Abstract: ZrSiO4 and TiO2 were added as additives into the system of Al-Fe2O3, their effects on the microstructures and properties of ceramic-lined composite pipe made by centrifugal-SHS (self-propagating high-temperature synthesis) process were studied. When the additive is ZrSiO4, the phase of the ceramic layer is mainly composed of α-Al2O3, FeAl2O4 and minority of m-ZrO2. The ceramic porosity increases and the bonding strength of the ceramic layer decreases with the increase of ZrSiO4. The toughness of the ceramic layer is improved by microcracks induced due to phase transition of t-ZrO2 to m-ZrO2 coming from the decomposition of ZrSiO4. When the additive is TiO2, the phase of the ceramic layer is mainly composed of α-Al2O3, FeAl2O4 and tittle Fe4(TiO4)3. The ceramic porosity decreases and the bonding strength of the ceramic layer increases quickly with increasing the content of TiO2; the improvement of ceramic crack failure lies in that the rupture strength is increased and that the tendency of thermal crack formation is diminished.
Effects of adding ZrSiO4 and TiO2 on microstructures and properties of ceramic-lined composite pipe made by centrifugal-SHS process
Abstract:
ZrSiO 4 and TiO 2 were added as additives into the system of Al-Fe 2O 3, their effects on the microstructures and properties of ceramic-lined composite pipe made by centrifugal-SHS (self-propagating high-temperature synthesis) process were studied. When the additive is ZrSiO 4, the phase of the ceramic layer is mainly composed of α-Al 2O 3, FeAl 2O 4 and minority of m-ZrO 2. The ceramic porosity increases and the bonding strength of the ceramic layer decreases with the increase of ZrSiO 4. The toughness of the ceramic layer is improved by microcracks induced due to phase transition of t-ZrO 2 to m-ZrO 2 coming from the decomposition of ZrSiO 4. When the additive is TiO 2, the phase of the ceramic layer is mainly composed of α-Al 2O 3, FeAl 2O 4 and tittle Fe 4 (TiO 4) 3. The ceramic porosity decreases and the bonding strength of the ceramic layer increases quickly with increasing the content of TiO 2; the improvement of ceramic crack failure lies in that the rupture strength is increased and that the tendency of thermal crack formation is diminished.