Selective Laser Sintering of Calcium Phosphate Powders

dc.creatorLee, Gonhee
dc.creatorBarlow, J.W.
dc.date.accessioned2018-10-03T15:29:00Z
dc.date.available2018-10-03T15:29:00Z
dc.date.issued1994
dc.description.abstractSince Dejong first observed the similarity between powder X - ray diffraction pattern ofthe in vivo mineral and the hydroxyapatite (Cas(OH)(P04h ,HA) in 1926, the calcium phosphate ceramics have received attention as a bone substitute material. Five calcium phosphates which exhibit different X-ray diffraction patterns are known to be precipitated from aqueous solution at normal pressure. [1] These are Ca(HzP04h, Ca(HzP04h-H20, CaHP04 , CaHP04-2H20, and crystalline precipitate of variable composition of hydroxyapatite with the base formula Cas(OH)(P04h. Various forms of calcium phosphate compounds, Ca/P ratio range from 0.5 to 1, are prepared from HA by reacting with phosphoric acid. Thermally dehydrated calcium phosphates are known to form a CaO and P20 S binary system. It is known that for the CaO and P20S binary system, the chain phosphates appear between the orthophosphate (mole ratio ofCaO/P20 S =3) and metaphosphate (mole ratio ofCaO/P20s =1) and ultraphosphate for which mole ratio ofCaO/P20 s iess than 1. Particularly in the case ofmetaphosphate, very high degree of polymerization and as a consequence, good mechanical properties are reported. In this binary system, mole ratio ofCaO/P20 S less than 55145 forms a glass-like structure from the melt, and its mechanical properties are known to be nearly same as those of natural teeth.[2]en_US
dc.description.departmentMechanical Engineeringen_US
dc.identifierdoi:10.15781/T25D8P040
dc.identifier.urihttp://hdl.handle.net/2152/68645
dc.language.isoengen_US
dc.relation.ispartof1994 International Solid Freeform Fabrication Symposiumen_US
dc.rights.restrictionOpenen_US
dc.subjectselective laser sinteringen_US
dc.subjectPolymeric Binderen_US
dc.subjectPowder X-ray diffractionen_US
dc.titleSelective Laser Sintering of Calcium Phosphate Powdersen_US
dc.typeConference paperen_US

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