Method for preparing ceramic particle enhanced metal matrix composite coating in laser cladding mode through asynchronous powder feeding method

A technology of metal-based composite and ceramic particles, which is applied in the coating process and coating of metal materials, can solve the problems that the coating thickness is difficult to control accurately, affects the performance of the coating, and the uneven distribution of ceramic particles melts and decomposes, so as to reduce the deviation Polymerization and uneven distribution, easy control of coating thickness and dilution rate, and simple process flow

Active Publication Date: 2015-10-28
西安合方长激光智能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The prefabricated coating method is simple in process, flexible in operation, and has no requirements on powder fluidity, but it is difficult to accurately control the coating thickness when preparing ceramic particle-reinforced metal matrix composite coatings, the dilution rate is large, there are many pores, and the cladding layer There are serious melting and decomposition of ceramic particles and uneven distribution, which directly affect the coating performance
Compared with the prefabricated coating method, the coaxial powder feeding method and the lateral powder feeding method have the advantages of simple process flow, controllable coating thickness and dilution rate, and easy automatic production. However, in the preparation process of ceramic particle reinforced metal matrix composite coating In addition, the phenomenon of ceramic particles burning, melting and decomposition, and uneven particle distribution still occur in the coating, and the interaction between the ceramic particles and the alloy powder in the powder feeding process affects the powder feeding efficiency, so that the coating hardness is lower than that prepared by the pre-coating method under the same conditions. The cladding layer is low, which greatly reduces the performance of the coating

Method used

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  • Method for preparing ceramic particle enhanced metal matrix composite coating in laser cladding mode through asynchronous powder feeding method
  • Method for preparing ceramic particle enhanced metal matrix composite coating in laser cladding mode through asynchronous powder feeding method
  • Method for preparing ceramic particle enhanced metal matrix composite coating in laser cladding mode through asynchronous powder feeding method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of WC ceramic particles reinforced Ni-based alloy composite coating by asynchronous powder feeding method:

[0033] (1) 304 stainless steel is selected as the substrate for laser cladding. The substrate size is 30mm×50mm×3mm. It is cleaned with acetone before use, and then sandblasted with 100-mesh brown corundum. The sandblasting angle is 90 degrees (vertical sandblasting ), after the sandblasting is completed, clean it with acetone and dry it for later use.

[0034] (2) Put Ni-based alloy powder and WC ceramic particles (polygonal) in a blast dryer for drying treatment at a temperature of 100° C. and turn on the fan for 120 minutes. The particle size of the Ni-based alloy powder is 70-80 μm, and the average particle size of the WC ceramic particles is 50 μm.

[0035] (3) Fix the side powder feeding nozzle on the coaxial powder feeding nozzle to assemble an asynchronous powder feeding nozzle, wherein the side powder feeding nozzle is fixed on the side opposi...

Embodiment 2

[0040] Preparation of Cr by Asynchronous Powder Feeding Method 3 C 2 Ceramic particle reinforced Ni-based alloy composite coating:

[0041] (1) 304 stainless steel is selected as the substrate for laser cladding. The substrate size is 30mm×50mm×3mm. It is cleaned with acetone before use, and then sandblasted with 100-mesh brown corundum. The sandblasting angle is 90 degrees (vertical sandblasting ), after the sandblasting is completed, clean it with acetone and dry it for later use.

[0042] (2) Ni-based alloy powder and Cr 3 C 2 The ceramic powder (polygon) is dried in a blast dryer at a temperature of 100° C. and the fan is turned on for 120 minutes. Among them, the particle size of Ni-based alloy powder is 70-80 μm, Cr 3 C 2 The average particle size of the ceramic powder is 50 μm.

[0043] (3) Fix the side powder feeding nozzle on the coaxial powder feeding nozzle to assemble an asynchronous powder feeding nozzle, wherein the side powder feeding nozzle is fixed on t...

Embodiment 3

[0048] Preparation of Al by Asynchronous Powder Feeding Method 2 o 3 -TiO 2 Composite coating:

[0049] (1) Use Ti-6Al-4V alloy (TC4) as the base material, the size of the base is 80mm×80mm×6mm, clean it with acetone before use, and then use 100 mesh brown corundum for sandblasting, the sandblasting angle is 90 degrees (Vertical sandblasting), after the sandblasting is completed, clean it with alcohol and dry it for later use.

[0050] (2) TiO 2 Powder and Al 2 o 3 The powder (nearly spherical) is dried in a blast dryer at a temperature of 120° C. and the fan is turned on for 480 minutes. where TiO 2 The particle size of the powder is 100μm, Al 2 o 3 The average particle size of the powder was 100 μm.

[0051] (3) Fix the side powder feeding nozzle on the coaxial powder feeding nozzle to assemble an asynchronous powder feeding nozzle, wherein the side powder feeding nozzle is fixed on the side opposite to the laser scanning direction (see figure 1 ).

[0052] (4) T...

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Abstract

The invention provides a method for preparing a ceramic particle enhanced metal matrix composite coating in a laser cladding mode through an asynchronous powder feeding method. A lateral powder feeding nozzle is fixed to one coaxial powder feeding nozzle and assembled into an asynchronous powder feeding nozzle; the lateral powder feeding nozzle is used for feeding ceramic particle enhancing phases into the portion between the middle portion and the tail portion of the side, opposite to the laser scanning direction, of a molten pool; the coaxial powder feeding nozzles are used for feeding alloy powder or metal ceramic composite powder to the center of the molten pool; a laser device is used for conducting laser cladding, and then the ceramic particle enhanced metal matrix composite coating is obtained. According to the method, the coaxial powder feeding method and the lateral powder feeding method are combined, the ceramic particle enhancing phases are fed into the low-temperature region at the rear portion of the molten pool, so that the phenomena of nonuniformity of melting decomposition, clustering and distribution of the ceramic particle enhancing phases are reduced, and the ceramic particle enhancing phases are evenly distributed in the whole coating by keeping the original appearance to the maximum extent; accordingly, the ceramic particle enhancing phases are effectively retained and evenly distributed, and the performance of the composite coating can be substantially improved.

Description

technical field [0001] The invention belongs to the field of laser processing, and relates to a new asynchronous powder feeding method for laser cladding, in particular to the asynchronous powder feeding method for preparing ceramic particle-reinforced metal-based composite coatings. Background technique [0002] At present, the powder feeding methods of laser cladding are mainly divided into prefabricated coating method, coaxial powder feeding method and lateral powder feeding method. The prefabricated coating method is simple in process, flexible in operation, and has no requirements on powder fluidity, but it is difficult to accurately control the coating thickness when preparing ceramic particle-reinforced metal matrix composite coatings, the dilution rate is large, there are many pores, and the cladding layer There are serious melting and decomposition of ceramic particles and uneven distribution, which directly affect the performance of the coating. Compared with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
Inventor 王豫跃董海洋杨冠军李长久龚永锋赖亚楠姚国华
Owner 西安合方长激光智能科技有限公司
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