By the method of TG-DSC(thermo gravimetric analysis -differential scanning calorimeter) , the chemical reactions of Fe-Si3 N4 bonded SiC during the sintering process in nitriding furnace have been studied. Analyses ha...By the method of TG-DSC(thermo gravimetric analysis -differential scanning calorimeter) , the chemical reactions of Fe-Si3 N4 bonded SiC during the sintering process in nitriding furnace have been studied. Analyses have been conducted on the reason of disintegration of specimens when ferro-silicon was added greater than 15% and on the method to reduce damage. The result indicated that there are mainly three important reactions occurred during the nitriding process of samples, they are: the oxidation of carbon, the melting of ferro-silicon and the nitriding of ferro -silicon. Controlling the balance of partial pressure of N2 and slowing down the rate of temperature rising can reduce the disintegration of samples .展开更多
The refractory raw materials used in recent years were introduced,including metal and intermetallic compounds（ aluminum,silicon,ferrosilicon,etc.）,nonoxide raw materials（ Si3N4 and ferrosilicon nitride）.The develo...The refractory raw materials used in recent years were introduced,including metal and intermetallic compounds（ aluminum,silicon,ferrosilicon,etc.）,nonoxide raw materials（ Si3N4 and ferrosilicon nitride）.The developmental tendency of China＇s raw refractories in the future was also discussed.展开更多
文摘By the method of TG-DSC(thermo gravimetric analysis -differential scanning calorimeter) , the chemical reactions of Fe-Si3 N4 bonded SiC during the sintering process in nitriding furnace have been studied. Analyses have been conducted on the reason of disintegration of specimens when ferro-silicon was added greater than 15% and on the method to reduce damage. The result indicated that there are mainly three important reactions occurred during the nitriding process of samples, they are: the oxidation of carbon, the melting of ferro-silicon and the nitriding of ferro -silicon. Controlling the balance of partial pressure of N2 and slowing down the rate of temperature rising can reduce the disintegration of samples .
文摘The refractory raw materials used in recent years were introduced,including metal and intermetallic compounds（ aluminum,silicon,ferrosilicon,etc.）,nonoxide raw materials（ Si3N4 and ferrosilicon nitride）.The developmental tendency of China＇s raw refractories in the future was also discussed.
