Composition for treating refractory materials for brazing

Abstract

A coating composition that enables refractory materials such as ceramics to be joined to one another or to metallic components using brazing filler metals. The composition is applied on selected areas of the refractory material to define a target area for brazing. In one embodiment, the coating composition includes (i) a Group IVB transition metal component selected from the group consisting of a Group IVB transition metal, a hydride thereof, and mixtures of the Group IVB metals and/or hydrides thereof, (ii) a binder material, and (iii) a fluid carrier. In disclosed embodiments, the Group IVB transition metal component is titanium, and the binder material is a combination of a hydrocarbon resin and a styrene block copolymer.

1 . A coating composition for preparing a surface of a refractory material for joining with a like-coated refractory material or a metallic component, comprising: 
 a Group IVB transition metal component selected from the group consisting of a Group IVB transition metal, a Group IVB transition metal hydride, and mixtures thereof;    a binder including a hydrocarbon resin and styrene block copolymer; and    a fluid carrier.    
     
     
         2 . The coating composition of  claim 1 , wherein the binder comprises a hydrogenated hydrocarbon resin.  
     
     
         3 . The coating composition of  claim 1 , wherein the Group IVB transition metal component comprises between about 10 and 90 weight percent titanium or titanium hydride metal powder, and the binder comprises between about 90 and 10 weight percent of a hydrogenated hydrocarbon resin and styrene block copolymer.  
     
     
         4 . The coating composition of  claim 1 , wherein the fluid carrier is selected from the group consisting of aliphatic hydrocarbon solvents, aromatic hydrocarbon solvents, alcohols, ketones, esters, glycol, glycol ether, glycerin, water, paraffinic hydrocarbon solvents, hydro treated light petroleum distillate hydrocarbon solvents, and mixtures thereof.  
     
     
         5 . The coating composition of  claim 1 , wherein the Group IVB transition metal component is in the form of a powder with a mesh size of between about −80 and −400.  
     
     
         6 . The coating composition of  claim 1 , wherein the Group IVB transition metal component is in the form of a powder with a mesh size of about −325.  
     
     
         7 . First and second non-metallic refractory bodies each of which has a surface that is coated with the composition of  claim 1 , and the bodies are joined to one another by placing a brazing filler metal alloy between the coated surfaces of the bodies and heating the bodies to a liquidus temperature of the brazing filler metal alloy.  
     
     
         8 . The joined refractory bodies of  claim 7 , wherein the transition metal component of the composition is present in an amount of between about 2 and 8 weight percent of a combined weight of the transition metal component and the brazing filler metal alloy.  
     
     
         9 . A non-metallic refractory body, and a ferrous or non-ferrous metal body, wherein at least the non-metallic refractory body has a surface that is coated with the composition of  claim 1 , and the bodies are joined to one another by placing a brazing filler metal alloy on the coated surface of the non-metallic refractory body and heating the bodies to a liquidus temperature of the brazing filler metal alloy.  
     
     
         10 . The joined bodies of  claim 9 , wherein the transition metal component of the composition is present in an amount of between about 2 and 8 weight percent of a combined weight of the transition metal component and the brazing filler metal alloy.  
     
     
         11 . A coating composition according to  claim 1 , wherein the transition metal component comprises titanium, zirconium, hafnium, or mixtures thereof.  
     
     
         12 . (canceled)  
     
     
         13 . A coating composition according to  claim 1 , wherein the composition is comprised of about 35 weight percent of the transition metal component, and about 65 weight percent of the binder and the fluid carrier.  
     
     
         14 . A coating composition according to  claim 1 , wherein the composition is comprised of about 65 weight percent of the transition metal component, and about 35 weight percent of the binder and the fluid carrier.  
     
     
         15 . An article of manufacture, comprising: 
 a metallic component having a first surface; and    a ceramic component joined to the metallic component, wherein the ceramic component has a second surface and is joined to the ceramic component by:    coating the second surface of the ceramic component with the coating composition of  claim 1;     drying the coated second surface;    placing a brazing filler metal alloy in a given form on said coated second surface; and    brazing the first surface of the metallic component to the second surface of the ceramic component.    
     
     
         16 . An article of manufacture according to  claim 15 , wherein the transition metal component of the composition is present in an amount of between about 2 and 8 weight percent of a combined weight of the transition metal component and the brazing filler metal alloy.