Novel treatment method for chromium-base alloy carbide coating on surface of precision part

Abstract

The invention discloses a novel treatment method for a chromium-base alloy carbide coating on the surface of a precision part. The novel treatment method comprises the following steps: putting the part and a chromizing agent into an inner furnace pipe according to a design ratio, sealing, putting the sealed inner furnace pipe into an outer furnace pipe, adjusting an angle between an opening of the outer furnace pipe and a horizontal direction to be 40-60 degrees, starting a motor for driving the inner and outer furnace pipes to rotate, heating to a reaction temperature of 1000 DEG C in a rotating process, and insulating for 6 hours; continuously rotating the inner and outer furnace pipes, stopping insulating, cooling, stopping rotation of the inner and outer furnace pipes when cooling to 500 DEG C, continuously cooling, taking out the inner furnace pipe until cooling to 100 DEG C, carrying out air cooling to achieve normal temperature, opening a cover of the inner furnace pipe, pouring out the part and the chromizing agent, and separating the part from the chromizing agent. A chromizing layer on the surface of the obtained part is very uniform; the chromizing agent is effectively prevented from being caked; the chromizing agent can be repeatedly used in a re-chromizing process, so that the waste and the production cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of surface heat treatment of metal parts, and in particular relates to a new method for treating a chromium-based alloy carbide coating on the surface of small carbon steel precision parts. Background technique [0002] The existing surface chromizing heat treatment process of carbon steel parts is to manually mix the carbon steel parts and chromizing agent according to a certain proportion, then install the furnace, seal, and heat to the reaction temperature. During the heating process, the carbon steel parts and chromizing agent In a static state without stirring, keep it at a high temperature for a certain period of time, the chromizing agent will interact with the carbon in the parts, and form a certain thickness of chromizing layer on the surface of the parts. During the chromizing process, the parts and the chromizing agent are in a state of rest without stirring. The chromizing layer is uneven, the ch...

AI Technical Summary

Problems solved by technology

[0002] The existing surface chromizing heat treatment process of carbon steel parts is to manually mix the carbon steel parts and chromizing agent according to a certain proportion, then install the furnace, seal, and heat to the reaction temperature. During the heating process, the carbon steel parts and chromizing agent In a static state without stirring, keep it at a high temperature for a certain period of time, the chromizing agent will interact with the carbon in the parts, and form a certain thickness of chromizing layer on the surface of the parts. During the chromizing process, the parts and the chromizing agent are in a state of rest without stirring. The chromizing layer is uneven, the chromizing agent is easy to stick to the surface of the part, it is difficult to remove it, and the chromizing agent is easy to agglomerate, and the agglomerating agent cannot be reused when chromizing again, causing a lot of waste