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Method for spraying and preparing high temperature sulfidation resistant alloy layer on the surface of cast iron

A technology of surface spraying and high temperature resistance, which is applied in the direction of coating, metal material coating process, molten spraying, etc., can solve the problems of poor high temperature vulcanization resistance, etc., achieve improved anti vulcanization performance, prevent high temperature corrosion, and low porosity Effect

Inactive Publication Date: 2009-11-11
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of poor high-temperature vulcanization resistance on the surface of existing cast iron parts, and to develop a method for preparing a high-temperature vulcanization-resistant alloy layer by spraying on the surface of cast iron. Process method for preparing high-temperature vulcanization-resistant alloy layer on cast iron surface by combined method of acetylene flame powder spraying and high-speed arc wire spraying

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take a disc-shaped iron casting with a thickness of 40mm and a diameter of φ200mm, and spray on its surface to prepare a high-temperature vulcanization-resistant alloy layer. The process steps are as follows:

[0026] The first step is to turn the surface of the cast iron to remove the oil and rust on the surface and expose a clean and rough metal surface.

[0027] The second step is to use the subsonic oxyacetylene flame thermal spraying method to spray a nickel-clad aluminum alloy powder primer with a thickness of 120 μm to 140 μm on the surface of the cast iron. Its composition is calculated by mass percentage: Ni 78-82%wt, Al 18-22%wt; process parameters are: oxygen pressure 0.6MPa~0.8MPa, acetylene pressure 0.08MPa~0.10MPa, spraying distance 160mm~180mm, The powder feeding rate is 80g~100g / min, and the spraying angle is 80°~85°.

[0028]The third step is to use the high-speed electric arc wire spraying method to spray a FeCrAl working layer with a thickness of 100...

Embodiment 2

[0030] Take a cast iron plate with a thickness of 40mm and a length and width of 300mm×200mm, and spray on its surface to prepare a high-temperature vulcanization-resistant alloy layer. The process steps are:

[0031] The first step is to grind the surface of the cast iron with a manual grinding wheel to remove the oil and scale on the surface, and expose a clean and rough metal surface.

[0032] The second step is to use the subsonic oxyacetylene flame thermal spraying method to spray aluminum-clad nickel alloy powder primer with a thickness of 120 μm to 140 μm on the surface of the cast iron. The primer is made of aluminum-coated nickel composite powder with a particle size of -150 to +320 Its composition is calculated by mass percentage: Ni 85-90%wt, Al 10-15%wt; process parameters are: oxygen pressure 0.5MPa~0.7MPa, acetylene pressure 0.06MPa~0.09MPa, spraying distance 180mm~200mm, The powder feeding rate is 100g~120g / min, and the spraying angle is 80°~85°.

[0033] The t...

Embodiment 3

[0035] Take a cast iron plate with a thickness of 50mm and a length and width of 600mm×300mm, and spray on its surface to prepare a high-temperature vulcanization-resistant alloy layer. The process steps are:

[0036] The first step is to grind the surface of the cast iron with a manual grinding wheel to remove the oil and scale on the surface, and expose a clean and rough metal surface.

[0037] The second step is to use the subsonic oxyacetylene flame thermal spraying method to spray a nickel-clad aluminum alloy powder primer with a thickness of 120 μm to 140 μm on the surface of the cast iron. The primer is made of nickel-clad aluminum composite powder with a particle size of -150 to +320 Mesh, its composition in terms of mass percentage is: Ni 80%wt, Al 20%wt; process parameters: oxygen pressure 0.7MPa~0.8MPa, acetylene pressure 0.09MPa~0.12MPa, spraying distance 200mm~220mm, powder feeding volume 130g ~150g / min, spraying angle 85°~90°.

[0038] The third step is to use t...

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Abstract

The invention belongs to the technical field of metal surface spray and provides a method for spraying and preparing a high temperature sulfidation resistant alloy layer on the surface of cast iron. The method includes the following steps of: (1) pre-treating the surface of a cast iron workpiece before spraying, and exposing the clean and coarsening metal surface of the workpiece; (2) adopting a subsonic speed oxyacetylene flame hot spray method to spray prime coat on the surface of the cast iron workpiece, wherein the prime coat adopts nickel aluminum compound powder; and (3) adopting a high speed arc wire spray method to spray an FeCrAl working layer on the surface of the cast iron workpiece. The technique of the invention is characterized by simple and convenient operation and strong applicability, can save high alloy material and is convenient for promotion and use. Compared with the overall high temperature sulfidation resistant material, the cast iron part prepared by means of the method is low in cost, has excellent resistance to high temperature sulfidation and favorable wearing resistance, and can strikingly improve the service life of the cast iron part in a high temperature sulfidation environment.

Description

Technical field: [0001] The invention belongs to the technical field of metal surface spraying, and in particular relates to a method for preparing a high-temperature vulcanization-resistant alloy layer by spraying the surface of cast iron. Background technique: [0002] High-temperature vulcanization of iron-based materials (including steel and cast iron) is a type of high-temperature corrosion commonly found in oil refining, petrochemical, thermal power generation, coal gasification and liquefaction, and various combustion furnaces. Whether in sulfur vapor or in H 2 S-H 2 In a mixed atmosphere, iron-based alloys have poor resistance to high-temperature sulfidation corrosion, and it is urgent to improve the high-temperature sulfidation resistance of the surface of iron-based materials. [0003] to produce CS 2 Chemical gasification reactor as an example. The furnace body in the furnace is made of gray cast iron, and it is a split structure, that is, a cage structure. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/06C23C4/08C23C4/02C23C4/073C23C4/129C23C4/131
Inventor 袁庆龙苏永安
Owner HENAN POLYTECHNIC UNIV
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