摘要
以Ti/Si/C粉末和Ti/Si/TiC粉末为原料,采用液态熔渗硅方法制备出纯度较高的Ti3SiC2材料,Ti3SiC2的相对质量分数分别达到91.2%和92.3%。研究表明,熔渗烧结制备Ti3SiC2的反应过程为:温度在1 300℃以上,且未发生熔渗时,试样中单质Ti的含量高于Si的含量,在Ti的富集区优先生成Ti5Si3,随着温度的升高,少部分Ti5Si3和β-Ti先熔合形成Ti-Si液相;在1 500℃时,随着液态Si的渗入及流动扩散,液态Si和剩余的Ti5Si3形成大量Ti-Si液相,将试样中的TiC包覆,通过液相反应生成大量的Ti3SiC2。
The purer bulk Ti3SiC2 ceramic had been prepared from Ti/Si/C and Ti/Si/TiC mixed powders by melt infiltrating method,and the content of Ti3SiC2 in the two test samples which were made from Ti/Si/C and Ti/Si/TiC mixed powders is up to 91.2 wt% and 92.3 wt%,respectively.The results showed that the reaction mechanism of Ti3SiC2 by melt infiltrating sintering method is that the Ti5Si3 is easier to obtain in the rich Ti areas in which the content of Ti is higher than that of Si at 1 300 ℃.With the increase of temperature, few Ti5Si3 reacts with β-Ti to form liquid phase of Ti-Si. When the liquid Si infiltrates at 1 500 ℃, liquid Si react with the rest Ti5Si3 to form liquid phase of Ti-Si. The formed liquid phase of Ti-Si would wrap the TiC particles to form a great deal of Ti3SiC2 by liquid phase reaction.
出处
《兵器材料科学与工程》
CAS
CSCD
2009年第4期77-80,共4页
Ordnance Material Science and Engineering
基金
陕西省自然科学基金项目2007E104
关键词
碳化硅钛
熔渗烧结
反应机理
Ti3SiC2
infiltration sintering
reaction mechanism
