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High performance alumina bioceramic sintered under normal pressure and low temp

A bio-ceramic, low-temperature sintering technology, applied in medical science, prosthesis, etc., can solve the problems of reducing alumina, affecting the strength of materials, adverse effects on the biological properties of materials, etc., to achieve the effect of promoting sintering and excellent comprehensive mechanical properties

Inactive Publication Date: 2003-07-23
WUHAN UNIV OF TECH
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Problems solved by technology

However, after the material is sintered, the liquid phase sintering additive often remains in the form of glass phase on the grain boundary, which affects the final strength of the material, while the pure solid phase sintering additive can only reduce the sintering temperature of alumina, but cannot improve the oxidation rate. The comprehensive mechanical properties of aluminum ceramics, and some sintering additives have adverse effects on the biological properties of materials

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  • High performance alumina bioceramic sintered under normal pressure and low temp
  • High performance alumina bioceramic sintered under normal pressure and low temp
  • High performance alumina bioceramic sintered under normal pressure and low temp

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Embodiment Construction

[0030] First, use α-Al with a purity of 99.9% and an average particle size of 0.35 μm 2 o 3 The powder is prepared according to the material-water ratio of 1:3 and the α-Al 2 o 3 Suspension; Mg(NO 3 ) 2 ·6H 2 O, ZrOCl 2 ·8H 2 O+Y 2 o 3 +HCl(3mol%Y 2 o 3 Stable ZrO 2 ) and other aqueous solutions, and mixed so that the concentration of the mixed solution is 1mol / L; the precipitation coating method is used to mix the materials, and while fully stirring, the α-Al 2 o 3 The suspension is introduced into the mixed solution, MgO-ZrO 2 (Y 2 o 3 ) The total weight percentage of the composite additive remains 4%, and excessive 1mol / L ammonia water is added dropwise in the mixture, and its precipitation is complete under the condition that the pH value is 9; Using ultrasonic cavitation to disperse the agglomerates, which is conducive to the uniform dispersion of small particles of additives into α-Al 2 o 3 Particles go in the primary particle.

[0031] Then, dehydrate...

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Abstract

A high-performance bioceramics of aluminium oxide is prepared through preparing alpha-Al2O3 suspension, preparing mixed MgO-ZrO2 (Y2O3) solution, mixing in ammonia water by deposition-inclusion method, dewatering with alcohol, baking, grinding, calcining at 1280 deg.c to obtain aluminium powder, adding adhesive, cold isostatic die pressing, precalcining at 1150 deg.C, coarse processing, and sintering at 1600 deg.C for 2.5 hr. Its advantages are low-temp sinter and excellent mechanical performance.

Description

1. Technical field: [0001] The invention relates to a sintering process of alumina bioceramics. 2. Background technology: [0002] As a biomaterial, alumina ceramics (α-Al 2 o 3 ) has the characteristics of high mechanical strength, high hardness, good wear resistance, stable physical and chemical properties, strong corrosion resistance, long-term stable existence in body fluid environment, excellent biological inertia and biocompatibility. Alumina ceramics are widely used clinically as hard tissue replacements, especially femoral head materials for artificial joints. However, pure alumina ceramics are generally difficult to sinter because the sintering temperature is very high, usually between 1700°C and 2000°C, and hot pressing, atmosphere or vacuum conditions are often required. In order to improve the sintering performance of alumina ceramics and reduce its sintering temperature, different types and dosages of additives are often added to the raw materials according t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L27/10C04B35/10C04B35/622C04B35/64
Inventor 王欣宇李世普陈晓明贺建华阎玉华戴红莲
Owner WUHAN UNIV OF TECH
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