Method for preparing cobalt-chromium alloy fixed denture and movable denture through vacuum hot pressing sintering
A technology of vacuum hot pressing sintering and cobalt chromium alloy, which is applied in the field of denture preparation, and can solve the problems of low production efficiency and high cost
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Embodiment 1
[0045] Take 5kg of CoCrW alloy powder, chemical composition: Co61.5%, Cr27.75%, W8.5%, Si1.5%, Fe0.5%, Mn0.25%, particle size range 10-150μm. Placed in a mold for vacuum hot pressing sintering, where the vacuum degree is 1×10 -2 Pa, the pressure is 35MPa, the temperature is 1320°C, the heating rate is 5°C / min, and the holding time is 30min. Sampling test after sintering shows that the density of the material is 98.8% (porosity is 1.2%), the bending strength is 1050.8MPa, and the elongation at fracture is 4.1%, which meets the performance requirements of fixed dentures.
[0046] Continue the second sintering, the temperature is 1150°C, the heating rate is 5°C / min, the holding time is 20min, and argon is filled for protection when the temperature is lowered. After the secondary sintering, the sampling test shows that the density of the material is 99.1% (porosity is 0.9%), the bending strength is 910.5MPa, and the elongation at fracture is 27%, which meets the performance requi...
Embodiment 2
[0048] Take 5kg of CoCrW alloy powder, chemical composition: Co61.5%, Cr27.75%, W8.5%, Si1.5%, Fe0.5%, Mn0.25%, particle size range 15-53μm. Placed in a mold for vacuum hot pressing sintering, where the vacuum degree is 1×10 -2 Pa, the pressure is 35MPa, the temperature is 1320°C, the heating rate is 10°C / min, and the holding time is 30min. Sampling test after sintering shows that the density of the material is 99.0% (porosity 1%), the bending strength is 1100MPa, and the elongation at fracture is 3.5%, meeting the performance requirements of fixed dentures.
[0049] Continue the second sintering, the temperature is 1150°C, the heating rate is 5°C / min, the holding time is 20min, and argon is filled for protection when the temperature is lowered. After the secondary sintering, the sampling test showed that the density of the material was 99.2% (porosity 0.8%), the bending strength was 1058MPa, and the elongation at fracture was 29%, which met the performance requirements of re...
Embodiment 3
[0051] Take 5 kg of CoCrMo alloy powder, chemical composition: Co64%, Cr25%, Mo5%, W5%, Si1%, particle size range 15-53 μm. Put it in the mold, carry out vacuum hot pressing sintering molding, the vacuum degree of one sintering is 5×10 -3 Pa, the pressure is 38MPa, the temperature is 1340°C, the heating rate is 5°C / min, and the holding time is 40min. Sampling test after sintering, material density is 99.2% (porosity 0.8%), bending strength 1031MPa, fracture elongation 3.6%, meet the performance requirements of fixed dentures.
[0052] Continue the second sintering, the temperature is 1190°C, the heating rate is 10°C / min, the holding time is 30min, and the argon is filled for protection when the temperature is lowered. After the secondary sintering, the sampling test shows that the material density is 99.3% (porosity is 0.7%), the bending strength is 975MPa, and the fracture elongation is 25%, which meets the performance requirements of removable dentures.
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