Effect of Silicon Oxynitride Addition on Properties of Anhydrous Gun Mud
Anhydrous gun mud was prepared from experimental materials such as corundum,silicon car-bide,coke powder,alumina,silicon oxynitride(Si2N2O),Guangxi white mud,resin,etc.in appropriate propor-tions.The addition amount of antioxidant Si2N2O was 0-3％.The effect of the change in the amount of antioxi-dant Si2N2O added on the performance of the material at various temperature points was studied.The results indicate that as the amount of antioxidant Si2N2O added increases,the Mach value of material increases,indi-cating a decrease in plasticity.After heating at 300℃,the porosity of the material decreases,the density im-proves,and the strength indicators continue to be optimized.When the material continues to heat up to 1 400℃,the changes in porosity,bulk density and strength indicators of the material are basically consistent with the changes at 300℃.For the hot strength,as the amount of antioxidant Si2N2O added increases,the high-temperature flexural strength of the material also continuously improves.This indicates that the addition of an-tioxidant Si2N2O can improve the oxidation resistance of material and increase the density of the green body.
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