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PCVD surface treating method for aluminum alloy hollow tube extrusion mold

An extrusion die and surface treatment technology, applied in the field of plasma surface modification, can solve the problems of increased residual stress, increased PCVD hard film defects, decreased hardness and bonding force, etc., to reduce defects, improve hardness, prevent The effect of cracking or peeling

Active Publication Date: 2015-12-02
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 treating method for an aluminum alloy hollow tube extrusion mold. The PCVD surface treating method comprises the step of sequentially coating 2 to 5 layers of overlapped films on an aluminum alloy hollow tube extrusion mold body, subjected to heat treatment, at a preset position, wherein the material of each layer of the films is one of independent titanium nitride, titanium carbide, titanium carbonitride, aluminum oxide and titanium-silicon nitride. The aluminum alloy hollow tube extrusion mold treated according to the surface treating method has the advantage that the service life is 1 to 10 times of that of an aluminum alloy hollow tube extrusion mold suffered to traditional nitrizing surface treatment, that is, the service life of the extrusion mold is greatly prolonged.

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 Applications(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