Application Of Containerless Technology In The Preparation And Thermophysical Properties Testing Of Oxide Glass Containing Titanium

With the continued global focus on materials research and development and environmental issues,in the exploration of new materials and the treatment of blast furnace slag,the study of their thermophysical properties in high temperature environments has become the focus of research by scholars.The majority of current measurements of density,viscosity and surface tension of high temperature melts are contact,which can contaminate the melt or change the structure of the melt in contact with the vessel wall in high temperature environments,leading to inaccurate measurement results and accelerating the development of containerless suspension technology.Aerodynamic levitation is one of the vessel-free technologies.The gas levitation devices in China are currently unable to perform density,viscosity and surface tension tests,while the foreign equipment is more expensive.Therefore,it is necessary to develop a device that can test the thermal properties of high temperature oxides independently developed in China,and using the same pneumatic suspension heating method to prepare low SiO₂ content SiO₂-TiO₂-SrO glass,and further explore and develop polar glass-ceramics materials with excellent performance through the regulation of heat treatment conditions.The main studies are:（1）Based on the pneumatic suspension device built by the research group,the equipment was reformed and an Aerodynamic Levitation laser heating device for testing the thermal physical properties was successfully built,which can be used to test the density,viscosity and surface tension of high-temperature melt.（2）The LaO_3/2-TiO₂ system was synthesized by the Aerodynamic Levitation laser heating method,and the pneumatic suspension thermal property testing device was set up and commissioned,and the density,viscosity and surface tension of the LaO_3/2-TiO₂ melt were successfully tested at 1400～1800°C after extensive experimental investigation and exploration.Conclusions drawn that the viscosity of the melt did not change linearly with temperature;A comparative analysis of the four selected glass fractions at the same temperature showed that the viscosity of the 30.8LaO_3/2-69.2TiO₂ melt was the largest,and the viscosity of the components closer to the eutectic point increases.The high-temperature density of LaO_3/2-TiO₂Glass melt decreases with the increase of temperature;As LaO_3/2 increases,the Density of the melt shows an increasing trend,and the change in density with temperature is not linear.The segmented fitting effect is more appropriate in the areas below and above the melting point.Comparing the surface tension data of four glass components,it was found that the closer the component is to the eutectic point,the greater the surface tension.（3）The preparation of SiO₂-TiO₂-SrO glass with low SiO₂ content was carried out by the Aerodynamic Levitation laser heating method,and micro-crystallization treatment was carried out through the exploration of subsequent heat treatment conditions.Through the analysis of ferroelectric domains and electric hysteresis loops of a series of glass-ceramics,it was found that they all have weak piezoelectric properties,so as to obtain a series of glass-ceramics with certain piezoelectric properties;and it is expected to be applied in electronic devices.