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The Taber Abraser is really a commercial wear tester made to test the abrasive wear resistance of flat specimens of a multitude of materials including coatings, paints, metals, plastics, paper, textiles, ceramic tile, and etched or printed material on glass. The wear condition could be considered low-stress, two-body abrasive wear. The model 505 Taber Abraser, located in the Rolla Research Center, can test two specimens simultaneously, a characteristic helpful for rapidly obtaining duplicate tests or comparing two materials. Taber Abraser Equipment and Specimens Wear occurs by the act of a set of abrasive wheels in touch with the specimen. The specimen is rotated at 72 rpm taber-abraser-testby a turntable, as shown in figure 2, which in turn causes the abrasive wheels to drag and rotate. The horizontal axis of every abrading wheel is displaced from your vertical axis from the test material to create the abrading motion between wheels and specimen. The abrasive action leads to an “X” wear pattern spanning a ringed part of the specimen (fig. 3). Test specimens vary from 10 cm square to 16 cm in diam, based upon the specimen holder. An opening of 6.4 or 9.5 mm is necessary in the middle of most specimens . A place of 30 cm² is subjected to abrasion. The abrading wheels utilized for an exam are selected to offer the required abrasive quality. Five kinds of standard abrading wheels as well as other special wheels can be found from your manufacturer. The wheels could have silicon carbide or alumina abrasives over a variety of particle sizes and could be bonded with either rubber or resin. Taber Abraser Procedure An exam is carried out by placing the required specimen around the turntable. The required weight load is positioned around the arms carrying the abrasive wheels. Plenty of 125, 250, 500, or one thousand g might be selected. The exam is run continuously for any prescribed quantity of revolutions from the specimen: 10, 100, one thousand, or regardless of the desired number. The count is displayed, as well as the unit will automatically stop in the prescribed count. A vacuum pickup collects abraded particles. The exam results might be evaluated by four methods, based on the manufacturer: Visual endpoint method. Certain materials would be best evaluated by observing the purpose where they undergo a marked alternation in appearance or breakdown physically. With this method, the amount of test cycles recorded around the counter is really a wear index (rate of wear) from the sample. Materials that lend themselves advisable to this process are plated, glazed, or polished surfaces; paper; textiles; and fabrics. Weight-loss method. The load- loss way of evaluation may be used when test outcomes are in comparison with the ones from similar materials with approximately the same density. In this instance, the Taber wear index is losing weight in milligrams per thousand cycles of abrasion for any test performed within a specific group of conditions. Volume-loss method. When you compare the wear loss in materials of various density, it really is usual to make use of the amount loss. The load loss is transformed into volume loss by dividing from the density from the material. Depth-of-wear method. It might be desirable after abrasion tests to look at the depth of wear. You can do this having an optical micrometer calibrated in increments of a single ten-thousandths of the inch. Due to the wide selection of materials tested, kinds of abrasive wheels, loads, and revolutions, typical results should not be reported. For any mild steel utilizing a load of one thousand g for one thousand revolutions, the load loss is all about 30 to 60 mg, based upon the kind of abrasive wheel used. Abrasion Resistance Test of Refractory Materials The Bureau’s abrasion resistance test equipment for refractory materials is situated in the Tuscaloosa Research Center. The gear and test procedure are described in ASTM designation C704-76a, entitled “Standard Way of Test for Abrasion Resistance of Refractory Materials at Room Temperature”. The technique covers the determination from the resistance of refractory brick to some sandblast stream. The exam measures the amount of material abraded from the flat surface in a right angle to some nozzle by which one thousand g of size-graded silicon carbide grain is blasted by air at 448 kPa (65 psi). The exam condition is considered low-stress, two-body abrasive wear. The problem is regarded as low-stress because silicon carbide is tougher and much more wear-resistant compared to the refractory brick normally tested. For more information about TESTEX taber abraser, simply visit our website.
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