Effect of thermal processing on characteristics of nanopowders of hydroxyapatite

Bakunova, N. V.; Komlev, V. S.; Shvorneva, L. I.; Fedotov, A. Yu.; Фомин, А. С.; Баринов, С. М.; Иевлев, В. М.; Ponomarev, Yu. A.; Soldatenko, Sergei

doi:10.1134/s2075113311010035

Cited by 2 publications

(2 citation statements)

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“…It is shown that heat treatment at 800 °C of the nanopowders synthesized from Ca 10 (PO 4 ) 6 (OH) 2−x F x solutions (x = 1; 1.5; 2) leads to their coarsening, with the nanodimensional particle size being preserved, and that the ceramic samples obtained on their basis consist of smaller crystals and possess greater strength, in agreement with the known data [4,5].…”

Section: Discussionsupporting

confidence: 81%

“…The disadvantage of HAP-based bioceramics is a low mechanical strength, which limits its use for the elimination of defects in bone tissues experiencing regular and significant mechanical stresses [3]. A better durability can be achieved by transition to nanostructured materials, since ceramics based on such powders is characterized by a homogeneous structure, a near-zero open porosity, a small crystal size and increased strength [4,5]. The small particle size and narrow size distribution of the initial powder aggregates suggest that it is possible to obtain ceramics with a homogeneous fine crystalline structure [6].…”

Section: Introductionmentioning

confidence: 99%

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Formation of nanodimensional structures in precipitated hydroxyapatite by fluorine substitution

et al. 2020

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Hydroxyapatite Ca 10 (PO 4) 6 (OH) 2 is a bioactive compound, which is of great interest for medical application as a component of artificial bones and implants. The modification of its composition via anion and cation substitution can strongly affect its properties due to the formation of nanosized particles in the basic structure. In this work the influence of fluorine substitution of hydroxyl groups is examined. The powders of fluorine-substituted hydroxyapatite Ca 10 (PO 4) 6 (OH) 2−x F x (x = 1; 1.5; 2) were precipitated by chemical condensation from solutions. Such characteristics of powders as phase composition, morphology, particle size distribution, density, specific surface area have been studied. It was established that partial replacement of hydroxyl groups by fluorine leads to a decrease in the particle size to 10 nm. The degree of substitution affects the mechanical properties of synthesized powders and ceramics after annealing. A comparison of the particle size distribution in the initial samples and the distribution of grains in the sintered ceramics confirmed that the ceramics inherits the structure of the powders, which has a positive effect on its strength characteristics.

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Section: Discussionsupporting

confidence: 81%