Repairing composite layer of amorphous/nanocrystalline cooling roller and preparation method of repairing composite layer

Abstract

The invention belongs to the technical field of material science, and particularly relates to a repairing composite layer of an amorphous / nanocrystalline cooling roller and a preparation method of the repairing composite layer. The composite layer consists of two layers, namely a copper-based alloy layer connected with base materials and a nickel-based alloy layer, wherein the copper-based alloy layer comprises the following components by weight percent: 7-9% of Ni, 8-12% of Sn, 5-15% of Co, 0.8-2% of Si and the balance being Cu; the nickel-based alloy layer comprises one of Ni-Co alloy, Ni-P alloy, Ni-Fe alloy and Ni-Cr alloy, and the weight content of Ni in alloy is 60-75%. The preparation method comprises the following steps of pretreating the surface of the cooling roller, electroplating the copper-based alloy layer and performing wide-strip cladding on the nickel-based alloy layer by a high-power laser. The prepared composite coating is uniform and compact, and excellent in wear resistance and heat resistance, and has the characteristics of high cladding efficiency and high energy absorptivity of the cooling roller to the laser beam.

Description

technical field [0001] The invention belongs to the technical field of material science, and in particular relates to a repairing composite layer of an amorphous / nanocrystalline cooling roll and a preparation method thereof. technical background [0002] Amorphous / nanocrystalline alloys are solidified by ultra-rapid cooling. When the alloy is solidified, the atoms have no time to arrange and crystallize in an orderly manner. The obtained solid alloy has a long-range disordered structure, and there are no grains and grain boundaries of the crystalline alloy. The current amorphous / nanocrystalline production technology is to pour molten alloy steel at 1300°C on the same roll that is cooled by water that rotates at high speed, and instantly cool it below 200°C to form amorphous / nanocrystalline. [0003] The amorphous / nanocrystalline cooling roll is the key equipment for the production of amorphous / nanocrystalline alloy strips. It is mainly lined with copper or copper alloy with...

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Problems solved by technology

[0005] But the repairing method of above-mentioned cooling roll has the following defects: 1. It is necessary to make a primer by plasma spraying first, and then use 5KW CO 2 Laser remelting, followed by laser cladding, the process is complex, and plasma spraying and high power CO 2 The laser equipment is bulky and expensive; 2. Although the combination of nickel-based alloy powder and Co-based alloy solves the problem of cracks in the laser cladding layer, the nickel-based alloy layer is remelted before laser cladding , the laser cladding efficiency of the Co-based alloy is low, and the absorption rate of the laser beam energy by the cooling roll is low

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