Method for preparing hydroxylapatite coating by cold spraying

Abstract

The invention discloses a method for preparing a hydroxylapatite coating by cold spraying, which belongs to the field of implant processing and preparation in biomedical material engineering. The method adopts cold spraying equipment to spray dried hydroxylapatite powder onto a matrix of a biomedical implant metal material with the surface subjected to sand blasting treatment, thereby obtaining the hydroxylapatite coating with high crystallinity and good biological stability. The method can effectively avoid the thermal decomposition of sprayed powder, namely hydroxylapatite during the processing, can reduce the non-crystallization and hydroxyl loss, has small influence on an organization structure of the material, retains a structure of the originally spayed HA powder, and does not generate impurity phases. The hydroxylapatite powder used by the sprayed powder can realize the full recovery, which saves the powder for spraying in a large quantity. The method can prepare the hydroxylapatite coating on the surfaces of implant metal materials to ensure that the surfaces of biologically inert metal matrixes have biological activity, and can prepare medical implant devices such as dental roots, artificial joints and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of biomedical implant materials, and in particular relates to a method for preparing a hydroxyapatite coating by cold spraying. Background technique [0002] Hydroxyapatite (HA) coatings based on metal materials have become a focus in the application and research of biomedical implants. The HA coating was prepared on the metal surface by plasma spraying technology, and the artificial bone and artificial tooth root prepared by this method have been successfully applied clinically. However, phenomena such as amorphization, recrystallization, and thermal decomposition occur in the traditional plasma spraying process, and the coating has high impurity phase content, low crystallinity, and too fast dissolution in the body, resulting in coating peeling off. At the same time, the residual stress of the coating will be caused during the spraying process, which will obviously affect the mechanical pro...

AI Technical Summary

Problems solved by technology

However, in the process of traditional plasma spraying, phenomena such as amorphization, recrystallization and thermal decomposition occur, the coating has high impurity content, low crystallinity, and too fast dissolution in the body, resulting in coating peeling

At the same time, the residual stress of the coating will be caused during the spraying process, which will significantly affect the mechanical properties and biological properties of HA.