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ADVANCED MATERIALS AND COMPOSITES: FROM POWDER TO PART

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ADVANCED MATERIALS AND COMPOSITES: FROM POWDER TO PART

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    1. ADVANCED MATERIALS AND COMPOSITES: FROM POWDER TO PART Assoc. Prof. Dr. Alpagut KARA

    2. MANUFACTURE

    3. MANUFACTURE

    4. MANUFACTURE - Raw materials and additives

    5. MANUFACTURE - Raw materials and additives

    6. There are two possibilities: a) The ceramic manufacturer acquires the necessary raw materials and carries out all further processing tasks. Specific preparations of unfired material are required for the different forming processes:

    7. MANUFACTURE - Body preparation

    8. Methods of shaping ceramic parts can be divided into the following basic types: pressing (0 15 % moisture) plastic forming (15-25 % moisture) casting (> 25 % moisture), and others.

    9. MANUFACTURE Forming ? Dry pressing

    10. MANUFACTURE Forming ? Isostatic pressing

    11. Allows the manufacture of parts with complex geometries such as screw threads, side holes, recesses and undercuts. The unfired material used for this purpose usually has moisture levels in the range of 10 to 15%. Compressing with a single axis makes these materials able to flow freely, so that relatively even compression can be achieved. The disadvantage of this, however, is that wet pressing materials can accept only low compressive strains. This also means that the degree of compression is limited. It depends heavily on the moisture content of the unfired material, and is lower than in the case of dry pressed parts. MANUFACTURE Forming ? Wet pressing

    12. MANUFACTURE Forming ? Extrusion

    13. Principally suited to the mass production of complex products. It is limited by relatively high die costs and the complex burnout of organic additives. The conveying capacity ("shot weight") of large injection moulding machines is typically up to about 70g. Generally, the part should be designed so that thicknesses are as consistent as possible, having an upper limit of approx. 12 mm. MANUFACTURE Forming ? Injection Moulding

    14. A simple method for the manufacture of prototypes, parts with complex geometries and relatively large items. It can be used to manufacture both thin-walled and solid objects. Ceramic slip casting involves a stable suspension, referred to as the slip, being poured into a porous, absorbent plaster mould. Extraction of the suspending liquid causes a layer of particles to develop on the mould wall. This layer develops, in solid casting, to create the fully molded body. In the case of hollow casting, the superfluous slip is poured out once the desired wall thickness has been achieved. MANUFACTURE Forming ? Slip Casting

    15. MANUFACTURE Forming ? Tape Casting

    16. MANUFACTURE

    18. FROM FORMING TO FIRING

    19. FIRING

    20. FIRING

    21. FIRING

    22. DIMENSIONS & SHRINKAGE

    23. DIMENSIONS & SHRINKAGE

    24. MACHINING

    25. MACHINING Green machining

    26. MACHINING White machining

    27. FINAL MACHINING Hard machining

    28. FINAL MACHINING Possible finishing processes

    29. Ground Surfaces

    30. Ground Surfaces

    31. HONED SURFACES

    32. LAPPED SURFACES

    33. LAPPED SURFACES - Model of material removal by lapping

    34. POLISHED SURFACES

    35. CERAMIC COATINGS

    36. CERAMIC COATINGS

    37. CERAMIC COATINGS

    38. CERAMIC COATINGS

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