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3D printed cobalt-chromium alloy for dental porcelain repair and preparation method thereof

A 3D printing, cobalt-chromium alloy technology, applied in the direction of dentures, additive processing, etc., can solve the problems of low elongation, high strength and hardness, and poor mechanical properties of restorations, which is beneficial to metal-ceramic bonding and low cost. Low, reduce the effect of surface activity

Active Publication Date: 2021-01-01
CHENGDU KENINGDA MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing 3D printed cobalt-chromium alloy porcelain restorations have the following problems in clinical application: (1) problems such as porcelain chipping and porcelain peeling; (2) the restorations after annealing generally have low elongation, strength and hardness Excessive problem, that is, the 3D printed cobalt-chromium alloy used in the prior art for dental porcelain restoration has poor bonding performance and poor mechanical properties

Method used

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  • 3D printed cobalt-chromium alloy for dental porcelain repair and preparation method thereof
  • 3D printed cobalt-chromium alloy for dental porcelain repair and preparation method thereof
  • 3D printed cobalt-chromium alloy for dental porcelain repair and preparation method thereof

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preparation example Construction

[0036] The invention provides a method for preparing a 3D printed cobalt-chromium alloy for dental porcelain restoration, comprising the following steps:

[0037] A 3D printing method is used to make a cobalt-chromium porcelain restoration on the substrate, and the cobalt-chromium porcelain restoration includes the following chemical composition in weight percentage: Cr 30-35%, W 4-9%, Mo 4-9%, Si 0.5-2.0%, Ta 5-10%, Nb 0.5-2.0%, the balance of Co and unavoidable impurities, the mass content of the impurities is less than 0.5%;

[0038] The cobalt-chromium porcelain restoration and the substrate are sequentially subjected to vacuum stress-relief annealing and support removal to obtain a cobalt-chromium alloy after stress-relief annealing;

[0039] In a protective atmosphere, the cobalt-chromium alloy after the stress relief annealing is sequentially subjected to solution treatment and aging treatment to obtain the 3D printed cobalt-chromium alloy for dental porcelain restorati...

Embodiment 1

[0062] In this example, the chemical composition of a 3D printed cobalt-chromium alloy for dental porcelain restoration and the weight percentages of each element are: Cr 30.0%, W 5.0%, Mo 5.0%, Si 1.0%, Ta 8.0%, Nb 1.5% , the balance is Co and impurities, and the weight percentage of impurities is less than 0.5%. Carry out heat treatment to cobalt-chromium alloy, specifically comprise the following steps:

[0063] (1) Use laser selective melting (SLM) technology to make cobalt-chromium ceramic alloys with the above chemical composition, then put the formed cobalt-chromium alloy together with the substrate into a vacuum furnace, and first raise the temperature to 600 at a rate of 20°C / min. ℃, keep warm for 45min; then rise to 1100℃ at a rate of 30℃ / min, keep warm for 60min; then cool to room temperature at a rate of 15℃ / min.

[0064] (2) Cutting the cobalt-chromium ceramic alloy annealed in step (1) from the substrate, and removing the support.

[0065] (3) Put the cobalt-ch...

Embodiment 2

[0069] In this example, the chemical composition of a 3D printed cobalt-chromium alloy for dental porcelain restoration and the weight percentages of each element are: Cr 32.0%, W 6.0%, Mo 7.0%, Si 1.5%, Ta 5.0%, Nb 0.5% , the balance is Co and impurities, and the weight percentage of impurities is less than 0.5%. Carry out heat treatment to cobalt-chromium alloy, specifically comprise the following steps:

[0070] (1) Use laser selective melting (SLM) technology to make cobalt-chromium ceramic alloys with the above chemical composition, then put the formed cobalt-chromium alloy together with the substrate into a vacuum furnace, and first raise the temperature to 550 at a rate of 25°C / min. ℃, keep warm for 50min; then raise the temperature to 1150℃ at a rate of 25℃ / min, keep warm for 70min; then cool to room temperature at a rate of 5℃ / min.

[0071] (2) Cutting the cobalt-chromium ceramic alloy annealed in step (1) from the substrate, and removing the support.

[0072] (3) P...

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Abstract

The invention provides a 3D printed cobalt-chromium alloy for dental porcelain repair and a preparation method thereof, and belongs to the field of dental porcelain repair. A Ta element is added, so that the thermal expansion coefficient is reduced, the metal ceramic bonding strength is improved, the surface active energy is reduced, solid solution strengthening is caused, and the strength is improved; the content of a Cr element is increased, the content of a Co element is reduced, the content of a hcp phase is increased, metal and ceramic bonding is facilitated, after the content of the Co element is reduced, combination of Cr-W, Cr-Mo, Cr-Si and W-Mo is improved, and the strength of the alloy is improved; vacuum stress relief annealing is adopted, and residual stress is completely eliminated, so that microstructure phase change caused by the residual stress in the service process of a cobalt-chromium restoration is avoided, and micro-cracks are prevented from being formed on a metal-ceramic bonding interface; and solid solution and aging are adopted, the composition of a cobalt-chromium alloy phase and precipitation of a second phase are adjusted, so that the alloy has good mechanical properties, meanwhile, the hcp phase is further improved, and the metal-ceramic bonding strength is improved.

Description

technical field [0001] The invention relates to the technical field of dental porcelain restoration, in particular to a 3D printed cobalt-chromium alloy for dental porcelain restoration and a preparation method thereof. Background technique [0002] 3D printing is a technology based on digital model files, using bondable materials such as powdered metal or plastic, to construct objects by layer-by-layer printing. It has rapid prototyping, short processing cycle, easy processing of personalized objects and Due to the characteristics of complex shape objects, it is especially suitable for the production of dental crowns and bridges in the field of dental porcelain restoration. In order to ensure the quality of 3D printing, 3D printing powder materials require: high purity, low oxygen content, good fluidity; high particle shape sphericity, fine particle size, and narrow distribution. For dental 3D printing alloy powder, it should also have good metal-ceramic bonding force, cor...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C19/07B22F3/105B22F5/00B22F3/24B33Y10/00B33Y70/00B33Y40/20A61C13/083C22F1/02C22F1/10C22F1/08
CPCA61C13/083B22F3/24B22F5/00B22F2003/248B33Y10/00B33Y70/00B33Y40/20C22C1/0433C22C19/07C22F1/02C22F1/08C22F1/10
Inventor 李宁颜家振周亚男欧阳红川李锐张幖张玉鲜刘楠樊星云
Owner CHENGDU KENINGDA MATERIALS
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