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HPAM Paul 2 - Coggle Diagram

- - - - Civil = Efficient from large fan
      - Military = smaller fan, don't need large CSA because drag
    - - Affected by engine type, different for different flight profiles
      - :arrow_up: temp and pressure at compression
        :arrow_down: temp and pressure at entry and exhaust
      - Materials: Ti at front, Ni at back
  - - - Hotter outer casing but better efficiency
      - ZrO2 on Ni subtrate on Hatelloy X = reduce thermal conductivity to metal
  - - - Blade disk LFW = lighter and more efficient
  - - - Superalloys = high melting point, higher weight
      - High \(\gamma'\) volume (70%)
      - Dislocations pinned by Ni3Al phase, narrow \(\gamma\) channels restrict dislocation movement + rhenium sitting in channels
    - - Cooling channels in centre
      - High load on disk
    - - TBC = oxygen transport = needs oxidation coating
      - Oxidation coat = Boat coat as TBC sticks to it
      - Allows higher surface temps than melting point of substrate
- - - - Hot work in \(\alpha\) phase = fine equiax alpha grains
      - Slow cool from beta phase field = widmanstatten
        serrated if high purity
        delinated if beta stabilisers present