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
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[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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