Composite technology of spraying self-fluxing alloy combined with medium frequency induction heating to produce wear-resistant sealing surface of valves

Abstract

The invention belongs to the field of valve sealing face production, and particularly relates to a composite process for producing a valve wear-resistant sealing face by combining self-fluxing alloy spraying with medium-frequency induction heating. According to the composite process, firstly, a thin self-fluxing alloy pre-protection layer is sprayed on the interior of an annular groove of a preprocessed valve sealing face; and then, on the sprayed coating, self-fluxing alloy powder is deposited through powder feeding device feeding and medium-frequency induction heating, and the valve wear-resistant sealing face is formed. The composite process has the beneficial effects of being simple in process, free of deposited metal dilution, high in deposition efficiency, high in deposition speed, low in production cost, high in production efficiency, and the like. When a nickel-based self-fluxing alloy is selected for use, obtained deposited metal is high in hardness and good in scratch resistance and wear resistance, the wear resistance of the valve sealing face can be effectively improved, and therefore the process can be widely used for production of the wear-resistant valve sealing face.

Description

technical field [0001] The invention belongs to the field of valve sealing surface production, and in particular relates to a composite process for producing a wear-resistant sealing surface of a valve by spraying a self-fluxing alloy combined with medium-frequency induction heating. Background technique [0002] Since the reform and opening up, my country's mineral mining, thermal power generation, cement production and other industries have developed steadily, and the demand for valves with good performance such as wear resistance and abrasion resistance has gradually increased. However, due to the fact that the valve sealing surface is often exposed to various hard high-speed dust and particles during operation, and is frequently affected by friction, extrusion and impact during the start-up and closing process, the valve sealing surface is easily damaged, resulting in a longer service life of the valve. It is extremely short, and the loss caused by scrapping due to the d...

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Problems solved by technology

However, the plasma spray welding process also has certain shortcomings, such as high dilution rate of plasma spray welding layer, low hardness, low deposition efficiency, low spray welding efficiency and poor working environment, etc.

The process of bonding wear-resistant rings is very expensive, and the adhesive is easily hollowed out by dust and causes damage to the sealing surface

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