PRE-TREATMENT OF METALLIC BASE MATERIAL SURFACE

• Main Authors: YAMAGIWA KATSUYA, OKUYAMA MASAHIKO, MIZUSHIMA YASUYUKI
• Format: Patent
• Language: English
• Published: 07.10.1997
• Edition: 6
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

PROBLEM TO BE SOLVED: To provide a pre-treating method for easily wetting the surface of a metallic base material by a remarkably simple operation that the metallic base material is brought into contact with an aq. solution, containing an alkali compound or hydrogen peroxide, or a hot water or steam. SOLUTION: The metallic base material is dipped into the aq. solution containing 10mol/l alkali compound such as sodium hydroxide, potassium hydroxide or hydrogen peroxide, for example, for 3hr in the boiling state and by the pre-treatment, the contact angle particularly of an aq. solution or the like to the surface of the metallic base material is lowered to improve the wettability. A coating film composed of a calcium phosphate based sintered compact is formed on the surface of the metallic base material by applying an aq. solution containing calcium phosphate, heat treating and sintering. Particularly if the metallic base material is used for a in-vivo hard tissue substitutive member, the in-vivo hard tissue substitutive member having excellent strength and bioactivity is obtained.