Medical porous alumina based ceramic composite material
A technology of porous alumina and composite materials, applied in the field of medical porous alumina-based ceramic composite materials, can solve the problems of unfavorable bone cell adhesion, high density, affecting the combination of implant materials and surrounding tissues, etc.
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Embodiment 1
[0012] Embodiment 1: Calcium fluoride, aluminum oxide, and diopside are prepared as raw materials according to the mass percentage of calcium fluoride 1%, aluminum oxide 98%, and diopside 1%. Alumina balls are used for mixing and ball milling, and the powder after ball milling passes through a 100-mesh sieve to obtain a mixed powder. Put the mixed powder into a graphite mold for compression molding, hot press sintering under nitrogen atmosphere, sintering temperature 1450°C, sintering pressure 30 MPa, sintering time 1 hour, heat preservation 30 minutes. The obtained alumina-based medical ceramic composite has a Rockwell hardness (HRA) of 90.67, a flexural strength of 381.3 MPa, and a fracture toughness of 4.68 MPa m 1 / 2 . The sintered samples were cut into 3.3mm×4.3mm×36mm specimens with an internal microtome, and after rough grinding, fine grinding and polishing, they were cleaned ultrasonically. Then, put them into the prepared simulated body fluid respectively. The sampl...
Embodiment 2
[0013] Embodiment two: other is with embodiment one, and difference is that calcium fluoride, aluminum oxide, diopside prepare raw material by the mass percentage of calcium fluoride 4%, aluminum oxide 95%, diopside 1%. The Rockwell hardness (HRA) of the prepared alumina-based ceramic composite is 90.37, the flexural strength is 474.1MPa, and the fracture toughness is 4.67MPa m 1 / 2 . After testing, there are a large number of pores on the surface, and a large amount of hydroxycarbonate apatite deposits are formed on the surface of the sample soaked in simulated body fluid, and the composite material has good biological activity.
Embodiment 3
[0014] Embodiment three: other is the same as embodiment one, and difference is that calcium fluoride, aluminum oxide, diopside prepare raw material by the mass percentage of calcium fluoride 8%, aluminum oxide 90%, diopside 2%. The Vickers hardness HV of the prepared alumina-based bioceramic composite is 17.40GPa, the flexural strength is 446MPa, and the fracture toughness is 4.66MPa m 1 / 2 . After testing, there are a large number of pores on the surface. The samples soaked in simulated body fluids were analyzed by SEM, and the deposits formed on the surface were bone-like apatite-hydroxycarbonated apatite.
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