The powder mixture to obtain metal-ceramic coating |
|
IPC classes for russian patent The powder mixture to obtain metal-ceramic coating (RU 2170714):
C03C8/18 - containing free metals
Mixture for making glaze / 2341471
Proposed mixture for making glaze consists of crushed window and/or container glass, kaolin and titanium slag. The components have the following ratio, in wt %: crushed window and/or container glass 65-75; kaolin 2-4; titanium slag 21-33.
Slip for obtainment of glaze coating / 2346900
Invention can be applied in manufacturing of porcelain and faience goods. Glaze slip includes components at the following ratio, wt %: frit 100.0; clay 0.5-1.5; zircon 4.0-5.0; water 40.0-50.0; silica gel 4.0-5.0; barium carbonate 0.7-1.7; sodium chloride 0.1-0.2; sodium tripolyphosphate 0.1-0.2; calcium borate 3.0-4.0. Frit has the following composition, wt %: SiO2 47.0-50.0; ZrO2 4.0-8.0; B2O3 18.0-22.0; MgO 2.0-4.0; K2O 2.8-3.8; F' 0.1-0.2; TiO2 8.0-10.0; BaO 2.0-4.0; ZnO 4.0-8.0.
Charge for glase production / 2430039
Charge for glase production contains the following components, wt %: broken window sheet and/or container glass 76-82, kaolin 3-4, soda ash 1-2, zircon 8-11, pegmatite 5-8.
Slip for producing glase coating / 2434818
Invention relates to glasing heat resistant ceramic tiles and stove tiles. The slip for obtaining glase coating contains the following in pts.wt: frit 100; clay 4-6; zircon 1-1.5; water 40-50; tin oxide 10-14; chamotte 6-8. The frit is prepared from the following components, pts.wt: clay 2-3; zircon 2-3; tin oxide 10-14; borax 10-14; quartz sand 68-74.
Method of production of electroinsulating glass enamel / 2453514
Frit of the following composition, wt % is melted: SiO2- 20.0-25.0; CaO- 4.5-12.0; SrO-1.0-2.0; CdO- 2.0-3.0; MnO- 0.1-0.5; K2O - 3.0-4.0; Na2O-1.0-1.5; B2O3- 5.0-5.5; CaF2-4.0-5.0; MoO3 - 0.5-0.8; Cr2O3 -0.5-0.8; Co2O3 -0.1-0.5; NiO - 0.1-1.0; Na3AlF6 - 0.1-0.5; BaO is the rest. Melting is carried out at 1150-1200 °C. The obtained product is crushed, and then injected 5-10% SrTiO3 of the frit weight.
|
(57) Abstract: The invention relates to the creation of defenses of Nickel-based alloys from exposure to aggressive environments, in particular to metal-ceramic coatings used to protect structures of power plants. The powder mixture to obtain metal-ceramic coating contains the following components, wt.%: the oxide of barium 12 - 14; boron oxide 6,0 - 6,6; aluminum oxide 8,0 - 8,8; cerium oxide 20,0 - 22,0; zirconium oxide 2,5 - 3,0; Nickel - rest. The technical result of the invention is to provide performance and durability of Ni-base alloys during cyclic exposure to high-speed stream of oxidizing gas containing solid particles, at temperatures up to 750oC. table 2. The invention relates to the field of security of Nickel-based alloys, Nickel-plated against corrosive environments, in particular to the creation of cermet coatings, efficient high-speed flow of a gas - oxidizing agent containing solid particles - the initiators of fire. Know the use for protection against fire glass, glass-ceramic coatings, paleological coating and refractory enamel", M., engineering, 1984, pp. 197 - 210). However, these coatings at a temperature of about 650oC dissolved in the stream of oxidizing gas containing solid particles AMG-6, due to the brittleness and low erosion resistance. In AVT. mon. USSR N 462808, class C 03 C 8/16 described steklometallik floor. The powder mixture to obtain this coating on steel and cast iron consists of the following components, wt. including:Enamel Frit - 100 The powder of the Nickel - 50 - 150 The chromium oxide is 0.1 to 1.2 Bentonite - 2,0 - 6,0 Potash - 0,1 - 0,5 The composition of Frits, wt.%: The oxide of silicon - a total of 8.74 The boron oxide - 15,14 The oxide of barium - of 11.15 The lead oxide - 64,97 The powder mixture of the composition applied as a coating on articles of Nickel alloy, Nickel-plated, heat-resistant only up to 300 - 350oC in conditions of high heat flow of a gas - oxidizing agent in the presence of solid particles. The objective of the invention is the creation of the powder mixture, intended for obtaining ceramic coatings on structures of Nickel alloys, Nickel-plated, working temperature up to 750oC in the gas flow - oxidant containing solid particles is a, oxides of barium and boron also the oxides of aluminum, zirconium and cerium in the following ratio of components, wt.%: The oxide of barium - 12 - 14 The boron oxide - 6,0 - 6,6 Alumina - 8,0 - 8,8 The cerium oxide - 20 - 22 Zirconium oxide - 2,5 - 3,0 Nickel - Rest The technical result - the floor of the offered powder charge deposited on the structure of Nickel alloys, Nickel-plated, protects them from fire in the gas flow of an oxidant at a temperature of 700 - 750oC in the presence of solid particles. To obtain the proposed mixture were taken fine powders of Nickel, oxides of cerium, zirconium, aluminum, barium and boron in the ratio given above. From the prepared mixture prepared in an aqueous slurry, then put it by the method of dipping, spraying or Bay on the design of the alloy based on Nickel, Nickel-plated, depending on the complexity of their configuration. Slip layers are dried at temperatures up to 90oC. Design with the obtained coating is burned in a furnace in a protective gas at a temperature of 1000 - 1100oC. An example of a specific use. To work as samples were taken of the plate 20 x 30 x 1 mm and Ob - 100 microns. According to the recipe prepared the slip and the dipping method was applied to the samples. Dried samples at temperatures up to 90oC. Burned the coated samples in a container filled with argon, at temperatures of 1000, 1050, 1100oC. Evaluated the strength of adhesion of the coating to the substrate, thermal stability and resistance to fire samples blades coated. On the strength of adhesion was judged by the nature of the coating spalling from the blow 0,5 kgs m on impact-testing machine according to GOST 4765-73. Thermally stable believed floor, withstand, without fracture, 10 cycles: 750 20oC (water). Resistance to fire was determined by the method on a special installation in the flow of gaseous oxygen at temperatures up to 750oC when applying particles of alloy AMg6. The compositions of the formulations of the inventive powder charge with minimum, maximum and average values of the content of the source components and the known composition of the mixture is given in table 1. The reduction in the proposed powder mixture to obtain metal-ceramic coating Nickel content below the minimum values leads to embrittlement of the coating, the reduction of boron oxide raises the temperature of the burning, slimming the firing leads to embrittlement and loss of strength. The increase in the content of components, in addition to boron oxide, higher maximum values leads to increased firing temperatures, the decrease in mechanical strength. Increasing the amount of boron oxide leads to an increase in the glass rim, the lower the firing temperature and the strength of adhesion. The firing modes and properties of the coatings are shown in table 2. The analysis presented in table 2 data shows that obtained from charge the coating has high adhesion strength, not salivas from the blow 0,5 kgs m, has a high thermal stability. Samples of this coating can withstand without fire exposure to particles of alloy AMg6 injected into the stream of oxidizing gas to 10 times. Known plating will be damaged from impact with the formation of the chip - breakdown and not workable at a temperature of 750oC, as in the overheated state of low viscosity, easy suwailem gas flow. The offered powder charge on the structures of power plants, of Nickel alloys Nickel layer will ensure their performance and reliability under cyclic exposure to high-speed stream of oxidizing gas, the content of runiceskaja the surface of metal structures, containing Nickel, oxides of barium and boron, characterized in that it further comprises the oxides of cerium, zirconium and aluminum in the following ratio, wt.%: The oxide of barium - 12 - 14 The boron oxide - 6,0 - 6,6 Alumina - 8,0 - 8,8 The cerium oxide - 20,0 - 22,0 Zirconium oxide - 2,5 - 3,0 Nickel - Rest
|