The invention relates to oral medical materials, in particular to a
cobalt-
chromium ceramic-
metal alloy disc for
engraving fixed
dentures. The
cobalt-
chromium ceramic-
metal alloy disc is prepared fromthe following raw materials in percentage by weight: 50%-65% of
cobalt, 20%-35% of
chromium, 3%-6% of
molybdenum, 1%-3% of
titanium, 5%-7% of
tungsten, 0.08%-0.3% of
lanthanum, 0.1%-0.5% of
cerium, 0.09%-0.3% of
yttrium and 0.06%-0.2% of
strontium. The preparation method comprises the following steps that 1, after the
tungsten is firstly melt in a high-frequency high-temperature furnace, the cobalt, the chromium and the
molybdenum are added in sequence; 2, the metals are introduced into a vacuum
smelting furnace after melting, and then the
cerium, the
lanthanum, the
titanium, the
yttrium andthe
strontium are added for vacuum melting; 3, a smelted and
molten metal solution is introduced into a rectangular parallelepiped mold, and is cooled after being formed in a vacuum; and 4, for a cooled
alloy metal ingot, residues in an alloy are
cut off and separated from the alloy by a material reducing method, the remaining materials are machined by
wire cutting and lathe turning, and the cobalt-chromium
ceramic-
metal alloy disc with the
diameter being 98mm and the thickness being 10mm-25mm is machined. Compared with existing products, the cobalt-chromium ceramic-
metal alloy disc is high inengraving
machining yield and stable in quality, and is suitable for promotion and use.