The invention discloses a method for providing the surface of a workpiece with a metallic layer which is first applied and subsequently fused on the workpiece. The method of the invention comprises the steps of applying a supporting layer from a ceramic oxide material at least onto the portion of the workpiece covered by the applied metallic surface layer, said ceramic oxide material being applied by thermal spraying in a thickness ranging from 0.01 to 5.0 mm. or subsequently fusing said metallic layer by supplying heat thereto and of removing the supporting layer after the cooling down of the workpiece.

The present invention relates to an enamel coating device for a fin tube and its method and, more particularly, to an enamel coating device for a fin tube for efficiently coating a fin tube with enamel. The configuration of the present invention for achieving the objects provides an enamel coating device for a short fin tube that is not deformed at a high temperature, the device including: a conveying unit that conveys a fin tube having a hollow tube and a fin spirally formed on the outer side of the tubes; an applying unit that applies glaze powder to the fin tubes loaded by the conveying unit; and heating units that are disposed at both sides of the applying unit to heat the fin tubes, in which the glaze powder is pure frit.

A composition comprising a glass-forming binder component and a particulate corrosion resistant component. The particulate corrosion resistant component comprises corrosion resistant particulates having: a CTE_p of at least 4 and being solid at a temperature of about 1300°F (704°C) or greater; and a maximum median particle size defined by one of the following formulas: (a) for a CTE_p of 8 or less, an M_p equal to or less than (4.375 x CTE_p) - 10; and (b) for a CTE_p of greater than 8, an M_p equal to or less than (-4.375 x CTE_p) + 60, wherein CTE_p is the average CTE of the corrosion resistant particulates and wherein M_p is the median equivalent spherical diameter (ESD), in microns, of the corrosion resistant particulates. Also disclosed is an article (30) comprising a turbine component (30) comprising a metal substrate (60) and a corrosion resistant coating (64, 164) overlaying the metal substrate (60), as well as a method for forming at least one layer (168) of the corrosion resistant coating (64, 164) adjacent to the metal substrate (60). The corrosion resistant coating (64, 164) has a maximum thickness defined by one of the following formulas: (3) for a CTE_p of 8 or less, an T_c equal to or less than (1.5 x CTE_p) - 3.5; and (4) for a CTE_p of greater than 8, an T_c equal to or less than (-1.5 x CTE_p) + 20.5, wherein T_c is the thickness, in mils, of the corrosion resistant coating.

Bei einem Blech, welches für Lagertanks, Rohre oder ähnliche Anwendungsfälle geeignet ist, schlägt die Erfindung vor, auf der Außenseite eine zweischichtige Emaillierung vorzusehen und auf der Innenseite eine Emailschicht und eine rauhe Silikatschicht auf das Blech aufzubringen, die anschließend mit einem Kunststoff überzogen wird. Auf diese Weise wird das Blech besonders chemie- kalienbeständig und mechanisch beanspruchbar.

A damaged area of the glass layer of equipment having a glass lining on a metal substrate is repaired by grinding the damaged area to expose the metal substrate, welding onto the exposed metal substrate, especially by electrical resistance spot welding, a metallic fiber sheet, impregnating the metallic fiber sheet with a vitrifiable metallic alkoxide repairing agent as a sol-gel solution and solidifying the repairing agent, vitrifying the repairing agent by heating it to a temperature, such as 300°C to 350°C, not high enough to cause damaging stress in the surrounding glass layer and then filling any remaining voids in the repaired area by applying and vitrifying fresh repairing agent. The sol-gel repairing agent solution as used to impregnate the metallic fiber sheet may contain glass or ceramic in powder form as a filler but the further repairing agent used as aforesaid to fill any remaining voids should not contain such filler.

There is provided a method of repairing a damaged por­tion in the glass layer of glass-lined steel equipment wherein, as a first step, a first repair medium is applied to the damaged portion, solidified and adhered chemically to the steel by a sol-gel process, with the application of heat. In a second step, a second repair medium is applied on to the first layer, which second layer includes an inorganic filler and is solidified by a sol-gel process, with the application of heat. In a third step, there is applied on to the second repairing layer a liquid impreg­nated agent which penetrates into any voids present in the second layer and is solidified by a sol-gel process, with the application of heat.