Anti-carburizing material and preparation method thereof

Abstract

The invention discloses an anti-carburizing material comprising the following components: by mass percentage, 81.5-86.5% of iron powder; 13.0-18.0% of copper powder; and 0.5% or less of graphite powder. A preparation method of the anti-carburizing material comprises the following steps: 1) material weighing; 2) even mixing of the iron powder, the graphite powder and a lubricant; 3) iron-based blank pressing; 4) copper powder piece pressing; and 5) sintering, to be more specific, a copper powder piece is put on an iron-based blank, then put into a sintering furnace, and is sintered at a temperature of 1090 to 1140 DEG C for 20-50min to obtain the anti-carburizing material. The anti-carburizing material can effectively enable a position which may not expect to be carburized to achieve an antiseepage effect, and may not affect the hardness of the position which may not expect to be carburized; the workpiece apparent hardness is not greater than workpiece heat treatment hardness of a non-carburizing atmosphere; after workpiece carburizing treatment, operation for removal of the antiseepage coating or oxidation skins is not needed, the labor intensity is greatly reduced, the production efficiency is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to an anti-seepage material, in particular to an anti-carburization material and a preparation method thereof. Background technique [0002] Many mechanical parts have complex structures (such as splines, threads, and gears in the gear shaft), and the surface needs to be carburized, but some parts (such as threads) cannot be carburized. It is hoped to maintain the original quenched and tempered or normalized state. Otherwise, it will affect the performance (such as brittle fracture), resulting in unpredictable function decline or loss. Therefore, protection is required, and anti-carburization protection treatment is performed on these parts that do not want to be carburized. [0003] At present, most of the anti-carburization treatment is to coat the anti-carburization coating on the parts that do not want to be carburized. Carburizing and quenching is carried out, and finally the paint on the surface needs to be removed. The a...

AI Technical Summary

Problems solved by technology

[0004] 1. The anti-carburizing coating is unevenly applied, especially when the parts that do not want to be carburized have complex shapes and small gaps (such as threads), it often results in failure to treat the parts that do not want to be carburized. Effective protection; if too much anti-carburization coating is applied, it will be difficult to remove after heat treatment; if too little anti-carburization coating is applied, it will be easy to prevent carburization effectively, so the protected part (the part that does not want to be carburized) It will be carburized to varying degrees, which will easily cause brittle cracks in this part during later use, and then make the whole part invalid;

[0005] 2. It is easy to cause the surface hardness of the parts that do not want to be carburized after heat treatment to be high, which is about 10HRC higher than that before heat treatment, sometimes up to 50HRC;

[0006] 3. After heat treatment, the anti-carburization coating must be removed

If the anti-carburization coating is not effectively removed, the depression will remain, and the use size of the depression cannot be ensured, the yield rate will be low, and the removal of the anti-carburization coating will increase the processing cost

[0007] 4. Sometimes it is necessary to apply the anti-carburization coating manually, which is less efficient

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