Multi-component rod for hot spraying wearable sealing coating and preparation method thereof
A sealing coating, thermal spraying technology, applied in coating, metal material coating process, fusion spraying and other directions, can solve the problem of difficult powder with uniform composition, suitable particle size range, different melting degree of powder, and inability to guarantee bonding strength. and other problems, to achieve the effect of easy control of the production process, short production process flow and moderate coating hardness
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Embodiment 1
[0021] Use Al, C elemental powder, Ni, Si alloy or elemental powder, Si oxide or other salts as raw materials, and BN in a certain proportion, among which C, 3.0%; Al, 3.0%; Si, 8.0%; BN , 8.0%; the rest is Ni. The above-mentioned various raw materials are mixed by mechanical ball milling, and aluminum dihydrogen phosphate is added after they are uniform, and water can also be added for mixing (or ball milling and mixing at the same time). The binder ratio is 25.0% of the powder, and the ratios are weight ratios. . It is pressed (25MPa) on a hydraulic press, placed in a tray after forming, and the temperature rise rate is automatically controlled by a program temperature controller. When the temperature is raised to 100-200°C and kept at a constant temperature for a period of time (3 hours), the components in the binder will volatilize and the rod will be densified. attached figure 1 A flow chart of the machining process.
[0022] The same effect can also be achieved if si...
Embodiment 2
[0025] Use Ni, Cu elemental powder or alloy, C elemental powder Si oxide or other salts, and BN as raw materials, and mix them by mechanical ball milling according to a certain proportion, of which C, 8.0%; Cu, 20%; BN, 7.0%; Si, 4.5% %, the rest is Ni. After mixing evenly, add a silicate aqueous solution as a binder, press on a hydraulic press, and dry after forming. Get rods.
[0026] The same effect can also be achieved if phosphate or organic matter is used instead of silicate as the binder.
[0027]Flame spraying sealing coating, under certain spraying parameters, superalloy as the base material, experiments show that the hardness of the coating is 8-14HB, no cracks occur on the coating surface, and it has good wearability and salt resistance Fog corrosion performance, high tensile strength. The hardness of the coating after heat treatment at 200°C for 100 hours is not greater than 11.0HB, and it can be used as a sealing coating under this temperature condition.
Embodiment 3
[0029] Using Ni, C, BN, Si oxide or salt, CuO, CdO as raw materials, according to a certain ratio of mechanical ball milling, adding the binder polyvinylpyrrolidone (PVA) ethanol solution evenly, pressing with a hydraulic press, drying after forming to prepare hot water Rods for spraying sealing coating.
[0030] If the polyvinylpyrrolidone ethanol solution is replaced with an inorganic binder or other organic matter as a binder, the same effect can be achieved.
[0031] The sealing coating is prepared by flame spraying. Under certain spraying parameters, the hardness of the coating is 5 / 62.5 / 30. No significant changes. This material can be used as a sealing coating at 700°C.
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