IMPROVED SINTERING METHOD FOR MANUFACTURING THIN FILM OF CALCIUM PHOSPHATE MATERIAL

• Main Authors: SMITH TIMOTHY J N, PUGH SYDNEY M
• Format: Patent
• Language: English
• Published: 29.07.2004
• Edition: 7
• Subjects: ARTIFICIAL STONE; BANDAGES, DRESSINGS OR ABSORBENT PADS; CEMENTS; CERAMICS; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; COMPOUNDS THEREOF; CONCRETE; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; FILTERS IMPLANTABLE INTO BLOOD VESSELS; FIRST-AID KITS; FOMENTATION; GLASS; HUMAN NECESSITIES; HYGIENE; INORGANIC CHEMISTRY; JOINING GLASS TO GLASS OR OTHER MATERIALS; LIME, MAGNESIA; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES; MEDICAL OR VETERINARY SCIENCE; METALLURGY; METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL; MINERAL OR SLAG WOOL; NON-METALLIC ELEMENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; PROSTHESES; REFRACTORIES; SLAG; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; TREATMENT OF NATURAL STONE; TREATMENT OR PROTECTION OF EYES OR EARS

PROBLEM TO BE SOLVED: To provide an improved manufacturing method (containing optimal sintering temperature and the like) of a thin film of a calcium phosphate material capable of supporting osteocyte activity on the thin film. SOLUTION: The sintered material is prepared by a mixing ammonium phosphate solution and a calcium nitrate solution to form hydroxyapatite-containing sol-gel. This sol-gel film is put on at least one side of a base layer, and a film is coated on the base layer and sintered to form a solid film of a calcium phosphate material. Hydroxyapatite is changed into α calcium triphosphate in the sintering step, and the changing degree shows the temperature dependency. The optimal composition is 50:50 to 20:80 in the ratio of the hydroxyapatite to the α tricalcium phosphate, and the sintering temperature is selected from the range of 920 to 1,100°C to obtain the optimal composition. The higher is the selected temperature in the range, the higher the ratio of α tricalcium phosphate is. COPYRIGHT: (C)2004,JPO&NCIPI