important practical feature in its operation- this can be simulated in the test, by the use of pins of an appropriate lateral stiffness. 48 Wear Problems and Testing for Industry It is also possible to use tests such as ASTM G65, as discussed in the previous section, to simulate this type of wear using metal wheels and tests blocks of different hardness.