Preparation method of homoporous biological ceramic implant material having gradient calcium and phosphor content

Abstract

The invention relates to a preparation method of a homoporous biological ceramic implant material having gradient calcium and phosphor content. The preparation method comprises the following steps of 1, low-temperature electrolyte preparation: preparing an electrolyte having a calcium ion concentration C(Ca) of 8-30mmol/L and a phosphorus ion concentration C(P) of 2-5mmol/L by deionized water, freezing deionized water and putting the freezed deionized water into the electrolyte to obtain an ice-water mixed low-temperature electrolyte, and 2, micro-arc oxidation treatment on titanium or a titanium alloy in the low-temperature electrolyte. Micropores of the ceramic membrane on the surface of the implant material have the same sizes and are uniform; gradient calcium and phosphor content is realized in the membrane and the inner membrane contains more calcium and phosphor elements; compared with a bone-implant interface mature period of the existing titanium implant tooth, a bone-implant interface mature period of the homoporous biological ceramic implant material is shortened to be within 3 months from 3-6 months; and biological properties satisfy prescribes of ISO, Chinese pharmacopoeia and American pharmacopeia.

Description

technical field [0001] The invention relates to a preparation method of a biomedical implant material, in particular to a preparation method of a fine-pore bioceramic implant material containing calcium and phosphorus elements. Background technique [0002] Titanium and titanium alloys are implant materials with a wide range of applications. They have good biocompatibility, but they have no biological activity. It is difficult to form a chemical bond with bone directly in the early stage of implantation, and the healing time is long. In order to improve its biological activity, plasma spraying, ion sputtering, electrophoresis, microwave sintering and other technologies are currently used to prepare hydroxyapatite and bioactive glass coatings on its surface, or to prepare titanium dioxide or sodium titanate by chemical activation treatment. Gel bioactive films, but these coatings or films have obvious interfaces with titanium and titanium alloy substrates, and the bonding str...

AI Technical Summary

Problems solved by technology

However, due to the influence of the unchangeable concentration of calcium and phosphorus ions in the electrolyte, the inner layer of the ceramic layer contains less calcium and phosphorus elements, and the entire ceramic layer lacks the necessary gradient of calcium and phosphorus content; also due to the limitation of the temperature of the electrolyte (usually 40°C), so that the oxidation voltage and frequency of the process should not be too high, and the pores formed are not ideal

Therefore, it is difficult for the ceramic layer to obtain the calcium and phosphorus content and pore structure that are beneficial to the initial osteoinduction and osseointegration of the implant.

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