Method for forming fluoride spray coating, and fluoride spray coating covered member

Abstract

[Problem] To provide a fluoride spray coating covered member in which a fluoride spray coating firmly adheres by coating carbide cermet to a surface of a substrate and interposing it, and to propose a method therefor. [Solution] A fluoride spray coating is formed in such a manner that an undercoat layer of carbide cermet, which covers a substrate in a film-shaped manner while a tip portion of carbide cermet particles is embedded in the substrate, or a primer part of carbide cermet, is formed by blowing a carbide cermet material at a high velocity by using a spray gun to a surface of the substrate, and after that, a fluoride particle is sprayed thereon.

1 . A method for forming a fluoride spray coating characterized in that an undercoat layer of carbide cermet, which covers a substrate in a film-shaped manner while a tip portion of carbide cermet particles is embedded in the substrate, or a non-film shaped primer part of carbide cermet, is formed by blowing a carbide cermet material by using a spray gun for a high velocity spraying to the roughened substrate surface and after that, a fluoride spray material is sprayed onto the undercoat layer or the primer part. 
     
     
         2 . A method for forming a fluoride spray coating according to  claim 1 , wherein the undercoat layer of carbide cermet is a layer with a film-shaped structure having a layer thickness of 10 μm-150 μm, in which, at a side of a substrate surface, a tip portion of a part of the carbide cermet particles is embedded in the substrate and a thickness is made thicker by increasing a spraying number. 
     
     
         3 . A method for forming a fluoride spray coating according to  claim 1 , wherein the primer part of carbide cermet is made by a non film-shaped structure having such a state that a tip portion of spray particles is stuck as piles and is sparsely upstanding, at a portion of area ratio 8-50% with respect to a substrate surface. 
     
     
         4 . A method for forming a fluoride spray coating according to  claim 1 , wherein the undercoat layer of carbide cermet and the primer part of carbide cermet are formed in such a manner that a spray treatment, in which particles having a particle size of 5-80 μm which is made of one or more metal carbides selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and Si and 5-40 mass % of one or more metals or their alloys selected from Co, Ni, Cr, Al and Mo are blown by using the spray gun for a high velocity blowing which can blow at a flying velocity of 150-600 m/sec., is repeated at 6 times or more in case of the undercoat layer and at 5 times or less in case of the primer part. 
     
     
         5 . A method for forming a fluoride spray coating according to  claim 1 , wherein the substrate is preheated to 80-700° C. prior to a spraying fluoride particles. 
     
     
         6 . A method for forming a fluoride spray coating according to  claim 1 , wherein a spraying method of fluoride is any one spraying method selected from atmospheric plasma spraying method, reduced-pressure plasma spraying method and high-velocity flame spraying method. 
     
     
         7 . A method for forming a fluoride spray coating according to  claim 1 , wherein any of Al and its alloy, Ti and its alloy, carbon steel, stainless steel, Ni and its alloy, oxide, nitride, carbide, silicide, carbon sintered materials and plastics, a surface roughness of which is controlled to be Ra: 0.05-0.74 μm and Rz: 0.09-2.0 μm by blowing abrasives such as Al 2 O 3  and SiC with a blast roughening treatment, is used as the substrate. 
     
     
         8 . A method for forming a fluoride spray coating according to  claim 1 , wherein the fluoride spray coating is a coating by blowing fluoride particles having a particle size of 5 μm-80 μm made of one or more selected from fluorides of: Mg in Group IIa of the Periodic Table; Al in Group IIIb of the Periodic Table; Y in Group IIa of the Periodic Table; and lanthanide series metals of Atomic Numbers 57-71 of the Periodic Table such as La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu onto the substrate surface at thickness of 20 μm-500 μm. 
     
     
         9 . A fluoride spray coating covered member comprising: a substrate, a surface of which is subjected to a roughening treatment; a carbide cermet layer coated to a surface of the substrate; and a fluoride spray coating formed thereon, characterized in that the carbide cermet layer is a film-shaped undercoat layer wherein a part of carbide cermet particles is embedded in the substrate to make a thickness thicker or a primer part of non-film shaped structure having a construction that a tip portion of spray particles is stuck as piles and is sparsely upstanding, by blowing carbide cermet particles having a particle size of 5-80 μm which is made of one or more metal carbides selected from Ti, Zr, Hf, V, Nb, Cr, Mn, W and Si and 5-40 mass % of one or more metals or their alloys selected from Co, Ni, Cr, Al and Mo by using the spray gun for a high velocity blowing. 
     
     
         10 . A fluoride spray coating covered member according to  claim 9 , wherein the undercoat layer of carbide cermet is a layer with a film-shaped structure having a layer thickness of 10 μm-150 μm, in which, at a side of a substrate surface, a tip portion of a part of the carbide cermet particles is embedded in the substrate and a thickness is made thicker by increasing a spraying number. 
     
     
         11 . A fluoride spray coating covered member according to  claim 9 , wherein the primer part of carbide cermet is made by a non-film shaped structure having such a state that a tip portion of spray particles is stuck as piles and is sparsely upstanding, at an area ratio 8-50% with respect to the substrate surface. 
     
     
         12 . A fluoride spray coating covered member according to  claim 9 , wherein any of Al and its alloy, Ti and its alloy, carbon steel, stainless steel, Ni and its alloy, oxide, nitride, carbide, silicide, carbon sintered materials and plastics, a surface roughness of which is controlled to be Ra: 0.05-0.74 μm and Rz: 0.09-2.0 μm by a roughening treatment in which abrasives such as Al 2 O 3  and SiC are blown, is used as the substrate. 
     
     
         13 . A fluoride spray coating covered member according to  claim 9 , wherein the fluoride spray coating has a thickness of 20-500 μm. 
     
     
         14 . A fluoride spray coating covered member according to  claim 9 , wherein the fluoride spray coating is formed in such a manner that fluoride particles having a particle size of 5 μm-80 μm made of a fluoride of one or more materials selected from a group of Mg in Group IIa of the Periodic Table; Al in Group IIIb of the Periodic Table; Y in Group IIIa of the Periodic Table; and lanthanide metals in Atomic Numbers 57-71 of the Periodic Table such as La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu are blown to the substrate surface to be a coating thickness of 20 μm-500 μm.