催化氮化反应Si_3N_4增强SiC基复相耐高温材料的研究
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摘要
为解决Si_3N_4结合SiC复相材料氮化不完全产生"黑心"/"夹心"以及强度有待提高的问题,本文在探讨Fe、Co、Ni等催化剂对Si粉催化氮化过程的基础上,研究了催化剂Co的加入对原位催化Si粉氮化反应形成Si_3N_4结合SiC复相耐高温材料的物理性能与显微结构特征的影响。结果表明:催化剂Fe、Co、Ni能够有效促进Si粉的氮化以及Si_3N_4纤维的形成,同时能够降低氮化反应的温度。1400℃氮化烧结后,当Co加入量为0.5wt.%时催化氮化制备的Si_3N_4结合SiC复相材料的强度达到最大60.2 MPa,比未添加Co的提高了88.7%,可能是由于形成了大量的纤维网络结构强化了SiC基质。
In order to solve the problems of Si_3N_4 bonded SiC composites,i.e.,incomplete nitridation resulted in"black heart"/"sandwich"and the strength needed to be improved,in this work,the catalytic nitriding process of silicon powder with the catalyst of Fe,Co and Ni was firstly investigated.Then the effect of Co catalyst on the physical properties and microstructure characteristics of Si_3N_4 bonded SiC composites were investigated.The results showed that the catalysts of Fe,Co and Ni effectively promoted the nitridation of Si powder and the formation of Si_3N_4 fibers,and reduced the reaction temperature.After nitridation sintering at 1400°C,the as-prepared Si_3N_4-SiC composites had the highest strength of 60.2 MPa when the Co content was 0.5wt.%,88.7%higher than that without Co.It may result from the formation of a fiber network structure,thus strengthening the SiC matrix.
In order to solve the problems of Si_3N_4 bonded SiC composites,i.e.,incomplete nitridation resulted in"black heart"/"sandwich"and the strength needed to be improved,in this work,the catalytic nitriding process of silicon powder with the catalyst of Fe,Co and Ni was firstly investigated.Then the effect of Co catalyst on the physical properties and microstructure characteristics of Si_3N_4 bonded SiC composites were investigated.The results showed that the catalysts of Fe,Co and Ni effectively promoted the nitridation of Si powder and the formation of Si_3N_4 fibers,and reduced the reaction temperature.After nitridation sintering at 1400°C,the as-prepared Si_3N_4-SiC composites had the highest strength of 60.2 MPa when the Co content was 0.5wt.%,88.7%higher than that without Co.It may result from the formation of a fiber network structure,thus strengthening the SiC matrix.
引文
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[4]Sopicka-Lizer M.,Tańcula M.,W?odek T.,et al.The effect of mechanical activation on the properties ofβ-Sialon precursors,J.Euro.Ceram.Soc.,2008,28:279–288.
[5]Riley F L.Silicon Nitride and Related Materials.J.Am.Ceram.Soc.,2000,83(2):245–265.
[6]Mizuno H,Koyama H,Koshida N.Oxide-free blue photoluminescence from photochemically etched porous silicon.Appl.Phys.Lett.,1996,69,3779.
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[8]Boyer S M,Sang D,Moulson A J,Nitrogen Ceramics.Edited by F.L.Riley(Noodhoff,Leyden,)1977,297.