Structure and mechanical properties of hydroxyapatite bioceramic obtained by high temperature sintering

Procedia Structural Integrity Pub Date : 2026-01-01 Epub Date: 2026-05-01 DOI:10.1016/j.prostr.2026.04.003

Tsanka Dikova , Ivaylo Parushev , Dzhendo Dzhendov , Stanislav Mitkov , Vladimir Dunchev

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Abstract

The aim of the present study is to investigate the microstructure, phase composition, porosity and mechanical properties of hydroxyapatite (HA) bioceramics obtained by high-temperature sintering. Two groups of cylindrical specimens with height h=15 mm (Group 1) and h=30 mm (Group 2) were prepared by freeze drying method. Then the samples were sintered at 1450 ^oC temperature. The microstructure, phase composition, porosity and maximum breaking force of the samples were investigated by OM, XRD and compression test. It was found that after sintering, the phase composition of HA samples changed to biphasic: 66 % HA and 34 % tetra-calcium phosphate (TTCP). The sintered HA samples were characterized with inhomogeneous porous microstructure: dense at the bottom, well-shaped elliptical pores in the top layer and mostly lamellar pores in the middle. The top layer in the samples of Group 1 was thicker compared to Group 2. A large crack at the boundary between top porous layer and main volume as well as several large cracks inside the volume were observed. Inverse proportional relationship was confirmed between the porosity and breaking force in compression of the investigated bioceramic specimens: the average porosity in Group 1 (70.1 %) was higher than that in Group 2 (65.5 %) leading to fracture of the samples in the first group at lower force (173 N) compared to the second (350 N).

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高温烧结羟基磷灰石生物陶瓷的结构与力学性能

研究高温烧结羟基磷灰石（HA）生物陶瓷的微观结构、相组成、孔隙率和力学性能。采用冷冻干燥法制备高度h= 15mm（第1组）和h= 30mm（第2组）两组圆柱形标本。然后在1450℃的温度下进行烧结。通过OM、XRD和压缩试验研究了试样的显微组织、相组成、孔隙率和最大断裂力。结果表明，烧结后的羟基磷灰石样品的相组成变为双相：66%的羟基磷灰石和34%的四磷酸钙（TTCP）。烧结后的羟基磷灰石试样具有孔隙结构不均匀的特点：底部致密，顶部呈椭圆形孔隙，中间以层状孔隙为主。第1组样品的表层较第2组厚。在顶部多孔层与主体体的边界处观察到一个较大的裂纹，在主体体内部也观察到几个较大的裂纹。生物陶瓷试样在压缩过程中孔隙度与断裂力呈反比关系，组1的平均孔隙度（70.1%）高于组2的平均孔隙度（65.5%），导致组1试样在较低的压缩力（173 N）下断裂，组2试样在较低的压缩力（350 N）下断裂。

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来源期刊

Procedia Structural Integrity

CiteScore

1.70

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0.00%

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