Spherical aluminum powder (SAP) 0.002 mm in diameter is treated to create a thin oxide layer and

Question:

Spherical aluminum powder (SAP) 0.002 mm in diameter is treated to create a thin oxide layer and is then used to produce a SAP dispersion-strengthened material containing 10 vol% Al2O3. Calculate the average thickness of the oxide film prior to compaction and sintering of the powders into the part.