Metal Foam Ryan McDonough What is Metal Foam вЂў вЂў вЂў вЂў 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 вЂў вЂў вЂў вЂў вЂў 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 вЂў There are 2 ways to make the metal foam вЂў 1) Salt moldвЂў вЂў вЂў 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) вЂў 2) Plaster moldвЂў вЂў вЂў вЂў вЂў 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 вЂў вЂў Benefits вЂ“ Less likely for the bone to reject the implant вЂ“ Use less of whatever metal that is being used Limitations вЂ“ Takes a while to produce the foam вЂ“ The process is expensive вЂ“ Difficult to make Sources вЂў вЂў вЂў вЂў вЂў вЂў вЂў Vendra, L. "New Material Mimics Bone to Create Better Biomedical Implants." Science Daily: News & Articles in Science, Health, Environment & Technology. Science Daily, 16 Feb. 2010. Web. 19 Nov. 2011. <http://www.sciencedaily.com/releases/2010/02/100216113603.htm>. Michaels, Bob. "Composite Metal Foam Material Could Be Tomorrow's Knee Cap | Qmed." Qmed | Medical Device Industry Supplier Directory. Qmed, Apr. 2010. Web. 19 Nov. 2011. <http://www.qmed.com/mpmn/article/composite-metal-foammaterial-could-be-tomorrows-knee-cap>. Rugani, Lauren. "Metal Foam Could Build Better Bones, Car Bumpers." Science 2.0 - В® The World's Best Scientists, the Internet's Smartest Readers. Science 2.0, 19 Feb. 2010. Web. 19 Nov. 2011. <http://www.science20.com/futuro/metal_foam_could_build_better_bones_car_bumpers>. Kaiser, Tiffany. "Researchers Develop New Titanium Bone Implants." Daily Tech. Daily Tech, 23 Sept. 2010. Web. 19 Nov. 2011. <http://www.dailytech.com/Researchers+Develop+New+Titanium+Foam+Bone+Implants+/article19703.htm>. Morton, Todd. "Titanium Foam Scaffolds Made to Match Bone's Properties." Ars Technica. Ars. Web. 19 Nov. 2011. <http://arstechnica.com/science/news/2008/08/titanium-foam-scaffolds-made-to-match-bones-properties.ars>. "Metal 'foam' Developed for Bone Implants - UPI.com." Latest News, Latest News Headlines, News Articles, News Video, News Photos - UPI.com. UPI, 23 Sept. 2010. Web. 19 Nov. 2011. <http://www.upi.com/Science_News/2010/09/23/Metalfoam-developed-for-bone-implants/UPI-24901285293325/>. Curran, Dave. "People | Dave Curran | Metal Foams." Department of Materials Science & Metallurgy, University of Cambridge. Web. 19 Nov. 2011. <http://www.msm.cam.ac.uk/mmc/people/old/dave/dave.html>.