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- W2022983184 abstract "Abstract Abstract Near net-shaped bodies of hydroxyapatite (HA), Ca10(PO4)6(OH)2, have been fabricated by a novel process: the oxidation of solid, metal-bearing precursors. High-energy mechanical alloying was used to produce an intimate powder mixture of metallic calcium and calcium pyrophosphate, β-Ca2P2O7, that possessed an overall stoichiometry consistent with HA (molar Ca:Ca2P2O7 ratio = 4:3). The milled Ca-Ca2P2O7 mixtures were sufficiently malleable as to allow for compaction and forming (pressing, machining) into shaped green bodies with relatively high densities (80-86%). The green bodies were converted into phase-pure HA through heat treatments at 500-600°C in dry oxygen (for Ca oxidation), 850°C in moist oxygen or air (for HA formation), and 1100-1150°C in moist oxygen or air (for sintering). The offsetting volume changes associated with calcium oxidation (Vm(CaO) < Vm(Ca)) and subsequent HA formation (Vm(HA) > 4Vm(CaO) + 3Vm(Ca2P2O7)) resulted in HA bodies that retained the shapes and dimensions (to within a few percent) of the metal-bearing precursors." @default.
- W2022983184 created "2016-06-24" @default.
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- W2022983184 date "2000-01-01" @default.
- W2022983184 modified "2023-10-18" @default.
- W2022983184 title "The Fabrication of Near Net-Shaped Hydroxyapatite Ceramics by the Oxidation of Solid, Metal-Bearing Precursors" @default.
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- W2022983184 doi "https://doi.org/10.1080/10426910008912971" @default.
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