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Cobalt-chromium alloy powder and preparation method and application thereof

A cobalt-chromium alloy and powder technology, which is applied in the field of cobalt-chromium alloy powder and its preparation, can solve the problems of powder particle size range, bulk density physical and chemical parameters matching, affecting performance, high oxygen content and nitrogen content of cobalt-chromium powder, etc. Achieve the effects of enhancing biocompatibility, ensuring performance, and reducing alloy density

Active Publication Date: 2017-02-08
OPTIMAL MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cobalt-chromium alloy powders currently used in dental additive manufacturing have the following problems: 1. Most of the cobalt-chromium alloy powders are processed by gas atomization, and the produced powders have poor sphericity, many satellite particles, and poor fluidity. Directly affects the processing quality of additive manufacturing
Moreover, the cobalt chromium powder prepared by gas atomization has high oxygen and nitrogen content, and there are hollow balls in the powder, resulting in pores inside the final molded part, which affects the performance
2. In order to ensure the subsequent mechanical properties, the current cobalt-chromium alloy powder will add elements such as beryllium, cadmium and nickel. The existence of these elements will affect the biocompatibility of cobalt-chromium alloy
After the prosthesis is installed in the patient's mouth, it will affect the patient's health due to the precipitation of harmful metal ions
3. The current cobalt-chromium powders are basically produced for industrial manufacturing, so the physical and chemical parameters such as the particle size range and bulk density of the powder cannot be well matched with the requirements of additive manufacturing

Method used

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  • Cobalt-chromium alloy powder and preparation method and application thereof
  • Cobalt-chromium alloy powder and preparation method and application thereof
  • Cobalt-chromium alloy powder and preparation method and application thereof

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preparation example Construction

[0038] The preparation method of cobalt-chromium alloy powder of the present invention comprises the steps:

[0039] a. Melting and atomization: In the powder-making chamber in an inert gas atmosphere, a plasma torch is used to melt and atomize the cobalt-chromium alloy wire to form high-temperature small droplets;

[0040] b. Cooling: Pass an inert gas flow with a temperature of 300-500°C into the powder-making chamber, and laminarly cool the high-temperature small droplets to obtain cobalt-chromium alloy powder;

[0041] Wherein, the inert gas in step a and the inert gas flow in step b are both argon or helium.

[0042] Wherein, the diameter of the cobalt-chromium alloy wire is preferably 3-20 mm.

[0043]The method of the invention can adopt industrialized cobalt-chromium alloy wire as raw material. However, in order to obtain a cobalt-chromium alloy composition that is more suitable for dental restorations, the cobalt-chromium alloy wire of the present invention is prefe...

Embodiment 1

[0063] a. Raw material preparation stage

[0064] The high-purity elemental alloy powder is uniformly mixed according to the composition requirements, and then pressed into a pre-alloyed block by hot isostatic pressing. Wherein the conditions of hot isostatic pressing are 1050° C., 140 Mpa, and heat preservation for 160 minutes.

[0065] The dental cobalt chromium alloy is proportioned according to the following chemical composition:

[0066] Cr: 24.5%, Mo: 7.5%, Cu: 3.5%, Mn: 1.5%, and the balance is Co.

[0067] Next, a sliding wire drawing machine was used to process the cobalt-chromium alloy block into a uniform wire with a diameter of 10 mm.

[0068] b. Plasma melting and atomization stage

[0069] During the powder making process, the wire material flows into the powder making chamber at a uniform speed, and after reaching the plasma torch processing melting zone with argon as the working gas, the metal wire is instantly melted by the plasma, and then atomized into a ...

Embodiment 2

[0080] According to the method of embodiment 1, only change the composition of cobalt-chromium alloy, carry out proportioning according to following chemical composition:

[0081] Cr: 24%, Mo: 6%, Cu: 4%, Mn: 2%, and the balance is Co.

[0082] The chemical composition of the prepared cobalt-chromium alloy powder is shown in Table 1, and the bulk density and fluidity data are shown in Table 2.

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Abstract

The invention relates to cobalt-chromium alloy powder and a preparation method and application thereof, and belongs to the technical field of material increase manufacturing in the department of dentistry. The cobalt-chromium alloy powder special for material increase manufacturing in the department of dentistry is provided. The cobalt-chromium alloy powder comprises, by weight, 24%-27% of Cr, 6%-9% of Mo, 2%-4% of Cu, 1%-2% of Mn, 0-0.05% of O, 0-0.02% of N and the balance Co. According to the cobalt-chromium alloy powder, the specific ingredients and matching are adopted, so that the alloy density is decreased, and the low-weight purpose of final products is realized; the toxicity caused by beryllium, cadmium and nickel in final cobalt-chromium alloy in the department of dentistry is completely removed while the usability is guaranteed, and biocompatibility of the cobalt-chromium alloy is greatly enhanced; and moreover, the powder prepared through the preparation method has the advantages of being good in degree of sphericity, small in number of hollow sphere particles, good in mobility and the like, thereby being capable of completely meeting the requirement for the powder by metal material increase manufacturing.

Description

technical field [0001] The invention relates to cobalt-chromium alloy powder and a preparation method and application thereof, belonging to the technical field of dental additive manufacturing. Background technique [0002] The prevalence rate of dentistry is very high all over the world, and there are as many as 800 million dental patients in China alone. Among them, tooth defects and missing dentition are the most common dental diseases, which are usually repaired with dentures. Nickel-chromium alloy is the most common alloy material in the traditional dental casting process, but because nickel-chromium alloy contains nickel, it is easy to cause allergic reactions, so this alloy material has been gradually eliminated. Cobalt-chromium alloy has become the most commonly used dental alloy material because of its good mechanical properties, biocompatibility and corrosion resistance. It is widely used in the manufacture of dental restorations such as metal-ceramic crowns and b...

Claims

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Application Information

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IPC IPC(8): C22C19/07B22F9/14B33Y70/00B22F3/105A61K6/04
CPCC22C19/07B22F3/105B22F9/14B33Y70/00B22F2999/00A61K6/84B22F10/00B22F10/34B22F10/25B22F10/28B22F2201/11Y02P10/25B22F10/20
Inventor 刘睿诚吴利苹蒋安琪曾益伟王强陈玲莉陈军
Owner OPTIMAL MATERIAL TECH CO LTD
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