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Method for preparing metal-based gradient coating with enhanced laser-cladding ceramic nano-particles

A technology of nano-ceramic particles and laser cladding, which is applied in the coating process of metal materials, metal layered products, coatings, etc., to achieve the effect of solving high brittleness, easy agglomeration, and excellent toughness

Inactive Publication Date: 2013-06-19
TONGLING UNIV
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to invent a laser that can be used in harsh and extreme environments in view of the increasingly high requirements on the surface properties of materials at the present stage Method for preparing metal-based gradient coating reinforced by nano-ceramic particles by cladding

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  • Method for preparing metal-based gradient coating with enhanced laser-cladding ceramic nano-particles

Examples

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preparation example Construction

[0034] see figure 1 A method for preparing a metal-based gradient coating reinforced by laser cladding nano-ceramic particles of the present invention comprises the following steps:

[0035] First of all, several groups of mixed powders of micron metal powder 1 and nano-ceramic particles 2 with a certain ratio are prepared by mechanical composite method (high-energy ball milling) into corresponding coated composite powders 3 with evenly dispersed nanoparticles. In the mixed powder of the proportioned micron metal powder 1 and nano-ceramic particles 2, the content of nano-ceramic particles 2 gradually increases;

[0036] Secondly, the laser cladding sheet 4 is pressed by the molding method, that is, the prepared coated composite powder 3 is pressed into a cladding sheet 4 of a certain thickness in a mold by using a press or a tablet machine, so as to realize the green pre-treatment of the cladding layer. set;

[0037] Finally, the method of multi-layer laser cladding is used ...

Embodiment 1

[0039] Laser multi-layer cladding nano-Al on the surface of TiAl-based intermetallic compound alloy (TiAl alloy for short) substrate surface 2 o 3 MCrAlY-based gradient high-temperature oxidation-resistant coating reinforced by ceramic particles, M=Ni and Co, the specific steps are:

[0040] ①By controlling the mass ratio of balls to powder, the speed of the ball mill and the milling time, the nano-Al 2 o 3 Ceramic particles (average particle size 20nm) and MCrAlY alloy powder (Beijing General Research Institute of Mining and Metallurgy Metal Materials Institute, brand KF-113A, size distribution range 45~105μm) are mechanically composited into nano-Al on a high-energy ball mill. 2 o 3 Coated composite particles with evenly dispersed ceramic particles and coated around the micron MCrAlY powder;

[0041] ②According to the characteristics of small composite powder particles and large powder surface area, use the electrostatic force generated by friction during the molding pro...

Embodiment 2

[0044] Laser multi-layer cladding nano-Cr on the surface of TiAl alloy substrate 2 C 3 The NiCr-based gradient high-temperature wear-resistant coating reinforced by ceramic particles, its specific steps are similar to those of Example 1:

[0045] ① The mass ratio of 1:10, 1:5, 1:2 nano-Cr 2 C 3 Ceramic particles (average particle size 30nm) and NiCr alloy powder (Metal Materials Institute of Beijing General Research Institute of Mining and Metallurgy, brand KF-305, size distribution range 45~105μm) are mechanically compounded on a high-energy ball mill to form nano-Cr 2 C 3 Coated composite particles with evenly dispersed ceramic particles and coated around micron NiCr powder;

[0046] ②The micro-nano composite particles with different proportions are respectively pressed into a laser cladding sheet (size 25mm×8mm, thickness about 0.2mm) that is firmly bonded together by the molding method on the press;

[0047] ③Before laser cladding, roughen and clean the surface of the...

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Abstract

A method for preparing a metal-based gradient coating with enhanced laser-cladding ceramic nano-particles includes the steps that a plurality of groups of mixed powder of micron metal powder and ceramic nano-particles in a certain proportion are prepared into coated composite powder with uniformly dispersed nano-particles by means of mechanical composite, wherein the content of the ceramic nano-particles in the groups of mixed powder of the micron metal powder and the ceramic nano-particles in a certain proportion is gradually increased; laser-cladding sheets are pressed by means of compression molding; and the metal-based gradient coating with the nano-particles gradually is increased along the thickness direction by means of multilayer laser-cladding. The method has the advantages that the nano-particles can have excellent toughness by the aid of a dispersion strengthening mechanism for the nano-particles, the problem of easiness in cracking of a clad layer can be hopefully solved by the aid of a stress relieving mechanism for the gradient coating, excellent performances can be achieved by the aid of reinforcement of the nano-particles and the gradient coating, and accordingly the metal-based gradient coating can be applied to the surfaces of key parts such as aviation turbine engine blades and the like.

Description

Technical field: [0001] The invention relates to a method for obtaining a surface coating by laser cladding on a composite powder, in particular to a method for preparing a metal-based gradient coating reinforced by laser cladding nano ceramic particles. Background technique: [0002] Academicians Shi Changxu and Xu Binshi concluded that "the 20th century is the century of the formation, rise and rapid development of surface engineering, and the 21st century will be the century when surface engineering is more mature and perfect." track. As the frontier of interdisciplinary research in machinery, materials, physical chemistry and other disciplines, surface engineering is one of the key technologies for industrial development in the 21st century and an important part of advanced manufacturing technology, playing a very important role and status. Coating preparation technology is the main research content in the field of surface engineering. Research on the combination of new...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/02C23C24/10B32B15/01B32B37/24
Inventor 王东生周杏花
Owner TONGLING UNIV
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