My topic is to study the mechanical properties of Mg/Al2O3/Gr hybrid metal matrix composites by using powder metallurgy technique. I am using sintering temperature rang 400-550 oC. I am now encountering problem to form the samples which I meant that the samples disintegrate during sintering process even I tried to use PVA as a binder the same things happened. May you guide me to settle this issue.
Powder metallurgy is hardly suitable for magnesium because of its enormous affinity for oxygen. During sintering, magnesium becomes magnesium oxide and you can not prevent it. Even in the best technical vacuum, magnesium will oxidize.
Ball mill the powders for 20 to 30 minutes to ensure uniform mixing and bonding of Al2O3/Gr with Mg. Argon heat treat the milled powders at 200 C for 20 to 30 min (Maintain O2 and H2
Due to highly oxidizing property of Mg, it can not be solved completely. However, it can be minimized under controlled environment and remaining as stated by Manne.
I agree with Prof. Tanwir Sir it can be minimized under a controlled environment
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