钛粉在聚硅氮烷裂解制备陶瓷材料中的应用

Applications of Ti Powder in Preparation of Ceramics by Polysilazane Pyrolysis

摘要:

采用IR、TG、XRD等手段研究分析钛粉作为活性填料在聚硅氮烷裂解制备陶瓷材料中的应用。实验表明：钛粉可以有效改善先驱体的陶瓷产率，本实验中纯PSN-1先驱体在经1300 ℃裂解陶瓷产率仅为37.3%，通过加入质量比3/10（Ti/PSN-1）的钛粉，经1300 ℃裂解陶瓷产率为78.7%，提高了约40%；经红外光谱分析表明，通过向先驱体中加入Ti粉可以加速有机先驱体向无机陶瓷转化的速度；经X衍射分析表明，Ti粉作为活性填料能与先驱体裂解挥发份及保护气氛发生反应，生成TiC、TiN等新的物相，有利于提高陶瓷产率。

关键词:钛粉;聚硅氮烷先驱体;裂解;陶瓷产率

Abstract:

The application of Ti powder as active filler in the ceramic preparation by polysilazane (PSN-1) precursor pyrolysis was researched by means of IR, TG and XRD. Results show that Ti powder can effectively improve the ceramic yield of the precursor. In the experiment, the ceramic yield of the pure PSN-1 precursor pyrolyzed at 1300 oC was only 37.3%; while after adding Ti powder (Ti/PSN-1=3/10, mass fraction), the yield after 1300 oC pyrolysis was 78.7%, increasing by 40%. IR spectra reveal Ti powder addition to the precursor can accelerate the transformation from organic precursor to inorganic ceramic. XRD analysis show Ti powder as an active filler in the precursor can react with the cracker-volatile and the protective atmosphere, generating TiC, TiN and other new phases, which favors the increase of the ceramic yield.

Key words:titanium powder; polysilazane precursor; pyrolysis; ceramic yield