Method for preparing hydroxylapatite coating by cold spraying

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 surf