Add A Bearing Layer Between The Hard Coating And The Die

Add a bearing layer between the hard coating and the die

▲ Figure 5 The fracture hardness gradient curve of the hard coating deposited after nitriding on the mold

The hardness of the die after heat treatment Hv 2000, and the thickness is usually <5μm. The surface of heavy-duty die is coated with a thin, hard hard coating, which is easy to collapse and collapse under heavy load. Therefore, it is required to nitride on the surface of the mold before depositing hard coating, hoping that the hardness of the surface will be reduced slowly.

FIG. 5 shows the fracture hardness gradient curve of the hard coating deposited after nitriding on the die. The vertical axis is hardness and the horizontal axis is depth. The left figure is the hardness gradient curve of the nitriding layer. The graph in the middle is a hardness gradient curve for the deposition of TiN only. The figure on the right shows the fracture hardness gradient curve of the hard coating deposited after low-temperature nitriding on the die. It can be seen that the hardness gradient decreases slowly, which is conducive to bearing heavy load impact.

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