Whitlockite coating constructed on surface of calcium phosphate-based bioceramic substrate and preparation method therefor

A method for constructing a whitlockite coating on a surface of a calcium phosphate-based bioceramic substrate comprising the steps of:

• (1) pre-firing, shaping and calcining a pure calcium phosphate-based bioceramic powder to obtain the calcium phosphate-based bioceramic substrate, wherein the pre-firing is conducted at a temperature ranging from 700° C. to 900° C. for 2 hours to 4 hours, and the calcining is conducted at a temperature ranging from 900° C. to 1100° C. for 2 hours to 4 hours;
• (2) placing the calcium phosphate-based bioceramic substrate in a solution containing Mg2+, and then transferring the calcium phosphate-based bioceramic substrate to a reaction kettle for a hydrothermal reaction to obtain a sample, wherein the pH of the solution containing Mg2+ ranges from 5.4 to 7.4;
• the volume mass ratio of the solution containing Mg2+ to the calcium phosphate-based bioceramic substrate ranges from 0.3 L/g to 2.4 L/g;
• the temperature of the hydrothermal reaction ranges from 80° C. to 120° C., and the time of the hydrothermal reaction ranges from 6 hours to 5 days;
• and
• (3) taking out the sample after the hydrothermal reaction in step (2) from the reaction kettle, and then cleaning and drying the sample to obtain the whitlockite coating on the surface of the sample, wherein the chemical formula of the whitlockite is Ca18Mg2(HPO4)2(PO4)12.