致密TiC-Al2O3-Fe 金属陶瓷的自蔓延高温合成

DENSE TiC-Al_2O_3-Fe CERMET FABRICATED BY SHS

  • 摘要: 通过自蔓延高温合成结合准热等静压法(SHS/PH IP) 制备出了致密的TiC2Al2O3-20Fe 金属陶瓷。研究了延迟时间、高压持续时间、压力等工艺参数对金属陶瓷密实度的影响, 分析了金属陶瓷的相组成、微观组织及性能。结果表明, 燃烧合成过程中气体的排放和液相的存在是合成密实材料的关键, 通过优化工艺合成了密实度为97. 7% 的TiC2Al2O3-20Fe 金属陶瓷。金属陶瓷由TiC、Al2O3 和Fe 粘结相组成。粘结相Fe 与Al2O3 之间界面光滑,Fe 与T iC 之间有一较薄扩散层。TiC2Al2O3-20Fe 金属陶瓷的抗弯强度和抗压强度分别为890M Pa 和18. 4 GPa。

     

    Abstract: Dense TiC-Al2O3-20Fe cermet was produced by self propagating high temperature synthesis and pseudo hot isostatic pressing(SHS/PHIP). The influences of pressing processes (delay time, high pressure and high pressure time) on density of TiC-Al2O3-20Fe cermets was researched. The composition, microstructure and properties of the products were analyzed. The results show that, in the process of preparing TiC-Al2O3-20Fe cermet by SHS/PHIP, the release of gases and the existence of the liquid are the important factors. The products consist of TiC and Al2O3 particles and quasi continuous Fe binder phase. The interfacial bonding between Fe and Al2O3 is very smooth. A thin diffusion layer was found between Fe and TiC. Transverse rupture strength and compressive strength are approximately 890MPa and 18.4GPa.

     

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