In-situ synthesis oxide dispersion strengthening CoCrW alloy and preparation method thereof

A technology of dispersion strengthening and in-situ synthesis, which is applied in additive manufacturing, dentures, additive processing, etc., can solve the problems of waste of cutting materials, wear of jaws and teeth, and collapse of porcelain, so as to prolong service life, improve bonding ability, and avoid The effect of the crack

Active Publication Date: 2021-02-05
GUANGDONG INST OF NEW MATERIALS
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  • Claims
  • Application Information

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Problems solved by technology

The two technologies have their own advantages and disadvantages: part of the process of investment casting technology needs to be completed manually, with low efficiency and unstable quality; waste of cutting materials and limited processing of complex shapes
However, the physical properties such as thermal expansion coefficient and elastic modulus of metal and ceramics are quite different. Cracks will appear at the gold-ceramic bonding interface after long-term use, resulting in the phenomenon of "ceramic collapse" and even the wear of the jaw teeth.

Method used

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  • In-situ synthesis oxide dispersion strengthening CoCrW alloy and preparation method thereof
  • In-situ synthesis oxide dispersion strengthening CoCrW alloy and preparation method thereof
  • In-situ synthesis oxide dispersion strengthening CoCrW alloy and preparation method thereof

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preparation example Construction

[0027] A preparation method for in-situ synthesis of oxide dispersion strengthened CoCrW alloy, said preparation method comprising the following steps:

[0028] (1) CoCrW alloy powder is subjected to laser melting treatment in an inert gas atmosphere to obtain an in-situ synthesized oxide dispersion strengthened CoCrW alloy, the oxygen content in the inert gas atmosphere is 200-2000ppm, and the CoCrW alloy powder contains Si element , the weight content of the Si element in the CoCrW alloy powder is 0.1%-2%.

Embodiment 1

[0030] As a method for preparing an in-situ synthesized oxide dispersion-strengthened CoCrW alloy according to an embodiment of the present invention, the preparation method includes the following steps:

[0031] The CoCrW alloy powder with a particle size of 1-53 μm is screened, and the CoCrW alloy powder is subjected to laser melting treatment on a selective laser melting 3D printing device in an inert gas atmosphere to obtain an in-situ synthesized oxide dispersion strengthened CoCrW alloy. The oxygen content is 1800ppm, the CoCrW alloy powder contains Si element, and the weight content of Si element in the CoCrW alloy powder is 1.0%;

[0032] The laser melting treatment of the selected laser melting 3D printing equipment includes the following parameters: the printing substrate is preheated to 80°C, the laser spot size is 0.1mm during the printing process, the laser power is 200-325W, the laser scanning rate is 700-1120mm / s, the laser The scanning distance is 0.08-0.1mm, t...

Embodiment 2

[0035] As a method for preparing an in-situ synthesized oxide dispersion-strengthened CoCrW alloy according to an embodiment of the present invention, the only difference between this embodiment and Embodiment 1 is that the oxygen content in the gas atmosphere is 1500 ppm, and the CoCrW alloy powder The weight content of Si element is 1.5%.

[0036] The composition content of the in-situ synthesized oxide dispersion strengthened CoCrW alloy prepared in this example is shown in Table 1.

[0037] Table 1 Composition content (%) of oxide dispersion strengthened CoCrW alloy

[0038]

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Abstract

The invention provides a preparation method of an in-situ synthesis oxide dispersion strengthening CoCrW alloy. The preparation method comprises the following steps that CoCrW alloy powder is subjected to laser melting treatment in an inert gas atmosphere to obtain the in-situ synthesis oxide dispersion strengthening CoCrW alloy, wherein the oxygen content in the gas atmosphere is 200 ppm to 2, 000ppm, the CoCrW alloy powder contains Si element, and the weight content of the Si element in the CoCrW alloy powder ranges from 0.1% to 2%. According to the preparation method, because a spherical / nearly spherical nanometer oxide dispersion precipitation phase is synthesized in situ in the CoCrW alloy through a selective laser melting technology, and the phase is in an amorphous state, no latticematching problem exists between the phase and an interface of a CoCrW alloy matrix, and an interface transition layer is tightly combined. According to the in-situ synthesis oxide dispersion strengthening CoCrW alloy, a large number of oxide dispersion precipitation phases are uniformly distributed inside, the bonding capacity of the CoCrW alloy and ceramic is remarkably improved due to existenceof the oxide dispersion precipitation phases, the phenomena of cracks and ceramic collapse are avoided, and the service life of porcelain teeth is prolonged.

Description

technical field [0001] The invention relates to the technical field of laser additive manufacturing, in particular to an in-situ synthesized oxide dispersion strengthened CoCrW alloy and a preparation method thereof. Background technique [0002] Co-Cr alloys have excellent mechanical properties, corrosion resistance, wear resistance, and biocompatibility, and are widely used in the field of medical devices, especially dental restorations. Traditional CoCr alloy dental restoration production technology is mainly investment casting technology and machining technology. The two technologies have their own advantages and disadvantages: part of the process of investment casting technology needs to be completed manually, with low efficiency and unstable quality; waste of cutting materials and limited processing of complex shapes. With the development of 3D printing technology, laser selective melting technology is gradually applied to the production of dental restorations, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10B22F10/28C22C19/07C22C32/00B22F5/00A61C13/083B33Y10/00B33Y80/00
CPCC22C1/05C22C19/07C22C32/001B22F5/00A61C13/083B33Y10/00B33Y80/00
Inventor 李克峰毛新华施麒刘辛
Owner GUANGDONG INST OF NEW MATERIALS
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