Nickel-based wear-resistant coating based on plasma cladding and preparation method thereof

Abstract

A nickel-based wear-resistant coating based on plasma cladding and a preparation method thereof are provided. The preparation method solves a technical problem that WC is easy to settle during the preparation of a single WC coating, resulting in a large number of air pores and cracks in an obtained cladding layer. A cladding powder for preparing the nickel-based wear-resistant coating includes a WC powder with a mass percentage of 45% to 65%, a TiC powder with a mass percentage of 1% to 3%, an Yb 2 O 3 powder with a mass percentage of 1% to 3%, and a Ni 60 powder as a balance. The Yb 2 O 3 powder is added to improve a fluidity of the plasma cladding powder, increase a solubility of the WC, promote decomposition of WC particles, and precipitate an alloy hard phase. The nickel-based wear-resistant coating shows high hardness and desirable wear resistance.

What is claimed is: 
     
         1 . A nickel-based wear-resistant coating based on plasma cladding, wherein a cladding powder of the nickel-based wear-resistant coating comprises a WC powder with a mass percentage of 45% to 65%, a TiC powder with a mass percentage of 1% to 3%, an Yb 2 O 3  powder with a mass percentage of 1% to 3%, and a Ni60 powder as a balance. 
     
     
         2 . The nickel-based wear-resistant coating based on plasma cladding according to  claim 1 , wherein the WC powder has a particle size of 74 μm to 124 μm, the TiC powder has a particle size of 48 μm to 74 μm, the Yb 2 O 3  powder has a particle size of 38 μm to 75 μm, and the Ni60 powder has a particle size of 48 μm to 104 μm. 
     
     
         3 . A preparation method of a nickel-based wear-resistant coating based on plasma cladding, comprising the following steps:
 step 1, subjecting a surface of a metal sheet substrate to cleaning and pretreatment;   step 2, preparing a cladding powder of the nickel-based wear-resistant coating, wherein the cladding powder comprises a WC powder with a mass percentage of 45% to 65%, a TiC powder with a mass percentage of 1% to 3%, an Yb 2 O 3  powder with a mass percentage of 1% to 3%, and a Ni60 powder as a balance; and mixing the cladding powder evenly in a planetary ball mill and storing under vacuum to obtain a plasma cladding powder;   step 3, cladding the plasma cladding powder prepared in step 2 on the surface of the metal sheet substrate treated in step 1 by plasma cladding such that the plasma cladding powder forms the nickel-based wear-resistant coating on the surface of the metal sheet substrate; and   step 4, conducting a post-treatment.   
     
     
         4 . The preparation method of a nickel-based wear-resistant coating based on plasma cladding according to  claim 3 , wherein the cleaning and pretreatment in step 1 comprises: polishing the metal sheet substrate with sandpaper, subjecting a resulting polished metal sheet substrate to ultrasonic cleaning in anhydrous ethanol, and then drying a resulting cleaned metal sheet substrate for later use. 
     
     
         5 . The preparation method of a nickel-based wear-resistant coating based on plasma cladding according to  claim 3 , wherein the planetary ball mill in step 2 works at 220 r/min to 260 r/min for 8 h to 12 h, and a ball mill tank of the planetary ball mill is a vacuum stainless steel tank. 
     
     
         6 . The preparation method of a nickel-based wear-resistant coating based on plasma cladding according to  claim 3 , wherein the plasma cladding in step 3 comprises the following parameters: a main arc current of 80 A to 120 A, a pilot arc current of 23 A to 27 A, a scanning speed of 180 mm/min to 250 mm/min, a powder feeding rate of 15 g/min to 20 g/min, an ion gas flow rate of 1.5 L/min to 3 L/min, a powder feeding gas flow rate of 1.5 L/min to 3 L/min, and a shielding gas flow rate of 10 L/min to 15 L/min. 
     
     
         7 . The preparation method of a nickel-based wear-resistant coating based on plasma cladding according to  claim 3 , wherein the plasma cladding powder in the plasma cladding in step 3 is delivered to the surface of the metal sheet substrate by coaxial powder feeding. 
     
     
         8 . The preparation method of a nickel-based wear-resistant coating based on plasma cladding according to  claim 3 , wherein the post-treatment in step 4 is one selected from the group consisting of room-temperature natural cooling, sand cooling, oil cooling, and annealing. 
     
     
         9 . The preparation method of a nickel-based wear-resistant coating based on plasma cladding according to  claim 3 , wherein the WC powder has a particle size of 74 μm to 124 μm, the TiC powder has a particle size of 48 μm to 74 μm, the Yb 2 O 3  powder has a particle size of 38 μm to 75 μm, and the Ni60 powder has a particle size of 48 μm to 104 μm.