【摘要】 利用多晶硅切割废料,采用燃烧合成的方法成功制备了SiC/Si2N2O及SiC/SiAlON复相粉体材料,并以该粉体为辐射基料制备出高温红外发射涂料。研究了原料配比对产物物相组成和微观形貌的影响,讨论了掺入C粉和Al粉的燃烧反应机理。实验结果表明,当反应剂中SiC∶Si∶C=68∶56∶0(质量比)时,合成产物中的Si2N2O含量最大;当反应剂中SiC∶Si∶C∶Al=68∶53∶24∶21时,合成产物中的SiAlON含量最高,配制成的高温红外涂料的红外发射率数值最高,在2.5～23.5μm波段范围内达到了0.92。更多还原

【Abstract】 SiC/Si2N2O and SiC/SiAlON composite material powders were successfully synthesized by combustion synthesis using kerf loss silicon as reactant,and high-temperature infrared emission coating were prepared utilizing these combustion products.Effects of the ratio of raw materials on the phase composition and microstructure of combustion products were investigated.Meanwhile,combustion mechanisms of raw materials including carbon and aluminium were discussed.The results showed that Si2N2O had the maximum content in the powder products when the mass ratio of the raw materials SiC∶ Si∶ C was 68∶ 56∶ 0.However,as SiC∶ Si∶ C∶ Al was 68∶ 53∶ 24∶ 21,the content of SiAlON in the last products reached maximum,and the high-temperature infrared emission coating prepared with these powders had the highest infrared emissivity of 0.92 in the wavelength range of 2.5-23.5 μm.更多还原