ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Due to their excellent properties of high strength, biocompatibility and stability inphysiological environments, ceramics are investigated as bone substitute materials. In this wayceramic components have been used for total hip replacement components since the early 1970s.Alumina and zirconia monoliths are mainly used for these components. However, zirconia canundergo low temperature degradation in aqueous environment and alumina is brittle.To increase the strength, functionally graded Al2O3/ZrO2 ball-heads and acetabular cup inserts weremade in this work by electrophoretic deposition (EPD). A composition gradient in alumina andzirconia was engineered to obtain a pure alumina surface region and a homogeneousalumina/zirconia core with intermediate continuously graded regions to generate thermal residualstresses at the surface after sintering.Experimental work revealed that a sequence of counter-electrodes was necessary to EPD complexshaped functionally graded material (FGM) components. To obtain deposits with a shape differentfrom the deposition electrode, the deposit was grown up to the counter-electrode and the design ofthe counter-electrodes was supported by electrical field calculations to generate a constant electricfield at the surface of the deposition electrode
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.314.213.pdf
Permalink
