Hydroxy apatite-base composite bioceramic material, and its preparing process

A technology of composite bioceramics and hydroxyapatite, which is applied in the interdisciplinary field of materials science and biomedicine, can solve the problems of difficulty in synthesizing required materials, high cost of carbon nanotube preparation, and large fluctuation range of mechanical properties of composite materials. Achieve the effects of lowering the sintering temperature, reducing the resistance of diffusion and mass transfer, and accelerating the flow and mass transfer speed

Inactive Publication Date: 2008-08-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of carbon nanotubes greatly increases the preparation cost, and the mechanical properties of the composite material fluctuate widely.
The test also found that when the mass content of carbon nanotubes exceeds 25%, due to the low density of carbon nanotubes, the positions of the matrix and the reinforcement phase are exchanged, and it is difficult to synthesize the required materials at a temperature of about 1300 ° C.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment one: hydroxyapatite, aluminum oxide, diopside are prepared raw material according to the mass percentage of hydroxyapatite 89.5%, aluminum oxide 10%, diopside 0.5%, adopt alumina ball to mix ball mill, milling time 70 Hours, the ball-milled powder passed through a 100-mesh sieve to obtain a mixed powder. Put the mixed powder into a graphite mold for compression molding, hot press sintering in a nitrogen atmosphere, the sintering temperature is 1320°C, the sintering pressure is 28MPa, the sintering time is 1 hour, and the heat preservation is 30 minutes. The obtained hydroxyapatite-based composite bioceramic material has a Vickers hardness of HV4.0GPa, a flexural strength of 103MPa, and a fracture toughness of 2.50MPa m 1 / 2 .

Embodiment 2

[0013] Embodiment two: other is with embodiment one, difference is that hydroxyapatite, aluminum oxide, diopside prepare raw material by the mass percentage of hydroxyapatite 79%, aluminum oxide 20%, diopside 1%, sintering The temperature is 1300°C, the sintering pressure is 20MPa, and the heat preservation time is 40 minutes. The Vickers hardness of the prepared hydroxyapatite-based composite bioceramic material is HV4.64GPa, the bending strength is 128MPa, and the fracture toughness is 2.26MPa m 1 / 2 .

Embodiment 3

[0014] Embodiment three: other is with embodiment one, and difference is that hydroxyapatite, aluminum oxide, diopside prepare raw material by the mass percentage of hydroxyapatite 58%, aluminum oxide 40%, diopside 2%, sintering The temperature is 1310°C, the sintering pressure is 30MPa, and the heat preservation is 60 minutes. The Vickers hardness of the prepared hydroxyapatite-based composite bioceramic material is HV5.87GPa, the bending strength is 200MPa, and the fracture toughness is 2.78MPa m 1 / 2 .

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Abstract

The present invention relates to a composite biological ceramic material using hydroxyapatite as base body and using diopside and alumina as toughening reinforcing body. Its composition includes (by wt%) 58-89% of hydroxyapatite, 0.5-2% of diopside and 10-40% of alumina, and its preparation method includes the following steps: mixing materials, ball-grinding, hot-pressing and sintering, its sintering temperature is 1300-1320 deg.C and sintering pressure is 20-30 MPa, and its heat-insulating and pressure-holding time is 30-60 min.

Description

technical field [0001] The invention belongs to the intersecting field of material science and biomedicine, and particularly relates to a composite bioceramic material with hydroxyapatite ceramic material as a matrix and diopside and alumina as a toughening and reinforcing body and a preparation process thereof. Background technique [0002] Hydroxyapatite (Hydroxyapatite, HA or HAP) is a kind of biologically active material with good biocompatibility. inductive. However, due to its high brittleness, low flexural strength and fracture toughness, hydroxyapatite is strictly limited to use in non-dynamically loaded environments. Therefore, it is limited in the application of load-bearing materials, and its functionality is not outstanding. Whisker-reinforced HA composites have good toughening effect, but whiskers are considered as potential carcinogens. In addition, the whiskers used for reinforcement can enter the human body from hydroxyapatite, easily causing serious healt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61L27/12A61L27/10C04B35/447
Inventor 张希华李木森明凤刘长霞白允强徐明刚吕宇鹏
Owner SHANDONG UNIV
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