摘要
石晶复合材料(SCC)在长期使用过程中易受到温度与氧气的破坏,导致材料结构发生变化,使用寿命显著降低,因此,提高其耐热氧老化性能是产品能广泛应用的重要前提。采用聚乙二醇(PEG)、甲基丙烯酸甲酯(MMA)、过氧化二异丙苯(DCP)复合溶液对钢渣微粉(SS)进行表面改性获得改性钢渣微粉(MSSP),并将其替代滑石粉通过熔融共混与热压相结合制备钢渣基石晶复合材料(MSSP/SCC),测试MSSP/SCC热氧老化前后的弯曲强度、颜色变化。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶红外光谱仪(FTIR)与X射线光电子能谱仪(XPS)分析MSSP对SCC的作用机理。试验结果表明,MSSP替代滑石粉比例为50%(质量分数)时,MSSP/SCC经过热氧老化16 d的弯曲强度达到27.1 MPa,弯曲强度保持率为89.7%,相比于普通SCC,分别提高了53.9%和25.3%,且总色差△E变化最低,为0.51。MSSP与SCC体系在MSSP/SCC出现网状纤维。MSSP以及表面羟基可以作为交联点与SCC体系产生物理化学交联作用,有利于抗热氧老化。在热氧过程中,MSSP与SCC体系形成的纤维网状结构有利于提高弯曲性能。MSSP替代滑石粉比例为50%(质量分数)时,MSSP与SCC体系界面相容性好,MSSP与木粉能被高密度聚乙烯树脂(HDPE)较好包裹,表面结构更紧密,可阻止热氧传递,MSSP表面形成的羟基与SCC体系热氧老化后产生的自由基结合,可终止链式反应,提高耐热氧老化性能。
Stone crystal composites(SCC)are prone to damage from temperature and oxygen during long-term use,leading to changes in the material's structure and a significant reduction in service life.Therefore,improving heat and oxygen aging resistance is an important prerequisite for the widespread application of the product.Steel slag micro-powder(SS)was surface-modified using a composite solution of polyethylene glycol(PEG),methyl methacrylate(MMA),and dicumyl peroxide(DCP)to produce modified steel slag micro-powder(MSSP).MSSP was then used to replace talcum powder and combined with molten blending and hot pressing to prepare steel slag-based stone crystal composites(MSSP/SCC).The flexural strength and color changes of MSSP/SCC before and after heat-oxygen aging were tested.Scanning electron microscopy(SEM),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),and X-ray photoelectron spectroscopy(XPS)were employed to analyze the mechanism of MSSP in the SCC system.The experimental results show that when MSSP replaces talcum powder at a ratio of 50%(mass fraction),the flexural strength of MSSP/SCC after 16 days of heat-oxygen aging reaches 27.1 MPa,with a flexural strength retention rate of 89.7%.Compared to ordinary stone crystal composites,these values represent increases of 53.9%and 25.3%,respectively.Meanwhile,the total color differenceΔE change is minimal at 0.51.MSSP forms a fibrous network within the MSSP/SCC system.MSSP can act as a crosslinking point,and its surface hydroxyl groups form physico-chemical crosslinking interactions with the SCC system,which is beneficial for resistance to heat and oxygen aging.During heat-oxygen exposure,the fiber network structure formed by MSSP in the SCC system helps improve flexural properties.When the substitution ratio of MSSP for talcum powder is 50%(mass fraction),the interfacial compatibility between MSSP and the SCC system is good.MSSP and wood flour can be well encapsulated by high-density polyethylene resin(HDPE),resulting in a tighter surface structure that inhibits the transfer of heat and oxygen.The hydroxyl groups formed on the surface of MSSP combine with the free radicals generated by the SCC system after thermal-oxidative aging,terminating the chain reactions and thereby enhancing the thermal-oxidative aging resistance.
作者
苏畅
赵令
刘顺
张浩
陈良军
宗志芳
SU Chang;ZHAO Ling;LIU Shun;ZHANG Hao;CHEN Liangjun;ZONG Zhifang(School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243032,Anhui,China;Anhui Province Key Laboratory of Metallurgy Engineering and Resources Recycling(Anhui University of Technology),Maanshan 243002,Anhui,China;Key Laboratory of Mine Low-carbon Reclamation and Solid Waste Resource Utilization of Maanshan,Anhui University of Technology,Maanshan 243032,Anhui,China;School of Civil Engineering and Architecture,Anhui University of Technology,Maanshan 243032,Anhui,China)
出处
《钢铁》
北大核心
2025年第9期184-193,共10页
Iron and Steel
基金
国家自然科学基金区域联合重点资助项目(U23A20605)
安徽省科技创新平台重大科技资助项目(202305a12020019)
国家自然科学基金青年科学基金资助项目(52404333)
中国宝武低碳冶金创新基金资助项目(BWLCF-202202)。
关键词
钢渣微粉
石晶复合材料
复合改性
耐热氧老化性能
力学性能
颜色变化
自由基链式反应
固废综合利用
steel slag micro-powder
stone crystal composite material
composite modification
heat-resistant oxidative aging performance
mechanical property
color change
free-radical chain reaction
comprehensive utilization of solid waste
