The wear behaviour of different metallic bond alloys tested in a modified B611-13 test in an acidic, neutral and alkaline media

The abrasive and adhesive wear behaviour of metallic bonds can be significantly affected by varying pH values of the attacking medium. However, the knowledge about the pH value influence on diamond impregnated bits used in core drilling industry is still limited. One recent publication shows the advantage of modifying a standard ASTM B611-13 test to investigate the abrasive and adhesive wear behaviour of a diamond segment bond material in a neutral regime (pH7). This study mainly focuses on the effects of a varying surrounding media on the tribological behaviour using an acidic, neutral and alkaline slurry. This emulates more aggressive conditions for the diamond segments used in mining as well as construction industry. The pH value at which such diamond segments operate can differ from pH2 up to a value of pH13. The present work studies the wear behaviour of two metallic bonds in a modified B611-13 arrangement at 4 m/s sliding speed and different pH values. The tested specimens are investigated with regard to their change in mass and microstructure at the sliding interface zone. The results reveal a significant influence of the pH value on the wear behaviour of the bond system.ISSN:0043-1648ISSN:1873-257

Abrasive and adhesive wear behaviour of metallic bonds in a synthetic slurry test for wear prediction in reinforced concrete

The understanding of the tribological system and the corresponding wear behaviour of metallic materials is, especially in wet condition and in presence of abrasive particles, of high importance. This particularly applies for construction applications, like core drilling and sawing in reinforced concrete, where the knowledge about adhesive wear but also abrasive micro- and macro-mechanisms is limited. If it comes to material removal in reinforced concrete, adhesive wear between the metal matrix and the reinforcement steel is observed, besides abrasive wear as a result of the metal matrix–concrete interaction. To differentiate adhesive and abrasive wear, a new approach for testing metal materials with varying counter parts and different sliding speeds in a wet-slurry test is presented. A for this work modified B611 - 13 test is used to test two different metal compositions to investigate their change in mass, micro-hardness and the microstructure at the sliding interface zone. Additionally, the wear pattern is identified by optical microscope and under the scanning electron microscope. To differentiate the main wear mechanisms, a S355 steel and a silicon carbide ceramic are used as a counterbody. The results show that it is possible to separate the wear behaviour while testing in different conditions