Influence mechanism of added low-melting glass powder on the properties of high-temperature organic composite coatings

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-10-01 DOI:10.1016/j.ceramint.2024.09.430

Tongjun Zhao , Shasha Yang , Zehao Chen , Yao Du , Jinlong Wang , Minghui Chen , Shenglong Zhu , Fuhui Wang

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Abstract

Two formulations of high-temperature organic composite coatings containing Al flakes, nano-TiO₂ were designed and low-melting glass (LMG) powder was added to the second for comparison. The properties of two coatings before and after the heat exposure tests were investigated. At room temperature, the large particles of LMG powder shortened the diffusion path of corrosive medium and had low interface binding strength with Al flakes, which has a negative effect on the barrier properties and strength of the as-prepared coating. After exposed to 600 °C for 300 h, the binder—silicone-modified acrylic resin—decomposed into silica, releasing gaseous products and generating a large amount of cavities inside the coating. Barrier properties and strength of the coating without added LMG powder severely deteriorated. At high temperatures, LMG in the viscous flow state infiltrated into the surrounding cavities by capillary action, forming a glass network and leaving in-situ holes. These holes deteriorated the barrier properties of the coating. The glass network filled in the cavities increased the coating strength and had a barrier effect on the diffusion of corrosive medium.

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添加低熔点玻璃粉对高温有机复合涂层性能的影响机理

设计了两种含有铝薄片和纳米二氧化钛的高温有机复合涂层配方，并在第二种配方中加入低熔点玻璃（LMG）粉末进行比较。研究了两种涂层在热暴露试验前后的性能。室温下，大颗粒 LMG 粉末缩短了腐蚀介质的扩散路径，与铝薄片的界面结合强度低，对制备涂层的阻隔性能和强度有负面影响。在 600 °C 下暴露 300 小时后，粘结剂--硅改性丙烯酸树脂--分解成二氧化硅，释放出气态产物并在涂层内部产生大量空穴。未添加 LMG 粉末的涂层的阻隔性能和强度严重下降。在高温下，处于粘流状态的 LMG 通过毛细作用渗入周围的空腔，形成玻璃网络，并在原位留下孔洞。这些孔洞恶化了涂层的阻隔性能。填充在空腔中的玻璃网络提高了涂层强度，并对腐蚀介质的扩散起到了阻隔作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.