Caracterización mecánica de discos de hidroxiapatita nanoporosos obtenidos por sinterización//Mechanical characterization ofnanoporous hydroxyapatite disks obtained by sintering

Authors

  • Meylí Valin-Fernández Universidade de São Paulo, Brasil Departamento de Mecatrônica e de Sistemas Mecânicos. São Paulo,

Abstract

El objetivo de este trabajo es la caracterización mecánica de discos fabricados a partir de polvos de hidroxiapatita (HA) sintética cubana y de la StremChemicals – USA, con tamaños de partículas diferentes y de forma semiesféricas con superficies porosas, sin aditivos formadores de poros, por compactación uniaxial y sinterización en horno eléctrico a diferentes regímenes de sinterización, Se obtuvieron porosidades aparente entre 3 y 40 % con tamaños de poros entre 18 y 100nm, dimensiones menores a 20 mm de diámetro y 2 mm de espesor. Se evaluó la dureza mediante el ensayo de microdureza Vickers y la tenacidad a la fractura a travésdel ensayo de compresión diametral. Muestras con polvos de mayor tamaño de partículas presentaron comportamiento no lineal con la porosidad en los valores de dureza y de tenacidad a la fractura. Las muestras con menor tamaño medio de polvos presentaron resultados superiores. 

Palabras claves: hidroxiapatita, sinterización, porosidad.
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Abstract

The objective of this work is the mechanical characterization of disks made from Cuban synthetic hydroxyapatite (HA) and Strem Chemicals - USA powders. With different particle sizes and semi-spherical shape with porous surfaces. Without pore-forming additives, by uniaxial compaction and sintering in electric furnace at different sintering regimes. Obtaining ranges of apparent porosities between 3 and 40%, with pore sizes between 18 and 100 nm and their dimensions smaller than 20 mm in diameter and 2 mm thick. The hardness, fracture toughness and diametrical compression of the discs were evaluated. To determine the hardness, the Vickers microhardness test and fracture toughness were used for the radial cracking and palmqvist analysis method produced by Vickers prints. Samples with larger particle size powders presented behavior in the values of hardness and toughness to nonlinear fracture with porosity. In general, the samples with lower mean powder size presented higher results.

Key words: hydroxyapatite, sintering, porosity.

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Published

2017-09-02

How to Cite

1.
Valin-Fernández M. Caracterización mecánica de discos de hidroxiapatita nanoporosos obtenidos por sinterización//Mechanical characterization ofnanoporous hydroxyapatite disks obtained by sintering. Ing. Mec. [Internet]. 2017 Sep. 2 [cited 2025 Sep. 13];20(3):144-51. Available from: https://ingenieriamecanica.cujae.edu.cu/index.php/revistaim/article/view/570

Issue

Vol. 20 No. 3 (2017): septiembre-diciembre

Section

Original article

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