STUDI SIFAT FISIS DAN MEKANIS KOMPOSIT ALUMINIUM / FLY ASH DENGAN VARIASI FRAKSI BERAT DAN TEMPERATUR SINTERING
ABSTARCT: Composite materials
made from aluminum powder as matrix and fly ash as reinforcement are known as
Al-MMCs. They can be produced with powder metallurgy technique. This research
is aim to study physical and mechanical properties of aluminum/fly ash
composite with various weight fractions and sintering temperatures.The aluminum
powder was obtained from Merck Germany that has irregular shape and fine
particle size. The fly ash was collected from PLTU Suralaya and it has
spherical shape with particle size of <53m. Fly
ash powder was calcined in temperature of 800oC for 3 hours to
eliminate compounds that are evaporable in sintering process. Various weight
fractions of fly ash as reinforcement are 7.5%, 5%, 2.5% and 0%. Each
composition of aluminum powder and fly ash was mixed for 5 hours, and then they
were uniaxially pre-compacted to produce greenbody of cylinder specimens and
rectangular cross-section bar specimens using a pressure of 100 MPa. The green
compacts were further compacted with cold isostatic pressing using media of
lubricating oil with a pressure of 100 MPa. Then the specimens were
pressureless sintered with various temperatures of 500oC, 525oC,
550oC, and 575oC in argon environment for 1 hour. The
sintered specimens were tested include bending strenght (MOR), Vickers hardness
(Hv), wear resistance (Wa) and density (). The
results of the research indicate that the optimum mechanical properties
are obtained in specimens containing 5% weight fly ash sintered at temperature
of 550oC. The optimum properties of bending strength, Vickers
hardness, wear resistance and density are 73.03 MPa, 40.5kg/mm2 ,
0.0021 mm3/Nm and 2.504 gram/cm3respectively.
Penulis: Zulfikar
Kode Jurnal: jptmesindd100192
