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Method for preparing 3D printing cobalt-based ceramic composite powder for dental department

A ceramic composite and 3D printing technology, applied in medical science, metal processing equipment, transportation and packaging, etc., can solve the problems of low interface bonding strength, reduced tensile properties, low density of ceramic components, etc., and achieve good interface wettability. , the effect of tensile strength improvement, low thermal expansion coefficient

Active Publication Date: 2017-11-03
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its disadvantages are: on the one hand, the sphericity of the material after ball milling is poor, and the powder cannot be evenly spread on the substrate during the powder spreading process of 3D printing; on the other hand, in the process of laser melting, the ceramic phase and metal The interfacial bonding strength between the substrates is low, the wettability is poor, and the density of the ceramic components is small, the surface tension forms a gradient during rapid cooling, and the melt convects. Under the action of capillary flow, the ceramic particles are pushed into the melt. The upper part of the pool, eventually causing the ceramic components to not be evenly distributed on the metal substrate
Therefore, the mechanical properties of denture inner crowns prepared by 3D printing of such composite materials are poor, especially the tensile properties will be greatly reduced

Method used

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  • Method for preparing 3D printing cobalt-based ceramic composite powder for dental department
  • Method for preparing 3D printing cobalt-based ceramic composite powder for dental department

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 25.4 g of aluminum isopropoxide (purity >98%) and add it to 500 mL of deionized water, then add 30.7 g of citric acid, heat up to 60 ° C and stir for 1 h, adjust the pH value of the system to 7 with nitric acid or ammonia water, and make the system Transparent without precipitation, then add 2 g of ethylene glycol, and ultrasonically vibrate for 1 hour to obtain aluminum sol.

[0029] Add 100 g of medical cobalt-chromium alloy powder with a particle size of 20-55 μm to the above-mentioned aluminum sol, and ultrasonically vibrate for 30 minutes at 70° C. to obtain a fully dispersed cobalt-chromium alloy gel.

[0030] The above gel was placed in a blast drying oven and dried at 150° C. for 10 h to obtain a fine-grained AlOOH-coated cobalt-chromium alloy precursor.

[0031] The obtained precursor was transferred to a muffle furnace at 450°C for calcination for 4 hours to obtain Al 2 o 3 Cobalt-based ceramic composite powder raw material coated with cobalt-chromium ...

Embodiment 2

[0036] Weigh 15.7 g of aluminum isopropoxide (purity >98%) and add it to 500 mL of deionized water, then add 21.3 g of citric acid, heat up to 80 ° C and stir for 1.2 h for hydrolysis reaction, and adjust the pH value of the system to 7 with nitric acid or ammonia water to make The system was transparent without precipitation, and then 2 g of ethylene glycol was added and ultrasonically oscillated for 1 hour to obtain an aluminum sol.

[0037] Add 100 g of medical cobalt-chromium alloy powder with a particle size of 20-55 μm to the above-mentioned aluminum sol, and ultrasonically vibrate for 30 minutes at 70° C. to obtain a fully dispersed cobalt-chromium alloy gel.

[0038] The above-mentioned gel was placed in a forced air drying oven, and dried at 80°C for 15 hours to obtain a fine-grained AlOOH-coated cobalt-chromium alloy precursor.

[0039] The obtained precursor was transferred to a muffle furnace at 460°C for calcination for 4 hours to obtain Al 2 o 3 Cobalt-based ce...

Embodiment 3

[0044] Weigh 11.3 g of aluminum isopropoxide (purity >98%) and add it to 500 mL of deionized water, then add 16.4 g of citric acid, heat up to 80 ° C and stir for 0.8 h for hydrolysis reaction, and adjust the pH value of the system to 7 with nitric acid or ammonia water to make The system was transparent without precipitation, and then 2 g of ethylene glycol was added and ultrasonically oscillated for 1 hour to obtain an aluminum sol.

[0045] Add 100 g of medical cobalt-chromium alloy powder with a particle size of 20-55 μm to the above-mentioned aluminum sol, and ultrasonically vibrate for 30 minutes at 80° C. to obtain a fully dispersed cobalt-chromium alloy gel.

[0046] The above gel was placed in a blast drying oven and dried at 80° C. for 13 hours to obtain a fine-grained AlOOH-coated cobalt-chromium alloy precursor.

[0047] The obtained precursor was transferred to a muffle furnace at 460°C for calcination for 4 hours to obtain Al 2 o 3 Cobalt-based ceramic composit...

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Abstract

The invention discloses a method for preparing 3D printing cobalt-based ceramic composite powder for a dental department. The method comprises the steps that medical cobalt-chromium alloy powder is added to aluminum sol according to the requirement that the mass ratio of Al2O3 to a medical cobalt-chromium alloy is (0.05-0.2): 1, and the mixture is dispersed uniformly, so that gel is obtained; then, the gel is dried, so that an AlOOH-clad cobalt-chromium alloy precursor is obtained; the precursor is calcinated at the temperature of 400-500 DEG C, so that a cobalt-based ceramic composite powder raw material of an Al2O3-clad cobalt-chromium alloy is obtained; and after ball milling and vacuum drying are conducted on the obtained cobalt-based ceramic composite powder raw material, screening is conducted, so that the cobalt-based ceramic composite powder with the particle diameter ranging from 20 microns to 55 microns is obtained. By means of the composite powder prepared through the method, in the 3D printing laser fusion process, a ceramic phase is high in bonding strength when being bonded with a metallic matrix interface and good in wettability; and a prepared 3D printing molding part is low in thermal expansion coefficient and good in tensile property.

Description

technical field [0001] The invention relates to a metal-matrix ceramic composite material, in particular to a method for preparing a metal-matrix ceramic composite powder for 3D printing. Background technique [0002] In recent years, 3D printing technology has been more and more widely used in the personalized customization of human implants, especially the manufacture of denture metal inner crowns. [0003] The mechanical properties of denture metal inner crowns manufactured by 3D printing technology are almost the same as those of metal inner crowns manufactured by traditional casting methods, and even better than cast metal inner crowns in terms of density and tensile strength. In addition, 3D printing technology has the advantages of high speed, material saving, and labor cost saving. It has a very broad application prospect in the manufacture of denture metal inner crowns. [0004] After the metal inner crown of the denture is fabricated, it needs to be fused with por...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B33Y70/00A61L27/10A61L27/50
CPCA61L27/105A61L27/50B33Y70/00A61L2430/12B22F1/16
Inventor 王建宏张浩高明香白培康赵占勇刘第强
Owner ZHONGBEI UNIV
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