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Nickel-coated graphite sealing coating on surface of cast-iron workpiece, and preparation method of nickel-coated graphite sealing coating

A nickel-coated graphite and sealing coating technology is applied in the field of thermal spraying nickel-coated graphite sealing coating on cast iron surface and its preparation. Dense, low cost, well combined effect

Pending Publication Date: 2020-11-10
宁波思朴锐机械再制造有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the high flame temperature of plasma spraying, it is easy to cause graphite to burn out during the spraying process, which affects the self-lubricating performance of the coating [5 Yu Fangli, Bai Yu, Wu Xiuying, etc., Corrosion resistance and corrosion resistance of plasma sprayed nickel-based abradable seal coating Analysis of wear resistance [J]. Journal of Inorganic Materials, 2016, 31(7): 687-693]

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  • Nickel-coated graphite sealing coating on surface of cast-iron workpiece, and preparation method of nickel-coated graphite sealing coating
  • Nickel-coated graphite sealing coating on surface of cast-iron workpiece, and preparation method of nickel-coated graphite sealing coating

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preparation example Construction

[0029] (2) Preparation of bonding layer. The selected NiAl wire has a diameter of 1-4µm, and the bonding layer NiAl coating is prepared on the surface of the base material by arc spraying method. The parameters of the arc spraying process include: spraying current 120-180A; spraying voltage 25-35V; atomization The air pressure is 0.4-0.8MPa, and the spraying distance is 100-180mm.

[0030] (3) Preparation of nickel-coated graphite surface layer. The particle size of the nickel-coated graphite powder selected for the preparation of the nickel-coated graphite coating is 90-150 μm, and the nickel-coated graphite powder is sprayed on the substrate with a bonding bottom layer by using the flame spraying method to obtain NiAl / nickel-coated Graphite double layer structure abradable sealing coating system. Among them, the parameters of flame spraying process include: oxygen pressure: 0.5~1.0MPa; oxygen flow: 70~100L / h; acetylene pressure: 0.05~0.20MPa; acetylene flow: 30~70L / h; powd...

Embodiment 1

[0033] A NiAl / nickel-coated graphite double-layer coating structure is prepared on the cast iron substrate, the inner layer is: bonding layer, NiAl layer; the surface layer: nickel-coated graphite layer.

[0034] The steps of coating preparation are as follows:

[0035]Step 1: Perform sandblasting pretreatment on the surface of the cast iron substrate, and the sandblasting pressure is 0.4MPa;

[0036] Step 2: Using a wire arc spraying system, spray the above-mentioned NiAl wire with a suitable particle size on the pretreated substrate. The spraying process parameters are shown in Table 1, and the thickness of the coating is 50-70 μm;

[0037] Table 1 shows the process parameters of arc spraying NiAl coating:

[0038]

[0039] Step 3: Using a flame spraying system, spray the above-mentioned nickel-coated graphite powder with a suitable particle size on the base material with a bonding layer NiAl layer, and the spraying process parameters are shown in Table 2;

[0040] Tabl...

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Abstract

The invention relates to a nickel-coated graphite sealing coating on the surface of a cast-iron workpiece, and a preparation method of the nickel-coated graphite sealing coating, and belongs to the technical fields of composite materials and thermal spraying. The bonding strength of the coating and a matrix is increased by taking a NiAl metal coating as a bonding layer, a nickel-coated graphite coating is sprayed on the surface as a self-lubricating coating, a stable abradable coating system based on the thermal spraying on the cast-iron surface is formed through combination, a gap between anair compressor and a cartridge receiver can be effectively filled, good impact resistance and thermal shock resistance are achieved, and therefore the working efficiency of the air compressor is increased; and the NiAl bonding layer is prepared through electric arc spraying for wires, and the large-particle-size nickel-coated graphite sealing coating is prepared through flame spraying. The double-layer coating system prepared by the preparation method is compact in microstructure; high bonding performance between the coatings and between the coating and the cast-iron matrix is achieved; and graphite phases are uniformly distributed in the coating. Meanwhile, the nickel-coated graphite sealing coating on the surface of the cast-iron workpiece has the advantages of being low in graphite oxidation loss rate, simple in process, low in cost, high in efficiency, high in repeatability, suitable for large-scale production, and the like.

Description

technical field [0001] The invention relates to a thermally sprayed nickel-coated graphite sealing coating on the surface of cast iron and a preparation method thereof, which belongs to the technical field of composite materials and thermal spraying, and is mainly used in the field of abradable sealing coatings of cast iron. Background technique [0002] Cast iron has the characteristics of high strength, fatigue resistance, good machining performance, shock absorption and energy absorption, etc., and is widely used in engine cylinders, gearbox housings, crankshafts, gears and other components. But for severe solid lubrication conditions, the graphite content in cast iron is relatively low, which cannot meet the requirements of solid lubrication [1 Gao Peihu, Wang Qiang, Li Jianping. Research on impact wear properties of compacted graphite cast iron [J]. Thermal Processing Technology, 2016, 45(1): 31-34], thus limiting the scope of its application. How to endow the surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/131C23C4/129C23C4/06C23C4/08
CPCC23C4/06C23C4/08C23C4/129C23C4/131
Inventor 尹志坚陈煌肖展业张嵩琳尹双敏李海静
Owner 宁波思朴锐机械再制造有限公司
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