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Method for preparing composite coating Ni3Al/Cr3C2 by use of laser cladding technique

A technology of laser cladding and composite coating, which is applied in the direction of coating and metal material coating technology, can solve the problems of large thermal stress, easy falling off, falling off, etc., and achieve compact structure, high bonding strength and wear resistance good effect

Inactive Publication Date: 2015-04-22
CHINA IRON & STEEL RES INST GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Electroplating chrome plating has fewer impurities, fine and dense structure, and a hardness of 700-1000HV. However, the chrome plating process is more polluting to the environment, and the thickness of the chrome plating layer is generally several microns, which is easy to fall off, so it cannot meet the long-term operation requirements of diesel engines.
Thermal spraying technology is flexible and has a wide range of applications. Coatings with different matching and different properties can be obtained through coating design. It is one of the commonly used coating processes for heavy-duty diesel engines. However, the relationship between the thermal spraying coating and the substrate is mainly mechanical. In combination, under the condition of high temperature and heavy load alternating load, it is easy to fall off, and the general coating uniformity, porosity and internal stress have also become the key issues restricting the performance of thermal spray coatings.
The surfacing technology has a lower cost, the metallurgical combination of the coating and the substrate, and the development of the surfacing material is relatively complete, but the surfacing produces a large thermal stress on the substrate, and there are certain limitations in the processing of some precision parts

Method used

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  • Method for preparing composite coating Ni3Al/Cr3C2 by use of laser cladding technique
  • Method for preparing composite coating Ni3Al/Cr3C2 by use of laser cladding technique
  • Method for preparing composite coating Ni3Al/Cr3C2 by use of laser cladding technique

Examples

Experimental program
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Effect test

example 1

[0037] Of 45 # The surface of the steel is pretreated to remove oil and impurities attached to the surface. Ni with a particle size range of 50μm~120μm 3 Cr with a particle size range of 50μm~120μm is added to Al powder 3 C 2 Powder to form Ni 3 Al powder and Cr 3 C 2 Cr in powder mixture 3 C 2 The content of powder is 20wt%, of which Ni 3 The chemical composition of the Al powder is: 9.5% by weight of Al, 12.5% ​​by weight of Fe, 0.8% by weight of Mn, 0.55% by weight of Ti, 0.2% by weight of B, the balance being Ni and unavoidable impurities. Then put Ni 3 Al / Cr 3 C 2 The mixture is mixed mechanically. Adopt coaxial powder feeding method to mix evenly Ni with a powder feeding amount of 15g / min 3 Al / Cr 3 C 2 Powder coated on 45 # The surface of steel, while using CO 2 The laser is used for laser cladding, where the laser cladding power is 1500W, the scanning speed is 0.48m / min, the laser circular spot diameter is 3mm, the laser cladding protective gas is argon, and the argon flo...

example 2

[0040] The surface of compacted graphite cast iron is pretreated to remove oil and impurities attached to its surface. Ni with a particle size range of 75μm~120μm 3 Add Cr with a particle size range of 75μm~120μm to Al powder 3 C 2 Powder to form Ni 3 Al powder and Cr 3 C 2 Cr in powder mixture 3 C 2 The content of powder is 35wt%, of which Ni 3 The chemical composition of the Al powder is: 8.0wt% Al, 9.5wt% Fe, 0.45wt% Mn, 0.5wt% Ti, 0.3wt% B, the balance being Ni and unavoidable impurities. Then put Ni 3 Al / Cr 3 C 2 The mixture is mixed mechanically. Adopt the side-axis powder feeding method to mix evenly Ni with a powder feeding amount of 25g / min 3 Al / Cr 3 C 2 The powder is sent to the surface of the vermicular graphite cast iron, and the fiber laser is used for laser cladding. The laser cladding power is 2100W, the scanning speed is 0.3m / min, the laser rectangular spot size is 5mm×5mm, and the laser cladding protective gas is argon. The gas flow rate of argon is 25L / min.

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example 3

[0043] The surface of heat-resistant stainless steel is pretreated to remove oil and impurities attached to the surface. Ni with a particle size range of 75μm~150μm 3 Add Cr with a particle size range of 75μm~150μm to Al powder 3 C 2 Powder to form Ni 3 Al alloy powder and Cr 3 C 2 Cr in powder mixture 3 C 2 The content of powder is 30wt%, among which Ni 3 The chemical composition of the Al powder is: 10.5% by weight of Al, 10.0% by weight of Fe, 0.6% by weight of Mn, 0.6% by weight of Ti, 0.2% by weight of B, the balance being Ni and unavoidable impurities. Then put Ni 3 Al / Cr 3 C 2 The mixture is mixed mechanically. Using the preset powder method, the uniformly mixed Ni 3 Al / Cr 3 C 2 The powder is pre-placed on the surface of heat-resistant stainless steel, and a semiconductor laser is used for laser cladding. The laser cladding power is 2400W, the scanning speed is 0.24m / min, the laser rectangular spot size is 2.5mm×10mm, and the laser cladding protective gas It is argon, an...

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Abstract

The invention discloses a method for preparing a composite coating Ni3Al / Cr3C2 by use of a laser cladding technique. The method comprises the following steps: pretreating the surface of a steel material to remove oil contamination and impurities attached on the surface of the steel material; adding Cr3C2 powder to Ni3Al powder and mixing evenly to obtain the mixture of the Ni3Al and the Cr3C2, wherein the content of the Cr3C2 in the mixture is 10wt% to 50wt%; and cladding the mixture on the surface of the steel material by use of the laser cladding technique so that the mixture is formed into the composite coating Ni3Al / Cr3C2 on the surface of the steel material. The composite coating Ni3Al / Cr3C2 obtained by use of the method has remarkable wear-resisting property.

Description

Technical field [0001] The present invention belongs to the field of material processing. Specifically, the present invention relates to a method for preparing Ni by using laser cladding technology. 3 Al / Cr 3 C 2 Composite coating method. Background technique [0002] Heavy-duty diesel engine has the advantages of high thermal efficiency, wide power range, better power-to-weight ratio and power-to-volume ratio, and is the most important supporting equipment for ships and heavy trucks. At present, heavy-duty diesel engines are developing in the direction of high mechanical load, high thermal load and low emissions, which makes direct injection, supercharging and other technologies begin to be widely used. However, due to the application of direct injection, supercharging and other technologies, the working environment of the thermal power machinery and high-temperature transmission friction parts inside the diesel engine has become more and more severe, which has caused the cranks...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C32/00C22C30/00
CPCC23C24/103
Inventor 赵琳田志凌韩伟李长海张岩
Owner CHINA IRON & STEEL RES INST GRP
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