Process for manufacturing hard alloy coating

Abstract

The invention discloses a process for manufacturing a hard alloy coating, which comprises the following steps of: 1) coarsening the surface of a workpiece basal body; 2) preheating the workpiece basal body, namely heating the workpiece basal body through electromagnetic induction, wherein the power of a power supply is 60 to 100 kw, the frequency is 2,000 to 10,000 Hz, an induction heater has 1 to 10 turns of coils, the temperature is between 150 and 360 DEG C after heating for 10 to 30 minutes; 3) spraying the hard alloy coating, namely spraying the hard alloy coating on the workpiece basal body, wherein the oxygen pressure is 0.1 to 0.5 MPa, the acetylene pressure is 0.01 to 0.05 MPa, the spraying distance is 150 to 230 mm, and the spraying temperature is between 250 and 300 DEG C; and 4) performing remelting, namely heating up a workpiece through the electromagnetic induction, wherein the power of the power supply is 60 to 100 kw, the frequency of the power supply is 2,000 to 10,000 Hz, the induction heater has 1 to 10 turns of the oils, and the workpiece is heated to the temperature of between 900 and 1,150 DEG C. By the process for manufacturing the hard alloy coating, a compact, high-hardness, high-abrasion and corrosion resistant hard alloy coating can be formed.

Description

technical field [0001] The invention relates to the technical field of surface engineering, in particular to a manufacturing process of a cemented carbide coating. Background technique [0002] At present, the method of adding cemented carbide coating on the workpiece substrate is: heating and melting the cemented carbide material with flame to combine it with the workpiece substrate. The disadvantages of this method are: 1. The metallurgical reaction of the cemented carbide material is not complete enough during the heating process, resulting in lower hardness and poor wear resistance of the coating; 2. The intensity of the heating flame is not easy to control, which may easily cause overburning or insufficient heating ; 3. The quality and reliability of the coating is poor, and the yield is difficult to guarantee; 4. The cobalt-based alloy has a high melting point and is not easy to form a spray welding layer; 5. The iron-based alloy is prone to oxidation when flame remelt...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: 1. The metallurgical reaction of the cemented carbide material is not complete enough during the heating process, resulting in lower hardness and poor wear resistance of the coating; 2. The intensity of the heating flame is not easy to control, which may easily cause overburning or insufficient heating ; 3. The quality and reliability of the coating is poor, and the yield is difficult to guarantee; 4. The cobalt-based alloy has a high melting point and is not easy to form a spray welding layer; 5. The iron-based alloy is prone to oxidation when flame remelting is used, and the coating quality is difficult to guarantee; 6. High production costs, low production efficiency, poor operating environment for operators, and high labor intensity; 7. Low degree of automation, and it is difficult to guarantee the repeatability of qualified product manufacturing

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