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A hot extrusion die permeation-plating compound surface strengthening method

A technology of hot extrusion die and composite surface, applied in arc ion plating CrAlN coating composite strengthening design and process realization, hot extrusion die plating compound surface strengthening, gas nitriding layer, hot extrusion die surface strengthening application fields , which can solve the problems that the first two processes cannot be combined and applied, and achieve the effect of better strengthening effect, satisfying wear resistance and increasing coating thickness.

Inactive Publication Date: 2017-04-26
XI AN JIAOTONG UNIV
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Problems solved by technology

Based on the progress of the above-mentioned single surface technology, many researchers have paid special attention to the surface strengthening of hot extrusion dies under complex and harsh conditions by the combined technology of infiltration and plating. The former two processes cannot be combined and applied simply, and a new permeation-plating composite optimization process must be developed in order to achieve better application results

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  • A hot extrusion die permeation-plating compound surface strengthening method

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Embodiment

[0047] This embodiment provides a kind of process method of preparing the permeation-plating composite layer on the surface of the aluminum profile hot extrusion die and the sample block made of H13 material. It should be noted that the permeation-plating composite layer prepared by the method of the present invention can be used in Any type of hot extrusion die and workpiece made of H13 material is not limited to this embodiment.

[0048] The concrete preparation process of this embodiment is:

[0049] 1) The hot extrusion die and sample block made of H13 material with hardness HRC=43 after quenching at 1070°C + tempering at 530°C for three times (H13 material composition: 4Cr5MoV1Si, mold size: φ260×80mm, sample block size : φ30×10mm) as a sample, after surface degreasing and polishing, immerse in acetone for ultrasonic cleaning, and alcohol dehydration.

[0050] 2) Put the pretreated sample into the gas nitriding furnace for nitriding treatment. The nitriding equipment inc...

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Abstract

The invention discloses a method for reinforcing a surface of a hot-extrusion die through cementation compounding. The method comprises the following steps: polishing and cleaning the surface of a die subjected to nitriding treatment, and performing CrAlN coating processing in arc ion plating equipment; with a rectangular Ti target as a Ti source of a bottom layer and a transition layer, controlling the sputtering rate of the rectangular Ti target through the current of the arc power of the rectangular target; with a circular CrAl target as the Cr and Al element source of a CrAlN coating, controlling the sputtering rate of the circular CrAl target through the current of the arc power of the circular CrAl target; ionizing high-purity Ar and N2 so as to be combined with Cr and Al elements, and depositing on the nitriding layer of the die to form the CrAlN coating. The method disclosed by the invention is applicable to the field of hot-extrusion dies in high-temperature and heavy-load harsh service conditions.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and relates to a composite strengthening design and process realization method of a gas nitriding layer of H13 material and an arc ion plating CrAlN coating. It specifically relates to a hot extrusion die permeation-plating composite surface strengthening method, which is particularly suitable for the application of hot extrusion die surface strengthening under severe service conditions such as high temperature and heavy load. Background technique [0002] The hot extrusion die made of H13 material is a kind of material forming process equipment in a severe service environment such as high temperature (400-600°C) and heavy load (200-300MPa). During use, the surface of the die will often suffer from wear, thermal fatigue, Oxidation, plastic deformation or even fracture and other failures. Therefore, using various surface strengthening methods to improve the bearing capacity of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/32C23C14/16C23C8/24C23C28/00
Inventor 马胜利
Owner XI AN JIAOTONG UNIV
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