5.1 The extraction of minerals from the Earth’s mantle usually requires fracturing rock with tools made from metals, but clad, overlaid, or covered in some fashion with hard materials. Drilling, crushing, and moving rock involves high-stress abrasion on the surfaces that make contact with the rock. The stresses are high enough to crush/fracture the rock. This test method simulates this condition, and it is used to screen new materials for these types of applications. It can also be used as a quality control tool for materials destined for high-stress abrasion applications: slurry pumps, comminution equipment, recycling choppers, demolition equipment, etc.

5.2 Most abrasion tests use low-stress abrasion. The abrasive stays relatively intact during testing. High-stress abrasion simulates applications where the force between an abrasive substance and a tool/component will be high enough to crush the abrasive. If this describes an application under study, then this may be an appropriate test method to use.

1.1 This test method was developed for ranking the high-stress abrasion resistance of cemented carbides, but it has been successfully used on ceramics, cermets, and metal matrix hardfacings with a hardness over 55 HRC. The feature of this test method that discriminates it from other abrasion tests is that the abrasive is forced against the test specimen with a steel wheel with sufficient force to cause fracture of the abrasive particles. Some abrasion tests use rubber wheels to force abrasive against test surfaces (Test Methods G65, G105, G75). A rubber wheel produces low-stress abrasion while a steel wheel produces high-stress abrasion.

1.2 In summary, this is a high-stress laboratory abrasion test for hard materials using a water slurry of aluminum oxide particles as the abrasive medium and a rotating steel wheel to force the abrasive across a flat test specimen in line contact with the rotating wheel immersed in the slurry.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.