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Powder Metallurgy (PM) is going to play an important role in manufacturing in all sectors in the future, including aerospace, as it combines ease of alloying with net shape capabilities, design freedom and high performance. Each PM process has distinctive features, uses dedicated metal powders, and delivers materials that rival the properties of conventionally produced parts, with a constantly increasing portfolio, and penetration in many sectors, including automotive and aerospace, is also increasing. Especially, Additive Manufacturing gives unprecedented possibilities of weight optimization. In this review, a number of examples of applications in aerospace taken from the available literature are shown.

The anisotropic dimensional changes during sintering was investigated for rings made of eight different materials with different green densities and H/(Dext-Dint) ratio. Dimensional changes are affected by green density, as shown in previous works, while the geometrical parameter does not display a clear influence. The anisotropy parameter K defined in a previous work does not describe anisotropy of dimensional change unambiguously, due to the anisotropy of shrinkage/swelling in the compaction plane. A new anisotropy parameter (K3D) was therefore defined considering the dimensional changes of internal diameter, external diameter, and height. This parameter display an unambiguous dependence on the equivalent isotropic dimensional change and will be used in further work to develop a predictive model for the prediction of the anisotropic dimensional change during sintering of parts with different green density and geometry.

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