中文摘要：

在1400℃,用Ti,Si,C,Al,NaCl原料,氩气保护下无压烧结合成出纯净的、层状的Ti3SiC2陶瓷。用X射线衍射、扫描电子显微镜,透射电子显微镜对Ti3SiC2陶瓷的物相、表面形貌、微观结构进行表征。对合成出的Ti3SiC2陶瓷的微观形貌进行观察,发现Ti3SiC2晶体中有规整的六方形状的层状晶体,提出了Ti3SiC2晶体的自由生长的机理。Ti3SiC2晶体的生长机理由二维成核理论控制,台阶状晶体生长的形貌表明（002）晶面的生长要经过两个独立的过程。添加NaCl,有助于生成高纯度的层状Ti3SiC2陶瓷。

英文摘要：

The laminated Ti3SiC2 ceramics were fabricated by reactive sintering a mixture of Ti,Si,C,and Al powders and NaCl additive,at 1400℃ in argon atmosphere.The impacts of the sintering conditions on the quality of Ti3SiC2 ceramics were evaluated.The microstructures,phase structures,and surface morphologies of the Ti3SiC2 ceramics were characterized with X-ray diffraction,scanning electron microscopy,and transmission electron microscopy.The results show that the laminated,highly hexagonal Ti3SiC2 crystal grains exist in the ceramics,and that the addition of NaCl strongly improves the purity of Ti3SiC2.ceramics.The possible growth mechanisms responsible for the laminated grains were tentatively discussed.