铝颜料形貌对有机硅涂层高温失效行为的影响机制

doi:10.11902/1005.4537.2025.213

中国腐蚀与防护学报 DOI: 10.11902/1005.4537.2025.213

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铝颜料形貌对有机硅涂层高温失效行为的影响机制

赵统君¹,王星尧²,陈泽浩¹,杨莎莎¹,王金龙²,陈明辉¹,朱圣龙³,王福会¹

1. 东北大学
2. 沈阳材料科学国家研究中心东北大学联合研究分部沈阳
3. 中国科学院金属研究所

Influence Mechanism of Aluminum Pigment Morphology on High-Temperature Failure Behavior of Silicone Coatings

引用本文:

赵统君王星尧陈泽浩杨莎莎王金龙陈明辉朱圣龙王福会. 铝颜料形貌对有机硅涂层高温失效行为的影响机制[J]. 中国腐蚀与防护学报, 10.11902/1005.4537.2025.213.

全文: PDF(1954 KB)

摘要: 本文研究了铝颜料形貌对有机硅涂层高温失效行为的影响机制。实验以Ti-6Al-4V合金为基体，制备了未添加铝粉（0F）、添加球形铝粉（2S）和添加片状铝粉（2F）的三种有机硅复合涂层。通过500°C热暴露实验，结合拉伸测试、断口形貌分析及微观表征，系统研究了涂层的耐热性能、力学性能与失效行为。结果表明：片状铝粉（2F）通过诱导裂纹多重偏转，显著提升了涂层的韧性（断裂功：60.89 kJ/m3，较0F涂层提高65%），高温下其桥联效应能有效耗散热弹性应变能，抑制了贯通裂纹的形成，使涂层在100 h热暴露后保持结构完整。相比之下，0F与2S涂层因热应力累积及树脂降解发生严重剥落。研究表明，片状铝粉通过协同增韧机制（裂纹路径延长与桥联效应）可显著提升有机硅涂层在高温下的韧性，这为设计高性能耐热防护涂层提供了基于形貌调控的新策略。

关键词 ：耐热有机硅涂层, 片状铝粉, 裂纹偏转, 断裂功, 韧性

Abstract：The influence mechanism of aluminum pigment morphology on the high-temperature failure behavior of silicone coatings was investigated in this study. Three types of silicone composite coatings were prepared on Ti-6Al-4V alloy substrates: an aluminum-free coating (0F), a coating with sphere-Al powder (2S), and a coating with flake-Al powder (2F). The thermal resistance, mechanical properties, and failure behavior of the coatings were systematically evaluated using heat exposure tests at 500°C, combined with tensile testing, fracture morphology analysis, and microstructural characterization. The results showed that flake-Al particles (2F) significantly enhanced coating t oughness by inducing multiple crack deflections (fracture work: 60.89 kJ/m3, 65% higher than 0F). At elevated temperatures, their bridging effects effectively dissipated thermoelastic strain energy, suppressing penetrating crack formation and maintaining coating structural integrity after 100 h of heat exposure. In contrast, 0F and 2S coatings exhibited severe spalling due to thermal stress accumulation and resin degradation. This study revealed that, at high temperatures, flake-Al powder significantly enhanced the toughness of silicone coatings via synergistic mechanisms (crack path extension and bridging effects). This provides a novel strategy for designing high-performance and heat-resistant coatings through morphology regulation.

Key words： Heat-resistant silicone coating, Flake aluminum powder, Crack deflection, Fracture work, Toughness

收稿日期: 2025-07-05

基金资助:中央高校基本科研业务费

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	赵统君
	王星尧
	陈泽浩
	杨莎莎
	王金龙
	陈明辉
	朱圣龙
	王福会
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https://www.jcscp.org/CN/Y0/V/I/0

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