Tribometer is an instrument that measures the amount of tribological, coefficient of friction, frictional strength, volume of wear and lubrication between two contact surfaces in tribology studies. Tribotester Pin On Disc is a friction and wear test tool consisting of a pin and a disc. Pins have various shapes and sizes, generally spherical or cylindrical in shape, while discs with a certain thickness are in the form of diameter plates. Utilization of conventional lathes to be used as pin on disc tribometers requires modification and adding other components. This study uses the Library Research method to collect data. Designing a pin on disc tribometer based on a conventional lathe is done by designing a tool and then making a pin holder frame that utilizes part of a conventional lathe, namely the sled rail. This study also tested the pin material and disk material as test materials to determine the wear of the material tested using a conventional lathe-based Pin On Disc by obtaining the data results obtained from the pin on disk testing of aluminum material without lubrication. The largest wear factor value is at a distance of 1.2528 km. that is equal to 0.0127 mm3/NmKeywords: tribology, tribometer, pin on disc
To enhance the mechanical properties of cast Al–Si–Cu alloys (ADC12), 0.3% of carbon nanotubes (CNTs) was added. The cast ADC12–0.3%CNT samples were synthesised via heated mould continuous casting for the creation of fine grains, and the artificial aging process was conducted at 173°C for 13 h to obtain precipitation hardening. The reinforcement and refinement of eutectic Si and precipitates (Al2Cu and Mg2Si) were achieved by adding CNTs, which leads to a high tensile strength of about 450 MPa and a relatively high ductility of about 10%. The obtained tensile strength and 0.2% proof stress are more than twice as high as those of the conventional cast ADC12 alloy. The refinement of the microstructures could be due to the interruption of their growth caused by the CNTs.
The effects of graphite and magnesium (Mg) addition on mechanical properties and microstructure of aluminum matrix composites (AMCs) have been investigated in this work. Aluminum alloy (ADC-12) was combined with graphite and Mg produced by stir casting. The effect of addition of graphite into the matrix has been studied with variation 2, 4 and 6 wt-% for each composite. The addition of Mg as wetting agent was introduced wit 0.4, 0.6 and 0.8 wt-% to promote wettability between ADC-12 and graphite. All composites were characterized both microstructures analysis and mechanical properties include tensile strength and hardness. The higher reinforcement content, the higher porosity formed, due to the tendency of de-wetting as well as particles agglomeration. One of the main intermetallic phase present evenly in aluminum matrix is Mg2Si. The addition of magnesium in the material that will form Mg2Si primary phases which have a high hardness value of these composites.
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