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采用不同组分的Zr N、Si_3N_4和Y_2O_3混合粉末,在1 750℃高温固相反应合成Zr N–Si_3N_4–Y_2O_3复合材料,借助于X射线衍射仪表征6种按不同比例混合样品的物相组成。结果表明:在Zr N–Si_3N_4–Y_2O_3三元系统中,Zr N分别与Si_3N_4、Y_2O_3和Y2Si3O3N4(M相,黄长石结构)共存;M相为Si_3N_4和Y_2O_3在摩尔比为1:1时的产物,Zr N–Si_3N_4–Y_2O_3三元系统扩展为Zr N–Si_3N_4–Y_2O_3–Si O2四元系统,在该四元系统中,Zr N分别与M相、Y4Si2N2O7(J相,单斜Y4Al2O9结构)及Y5(Si O4)3N(H相,磷灰石结构)3种含钇硅酸盐及Si_3N_4、Y_2O_3共存。其中,J相和H相分别是Si2N2O(Si_3N_4和Si O2在摩尔比为1:1时的产物)和Y_2O_3在摩尔比分别为2:1和9:5时的产物。用Zr N–Si_3N_4–Y_2O_3体系相图可解析制备Zr N陶瓷和Zr N/Si_3N_4复合陶瓷的相组成。
The Zr N, Si 3 N 4 and Y 2 O 3 powders with different compositions were synthesized by solid-state reaction at 1 750 ℃ and the phase composition of 6 samples were characterized by means of X-ray diffractometer . The results show that ZrN coexists with Si_3N_4, Y_2O_3 and Y2Si3O3N4 (M phase and the yellow feldspar) respectively in the ternary system of ZrN-Si_3N_4-Y_2O_3 ternary system. The M phase is the product of Si_3N_4 and Y_2O_3 with the molar ratio of 1: 1, ZrN-Si_3N_4-Y_2O_3 ternary system is extended to a Zr N-Si_3N_4-Y_2O_3-Si O2 quaternary system, in which ZrN is respectively mixed with M phase, Y4Si2N2O7 (J phase, monoclinic Y4Al2O9 structure) and Y5 (Si O4) 3N (H phase, apatite structure) three kinds of Yttrium silicate and Si_3N_4, Y_2O_3 coexist. Among them, J phase and H phase are the products of Si2N2O (the products of Si3N4 and Si02 when the molar ratio is 1: 1) and Y2O3 are respectively 2: 1 and 9: 5. The phase compositions of Zr N-Si 3 N 4 -Y 2 O 3 system can be used to analyze the phase composition of Zr N ceramics and Zr N / Si 3 N 4 composite ceramics.