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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

Active Publication Date: 2008-05-14
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In addition, because the existing thermal spraying process uses powdered spraying materials, due to the uneven and continuous powder feeding to the combustion chamber, the powder is in the combustion chamber, and the melting degree of the powder is different due to the different temperatures of each point, especially the powder in the combustion chamber. Insufficient residence time to allow all powder to fully melt before being sprayed onto the substrate by high pressure air
Therefore, the bonding strength between the particles and the matrix and between the particles cannot be guaranteed, and the waste of powder is also serious
At the same time, the components added are complex and have different properties, and it is difficult to make a powder with uniform composition and suitable particle size range.

Method used

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  • Multi-component rod for hot spraying wearable sealing coating and preparation method thereof

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Experimental program
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Effect test

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. Accompanying drawing 1 is the flow chart of processing process.

[0022] The same effect can also be achieved...

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, uniformly adding binder polyvinylpyrrolidone (PVA) ethanol solution, hydraulic press, drying after forming to prepare hot 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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Abstract

The invention relates to a multi-components bar applied to a hot spray wearable sealing coating and a preparation method thereof. A bar which is good in spraying technology adaptability is prepared through a method of mechanical milling, bonding at room temperature and squeezing. The bar comprises Ni, Si, Cu, Al, Cd, BN, C and oxides, binders and other materials. The raw materials can be simple substance powder or alloy or compound, and the oxides can be one kind or more or the combination of a few materials. The binder can be inorganic materials and can also be organic substances, and the combination of some additives and addition agents is also included. The coating prepared by the bar has the advantages that: the coating combines well with a matrix, the wearable performance is excellent, and the thermal shock resistance and salt-fog resistance are excellent. The bar has wide application range and can be applied to the surface modification and the reproduction of mechanical equipments.

Description

【Technical field】 [0001] The invention relates to the field of thermal spraying materials, in particular to a multi-component rod for thermal spraying abradable sealing coating and a preparation method thereof. 【Background technique】 [0002] In order to improve engine efficiency and reduce fuel consumption, gas path sealing technology is an important means. The abradable sealing coating is widely used because of its simple process, easy repair and adjustment performance, and good sealing effect. Most of the abradable sealing coating materials at home and abroad are composed of a certain proportion of metal phase and non-metallic composite materials with self-lubricating effect. Metals are anti-corrosion, anti-oxidation, to ensure the strength of the coating itself and the bonding strength with the substrate, the commonly used metal phases are nickel, aluminum, copper and their alloys, etc.; Non-metallic phases include graphite, hexagonal boron nitride, molybdenum disulfid...

Claims

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Application Information

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IPC IPC(8): C23C4/06B22F9/04B22F3/02
Inventor 于月光马江虹薛文涛田晔
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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