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Precision piece part watch surface chromium base alloy carbides cladding process method

A technology of precision parts and chromium-based alloys, applied in solid-state diffusion coating, metal material coating process, coating and other directions, can solve the problems of changes in the material properties of parts, the influence of carbon content, and the lack of carbon on the surface, to achieve high resistance High temperature performance, short chromizing time, uniform distribution effect

Active Publication Date: 2008-05-21
QINGDAO CHOHO IND CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Due to the poor flexibility of high-carbon steel parts, parts in many fields, such as the pin shafts of automobile engine chains, require good flexibility. High-carbon steel is not suitable for use, and only medium-carbon alloy steel with better flexibility can be used.
Using the known chromizing technology to treat medium and low carbon alloy steel parts, the obtained chromium-based alloy carbide coating has thin thickness and poor adhesion, which cannot achieve the desired effect
In addition, chromizing treatment consumes part of the carbon on the surface of carbon steel parts, which will affect the carbon content inside the material of the part, thereby changing the material performance of the part
At the same time, due to the influence of time, climate, environment and other factors during the storage, transportation and processing of carbon steel materials, even high carbon steel materials will appear carbon-poor on the surface, which will also affect the chromizing treatment to a certain extent Effect

Method used

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Embodiment

[0010] The method for treating the chromium-based alloy carbide coating on the surface of precision parts in this embodiment is to carry out surface treatment on the pin shaft of the chain during the manufacturing process of the engine chain of the motor vehicle. In order to adapt to the condition that the chain is in a high-speed transmission state when the engine is working, the chain is made of medium-carbon alloy steel with good flexibility, and the treatment method of chromium-based alloy carbide on its surface is carried out according to the following steps:

[0011] The first step: carbon replenishment treatment on the surface of the pin shaft parts: ①Furnace loading: put the machined pin shaft into the carburizing reaction furnace; ②Heating: heat up to 930°C and keep it warm for 45 minutes; ③Add infiltration agent: heat At the same time, add infiltration agent into the furnace, propane at 3.5L / min, methanol at 4.5ml / min; ④Quenching: Add quenching oil evenly and continuo...

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Abstract

The invention discloses a treatment method of a chromium base alloy carbide coating on a precise part surface, and is applicable for the surface treatment of medium-low carbon alloy steel parts and car-poor surfaced carbon steel parts. First, the carbon addition treatment is conducted on a carbon steel part, which is just mechanically processed, and then the chromizing treatment is conducted on a carbon-rich surfaced carbon steel part. The chromizing time is short, but the efficiency is high. A chromium base alloy carbide coating on the part surface is provided with the strong adhesive force and is evenly distributed. Moreover, no unfavorable effect is caused to carbon steel texture. The surface of the treated part is provided with the high hardness, the high abrasion resistance, the high corrosion resistance, and the high high-temperature resistance.

Description

technical field [0001] The invention belongs to a method for surface treatment of metal parts, in particular to a method for treating a chromium-based alloy carbide coating on the surface of a carbon steel precision small part. Background technique [0002] In order to improve the hardness of the surface of carbon steel precision parts, increase the wear resistance, corrosion resistance and high temperature resistance of the parts, the surface high temperature chromizing process is adopted to obtain a certain thickness of chromium-based alloy carbide coating on the surface of the parts. The known treatment method of chromium-based alloy carbide coating on the surface of carbon steel parts is to mix the machined carbon steel parts and chromizing agent evenly according to a certain proportion, then put them into the reaction furnace, heat them to the reaction temperature, and keep them at high temperature for a certain period of time. , The chromizing agent interacts with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23C8/22C21D1/18C23C10/32
Inventor 金玉谟付振明金丽善
Owner QINGDAO CHOHO IND CO LTD
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