Abstract One of the important problems in powder metallurgy is to determine the time of sintering temperature or melting of materials and the time required to perform the reaction. They depend on several factors including the amount of the pressure applied in the step of preparation of raw compressed sample. So, in this study, the effect of the press pressure on the melting point of the compacted samples prepared from aluminum powder was studied. The used sample in the form of cylinders with a diameter of 20 mm and a height of 10 mm, were built by pressing at pressure of 100, 200, 225, 250, and 275 MPa. For making each sample 9 grams of pure aluminum powder was used. The samples were separately placed in a furnace and heated by heating rate of 10°C/s. Temperature-time diagrams were obtained with using a thermocouple installed in the samples and with the help of Data acquisition system. In the next series of experiments 5 samples with the same conditions as the previous test samples were built and separately placed in a furnace under Argon gas at 700°C. Time to melting temperature was measured by a chronometer. The samples were examined with light and electron microscopy to determine their melting and sintering behavior. The results of the first series of experiments showed that with increasing pressing pressure, melting duration was reduced. Examination of the temperature-time diagram showed reducing of melting point with increasing press pressure.

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