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Preparation method of high-temperature-resistant anti-abrasion gradient coating for circulating fluidized bed boiler

A circulating fluidized bed and gradient coating technology, applied in the field of materials, can solve problems such as limiting the popularization and application of circulating fluidized bed boilers

Inactive Publication Date: 2017-04-05
WUXI MINGSHENG TEXTILE MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This defect has not been well resolved, which limits the further popularization and application of circulating fluidized bed boilers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A circulating fluidized bed boiler with high temperature resistance and anti-abrasion Cr 3 C 2 -NiCr-BN-Si 3 N 4 The preparation method of gradient coating, it comprises:

[0023] (1) roughen the surface of circulating fluidized bed boiler components by sandblasting;

[0024] (2) wash the surface roughened by sandblasting successively with acetone and ethanol, and dry;

[0025] (3) Plasma spray NiCrAlY intermediate coating on the roughened and cleaned surface, and then plasma spray Cr 3 C 2 -NiCr-BN-Si 3 N 4 For particles, the plasma spraying process conditions include: main gas pressure 0.7MPa, auxiliary gas pressure 0.6MPa, main gas flow rate 1300l / h, auxiliary gas flow rate 900l / h, arc current 450A, arc voltage 85V, powder feeding gas pressure 0.2MPa , the powder feeding air flow rate is 280l / h, the spraying distance is 100mm, the spraying speed is 2kg / h, and the coating thickness is 1mm.

Embodiment 2

[0027] A circulating fluidized bed boiler with high temperature resistance and anti-abrasion Cr 3 C 2 -NiCr-BN-Si 3 N 4 The preparation method of gradient coating, it comprises:

[0028] (1) roughen the surface of circulating fluidized bed boiler components by sandblasting;

[0029] (2) wash the surface roughened by sandblasting successively with acetone and ethanol, and dry;

[0030] (3) Plasma spray NiCrAlY intermediate coating on the roughened and cleaned surface, and then plasma spray Cr 3 C 2 -NiCr-BN-Si 3 N 4 For particles, the plasma spraying process conditions include: main gas pressure 1.0MPa, auxiliary gas pressure 0.9MPa, main gas flow rate 1800l / h, auxiliary gas flow rate 1100l / h, arc current 600A, arc voltage 100V, powder feeding gas pressure 0.4MPa , the powder feeding air flow rate is 400l / h, the spraying distance is 150mm, the spraying speed is 3kg / h, and the coating thickness is 2.5mm.

Embodiment 3

[0032] A circulating fluidized bed boiler with high temperature resistance and anti-abrasion Cr 3 C 2 -NiCr-BN-Si 3 N 4 The preparation method of gradient coating, it comprises:

[0033] (1) roughen the surface of circulating fluidized bed boiler components by sandblasting;

[0034] (2) wash the surface roughened by sandblasting successively with acetone and ethanol, and dry;

[0035] (3) Plasma spray NiCrAlY intermediate coating on the roughened and cleaned surface, and then plasma spray Cr 3 C 2 -NiCr-BN-Si 3 N 4 For particles, the plasma spraying process conditions include: main air pressure 0.8MPa, auxiliary air pressure 0.7MPa, main air flow 1500l / h, auxiliary air flow 1000l / h, arc current 500A, arc voltage 90V, powder feeding air pressure 0.3MPa , the powder feeding air flow rate is 350l / h, the spraying distance is 120mm, the spraying speed is 2.5kg / h, and the coating thickness is 2mm.

[0036] The coating prepared in Example 1-2, after 100 hours of actual use, wa...

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Abstract

The invention discloses a preparation method of a high-temperature-resistant anti-abrasion gradient coating for a circulating fluidized bed boiler. The preparation method includes the steps of: 1) performing sand blast coarsening to surfaces of parts in the circulating fluidized bed boiler; 2) successively washing the sand blast coarsened surface by means of acetone and ethanol, and drying the surface; 3) performing plasma spray coating on the coarsened and cleaned surface to form a NiCrAlY inter-coating, and then plasma-spray-coating the surface with Cr3C2-NiCr-BN-Si3N4 particles, wherein parameters of the plasma spray coating are described as follows: main gas pressure is 0.7-1.0 MPa, assistant gas pressure is 0.6-0.9 MPa, main gas flow rate is 1300-1800 l / h, assistant gas flow rate is 900-1100 l / h, arc current is 450-600 A, arc voltage is 85-100 V, powder delivery gas pressure is 0.2-0.4 MPa, powder delivery gas flow rate is 280-400 l / h, spray coating distance is 100-150 mm, spray coating speed is 2-3 kg / h, and spraying coating thickness is 1-2.5 mm. The coating, when being applied on the circulating fluidized bed boiler, has the effect of high-temperature corrosion resistance and high-temperature abrasion resistance, and is firm and is free of falling off.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a circulating fluidized bed boiler high temperature resistant and anti-abrasion Cr 3 C 2 -The preparation method of NiCr-BN gradient coating. Background technique [0002] The difference between a circulating fluidized bed boiler and a conventional boiler is that its combustion system is different. Gas-solid material separation equipment and solid material recirculation equipment are the main features of circulating fluidized bed boilers. The combustion of circulating fluidized bed boiler includes two processes of internal circulation and external circulation. The internal circulation is the circulation process in the furnace, that is, the flue gas moving at high speed in the furnace is in close contact with the solid particles with strong turbulent disturbance, and there are a large number of Fluidized combustion reaction process with particle backmixing. The outer circulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/06C23C28/02
CPCC23C4/06C23C28/028
Inventor 张达明
Owner WUXI MINGSHENG TEXTILE MACHINERY
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