Ceramic Paste Formula And Experimental Research

With high strength and hardness,ceramic materials has extensive application which metal and other materials is irreplaceable.However,the fabrication process of most of cerimacs fabricatingis at high temperature,and complicated and costly.Research at room temprature and low temperature fabricatingfacricating ceramic material gradually developed in recent years,because the process is simple and cost effectively which draw much attention.Ceramic paste extrusion fabricatingfabricating is a technique at normal temperature or low temperature and the advantege of this approach is that the paste with high solid content and good rheological properties must be prepared,and the formula has important implication to the fabricating process as well as its physical shape mechanical properties..Therefore,this issue providing a theoretical basis and support for the ceramic paste at normal temperature and low temperature fabricating process through the study of alumina paste formulations,as well as testing the performance of its paste.High solid content of alumina oxigen powder was tested and analyzed through the orthogonal experiment from the three important factors including pH value,adhesives,dispersants.Through the alumina oxigen ceramic paste recipe ingredients granular test density test,viscosity measurements and SEM observation,good extrusion moldability of the paste formulation of alumina oxigen ceramic powder 50% alumina,1% polyethylene glycol,4%glycerol,0.175% hexametaphosphate,6% sodium carrageenan,and 38.825% deionized water acidic paste.Central composite design is used to desigh alumina oxigen ceramic paste formulations experiments with selection of pH,binder carrageenan and sodium hexametaphosphate as dispersant impact factors,response surface modeling analysis by analyzing the satisfaction function and alumina oxigen paste viscosity response surface to obtain optimum viscosity of the ceramic paste formulation parameters.The mathematical model is built between liquid migration and extrusion pressure at the paste extrusion process through freeze-squeeze test liquid paste extrusion determination analysis.And the corresponding experimental validation results show that in the non-continuous extrusion process,the lower the rate of extrusion,liquid migration phenomenon is more obvious.Relative to the extrusion speed,the time intervals during extrusion transfer of the liquid is relatively small.In the case of a certain length of the extrusion head,the same speed,the larger the diameter of the extrusion head,liquid migration phenomenon is more obvious.The research results provide the theoretical foundation for the normal and low temperature ceramics and other similar material fabricating process.