Structure and method for improving adhesion strength of coating

Abstract

A method and a structure for improving adhesion strength of a coating are provided. The method includes: step 1 ), preparing textured patterns, where at least one type of pattern is textured on a surface of a substrate using a laser process based on bionics; step 2 ), regulating a parameter, where a spraying process parameter is regulated based on a parameter of the textured patterns; and step 3 ), spraying a coating, where spraying is performed on the substrate obtained in step 1 ) using a supersonic plasma spraying method.

1 . A method for improving adhesion strength of a coating, comprising:
 step  1 ), preparing textured patterns, wherein at least one type of patterns are textured on a surface of a substrate using a laser process based on bionics;   step  2 ), regulating a parameter, wherein a spraying process parameter is regulated based on a parameter of the textured patterns formed in step  1 ); and   step  3 ), spraying a coating, wherein spraying is performed on the substrate obtained in step  1 ) using a supersonic plasma spraying method.   
     
     
         2 . The method for improving the adhesion strength of the coating according to  claim 1 , wherein the parameter of the textured patterns comprises one or more of a pattern shape, a pattern distance, a pattern dimension and pattern arrangement. 
     
     
         3 . The method for improving the adhesion strength of the coating according to  claim 2 , wherein the pattern shape comprises one of a channel shape, a square, a regular hexagon and a circle, or a combination thereof. 
     
     
         4 . The method for improving the adhesion strength of the coating according to  claim 2 , wherein the pattern dimension comprises one of a depth, a side length, a width and a diameter, or a combination thereof. 
     
     
         5 . The method for improving the adhesion strength of the coating according to  claim 3 , wherein the pattern shape comprises the channel shape and the circle, the channel shape and the circle are combined alternately, and the step  1 ) comprises:
 texturing at least three columns of circular patterns, wherein a preset distance is reserved between each pair of adjacent columns of circular patterns, the preset distance is greater than a width of a channel-shaped pattern to be textured, and   texturing a column of channel-shaped patterns between each pair of adjacent columns of circular patterns.   
     
     
         6 . The method for improving the adhesion strength of the coating according to  claim 3 , wherein the pattern shape comprises the regular hexagon and the square, the regular hexagon and the square are combined alternately, and the step  1 ) comprises:
 texturing at least three columns of square patterns, wherein a preset distance is reserved between each pair of adjacent columns of square patterns, the preset distance is greater than a length of the longest diagonal line of a regular-hexagonal pattern to be textured; and   texturing a column of regular-hexagonal patterns between each pair of adjacent columns of square patterns.   
     
     
         7 . The method for improving the adhesion strength of the coating according to  claim 3 , wherein the pattern shape comprises the regular hexagon and the circle, the regular hexagon and the circle are combined alternately, and the step  1 ) comprises:
 texturing at least three columns of circular patterns, wherein a preset distance is reserved between each pair of adjacent columns of circular patterns, the preset distance is greater than a length of the longest diagonal line of a regular-hexagonal pattern to be textured; and   texturing a column of regular-hexagonal patterns between each pair of adjacent columns of circular patterns.   
     
     
         8 . The method for improving the adhesion strength of the coating according to  claim 3 , wherein the pattern shape comprises the square and the circle, the square and the circle are combined alternately, and the step  1 ) comprises:
 texturing at least three columns of circular patterns, wherein a preset distance is reserved between each pair of adjacent columns of circular patterns, the preset distance is greater than a side length of a square pattern to be textured; and   texturing a column of square patterns between each pair of adjacent columns of circular patterns.   
     
     
         9 . The method for improving the adhesion strength of the coating according to  claim 3 , wherein the pattern shape comprises the square and the channel shape, and the square and the channel shape are combined alternately, and the step  1 ) comprises:
 texturing at least three columns of channel-shaped patterns, wherein a preset distance is reserved between each pair of adjacent columns of channel-shaped patterns, the preset distance is greater than a side length of a square pattern to be textured; and   texturing a column of square patterns between each pair of adjacent columns of channel-shaped patterns.   
     
     
         10 . The method for improving the adhesion strength of the coating according to  claim 3 , wherein the pattern shape comprises the regular hexagon and the channel shape, the regular hexagon and the channel shape are combined alternately, and the step  1 ) comprises:
 texturing at least three columns of channel-shaped patterns, wherein a preset distance is reserved between each pair of adjacent columns of channel-shaped patterns, the preset distance is greater than a length of the longest diagonal line of a regular-hexagonal pattern to be textured; and   texturing a column of regular-hexagonal patterns between each pair of adjacent columns of channel-shaped patterns.   
     
     
         11 . The method for improving the adhesion strength of the coating according to  claim 1 , before step  1 ), further comprising a substrate preprocessing step of polishing and cleaning the surface of the substrate. 
     
     
         12 . The method for improving the adhesion strength of the coating according to  claim 1 , wherein in step  1 ), the substrate is made of stainless steel. 
     
     
         13 . The method for improving the adhesion strength of the coating according to  claim 1 , wherein
 the coating in step  3 ) is a NiCrBSi ceramic coating,   the sprayed coating obtained by the supersonic plasma spraying method has a thickness of approximately 500 μm, and   a particle size of used NiCrBSi powder ranges from 50 μm to 60 μm.   
     
     
         14 . The method for improving the adhesion strength of the coating according to  claim 4 , wherein the textured patterns prepared in step  1 ) have a depth ranging from 30 μm to 120 μm, and a diameter ranging from 35 μm to 65 μm. 
     
     
         15 . A structure for improving adhesion strength of a coating, comprising:
 a substrate;   textured patterns having at least one type of pattern prepared on the substrate; and   a coating sprayed on the textured patterns.   
     
     
         16 . The structure according to  claim 15 , wherein the textured pattern is in a shape of one of a square, a channel shape, a circle and a regular hexagon, or a combination thereof. 
     
     
         17 . The structure according to  claim 15 , wherein the substrate is made of stainless steel, and the coating is a NiCrBSi ceramic coating.