Method for preparing hydroxyapatite ceramic through combination of microwave hydrothermal method and microwave sintering method

Abstract

The invention relates to a method for preparing hydroxyapatite ceramic by combining a microwave hydrothermal method and a microwave sintering method. The method comprises the following steps: firstly,mixing a calcium chloride water solution with a disodium hydrogen phosphate water solution through an ultrasonic spraying method, then transferring the mixed solution into a microwave reactor to carry out reactions to obtain nano scale hydroxyapatite powder, finally, pressing the powder into a green body, and carrying out microwave sintering molding. By adopting the method, the hydroxyapatite powder with good dispersity and high crystallinity can be rapidly prepared in a large scale in a short time, the sintering temperature is reduced, the sintering time is shortened in the sintering process, the grain growth is effectively inhibited, and the prepared ceramic has higher strength and better performance.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a method for preparing hydroxyapatite ceramics by combining a microwave hydrothermal method and a microwave sintering method. Background technique [0002] Hydroxyapatite is an excellent biomedical material with good biocompatibility and is the main component of human bones and teeth. Since the 1970s, artificially synthesized hydroxyapatite materials began to be gradually applied to the repair of human hard tissue injuries. In the late 1970s, hydroxyapatite was used as a root implant material in dental restorations. In the 1990s, researchers began to use Focus on the mechanical properties and osteoinductivity of hydroxyapatite ceramics. As a bone repair material, hydroxyapatite can be made into various forms of bone repair materials according to the severity of the damaged part and the shape of the bone defect, such as nanoparticles, dense ceramics, micr...

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Problems solved by technology

[0003] Hydroxyapatite ceramics have excellent biocompatibility and osteoinductivity, and can be directly implanted into the human body as surgical implant materials to repair damaged hip joints and other bone tissues in the human body. However, the mechanical properties of hydroxyapatite ceramics Poor, low bending strength, difficult to be widely used in load-bearing joints

[0004] Xu Yubin from South China University of Technology (Xu Yubin. Preparation of highly bioactive hydroxyapatite ceramics and its properties by infiltration and coating modification [D]. Guangzhou: South China University of Technology, 2018) through the method of infiltration modification and coating modification , doping zinc ions and silicon ions into hydroxyapatite ceramics improves the activity and degradation performance of hydroxyapatite ceramics, and the compressive strength of hydroxyapatite ceramics infiltrated by zinc ions is significantly improved, but The sintering temperature of this hydroxyapatite ceramic is as high as 1250°C for 2 hours, which not only consumes more energy but also tends to cause abnormal grain growth.

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