燃煤电厂玻璃钢板材耐高温力学性能研究

Study on mechanical propertiesof fiber reinforced plastic plate after high-temperature agingin coal-fired power plant

为了研究高温对燃煤电厂玻璃钢板材(以下简称:FRP板材)力学性能的影响,以90℃作为高温环境,设置0 d、30 d、60 d、90 d四个测试时间点,对以"缠绕纱/单向布/缠绕纱/单向布/缠绕纱/短切毡/缠绕纱"为基本结构、经缠绕成型制备的铺层厚度为3. 24 mm、6. 48 mm、9. 72 mm的FRP板材高温老化后的力学性能进行研究。结果表明:随着FRP板材厚度的增加,单向布含量增加,轴向弯曲和轴向拉伸强度均呈上升的趋势;压缩强度的变化趋势和树脂含量的变化趋势一致,表明树脂含量对材料的压缩强度起主要作用;高温老化对FRP板材的弯曲、拉伸、压缩强度均有一定的影响,其中,弯曲强度受高温老化的影响最小,压缩强度受高温老化的影响最为明显,三种试样在90℃老化90 d后,弯曲强度保留率均在85%以上,压缩强度保留率在70%左右; SEM测试表明,高温老化后试样出现明显的纤维拔出,表明纤维/树脂基体界面遭到破坏。最后,建议燃煤电厂FRP板材在制作过程中,重点控制树脂含量。

In this paper,the mechanical properties off FRP plate after high temperature aging in coal fired power plant were investigated.Three kinds of FRP plates with the layer thickness of 3.24mm 、6.48mm、9.72mm were manufactured by filament winding technique.The aging temperature was set as 90℃and the aging time was set as 0d、30d、60d、90d.The results show that thecontent of UF increases with the thickness increases,and the axial direction flexural strength and tensile strength exhibitan up trend.Simultaneously,the trend of change of compress strength is consistent with that of resin content,which indicates that resin content has great effect in the compress property.In addition,the flexural strength,tensile strength and compress strength of composites respectively show different degrees of decline after high temperature aging.And the compress strength exhibits the most obvious degradation.After hightemperature aging,the retention rate of flexural strength is above 85% and that of compress strength is around 70%.It can be observed from SEM test thatfiber pulls out after aging and the interfacial deboning develops between fiber and matrix.It is suggested that resin content should be controlled well in the manufacturing process of FRP plate.