Ti_2SC陶瓷粉体的制备及其机理研究

Synthesis and Reaction Mechanism of High Purity Ti_2SC Powder by Pressureless Sintering

以TiS2、Ti、C为原料,利用无压烧结方法制备Ti2SC陶瓷粉体。研究了组成和烧结温度对试样物相组成的影响。利用XRD、SEM、差热分析和热力学分析方法对样品的物相和反应路径进行表征分析。结果表明：当原始组分中S过量10at%时,样品主相为TiS,只有少量目标相Ti2SC存在。随着S过量的增加,目标相含量随之增加,但C含量减少。当S过量30at%时,样品中主相为Ti2SC,只有微量的C,TiC和TiS存在。当原料比为1.15TiS2/2.85Ti/2C时,烧成温度为1 600℃,氩气气氛下合成了纯度较高的Ti2SC陶瓷粉体,其晶粒尺寸为510μm。在TiS2-Ti-C体系中,由TiS和TiC反应生成目标相Ti2SC。

Highly pure TiaSC powder was synthesized by pressureless sintering a TiS2/Ti/C powder system. The effect of composition and sintering temperature on the synthesis of Ti2 SC was studied.By XRD,SEM, DSC and thermodynamics, the phase assemblyand reaction mechanism of samples were analyzed.The results indicate that with additional sulfur 10at%, the sample mainly consisted of TiS, and small amount of Ti2 SC phase were detected.The amount of Ti2 SC increased and graphite decreased gradually with increase in S in the composition.When the additional sulfur was 30 at% ,large amount of Ti2 SC was synthesized with little amount of TiS,C and TiC.When stoichiometric ratio was 1.15TiS2/2.85Ti/2C,high purity Ti2 SC particles with thesize of 5-10μm was achieved at 1 600℃.In TiS2-Ti-C system,Ti-S compounds reacted with TiC to produce Ti2 SC.