Metal ceramic die-casting die with tensile prestress and preparation method of metal ceramic die-casting die

A metal-ceramic and die-casting mold technology, applied in the field of tensile prestressed metal-ceramic die-casting mold and its preparation, can solve the problems affecting workpiece quality, output, short mold life, unsatisfactory thermal deformation resistance, etc., so as to improve anti-adhesion Performance, mold life improvement, and thermal deformation resistance are not ideally improved.

Inactive Publication Date: 2018-06-01
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects in the above-mentioned prior art, the object of the present invention is to provide a tensile prestressed cermet die-casting mold and a preparation method thereof, by applying tensile prestress to prepare a cermet coating on the surface of the mold base, which can solve the problem of The thermal fatigue resistance, wear resistance, and thermal deformation resistance of existing die-casting molds are not ideal, and the mold life of the mold is short, which affects the technical problems of workpiece quality and output

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  • Metal ceramic die-casting die with tensile prestress and preparation method of metal ceramic die-casting die

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Effect test

Embodiment 1

[0026] see figure 1 , a metal-ceramic die-casting mold with tensile prestress, which is composed of a mold base 1 and a metal-ceramic layer 2 with tensile prestress arranged on the surface thereof. The cermet layer is a ceramic layer with tungsten carbide + tantalum silicide as the main component. Through the thermal adaptation between the mold base and the prepared cermet layer, after the cermet layer is prepared, the ceramic layer has tensile prestress. , the tensile prestress is less than 60% of the thermal expansion strain stress during the heating process, wherein the cermet layer is composed of a metal binder phase and ceramic particles with a particle size of no more than 3um, and the size of the ceramic particles is preferably 0.1-3um. The thickness of the tensile prestressed metal layer is 0.04mm.

[0027] The preparation method of the above-mentioned tensile prestressed cermet die-casting mold comprises the following steps:

[0028] 1) Use 400#, 600#, 1000# sandpap...

Embodiment 2

[0031] A cermet die-casting mold with tensile prestress is composed of a mold base 1 and a cermet layer 2 with tensile prestress arranged on the surface thereof. The cermet layer is a ceramic layer with tungsten carbide + tantalum silicide as the main component. Through the thermal adaptation between the mold base and the prepared cermet layer, after the cermet layer is prepared, the ceramic layer has tensile prestress. , the tensile prestress is less than 60% of the thermal expansion strain stress during the heating process, wherein the cermet layer is composed of a metal binder phase and ceramic particles with a particle size of no more than 3um, and the size of the ceramic particles is preferably 0.1-3um. The thickness of the tensile prestressed metal layer is 0.10mm.

[0032] The preparation method of the above-mentioned tensile prestressed cermet die-casting mold comprises the following steps:

[0033] 1) Use 400#, 600#, 1000# sandpaper to remove the oxide on the surface...

Embodiment 3

[0036] A cermet die-casting mold with tensile prestress is composed of a mold base 1 and a cermet layer 2 with tensile prestress arranged on its surface. The cermet layer is a ceramic layer with magnesium oxide + tantalum silicide as the main components, and through the thermal adaptation between the mold base and the prepared cermet layer, after the cermet layer is prepared, the ceramic layer has tensile prestress , the tensile prestress is less than 60% of the thermal expansion strain stress during the heating process, wherein the cermet layer is composed of a metal binder phase and ceramic particles with a particle size of no more than 3um, and the size of the ceramic particles is preferably 0.1-3um. The thickness of the tensile prestressed metal layer is 0.04mm.

[0037] The preparation method of the above-mentioned tensile prestressed cermet die-casting mold comprises the following steps:

[0038] 1) Use 400#, 600#, 1000# sandpaper to remove the oxide on the surface of t...

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Abstract

The invention discloses a metal ceramic die-casting die with tensile prestress and a preparation method of the metal ceramic die-casting die and belongs to the technical field of coating preparation.The metal ceramic die-casting die comprises a die base and a metal ceramic layer which is arranged on the surface of the die base and has tensile prestress. By means of thermal adaptation between thedie base and the prepared metal ceramic layer, the metal ceramic layer has the tensile prestress after being prepared, and the metal ceramic layer and the die base are metallurgically or mechanicallybonded. Preparation of the metal ceramic layer with the tensile prestress comprises the following steps: a, removing an oxidation film from the die base, and performing oil-removal cleaning; b, preparing the metal ceramic coating with the tensile prestress by selecting one of a spray method, a vapor deposition method, a composite coating method, a self-propagating high-temperature synthesis methodand a high-temperature fusion method. With adoption of the coating prepared with the preparation technology, the technical problem that thermal fatigue resistance, wear resistance and heat distortionresistance of the die are not ideal is solved effectively, the service life of the die is prolonged, quality of workpieces is improved, and yield of the workpieces is increased.

Description

technical field [0001] The invention belongs to the technical field of coating preparation, and in particular relates to a tensile prestressed cermet die-casting mold and a preparation method thereof. Background technique [0002] Due to the high local temperature of the mold surface during the manufacturing process of the die-casting mold, the alloy adheres to the mold and cannot be taken out when the mold is released, and a layer of alloy adheres to the surface of the mold, resulting in rough, rough and uneven surface of the die-casting product. Uneven surface defect of a casting. In the past, the anti-adhesion performance was improved by uniformly brushing anti-stick wax or nitriding on the surface of the mold cavity to obtain a nitriding layer. The anti-stick wax not only increases the process, but also affects the output and cannot guarantee the quality. Since the nitrided layer is easy to fall off and brittle, the structure is not dense enough and the permeated layer i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 杨冠军宋忠孝朱晓东李雁淮钱旦孔文
Owner XI AN JIAOTONG UNIV
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