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Preparation method for cobalt-based composite ceramic powder for dentistry 3D printing

A 3D printing, ceramic powder technology, applied in 3D printing, dentistry, additive manufacturing, etc., can solve the problems of poor mechanical properties of denture inner crowns, low interface bonding strength, and reduced tensile properties, and achieve high interface bonding strength. Good wettability and improved tensile strength

Inactive Publication Date: 2017-10-17
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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  • Preparation method for cobalt-based composite ceramic powder for dentistry 3D printing
  • Preparation method for cobalt-based composite ceramic powder for dentistry 3D printing

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Take 500g of medical cobalt-chromium alloy powder with an average particle size of 30-50µm prepared by the aerosol method, and Al with an average particle size of 60-100nm 2 o 3 Put 30g of powder into a star-type ball mill, add stainless steel balls with a diameter of 10mm according to the ball-to-material ratio of 8:1, and ball mill at a speed of 200r / min for 10h in a vacuum state to obtain cobalt-based ceramic composite powder raw materials.

[0026] Set the power of the RF plasma generator to 60KW, the frequency to 3.5MHz, the central gas flow of the argon plasma torch to 1.3L / min, and the side gas flow to 85L / min to establish a stable argon plasma torch. Spray the cobalt-based ceramic composite powder raw material with a flow rate of 1.2L / min into the argon plasma torch at a feeding rate of 4g / min for high-temperature melting, and quickly enter the heat exchange chamber to cool and solidify, then collect and obtain spheroidized cobalt-based ceramics Composite powde...

Embodiment 2

[0029] Take 500g of medical cobalt-chromium alloy powder with an average particle size of 30-50µm and 42g of SiC powder with an average particle size of 80-120nm prepared by the aerosol method, put them into a star-type ball mill, and add stainless steel with a diameter of 10mm according to the ball-to-material ratio of 8:1. Balls were ball milled at a speed of 220r / min for 12 hours in a vacuum state to obtain cobalt-based ceramic composite powder raw materials.

[0030] Set the power of the RF plasma generator to 60KW, the frequency to 3.5MHz, the central gas flow of the argon plasma torch to 1.4L / min, and the side gas flow to 90L / min to establish a stable argon plasma torch. Spray the cobalt-based ceramic composite powder raw material with a flow rate of 1.5L / min into the argon plasma torch at a feeding rate of 3.8g / min for high-temperature melting, and quickly enter the heat exchange chamber to cool and solidify, then collect and obtain spherical cobalt-based ceramics. Cera...

Embodiment 3

[0033] Take 500g of medical cobalt-chromium alloy powder with an average particle size of 30-55µm prepared by the aerosol method, and ZrO powder with an average particle size of 80-120nm 2 Put 35g of powder into a star-type ball mill, add stainless steel balls with a diameter of 10mm according to the ball-to-material ratio of 8:1, and ball mill at a speed of 250r / min for 15h in a vacuum state to obtain cobalt-based ceramic composite powder raw materials.

[0034]Set the power of the RF plasma generator to 60KW, the frequency to 3.8MHz, the central gas flow of the argon plasma torch to 1.5L / min, and the side gas flow to 95L / min to establish a stable argon plasma torch. Spray the cobalt-based ceramic composite powder raw material with a flow rate of 1.4L / min into the argon plasma torch at a feeding rate of 3.5g / min for high-temperature melting, and quickly enter the heat exchange chamber to cool and solidify, then collect and obtain spherical cobalt-based ceramics. Ceramic compo...

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Abstract

The invention discloses a preparation method for cobalt-based composite ceramic powder for dentistry 3D printing. Medical cobalt-chromium alloy powder is mixed with ceramic powder with the mass ratio of the cobalt-chromium alloy powder to the ceramic powder being 100:(0.5-10), and the cobalt-chromium alloy powder and the ceramic powder are subjected to ball milling in a ball mill, then sprayed into an argon plasma torch through carrier gas and subjected to radio frequency plasma spheroidization through argon plasmas generated by a radio frequency plasma generator with the power being 55-65 KW and the frequency being 3-4 MHz to obtain the spheroidized cobalt-based ceramic composite powder. In the laser melting process of the cobalt-based composite ceramic powder prepared by the method, the interface bonding strength of a ceramic phase and a metal matrix is high, wettability is good, and a prepared 3D printing formed part is low in thermal expansion coefficient and good in tensile property.

Description

technical field [0001] The invention relates to a metal-based ceramic composite material, in particular to a method for preparing a metal-based ceramic composite powder for 3D printing. Background technique [0002] The alloy materials used to manufacture denture inner crowns mainly include titanium alloy, cobalt-chromium alloy and stainless steel. 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 manufa...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F9/14B33Y70/00A61C13/083
CPCA61C13/0019A61C13/083B22F9/04B22F9/14B33Y70/00B22F2009/043B22F2998/10A61C2201/00B22F1/065
Inventor 王建宏张浩任杰白培康洪琴
Owner ZHONGBEI UNIV
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