International Journal of Refractory Metals & Hard Materials ( IF 3.6 ) Pub Date : 2020-11-21 , DOI: 10.1016/j.ijrmhm.2020.105444 Yaghoub Pazhouhanfar , Seyed Ali Delbari , Mehdi Shahedi Asl , Shahrzad Shaddel , Morteza Pazhouhanfar , Quyet Van Le , Mohammadreza Shokouhimehr , Mohsen Mohammadi , Abbas Sabahi Namini
This research aimed to compare the TiC and TiC-Si3N4 ceramics in terms of sintering behavior and physical-mechanical characteristics. The spark plasma sintering (SPS) process was used as the fabrication route with the sintering conditions of 1900 °C, 7 min, and 40 MPa. The results confirmed the deposition of carbon in the monolithic TiC during the SPS process. Incorporating Si3N4 led to the advancements of some chemical reactions between TiC, Si3N4, and carbon ingredients, leading to the in-situ formation of SiC and N2 phases. Although the thermodynamic assessment suggested the in-situ synthesis of the TiN phase, too, any amount of it was identified in neither the X-ray diffractometry pattern nor field emission scanning electron microscopy images. Based on the thermodynamic study, TiN possibly reacted with the deposited carbon, forming in-situ TiC and N2. Thermal conductivity, Vickers hardness, and flexural strength of 10.1 W/mK, 2966 HV0.1kg, and 219 MPa, respectively, were obtained for the TiC-Si3N4 ceramic.
中文翻译:
放电等离子体烧结TiC–Si 3 N 4陶瓷的表征
这项研究旨在比较TiC和TiC-Si 3 N 4陶瓷的烧结行为和物理机械特性。采用火花等离子体烧结(SPS)工艺作为烧结工艺,烧结条件为1900°C,7 min和40 MPa。结果证实了在SPS过程中碳在单片TiC中的沉积。掺入Si 3 N 4导致TiC,Si 3 N 4和碳成分之间发生一些化学反应,从而导致SiC和N 2原位形成阶段。尽管热力学评估也提示了TiN相的原位合成,但在X射线衍射图谱和场发射扫描电子显微镜图像中均未发现任何量的TiN相。根据热力学研究,TiN可能与沉积的碳发生反应,形成原位TiC和N 2。TiC-Si 3 N 4陶瓷的热导率,维氏硬度和抗弯强度分别为10.1 W / mK,2966 HV 0.1kg和219 MPa 。