The effects of P/Al ratio and Cr/Al ratio on the phase composition,microstructure,mechanical properties and dielectric properties of quartz fiber-reinforced phosphate composites were investigated.The results show that the phase composition of the phosphate matrix is mainly composed of Berlinite phase,low-temperature quartz type AlPO4 and unreacted α-Al2O3,and the composition ratio and microstructure of the matrix phase are influenced by the P/Al ratio and Cr/P ratio.When P/Al=4.1 and Cr/P=0.04,the composites have the best mechanical properties,with tensile strength of 108.6 MPa,bending strength of 135.3 MPa and fracture toughness KIC of 6.6 MPa·m1/2,and the composites exhibit the plastic fracture characteristics of weak bonding interface.It is analyzed that at this time the matrix contains more Al(H2PO4)3 phase with good bonding properties,and the matrix exhibits a smooth planar-like structure,which is conducive to the formation of a complete and continuous good interfacial layer between the matrix and the fiber.In addition,the dielectric properties of the materials are greatly affected by the Cr content,except for Cr/P=0.08 materials,the dielectric properties of the prepared materials can meet the performance requirements of high-temperature wave-transparent materials,and have a broad application prospect.
关键词
磷酸盐/石英纤维织物/力学性能/P/Al比/Cr/P比
Key words
Phosphate/Quartz fiber fabric/Mechanical properties/P/Al ratio/Cr/P ratio
维普
万方数据