中文摘要：

通过放电等离子烧结（SPS）和真空烧结（VS）制备纳米复合Ti（C，N）基金属陶瓷，利用光学显微镜、扫描电镜等观察试样的收缩特性与微观结构、孔隙率与机械性能，并进行了对比研究，结果表明：①在常规真空烧结过程中，试样的收缩主要发生在1000～1300℃温度范围内，且仅有0.2％的收缩发生在800℃以下；而在放电等离子烧结中，由于一开始就有压力作用，试样收缩的60％发生在800℃以下。②由于放电等离子烧结试样的孔隙率要远高于真空烧结试样，从而使其抗弯强度和硬度低于真空烧结试样。③放电等离子烧结试样的显微结构主要为白影灰壳结构，甚至没有明显的芯／壳结构，而真空烧结则主要为黑芯／灰壳结构。

英文摘要：

Spark plasma sintering （SPS） and vacuum sintering （VS） are employed to fabricate nano-composite Ti （C, N）-based cermets. The shrinkage behavior, microstructure, porosity and mechanical properties of samples fabricated by SPS are compared with VS using optical microscopy, scanning electron microscopy, universal testing machine and Rockwell tester. The results indicate：（1） The shrinkage process occurs mainly in the range of 1000℃ to 1300℃ during the VS process, and only 0. 2% linear shrinkage ratio appears below 800℃ ,yet ,during the SPS process,60% dimensional change occurs below 800℃as a result of pressure action; （2） It is difficult to obtain fully dense Ti（C,N）-based cermets by SPS due to the plenty of pores and uncombined carbon,and mechanical properties of sintered samples by SPS are inferior to VS; （3） Main microstructures of sintered samples by SPS are white core/grey shell, some even haven＇t typical core/shell microstructures,whereas by VS show typical black core/grey shell structure.