中文摘要：

分别在1400、1500、1600、1700℃的温度下，于0．9MPa氮气气氛条件下保温3h，对FeSi75硅铁合金粉体进行了氮化实验。研究结果表明：FeSi75合金粉体氮化后产物为Si3N4和Fe3Si，其中1400℃和1500℃氮化产物中的氮化硅为α-Si3N4；1600℃和1700℃氮化产物中的氮化硅为α-Si3N4和β-Si3N4。α-Si3N4的数量随温度升高而减少，β-Si3N4的数量随温度升高而增加。氮化产物si3N4的显微形貌为针柱状和长柱状。

英文摘要：

FeSi75 alloy powder was nitridized in nitrogen gas under the pressure of 0.9 MPa, and respectively at 1400, 1500, 1600 and 1700 ℃ for 3 h. The results showed that the nitridation products consisted of Si3N4 and Fe3Si. α-Si3N4 was produced from FeSi75 by nitriding at 1400 ℃ and 1500 ℃, while α-Si3N4 and β-Si3N4 were produced from FeSi75 by nitriding at 1600 ℃ and 1700 ℃. α-Si3N4 content decreased and β-Si3N4 content increased with the increase of nitriding temperature. The morphology of α-Si3N4 grains was needle-like while that of β-Si3N4 grains was column-like.