Ceramic reinforced metal-based multi-gradient composite coating as well as preparation method and application thereof

Abstract

The invention discloses a ceramic reinforced metal-based multi-gradient composite coating as well as a preparation method and application thereof. The composite coating comprises a first gradient layer, a second gradient layer and a third gradient layer which are sequentially arranged on the surface of a copper substrate in a laser cladding mode from inside to outside, and the first gradient layer is prepared from, by weight, 80%-90% of aluminum-coated nickel alloy powder and 10%-20% of aluminum bronze and / or cupronickel; the second gradient layer is prepared from the following raw material components: 80 to 85 percent of Ni60, 7 to 10 percent of graphite, 4.5 to 12.7 percent of titanium-iron alloy powder and / or vanadium-iron alloy powder and 0.3 to 0.5 percent of carbon nano tube; the third gradient layer comprises the following raw material components: 74.5-84% of Ni60, 10-15% of graphite, 5-10% of ferrotitanium alloy powder and / or ferrovanadium alloy powder and 0.5-1% of carbon nanotubes, the cracking sensitivity of the coating can be effectively inhibited, and the hardness and wear resistance of the coating are improved.

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