CAJ | 학술논문

机械活化后的Si粉加入发泡剂溶液,搅拌、烘干后得到多孔预制坯体.将坯体在流动氮气氛中引发燃烧合成反应.通过调整原料粉体机械活化时间及预制坯体中稀释剂的含量,制得了不同粒径和长径比的氮化硅粉体.利用XRD和SEM对产物的主要成分和形貌进行了表征.实验结果表明,通过发泡法燃烧合成可制备长径比可控、晶粒发育完全的氮化硅粉体.与传统燃烧合成制备的氮化硅粉体相比,发泡法制备的氮化硅粉体结晶度高,形貌均一性好.
궤계활화후적Si분가입발포제용액,교반、홍간후득도다공예제배체.장배체재류동담기분중인발연소합성반응.통과조정원료분체궤계활화시간급예제배체중희석제적함량,제득료불동립경화장경비적담화규분체.이용XRD화SEM대산물적주요성분화형모진행료표정.실험결과표명,통과발포법연소합성가제비장경비가공、정립발육완전적담화규분체.여전통연소합성제비적담화규분체상비,발포법제비적담화규분체결정도고,형모균일성호.
Mechanically activated silicon powders were added to solution with AM/MBAM system and foaming agent. Porous green body with certain strength was attained after stirring and drying. SHS reaction was ignited in N_2 flow to prepareβ-Si_3N_4. Through controlling mechanical activation time and thinner concentration, β-Si_3N_4 powders of different sizes and length/radius ratio were obtained. The product was examined by XRD and SEM, whose results illustrate that foaming SHS is effective in preparing full-grown β-Si_3N_4 particles with controllable length/radius ratio. Compared with β-Si_3N_4 powders by common SHS, the powders by foaming SHS have better crystallinity and morphological homogeneity.