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中文摘要：
以闪速燃烧法合成的Fe-Si3N4粉、炭黑和Si3N4粉为原料，按Fe-Si3N4与C及Si3N4与C均为3．5：1的质量比配料，以酚醛树脂为结合剂混练后制成625mm×20mm的试样，经110℃24h干燥后分别在埋炭（石墨）条件下于1300、1450、1500、1550、1600℃保温3h处理后快速水冷，然后将淬冷的试样烘干进行XRD、SEM、EDS检测分析。结果表明：Si3N4-C材料在1500℃时反应形成SiC，1600℃时仍有较多Si3N4存在；而Fe-Si3N4-C材料在1450℃时已形成大量SiC，且1500℃时Si3N4基本都转化为SiC，Fe的存在使其转化速度加快，转化温度降低；Fe-Si3N4中的Fe3Si在C存在条件下，通过形成Fe—Si—C熔体，Fe分解Si3N4并吸纳其中的Si而成为Fe—Si—C系高硅过渡中间相，继而与C反应生成SiC或在熔体中析出SiC晶体，实现K对SiN4向SiC转化的促进作用。
英文摘要：
The flashing combustion synthesized Fe -Si3N4 powder, carbon black and Si3N4 powder were used as starting materials,which were mixed according to 3.5：1 mass ratio of Fe -Si3N4 to C and Si3N4 to C with phenolic resin as binder,and shaped into the specimens with the size of Ф25 mm ×20 mm. The specimens were dried at 110℃for 24 h,carbon（ graphite）-embedded fired at 1 300,1 450,1 500,1 550 and ] 600 ℃ for 3 h,quenched by water,then dried. The specimens were analyzed with XRD,SEM and EDS, etc. The results show that： （1）In Si3N4 -C,the formation temperature of SiC is 1 500 ℃ and there is still a large number of Si3N4 at 1 600 ℃; （2）However,in Fe -Si3N4 -C,a great quantity of SiC forms at 1 450 ℃ and almost total Si3N4 nearly all changes into SiC at 1 500 ℃,and the existence of Fe speeds up the formation of SiC and decreases its formation temperature;（3）Fe in the molten Fe -Si -C formed because of the existence of Fe3Si in Fe -Si3N4 and carbon decomposes Si3N4 into Si and absorbs it forming Fe -Si -C intermediate phase with high Si content, which reacts with carbon forming SiC or precipitates SiC crystal, which realizes that Fe promotes the transformation from Si3N4 to SiC.
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