Metalurgia do pó em ligas Al-SI

Abstract

The present work has the purpose of verifying the possible microstructural differences and consequently differences of properties that an aluminum-silicon alloy metal powder can obtain when compacted in different compaction loads, in this experiment twelve test bodies were prepared in four different compaction loads ( 300,400,450 and 500 Mpa), the base material for the work was a chipshaped aluminum alloy which was passed through a ball mill for about four hours at half-hourly intervals to check whether the granulometry was already adequate was used sieves of about 100 mesh, to ensure that all specimens would have the same granulometry, then half a gram of the powdered material was placed in a 0.6 cm diameter die and with the aid of a universal compacting at different loads. After compacting the material was weighed again and with the aid of a pachymeter, then its dimensions were removed where we obtain the first difference in the test bodies. The samples that had a higher compaction load were of shorter length and, consequently, denser. Then the sintering of the test bodies was carried out in a tubular furnace with the following parameters 600C for two hours. Following the principle of Archimedes for the verification of the apparent weight and wet weight where it was verified that the samples with a lower degree of compaction behaved with a greater weight gain because in them a greater degree of porosity was obtained, the metallographic preparation.