固含量对浆料浸渍法制备氧化铝陶瓷基复合材料结构与性能的影响  

Effect of solid content on structure and properties of alumina ceramic matrix composite prepared by slurry infiltration method

作　　者：冻瑞岚 彭志航 向阳 曹峰[1] DONG Ruilan;PENG Zhihang;XIANG Yang;CAO Feng(Science and Technology on Advanced Ceramic Fibers and Composites Laboratory,College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学空天科学学院新型陶瓷纤维及其复合材料重点实验室,长沙410073

出　　处：《材料工程》2023年第8期120-129,共10页Journal of Materials Engineering

基　　金：国家自然科学基金项目(51802344)。

摘　　要：氧化铝纤维增强氧化铝陶瓷基复合材料具有耐高温、高强度、抗氧化等特点,在航空航天热结构材料方向具有广阔的应用前景。使用Nextel^(TM)610纤维布作为增强体,以浆料浸渍-模压成型工艺制备复合材料粗坯,经马弗炉一次高温烧结获得氧化铝陶瓷基复合材料。通过对纤维和基体的晶体结构、力学强度等性能随热处理温度变化的影响确定适合复合材料制备的温度范围。研究不同固含量浆料对复合材料力学性能和微观结构的影响。结果表明:Nextel^(TM)610/Al 2O 3陶瓷基复合材料的弯曲强度随着固含量的增大呈先增大后减小的变化趋势,当浆料固含量为60%(质量分数,下同)时,其弯曲强度最大,达到370.68 MPa。当固含量小于60%时,复合材料弯曲强度较低的原因是纤维束内的基体填充不足;当固含量增大至65%时,复合材料弯曲强度衰减原因是过多基体缺陷的产生和纤维-基体界面间结合增强,阻碍了纤维脱粘、拔出等增韧机制。Alumina fiber reinforced alumina ceramic matrix composites possess high temperature resistance,high strength and oxidation resistance,etc,and have a considerable application prospects in the field of thermal structural materials used in aerospace.Using Nextel^(TM)610 fabric as the reinforcement,alumina ceramic matrix composites were prepared by Slurry Infiltration-molding process and sintered in a muffle furnace at high temperature for one time.The temperature range suitable for the preparation of composites was determined by the effects of heat treatment temperature on the crystalline phase,mechanical strength and other properties of fiber and matrix.The effects of solid content on the mechanical properties and microstructure of the composites were studied.The results show that the bending strength of Nextel^(TM)610/Al 2O 3 ceramic matrix composite increases first and then decreases with the increase of solid content.When the solid content of the slurry is 60%(mass fraction,the same below),the bending strength is the largest,up to 370.68 MPa.When the solid content is less than 60%,the reason why the flexural strength of the composite is low is that the matrix in the fiber bundles is not filled enough.When the solid content increases to 65%,the degradation of the flexural strength of the composite is due to the formation of too many matrix defects and the strengthening of the fiber-matrix interface,which hinders the fiber debonding,pull-out and other toughening mechanisms.

关 键 词：浆料法 固含量 氧化铝 陶瓷基复合材料 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]