Si2N2O powder was synthesized by car-bothermal reduction and nitridation natural quartz powder. At the same time, the effects of the process parameters such as SiO2/C ratio, temperature and time on the compositions of...Si2N2O powder was synthesized by car-bothermal reduction and nitridation natural quartz powder. At the same time, the effects of the process parameters such as SiO2/C ratio, temperature and time on the compositions of products were analysed. It is found that the compositions of products depend closely on the parameters mentioned above, and that the product containing higher Si2N2O phase could be obtained by choosing suitable process parameters.展开更多
Si2N2O ceramics were prepared using amorphous Si3N4 as the raw material and Li2CO3 as the sintering additive through vacuum multi-stage sintering.The influence of the Li2CO3 addition(0%,1%,2%,3%,and 5%,by mass)on the ...Si2N2O ceramics were prepared using amorphous Si3N4 as the raw material and Li2CO3 as the sintering additive through vacuum multi-stage sintering.The influence of the Li2CO3 addition(0%,1%,2%,3%,and 5%,by mass)on the phase composition,the microstructure,the porosity,the mechanical properties,the dielectric constant and the tangent of the dielectric loss angle of the porous Si2N2O ceramics was investigated.The results reveal that a suitable addition of Li2CO3 can promote the generation of Si2N2O but excessive or inadequate Li2CO3 causes decomposition of Si2N2O ceramics.The prepared porous Si2N2O ceramics have good mechanical properties,good thermal shock resistance,and low dielectric properties,which have excellent potential for application in microwave sintering furnaces.展开更多
文摘Si2N2O powder was synthesized by car-bothermal reduction and nitridation natural quartz powder. At the same time, the effects of the process parameters such as SiO2/C ratio, temperature and time on the compositions of products were analysed. It is found that the compositions of products depend closely on the parameters mentioned above, and that the product containing higher Si2N2O phase could be obtained by choosing suitable process parameters.
基金The authors would like to thank the National Key R&D Program of China(2017YFB0304000)National Natural Science Foundation of China(51932008,51772277)Central China Thousand Talents Project(2042005100111).
文摘Si2N2O ceramics were prepared using amorphous Si3N4 as the raw material and Li2CO3 as the sintering additive through vacuum multi-stage sintering.The influence of the Li2CO3 addition(0%,1%,2%,3%,and 5%,by mass)on the phase composition,the microstructure,the porosity,the mechanical properties,the dielectric constant and the tangent of the dielectric loss angle of the porous Si2N2O ceramics was investigated.The results reveal that a suitable addition of Li2CO3 can promote the generation of Si2N2O but excessive or inadequate Li2CO3 causes decomposition of Si2N2O ceramics.The prepared porous Si2N2O ceramics have good mechanical properties,good thermal shock resistance,and low dielectric properties,which have excellent potential for application in microwave sintering furnaces.
