A graphite source for glow-free hydrocarburization

Abstract

The invention discloses a graphite source electrode for glow carburizing without hydrogen. The graphite source electrode comprises an external graphite cover body and an internal graphite cover body which are arranged in parallel, the internal and external graphite cover bodies are cube-shaped generally, the same sides of the external graphite cover body and the internal graphite cover body are provided with a temperature-measuring ventilation hole respectively; needle-like graphite source electrodes are uniformly distributed at the upper and lower parts of the internal graphite cover body, and a graphite clamp for clamping a workpiece is provided in the internal graphite cover body and suspends the workpiece horizontally between needle-like graphite source electrodes which are evenly distributed at the upper and lower parts; metallic cover body is arranged outside the external graphite cover body and one side of the metallic cover body is provided with a temperature-measuring ventilation hole. When a pure-titanium workpiece is subjected to glow carburizing without hydrogen by means of the graphite source electrode disclosed by the invention, the sputtering rate of carbon can be increased by more than 26 times, and the carburizing layer is uniform and dense, the carburizing time is effectively shortened, the carburizing temperature is reduced and the carburizing efficiency is increased.

Description

technical field [0001] The invention relates to the technical field of hydrogen-free carburizing, in particular to a graphite source for glow-free hydrogen carburizing. Background technique [0002] At present, in the glow ion hydrogen-free carburizing process, in addition to process parameters such as processing temperature and time, the structure and form of the graphite source and the layout position of the workpiece in the source also have a greater impact on the carburizing effect. The commonly used glow discharge electrode structures are flat plate, cave and deep well. Although they all use the hollow cathode glow discharge phenomenon, the sputtering output of carbon is limited, the carbon concentration around the workpiece is not high, and the carburization efficiency is not high. . [0003] There are two ways to place the workpiece: flat and suspended, but for glow-free hydrogen carburizing, it is difficult to obtain a comprehensive and uniform carburized layer on t...

AI Technical Summary

Problems solved by technology

Commonly used glow discharge electrode structures are flat plate, cave and deep well. Although they all use the hollow cathode glow discharge phenomenon, the sputtering output of carbon is limited, the carbon concentration around the workpiece is not high, and the carburization efficiency is not high.

[0003] There are two ways to place the workpiece: flat and suspended, but for glow-free hydrogen carburizing, it is difficult to obtain a comprehensive and uniform carburized layer on the workpiece

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