Hydrophilic dual-effect array coating capable of promoting aluminum melt spreading and preparation method thereof

A technology of aluminum melt and aluminum coating, which is applied in coating, metal material coating process, melt spraying and other directions to achieve the effects of improving film formation and interface heat exchange, improving film formation rate, and expanding the scope of spreading

Active Publication Date: 2022-07-19
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on liquid film flow of high-temperature melts is still in its infancy, and its excessively high surface tension is still the key to restricting the formation of thin-walled castings, the preparation of semi-solid slurries, and the regulation of interface behavior of metal melts.

Method used

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  • Hydrophilic dual-effect array coating capable of promoting aluminum melt spreading and preparation method thereof
  • Hydrophilic dual-effect array coating capable of promoting aluminum melt spreading and preparation method thereof
  • Hydrophilic dual-effect array coating capable of promoting aluminum melt spreading and preparation method thereof

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preparation example Construction

[0026] The preparation method of the hydrophilic-phobic dual-effect array coating that can promote the spreading of aluminum melt provided by the present invention, see figure 1 shown, including the following steps:

[0027] choose a base;

[0028] modifying a 2mm thick aluminophilic liquid coating on the substrate;

[0029] A 2mm thick aluminum layer is deposited on the aluminophilic liquid coating as a sacrificial template;

[0030] A 2mm thick aluminum-repellent liquid coating is decorated on the sacrificial template; in order to ensure the regular distribution of the aluminum-repellent coating, the aluminum-repellent liquid coating is composed of an array of aluminum-repellent coating units;

[0031] Then, the sacrificial template is etched to expose a part of the aluminum-philic liquid coating on the upper layer of the substrate, that is, the dual-effect array coating of hydrophilic and phobic effect is obtained on the substrate.

Embodiment 1

[0033] A preparation method of a hydrophilic-phobic dual-effect array coating that can promote the spreading of aluminum melt, comprising the following steps:

[0034] Firstly, 304 stainless steel plate is selected as the substrate, and the chrome-plated coating on the surface of the substrate is modified by plasma spraying as the aluminum-philic liquid coating. Coating method to modify 2mm thick TiO 2 The coating is used as aluminophobic liquid coating, and the modified aluminophobic liquid coating is composed of aluminophobic coating units arranged in an array; the shape of each aluminophobic coating unit is an isosceles triangle with an apex angle of 60°, The distribution spacing of each triangle is 6mm, and finally the etching template exposes part of the chrome coating on the upper layer of the substrate to obtain chrome-TiO 2 Philophilic aluminum dual-effect array coating.

Embodiment 2

[0036] A preparation method of a hydrophilic-phobic dual-effect array coating that can promote the spreading of aluminum melt, comprising the following steps: firstly, a 304 stainless steel plate is selected as a substrate, and a chrome-plated coating is modified on the surface of the substrate by a plasma spraying method as an aluminum-philic liquid coating, After completion, a 2mm-thick aluminum layer was deposited on the aluminophilic liquid coating as a sacrificial template, and then the 2mm-thick TiO was modified by direct coating. 2 The coating is used as aluminophobic liquid coating, and the modified aluminophobic liquid coating is composed of aluminophobic coating units arranged in an array; the shape of each aluminophobic coating unit is an isosceles triangle with an apex angle of 30°, The distribution spacing of each triangle is 5mm, and finally, the template is etched to expose part of the chrome coating on the upper layer of the substrate to obtain chrome-TiO 2 Phi...

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Abstract

The invention discloses a hydrophilic-phobic dual-effect array coating capable of promoting aluminum melt spreading and a preparation method thereof, and relates to the technical field of metal material processing. The preparation method includes the following steps: providing a substrate; modifying aluminophilic liquid coating on the substrate; depositing a sacrificial template on the aluminophilic liquid coating; modifying the aluminophobic liquid coating on the sacrificial template; The aluminum-repellent liquid coating is composed of aluminophobic coating units arranged in an array; after etching the sacrificial template, a part of the aluminum-philic liquid coating on the upper layer of the substrate is exposed, that is, the dual-effect array is obtained on the substrate. coating. The invention destroys the continuity of the solid-liquid three-phase contact line, reduces the hysteresis of the contact angle, promotes the spreading of the aluminum melt, and improves the film forming rate by constructing a hydrophilic and phobic interphase structure on the heat exchange wall surface.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a dual-effect array coating of affinity and phobia that can promote the spreading of aluminum melt and a preparation method thereof. Background technique [0002] The problems of dynamic wetting and interfacial heat transfer at the liquid-solid interface of metal melt widely exist in metallurgy and casting processes. They have an important impact on metal filling, heat transfer, mass transfer, and crystallization, and determine process stability and product organization. and performance. Compared with adjusting the fluidity of the melt itself, from the perspective of interface science and fluid mechanics, by adjusting the surface energy and smoothness of the heat exchange wall at the contact angle with the melt, the film formation rate of the metal melt and the interfacial heat transfer can be effectively optimized. , is a universal and universal high-efficienc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00C23C4/08C23C4/134C23C24/00
CPCC23C28/322C23C28/3455C23C28/40C23C4/134C23C4/08C23C24/00
Inventor 张晋白景元张美林杨大龙李晓阳范龙毅杨洲管仁国
Owner DALIAN JIAOTONG UNIVERSITY
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