More G In this practice these conditions are standardized to develop a uniform condition of wear which has been referred to as scratching abrasion 1 and 3. The value of the practice lies in predicting the relative ranking of various materials of construction in an abrasive environment. Since the practice does not attempt to duplicate all of the process conditions abrasive size, shape, pressure, impact, or corrosive elements , it should not be used to predict the exact resistance of a given material in a specific environment. Its value lies in predicting the ranking of materials in a similar relative order of merit as would occur in an abrasive environment. Volume loss data obtained from test materials whose lives are unknown in a specific abrasive environment may, however, be compared with test data obtained from a material whose life is known in the same environment.
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Grinding with a surface grinder can be a controlled form of low stress abrasion. The low stress qualifier means that the abradant is imposed on the surface with relatively low normal forces.
The operating forces must be low enough to prevent crushing the abradant. Low stress abrasion rates are directly proportional to the sliding distance and the load on the particles or protuberances. The wear rate is significantly reduced by hard micro constituents within the surface microstructure embedded carbides for example. The ASTM G65 test simulates sliding abrasion conditions under moderate pressure, using dry sand metered between a rubber wheel and a block coupon of the material being evaluated.
The test allows comparison of wear-resistant materials by their volume loss in cubic millimeters, with materials of higher wear resistance showing lower volume loss. Test Conditions Tested for revolutions at a load of 30 lb. Low-Stress Abrasion Abrasive wear occurs when hard particles are compressed with normal pressure against the surface of a metal, causing material removal. Coating or Alloy.
Kondex Uses Standardized Wear Testing for Product Improvement and New Product Development:
More G Scope 1. It is the intent of this test method to produce data that will reproducibly rank materials in their resistance to scratching abrasion under a specified set of conditions. Materials of higher abrasion resistance will have a lower volume loss. Note In order to attain uniformity among laboratories, it is the intent of this test method to require that volume loss due to abrasion be reported only in the metric system as cubic millimetres. It is particularly useful in ranking materials of medium to extreme abrasion resistance.
Engineered Surfaces to Extend Service Life and Performance
Since Kondex produces engineered wear components for its OEM customers, it makes sense a lot of research and development work goes into improving the wear resistance of these components using improved materials and coatings. The machine itself controls most of the variables, thus repeatability and reproducibility are consistent. ASTM G65 is a standardized wear test during which an abrasive material purified silica sand is introduced between the specimen and a rotating rubber wheel in order to subject the specimen to constant wear as the abrasive is pulled between the rubber surface and the surface of the specimen. The specimen is held in contact with the rubber wheel under a constant load and the sand flows at a constant rate. The value of this test lies in its ability to rank the relative wear resistance of materials by comparing the volume lost during testing.