Presentation on theme: "Metal Foam Ryan McDonough. What is Metal Foam An ultra high strength metal matrix composite foam. The material can be any type of metal Even though it."— Presentation transcript:
Metal Foam Ryan McDonough
What is Metal Foam An ultra high strength metal matrix composite foam. The material can be any type of metal Even though it is metal it has interconnecting hollow pores Strong, light and somewhat elastic
How it Works Today metal foam is thought to be used for bone implants With normally titanium rod implants the bone and the titanium rod have a different modulus of elasticity The metal foam and bone have the same modulus of elasticity Allows bone cells and blood vessels to grow into the pores of the metal foam Normal metal implants carry more of the weight of the body then the bone does and can cause the surrounding bone to die.
How its made There are 2 ways to make the metal foam 1) Salt mold- involves pouring large grained salt into a mold, then the salt is heated and put under pressure so they fuse together Molten metal is then poured in the mold and fills in the spaces between the salt grains It is then cooled and dunked in water to dissolve the salt leaving only the metal foam
How its Made(continued) 2) Plaster mold- An open cell plastic foam is used to begin the process The foam is filled with a dissolvable plaster making plastic beams inside the plaster The mold is then heated which melts the plastic Molten metal is then squeezed into the plaster mold using high pressure and a vacuum The plaster is then dissolved and the foam is done
Benefits/ Limitations Benefits – Less likely for the bone to reject the implant – Use less of whatever metal that is being used Limitations – Takes a while to produce the foam – The process is expensive – Difficult to make
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