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A kind of pcvd surface treatment method of aluminum alloy hollow tube extrusion die

An extrusion die and surface treatment technology, applied in the field of plasma surface modification, can solve the problems of decreased hardness and bonding force, increased residual stress, and increased defects of PCVD hard film, so as to prevent fracture or peeling and reduce defects , Improve the effect of hardness

Active Publication Date: 2018-02-06
SHANGYU HONGEN PRECISION MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PCVD hard films are mostly ceramic materials, and their thickness is usually only a few microns, while the substrate is generally metal or alloy. The hardness, elastic modulus and thermal expansion coefficient of the two are far apart, and the lattice types are also different. Increase the number of defects in the PCVD hard film, increase the residual stress, and decrease the hardness and bonding force

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Use the following steps to carry out surface treatment on the aluminum alloy hollow tube extrusion die made of hot work die steel H13 material:

[0041] (1) Carry out heat treatment to the extrusion mold: the quenching temperature is 1120°C, the tempering temperature is 550°C (HRC=52~54), and then degreasing, polishing and dehydration are carried out;

[0042] (2) TiN, TiC, TiCN, and TiSiN are coated sequentially by PCVD, and the thicknesses of each coating are 0.5 μm, 5 μm, 1 μm, and 1.5 μm, respectively.

[0043] The extrusion die with the above surface treatment can produce 6 tons of aluminum alloy hollow tubes during its normal service life, and the hardness of the coating film is Hv2900.

Embodiment 2

[0045] Use the following steps to carry out surface treatment on the aluminum alloy hollow tube extrusion die made of hot work die steel H13 material:

[0046] (1) Carry out heat treatment to the extrusion mold: the quenching temperature is 1120°C, the tempering temperature is 550°C (HRC=52~54), and then degreasing, polishing and dehydration are carried out;

[0047] (2) TiC, TiN, TiCN, and TiSiN are coated sequentially by PCVD, and the thicknesses of each layer of coating are 0.5 μm, 5 μm, 1 μm, and 1.5 μm, respectively.

[0048] The extrusion die with the above surface treatment can produce 5.3 tons of aluminum alloy hollow tubes during its normal service life, and the hardness of the coating film is Hv2900.

Embodiment 3

[0050] Use the following steps to carry out surface treatment on the aluminum alloy hollow tube extrusion die made of hot work die steel H13 material:

[0051] (1) Carry out heat treatment to the extrusion mold: the quenching temperature is 1120°C, the tempering temperature is 550°C (HRC=52~54), and then degreasing, polishing and dehydration are carried out;

[0052] (2) TiN and Al are sequentially processed by PCVD 2 o 3 , TiCN, TiSiN coating, the thickness of each layer of coating is 0.5μm, 5μm, 1μm, 1.5μm.

[0053] The extrusion die with the above surface treatment can produce 5.1 tons of aluminum alloy hollow tubes during its normal service life, and the hardness of the coating film is Hv2800.

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Abstract

The invention discloses a PCVD surface treatment method for an aluminum alloy hollow tube extrusion die, which comprises: coating the aluminum alloy hollow tube extrusion die by PCVD at a predetermined position after heat treatment, and the coating film is 2 to 5 layers covered sequentially , the coating material of each layer is one of independent titanium nitride, titanium carbide, titanium carbonitride, aluminum oxide, and silicon nitride titanium. The service life of the aluminum alloy hollow tube extrusion die treated by the surface treatment method of the present invention is 1 to 10 times that of the aluminum alloy hollow tube extrusion die treated by the traditional nitriding surface, which greatly prolongs the service life of the extrusion die .

Description

technical field [0001] The invention relates to the field of plasma surface modification, in particular to a PCVD surface treatment method for an aluminum alloy hollow tube extrusion die. Background technique [0002] Micro-channel porous tubes, especially aluminum alloy hollow tubes are the main parts of heat exchangers, and are the best products to replace the original copper tubes. They have good heat dissipation effect, low cost and high output, and are widely used in automobile air conditioners and household air conditioners. , central air conditioning, refrigerator heat exchanger, etc. [0003] Micro-channel perforated tube extrusion die is the key process equipment for aluminum alloy hollow tube forming. The aluminum alloy extrusion die is a die with very bad working conditions, which is mainly manifested in three aspects: (1) The working environment temperature is high (450 ° C ~ 500 ° C) and it is in a high temperature state for a long time. Just H13 can't withsta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/34C23C16/32C23C16/36C23C16/44
Inventor 倪柏钢倪宏恩陶狄锋严岳峰
Owner SHANGYU HONGEN PRECISION MACHINERY