Abstract
The novel ceramic/metal composite materials were successfully fabricated by combustion synthesis in high gravity field. In this paper, the Ti-B4C was selected as the main combustion reaction system to obtain TiB2-TiC ceramic substrate, and the 1Cr18Ni9Ti stainless steel was selected as the metal substrate. It was found that the TiB2-TiC/1Cr18Ni9Ti composite materials exhibited continuously graded composition and hybrid microstructure. The TiC1−x carbides and TiB2 platelets decreased gradually in size and volume fraction from the ceramic to stainless steel. Due to the rapid action of thermal explosion as well as the dissolution of the molten stainless steel into TiB2-TiC liquid, the diffusion-controlled concentration gradient from the ceramic liquid to the alloy liquid was observed. Finally, as a result of the rapid sequent solidification of the ceramic liquid and the melt alloy surface, the laminated composite materials were achieved in multilevel, scale-span hybrid microstructure.
Highlights
Because of its high hardness, high corrosion resistance, good thermal shock resistance, and high temperature stability, TiB2-based ceramic composites attract a lot of attention as the potential materials in engineering applications [1,2]
The results of X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) show that the TiB2–TiC ceramic is composed of fine TiB2 platelets as the primary phase, irregular TiC grains as the secondary phase, and a few of Cr-based intermetallic binder as intercrystalline phase, as shown in Fig. 2 and Fig. 3
According to the equilibrium diagram of the TiB2–TiC system [1], the melting temperature of 66.7%TiB2–TiC ceramic is around 2900 °C, which is much smaller than the designed combustion temperature in current experiments, the full-liquid products of TiC, TiB2, Cr, and Al2O3 can be achieved in combustion reaction
Summary
Because of its high hardness, high corrosion resistance, good thermal shock resistance, and high temperature stability, TiB2-based ceramic composites attract a lot of attention as the potential materials in engineering applications [1,2]. Combustion synthesis which was called self-propagating high-temperature synthesis (SHS) is being used to produce ceramics, intermetallics, and composite materials [11,12,13,14]. Based on this technology, joining a ductile metal with a brittle ceramic composite matrix has considerable potential for substantial improvements in fracture toughness [15]. In the thesis, applying combustion synthesis in ultrahigh gravity field to achieve laminated composite materials of the ceramic on stainless steel substrate, and the microstructure and formation mechanism of the laminated composite of the ceramic on stainless steel are discussed
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
