中文摘要：

将焦宝石粉、活性炭粉和铝粉按质量比39：27．6：33．4配料作为基料，再分别加入占基料总质量0、3％、6％和9％的TiO2粉末（锐钛矿型），加入〈10％的酚醛树脂为结合剂混匀后，压制成型，坯体试样干燥后，置于刚玉管式炉中，通入流动氩气，分别于1300、1400、1500、1600和1700℃保温2h制备了Al4SiC4-Al4O4C复合材料。利用热重分析、化学分析、XRD和SEM等测试技术，研究了TiO：加入量对材料物相组成和显微结构的影响。结果表明：试样中的Ti在烧成过程中有少量损失，残余的TiO，在1300℃前全部反应转变为TiC，生成的TiC在1300-1700℃稳定存在；TiO2加入量对材料物相组成没有明显影响，但TiO2加入量超过3％时。Al4SiC4和Al4O4C的生成温度将由1500℃提升至1600℃；随着材料中Ti^4＋浓度增加，Ti^4＋更容易与Al4SiC4形成有限置换固溶体而导致晶格缺陷，促使Al4SiC4在1700℃分解，形成更多的Al4O4C短纤维，同时使试样表面生成片状Al2O3层。

英文摘要：

The Al4SiC4 -Al4O4C composites were synthesized based on the mass ratio of sintered clay,activated carbon,and aluminum powder being 39：27.6：33.4,adding in addition TiO2 powder （anatase type,0,3%, 6% ,9%, respectively）, adding 〈 10% phenolic resins as binder, mixing well, pressing, drying, firing in corundum tubular furnace in flowing argon at 1 300, 1 400,1 500,1 600 and 1 700℃ for 2 h. The effect of TiO2 addition on phase composition and microstructure of Al4SiC4 -Al4O4C composites was investigated by TGA,chemical analysis,XRD and SEM. The results show that. （1）Ti in the specimens loses a little in the process of firing,all residual TiO2 transforms into TiC when the firing temperature is under 1 300 ℃,and the formed TiC exists stably at 1300- 1700℃; （2）The TiO2 addition has little effect on phase composition of composites;however, when more than 3% of TiO2 is added, the formation temperature of Al4SiC4 and Al4O4C increase from 1 500℃ to 1600℃; （3）With the concentration of Ti^＋4 increasing ,Ti^4＋ may react easily with Al4SiC4 and Al4O4C forming the finite substitution solid solution resulting in lattice defect,which pro- motes the decomposition of Al4SiC4 at 1700℃,the formation of more Al4O4C short fiber,and the formation of flake Al2O3 layer on surface of the specimen.