【摘要】 采用不同厚度的MgO-Al2O3-SiO2(MAS)玻璃作为中间层,对表面改性炭/炭(C/C)复合材料与Li2CO3-Al2O3-SiO2(LAS)玻璃陶瓷进行热压连接,重点研究了中间层厚度对接头强度的影响,并利用扫描电子显微镜(SEM)对连接界面及剪切断口的微观组织和形貌进行了分析.结果表明:没有添加中间层时,接头强度仅为10MPa;采用MAS玻璃作为中间层时,接头室温剪切强度随着中间层厚度的增加先增大后减小,当中间层厚度为80μm时,获得的接头剪切强度最大,为26.61MPa.更多还原

【Abstract】 Surface modified carbon/carbon(C/C) composites were joined to Li2CO3-Al2O3-SiO2(LAS) glass ceramic by hot pressing bonding using MgO-Al2O3-SiO2(MAS) glass with different thicknesses as the joining material.The effect of interlayer thickness on the joint strength was discussed.Microstructures and mor-phologies of the as-received joints and fractured surfaces were characterized by scanning electron microscope.The results indicated that the LAS glass was directly joined to the surface modified C/C composites at 1200℃,and the room-temperature shear strength of the joints was only 10MPa,due to its poor wettability with base material.When the MAS glass was applied as interlayer,the joint shear strength increased at first and then decreased with the increase of the interlayer thickness.The maximum value of the shear strength reached 26.61MPa when interlayer thickness was 80μm.更多还原