Method for preparing hydroxylapatite coating by microplasma spraying

Abstract

The invention discloses a method for preparing a hydroxylapatite coating by microplasma spraying, which belongs to the field of implant processing and preparation in biomedical material engineering. The method adopts microplasma 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 controllable crystallinity and good biological stability. The preparation of the coating by the method has simple process, and the hydroxylapatite powder has high deposition efficiency. The method can be used for depositing the hydroxylapatite coating on the surfaces of inert implant metal materials such as stainless steel, cobalt-based alloy, titanium and titanium alloy to make the surfaces of biologically inert metal matrixes biologically activated to 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 hydroxyapatite coating using a micro-beam plasma spraying method. Background technique [0002] In the past 10 years, the market growth rate of biomedical materials and products in the world has been maintained at around 20%-25%. The medical device industry, including medical materials, will reach the scale of the pharmaceutical products market, with large market demand, great development potential and large profits, and will become a pillar industry of the world economy in the 21st century. [0003] Hydroxyapatite (HA) is a widely used bioactive ceramic material. Its characteristics are: when combined with the original bone, no fibrous tissue will be produced at the interface, their surface can undergo selective chemical reaction with the physiological environment, and the formed interface can protect the implant. It is bonded ...

AI Technical Summary

Problems solved by technology

Therefore, plasma spraying with extremely high temperature is easy to decompose HA, and it is prone to premature dissolution and peeling after implantation in the organism, which cannot induce the growth of bone tissue, and the service life of the material is short

Second, the power consumption of traditional atmospheric plasma spraying is between 40-200kW, and the effective energy actually used for powder heating only accounts for 10-20% of the total power, and the powder deposition efficiency is low, only 20-50%, and the powder utilization rate Low

However, expensive high-purity HA powder needs to be used as raw material in the preparation of HA coating, resulting in huge waste