Study On Preparation And Bonded Performance Of Adhesive Coating

In this study, inorganic adhesive coating was investigated which can endure high temperature of 600℃for a long time, and the related mechanics was also researched. Different kinds of adhesive were compared with each other. The coating was prepared by adding ceramic aggregate to it, with the adhesive base of phosphoric acid in the inorganic adhesive, tailor-made copper oxide, and aluminum dihydrogen phosphate. In theory, double coating has determinate superiority comparing to the single coating. So double coating was chosen in the coated process, the reaction of phosphoric acid and tailor-made copper oxide was the mainly adhesive base for bonding transition, the modified adhesive of cupric phosphate was investigated, the dispensation of bonding transition was obtained, with the optimal thickness of 0.2mm. The relation between Al/PO4 mol ratio solubleness and the quantity of phosphoric acid and Riopone was gained in the experiment. The surface coating was optimized using the uniform design method, with the main index of abradability. By taking this into consideration, the recipe of the surface coating was obtained; the heat treating solidification suitable for this coating was also established.The coating was detected in this study. The density was 2.18g/mm3; the strength of extension and shearing strength were 4.56MPa and 9.02MPa respectively; the fragility was 0.35; the flexibility of the bonding transition reachedФ3mm in GB1731-79; the coating did not have tearing tendency; the adhesivity reached 3 degree in JISD0202; the time of normal temperature solidify was 30min; the wear-resisting property was 3 times than 20# steel; the enduring high-temperature wa 700℃;the heat shock was 650℃; and the coating can improve the property of antioxidation obviously.Aluminum dihydrogen phosphate can be made by two methods; one was using the reactant of phosphoric acid and tailor-made copper oxide, another one was using by phosphoric acid and Riopone. Aluminum dihydrogen phosphate made by the two methods were all inorganic high molecular polymer, with well bond strength. Aluminum dihydrogen phosphate was covered in the surrounding region of the ceramic aggregate and solidified into adhesive coating in room-temperature. The coating and the substrate was jointed closely through mechanical anchorage and diffuse. The unreacted copper oxide was deacidized to copper by phosphorus. The ceramic aggregate had excellent wear-resistance property, which could be excavated to form cavity in the action of abrasion, the edge of the cavity would desquamate later, this was the main reason that the adhesive coating was out of work in the end. The coating could prevent the oxygen entering into the substrate effectively, it was because that the coating had a property of mechanical block, which increased the diffusion distance of oxygen.The heat transfer pipe using in a practical work condition was simulated, by applying finite element simulation software. It can be found that the prepared coating has heat insulation and elevated temperature properties, and the heat stress of the coating concentrated in the bonding interface between the coating and the substrate.