Method for preparing aluminum oxide-based composite biological ceramic material through in-situ reaction, and product prepared by method

Abstract

The invention discloses a method for preparing an aluminum oxide-based composite biological ceramic material by in-situ reaction. The method comprises the following steps: by using aluminum oxide, 3 mol% Y2O3-stabilized zirconium oxide and praseodymium nitrate as raw materials, carrying out ball-milling mixing, heating and rotary drying to obtain precursor powder; and granulating the precursor powder, carrying out dry pressing molding to obtain a ceramic green body, heating to 1400-1600 DEG C at a speed of 5-15 DEG C/min in an air atmosphere, carrying out heat preservation for 0.5-1.5 h, and carrying out furnace cooling to obtain the in-situ growth tabular crystal toughened alumina-based composite biological ceramic material. The invention also discloses a product prepared by the preparation method. According to the invention, the method is simple and convenient in process; and the toughening phase which is subjected to normal-pressure low-temperature sintering and in-situ synthesis isuniformly dispersed and is well combined with a matrix interface, the microstructure is uniform, and the compactness is high, so that the material has excellent mechanical properties and is suitablefor industrial mass production.

Description

technical field [0001] The invention relates to the technical field of medical biomaterials, in particular to a method for preparing an alumina-based composite bioceramic material by in-situ reaction and a product thereof. Background technique [0002] Alumina (Al 2 o 3 ) Ceramics have high hardness, excellent wear resistance and corrosion resistance, biocompatibility and biological inertness, so they are considered to be ideal artificial joint prosthesis, but there are also structural ceramics with high brittleness and low reliability. The inherent disadvantages limit its application as a bioceramic. [0003] The strength of single-phase alumina ceramics is usually 400-500MPa, and the fracture toughness is 3-4MPa m 1 / 2 about. However, the brittleness or toughness of the material at room temperature is affected by multiple factors such as the composition, structure, stress environment and conditions of the material, and the different microstructures inside the material w...

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Problems solved by technology

The second is to use various toughening methods to improve the dispersion mechanism of ceramic materials to applied stress, so that the material is less sensitive to defects.

[0005] The study found that the introduction of SiC whiskers into the alumina matrix can greatly improve the fracture toughness of the material, but the structure is easily destroyed due to the whiskers in the mass production, dispersion and subsequent sintering process, and the added whiskers and the matrix There are differences in chemical compatibility and physical thermal expansion coefficient, so the surface modification of whiskers is required; at the same time, due to the low molding density, it is not easy to sinter and compact, and a special sintering method is required, so the application of this method is restricted. restricted

The in-situ growth of plate-shaped crystals eliminates the difficulties caused by the use of whiskers in the process. Compared with single-phase alumina ceramics, although the mechanical properties have been greatly improved, there are still liquid phases and seeds in the alumina matrix. It is not easy to disperse evenly in the medium, the bonding performance with the matrix is ​​not good, and hot pressing sintering is required, which is not conducive to the realization of industrialized mass production

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