本研究将17%Ti N增强α-β Si Al ON复合物在传感器辅助的微波加热系统中进行烧结。探索了Ti N的加入对粉状原料介电性能的影响,以及烧结温度对α-β Si Al ON复合物相变、微观结构演变及其机械性能的影响。结果表明Ti N的加入加强了微...本研究将17%Ti N增强α-β Si Al ON复合物在传感器辅助的微波加热系统中进行烧结。探索了Ti N的加入对粉状原料介电性能的影响,以及烧结温度对α-β Si Al ON复合物相变、微观结构演变及其机械性能的影响。结果表明Ti N的加入加强了微波吸热的效能,这在烧结温度峰值上得到了体现。α∶β比值因此降低了,各项机械性能得到了改善,突出表现在复合物断裂韧性的改善方面。另外,本研究列出了针对实验室微波辅助烧结过程的能量消耗估算数据。最终,本研究确定获得最高相对密度(97.1%)、维氏硬度(13.35±0.47 GPa)以及断裂韧性(7.52±0.54 MPa·m^(1/2))的试验条件为1 300℃下烧结30 min。展开更多
The oxidation behavior of electroconductive TiN/O′-Sialon ceramics prepared using high titania slag as main starting material was studied at 1 200-1 300 °C in air. The isothermal and non-isothermal oxidation pro...The oxidation behavior of electroconductive TiN/O′-Sialon ceramics prepared using high titania slag as main starting material was studied at 1 200-1 300 °C in air. The isothermal and non-isothermal oxidation processes were investigated by DTA-TG. Phase compositions and morphologies of the oxidized products were analyzed by XRD, SEM and EDS. The results indicate that the oxidation of TiN and O′-Sialon occurs at about 500 °C and 1 050 °C, respectively. After oxidation at 1 200-1 300 °C, a protective scale that consists of Fe2MgTi3O10, SiO2 and TiO2 is formed on the surface of the materials, which effectively prevents the oxidation process. The formation of a protective scale is relative to TiN content and apparent porosity of the samples, the amount of SiO2 and amorphous phase in the oxidation product. At the initial oxidation stage, the oxidation kinetics of the materials follows perfectly the linear law with the apparent activation energy of 1.574×105 J/mol, and at the late-mid stage, the oxidation of the samples obeys the parabolic law with the apparent activation energy of 2.693×105 J/mol. With the increase of TiN content, mass gain of the materials increases significantly.展开更多
文摘本研究将17%Ti N增强α-β Si Al ON复合物在传感器辅助的微波加热系统中进行烧结。探索了Ti N的加入对粉状原料介电性能的影响,以及烧结温度对α-β Si Al ON复合物相变、微观结构演变及其机械性能的影响。结果表明Ti N的加入加强了微波吸热的效能,这在烧结温度峰值上得到了体现。α∶β比值因此降低了,各项机械性能得到了改善,突出表现在复合物断裂韧性的改善方面。另外,本研究列出了针对实验室微波辅助烧结过程的能量消耗估算数据。最终,本研究确定获得最高相对密度(97.1%)、维氏硬度(13.35±0.47 GPa)以及断裂韧性(7.52±0.54 MPa·m^(1/2))的试验条件为1 300℃下烧结30 min。
基金Project (2007CB613504) supported by the National Basic Research Program of ChinaProject (20070145041) supported by the Specialized Research Fund for the Doctoral Program of Higher Education, China
文摘The oxidation behavior of electroconductive TiN/O′-Sialon ceramics prepared using high titania slag as main starting material was studied at 1 200-1 300 °C in air. The isothermal and non-isothermal oxidation processes were investigated by DTA-TG. Phase compositions and morphologies of the oxidized products were analyzed by XRD, SEM and EDS. The results indicate that the oxidation of TiN and O′-Sialon occurs at about 500 °C and 1 050 °C, respectively. After oxidation at 1 200-1 300 °C, a protective scale that consists of Fe2MgTi3O10, SiO2 and TiO2 is formed on the surface of the materials, which effectively prevents the oxidation process. The formation of a protective scale is relative to TiN content and apparent porosity of the samples, the amount of SiO2 and amorphous phase in the oxidation product. At the initial oxidation stage, the oxidation kinetics of the materials follows perfectly the linear law with the apparent activation energy of 1.574×105 J/mol, and at the late-mid stage, the oxidation of the samples obeys the parabolic law with the apparent activation energy of 2.693×105 J/mol. With the increase of TiN content, mass gain of the materials increases significantly.
