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

Pending Publication Date: 2022-04-01
NANTONG JINYUAN INTELLIGENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage is high co

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention provides a method for preparing a cobalt-chromium alloy fixed false tooth and a cobalt-chromium alloy movable false tooth through vacuum hot pressing sintering, and belongs to the technical field of false tooth preparation. According to the method, cobalt-chromium alloy micro powder is subjected to vacuum hot-pressing sintering forming, a cobalt-chromium alloy fixed false tooth is obtained, and the cobalt-chromium alloy movable false tooth is obtained by conducting normal-pressure sintering on an obtained vacuum hot-pressing sintering forming product. The method adopts a vacuum hot pressing sintering molding mode, has the advantages of simple preparation method, low cost and high production efficiency, and can realize batch production of the cobalt-chromium alloy false tooth. In the vacuum hot pressing sintering forming process, a cobalt-chromium alloy powder sintering neck grows up, holes are closed, a continuous base body is formed, under the grain boundary diffusion mechanism, the holes are shrunk and closed, and the compactness, strength and ductility of the material all meet the use requirements of fixed dentures. And through normal-pressure sintering, the compactness is further improved, the plasticity and toughness of the material are enhanced, the ductility is increased, and the use requirements of removable dentures are met.

Description

technical field [0001] The invention relates to the technical field of denture preparation, in particular to a method for preparing cobalt-chromium alloy fixed dentures and movable dentures by vacuum hot pressing and sintering. Background technique [0002] Dentures, or dentures that help people chew when their natural teeth are missing. Some people's teeth fall out for some reason and cannot grow new teeth, which makes it very inconvenient to eat. At this time, it is necessary to install dentures to help. Dentures on the market are mainly divided into two types: removable dentures and fixed dentures. Fixed dentures mainly use the natural teeth on the adjacent sides or one side of the missing tooth space as support, and fix the dentures to the natural teeth through the retainers on them. , generally cannot be removed. Cobalt-chrome fixed dentures are metal inner and porcelain outer, and the dentures are lifelike in color and look very similar to natural teeth. Fixed dentu...

Claims

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Application Information

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IPC IPC(8): B22F3/14C22C19/07B22F3/10
Inventor 姜勇胡玉梁廷禹顾建东
Owner NANTONG JINYUAN INTELLIGENT TECH CO LTD
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