Patent ID: 7547448

Claim:
A bone replacement material comprising crystalline and X-ray amorphous phases, characterized in that a) according to 31 P-NMR measurements, the bone replacement material comprises Q 0 -groups of orthophosphate and Q 1 -groups of diphosphate, the orthophosphates or Q 0 -groups making up 70 to 99.9% by weight relative to the total phosphorus content of the finished material and the diphosphates or Q 1 -groups making up 0.1 to 30% by weight relative to the total phosphorus content of the finished material, and b) according to X-ray diffractometric measurements and relative to the total weight of the finished material, 30 to 99.9% by weight of a main crystal phase consisting of Ca 2 K 1−x Na 1+x (PO 4 ) 2 , where x=0.1 to 0.9, is contained in the bone replacement material and 0.1 to 20% by weight of a substance selected from the group consisting of Na 2 CaP 2 O 7 , K 2 CaP 2 O 7 , Ca 2 P 2 O 7 and the mixtures thereof is contained as a secondary crystal phase, and c) the X-ray amorphous phases contained besides the main crystal phase jointly make up 0.1 to 70% by weight relative to the total weight of the finished material, obtainable by mixing raw materials containing (in % by weight) 28-33 CaO, 8.5-13 Na 2 O, 9.5-15 K 2 O, 1.5-3 MgO and 0.1-4 SiO 2 and treating the aforesaid mixture with H 3 PO 4 in an amount corresponding to 40-52 P 2 O 5 , SiO 2 or MgO or a mixture thereof making up at least 1% by weight, homogenizing and drying the mixture and subjecting it to a step-by-step thermal treatment lasting 1-2 h at 350-450° C., 750-850° C. and 950-1,050° C. respectively, melting the mixture at between 1,550 and 1,650° C., holding it at the melting temperature for between 10 and 60 minutes and finally cooling the mixture in a spontaneous or temperature-controlled manner, grinding it, if necessary, and sintering it to obtain moulded bodies.