Crystal growth is a complex process,and until now there isn’t a satisfied real t ime observation method.Under the space high temperature in situ observation inst rument(SHITISOI),we develop a three dimensioned real t...Crystal growth is a complex process,and until now there isn’t a satisfied real t ime observation method.Under the space high temperature in situ observation inst rument(SHITISOI),we develop a three dimensioned real time observation device for the crystal.By it,we can acquire image of crystal in three dimension,moreover,i t would provide technique for remote science control in the future space experimen t.We develop the device not only apply to real time observation also adapt to r e mote science research.We use annular quartz glass so as to in situ observe the c hange of interface.And two heater were put its upon and down,thus they form two different temperature zones.We apply to Bridgeman method crystal growth by using special lift to move the quartz crucible.Presently we have developed a pass mus t er furnace, and can get the NaNO 3 crystal.We could observe the fluid flow stat ue and the interface move by tracer particle.We get the effect of unsteady conve ction,which is important both in land and space crystal growth.展开更多
Titanium nitride precipitation on a primary inclusion particle during solidification of bearing steel has been tracked by varying temperature in a confocal scanning violet laser microscope.Upon precipitation,an obviou...Titanium nitride precipitation on a primary inclusion particle during solidification of bearing steel has been tracked by varying temperature in a confocal scanning violet laser microscope.Upon precipitation,an obvious growth of titanium nitride on a primary inclusion particle was observed due to the rapid solute diffusion in liquid steel.The onset of titanium nitride precipitation did not change with primary inclusion particle size,but the time of growth was greater for a smaller primary inclusion particle.Meanwhile,the particle size displayed little influence on the total precipitated amount of titanium nitride on it under the same conditions.At the later period of solidification,almost no change occurred in inclusion size,but the inclusion shape varied from circle to almost square in two-dimension,or cubic in three-dimension,to attain the equilibrium with steel.展开更多
文摘Crystal growth is a complex process,and until now there isn’t a satisfied real t ime observation method.Under the space high temperature in situ observation inst rument(SHITISOI),we develop a three dimensioned real time observation device for the crystal.By it,we can acquire image of crystal in three dimension,moreover,i t would provide technique for remote science control in the future space experimen t.We develop the device not only apply to real time observation also adapt to r e mote science research.We use annular quartz glass so as to in situ observe the c hange of interface.And two heater were put its upon and down,thus they form two different temperature zones.We apply to Bridgeman method crystal growth by using special lift to move the quartz crucible.Presently we have developed a pass mus t er furnace, and can get the NaNO 3 crystal.We could observe the fluid flow stat ue and the interface move by tracer particle.We get the effect of unsteady conve ction,which is important both in land and space crystal growth.
基金the financial support provided by the Key Technology Development of Bearing Steel for Major Equipment of China(No.2012AA03A503)
文摘Titanium nitride precipitation on a primary inclusion particle during solidification of bearing steel has been tracked by varying temperature in a confocal scanning violet laser microscope.Upon precipitation,an obvious growth of titanium nitride on a primary inclusion particle was observed due to the rapid solute diffusion in liquid steel.The onset of titanium nitride precipitation did not change with primary inclusion particle size,but the time of growth was greater for a smaller primary inclusion particle.Meanwhile,the particle size displayed little influence on the total precipitated amount of titanium nitride on it under the same conditions.At the later period of solidification,almost no change occurred in inclusion size,but the inclusion shape varied from circle to almost square in two-dimension,or cubic in three-dimension,to attain the equilibrium with steel.
