Disclosed is a method for producing a transparent and homogenized
polymeric sol of a calcium phosphate compound, containing apatite and
having excellent wettability and bioactivity, according to a sol-gel
synthesis, and a method for coating the polymeric sol on a metal implant,
in which the polymeric sol is coated on the metal implant and then
heat-treated to form a dense coated layer strongly bonded to the metal
implant. The polymeric sol is obtained by process of preparing a calcium
salt solution, containing calcium ethoxide dissolved in organic acid, and
a phosphate solution, containing triethyl phosphite or triethyl phosphate
dissolved in the organic acid, mixing the calcium salt solution with the
phosphate solution to produce a mixed solution, and aging the mixed
solution.