Method for preparing high-temperature-oxidation-resistant ZrB2-Al2O3/MCrAlY metal ceramic coating through rapid laser cladding

A zrb2-al2o3, cermet coating technology, applied in metal material coating process, coating and other directions, can solve the problems of reduced growth rate, difficult to repeat preparation, single crystal MCrAlY powder and high cost of coating production

Active Publication Date: 2021-06-22
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production cost of single crystal MCrAlY powder and coating mentioned in the patent is high, and it is difficult to repeat the preparation, and the thermally grown oxide TGO after high temperature service needs to further reduce the growth rate, purify the composition and phase

Method used

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  • Method for preparing high-temperature-oxidation-resistant ZrB2-Al2O3/MCrAlY metal ceramic coating through rapid laser cladding
  • Method for preparing high-temperature-oxidation-resistant ZrB2-Al2O3/MCrAlY metal ceramic coating through rapid laser cladding
  • Method for preparing high-temperature-oxidation-resistant ZrB2-Al2O3/MCrAlY metal ceramic coating through rapid laser cladding

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Sandblasting roughening: use 240# sandpaper for grinding, and then use white corundum to roughen the superalloy workpiece (white corundum particle size: ~120μm, sandblasting pressure: 0.2~0.8MPa), and then use The mixture of acetone and ethanol is ultrasonically cleaned, the workpiece is thoroughly dried, and then the workpiece is fixed on the rotary table.

[0026] (2) Coating preparation: adopt synchronous powder feeding, laser power is 2000~3000W; powder feeding gas N 2Or Ar pressure is 0.3~0.6MPa, powder feeding gas N 2 Or the flow rate of Ar is 0.1~1m 3 / h, the powder feeding amount is 5-100g / min; the beam scanning moving speed is 250-650mm / s; the circular spot diameter is 3.5mm; the overlap rate of passes is about 45%; the number of cladding layers is 2-20 , the thickness of the cladding coating is 100 μm to 1000 μm. ZrB 2 -Al 2 o 3 / NiCoCrAlHfYSi cermet powder is firstly mixed by mechanical ball milling method, and then granulated by spray dryer, ZrB 2...

Embodiment 2

[0029] (1) Sandblasting roughening: Grinding with 240# sandpaper, and then using white corundum to roughen the superalloy workpiece (white corundum particle size: ~120μm, sandblasting pressure: 0.2~0.8MPa), and then using The mixture of acetone and ethanol is ultrasonically cleaned, the workpiece is thoroughly dried, and then the workpiece is fixed on the rotary table.

[0030] (2) Coating preparation: adopt synchronous powder feeding, laser power is 2000~3000W; powder feeding gas N 2 Or Ar pressure is 0.3~0.6MPa, powder feeding gas N 2 Or the flow rate of Ar is 0.1~1m 3 / h, the powder feeding amount is 5-100g / min; the beam scanning moving speed is 250-650mm / s; the circular spot diameter is 3.5mm; the overlap rate of passes is about 45%; the number of cladding layers is 2-20 , the thickness of the cladding coating is 100 μm to 1000 μm. ZrB 2 -Al 2 o 3 / NiCoCrAlHfYSi cermet powder is firstly mixed by mechanical ball milling method, and then granulated by spray dryer, ZrB ...

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Abstract

The invention discloses a method for preparing a high-temperature-oxidation-resistant ZrB2-Al2O3/MCrAlY metal ceramic coating through rapid laser cladding. The method comprises the following steps that, sand blasting coarsening is carried out, specifically, a high-temperature alloy workpiece is ground, then sand blasting coarsening is carried out through white corundum, ultrasonic cleaning is carried out through acetone and absolute ethyl alcohol mixed liquid, and after thorough drying, the workpiece is fixed to a rotary workbench; a coating is prepared, specifically, the high-temperature-oxidation-resistant ZrB2-Al2O3/MCrAlY metal ceramic coating with the thickness ranging from 100 micrometers to 1000 micrometers is prepared through laser cladding equipment; and heat treatment of the coating is carried out, specifically, post-treatment of vacuum heat treatment is adopted to enable the coating to be free of stress and homogenized in structure and composition. According to the coating obtained through the method, the hardness and the elastic modulus of the coating can be improved, the friction coefficient can be reduced, the high-temperature abrasion performance is improved, the high-temperature oxidation corrosion resistance of the coating is improved, and the coating is more stable in high-temperature service.

Description

technical field [0001] The invention belongs to the field of surface engineering - cladding coating, in particular to a kind of rapid laser cladding preparation of high temperature oxidation resistant ZrB 2 -Al 2 o 3 / MCrAlY cermet coating method. Background technique [0002] MCrAlY composition coating is a classic anti-high temperature oxidation and corrosion coating or the base layer of thermal barrier coating. MCrAlY coating has high strength, good toughness, high hardness, good wear resistance and high temperature oxidation resistance. It is widely used in aerospace, steel, shipbuilding, petrochemical and other industries. The interface of this type of coating prepared by thermal spraying technology is mechanically interlocked, the bonding strength is low, and it is easy to peel off; the cost of this type of coating prepared by electron beam physical vapor deposition is high, and the deposition efficiency is low; the coating preparation technology of multi-arc ion pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C21D1/773
CPCC23C24/103C21D1/773
Inventor 韩玉君初雅杰陈宇谢静玲李浩然
Owner NANJING INST OF TECH
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