KH-560和玻璃粉对硅树脂涂层热防护性能的影响  

Effect of KH-560 and Glass Powder on the Thermal Protection Performance of Silicone Resin Coatings

作　　者：罗屹峰 廖桓毅 蒋耀年 戴翠英 李沙 吴志远 左劲旅 张伟 毛卫国 LUO Yifeng;LIAO Huanyi;JIANG Yaonian;DAI Cuiying;LI Sha;WU Zhiyuan;ZUO Jinglyu;ZHANG Wei;MAO Weiguo(School of Materials Science and Engineering,Changsha University of Science&Technology,Changsha 410014,China;Hunan Provincial Key Laboratory of Advanced Coating Technology for High-end Equipment,Changsha 410014,China;Hunan BOYUN New Materials Co.,Ltd.,Changsha 410205,China)

机构地区：[1]长沙理工大学材料科学与工程学院,湖南长沙410014 [2]高端装备先进涂层技术湖南省重点实验室,湖南长沙410014 [3]湖南博云新材料股份有限公司,湖南长沙410205

出　　处：《材料保护》2024年第8期198-205,共8页Materials Protection

基　　金：国家科技重大专项(J2019-VI-0017-0132,J2022-VI-0008-0039);国家重点研发计划(2021YFB3702304-4);博云新材航天用先进碳基耐烧蚀材料领域创新团队项目。

摘　　要：为进一步提高硅树脂涂层的力学性能与服役温度,研究了硅烷偶联剂KH-560和低熔点玻璃粉对硅树脂涂层热防护性能的影响。采用高温型固体材料动态弹性性能测试仪、万能电子拉伸机、膨胀仪、燃气热冲击实验系统表征涂层的弹性模量、结合强度、热膨胀系数、烧蚀、隔热、热冲击性能;采用红外光谱仪、发射扫描电子显微镜及其附带的能谱分析涂层组成、表面微观形貌、元素含量。结果表明:随着KH-560含量的增加(0~3%),硅树脂涂层的弹性模量和结合强度先增加后减少。当加入2.0%KH-560时,在常温下涂层的弹性模量和结合强度达到最大值,分别为24.10 GPa、4.40 MPa,这主要是因为KH-560使得硅树脂和金属基底之间的键合以及填料与硅树脂之间的键合增强。掺入110%的玻璃粉时,能够有效改善硅树脂涂层在800℃的热稳定性和抗热震性能,这是由于熔化的玻璃粉可填补硅树脂分解所产生的孔隙,从而阻止硅树脂进一步氧化分解。此外,玻璃粉含量为110%的硅树脂涂层具有良好的隔热和烧蚀性能。To further enhance the mechanical properties and service temperature of silicone resin coatings,the effects of the silane coupling agent KH-560 and low melting point glass powder on the thermal protection performance of silicone resin coatings were investigated.The elastic modulus,bonding strength,thermal expansion coefficient,ablation,thermal insulation and thermal shock properties of the coating were tested using a high-temperature solid material dynamic elastic property tester,a universal electronic tensile machine,an expansion meter and a gas thermal shock experimental system;The composition,surface micromorphology and elemental content of the coating were analyzed using infra-red spectroscopy,emission scanning electron microscopy,and its attached energy spectrum analysis.Results showed that with increasing KH-560 content(0~3%),the elastic modulus and adhesion strength of the silicone resin coatings were initially increased and then decreased.When 2.0%KH-560 was added,the maximum values for the elastic modulus and adhesion strength of the coatings were achieved at room temper-ature,reaching 24.10 GPa and 4.40 MPa,respectively.This was mainly attributed to the enhancement of bonding between the silicone resin and the metal substrate,as well as between the filler and the silicone resin facilitated by KH-560.The addition of 110%glass powder was found to ef-fectively improve the thermal stability and thermal shock resistance of the silicone resin coatings at 800℃,due to the melting of glass powder,which filled the voids generated by the decomposition of silicone resin,thereby preventing further oxidation decomposition of the silicone resin.Additionally,silicone resin coatings with a glass powder content of 110%were observed to exhibit good thermal insulation and ablative properties.

关 键 词：耐高温硅树脂涂层 硅烷偶联剂 低熔点玻璃粉 力学性能 热学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]