Tantalum coating on the surface of medical metals (stainless steel, titanium and titanium alloy) and its clinical application trend have become the future development trend. Titanium alloy has the characteristics of small specific gravity, high specific strength, low elastic modulus, easy processing and forming, rich raw material resources, etc., and has been developed into an ideal functional structural material for surgical implants. However, the complex human body environment will cause the corrosion of metal materials and lead to the release of toxic elements, thus reducing the biocompatibility; In addition, the elastic modulus of metal materials is too different from that of human bone tissue, which is easy to produce stress shielding effect, which is not conducive to the growth and remodeling of new bone.
It is a simple, quick and effective method to modify the surface of medical metal materials to improve their comprehensive properties. The preparation of tantalum coating on the surface of medical metal materials not only takes advantage of the performance advantages of the material, but also gives play to the characteristics of good biocompatibility of tantalum metal. At the same time, the high cost of completely using tantalum metal is reduced.
Tantalum metal coatings were prepared using chemical vapor permeation (cvi) equipment. By passing inert gas into the target heating furnace, the inert gas and tantalum target steam are diffused to the reaction chamber together to form tantalum coating on the surface of the workpiece to be plated. Because the inert gas atom impinges on the target steam to disperse it, it has good homogeneous plating ability and has the characteristic of strong diffraction ability. The back of the workpiece, groove and narrow seam can be coated.
A method for preparing tantalum coating by chemical vapor penetration (cvi) comprises: providing a chemical vapor penetration (cvi) device, wherein the chemical vapor penetration (cvi) device comprises a reaction chamber for holding the workpiece to be plated and a target heating furnace, wherein the target heating furnace is used to supply the target steam to the reaction chamber, the workpiece to be plated is placed in the reaction chamber, and the reaction chamber is vacuumized. The pretreatment successively includes the following operations: ultrasonic cleaning of distilled water and ultrasonic cleaning of stain remover.
