以富硼渣、硅灰、高铝钒土熟料和碳黑为原料,采用碳热还原氮化法合成了(Ca,Mg)α'-Sialon-AlN-BN陶瓷粉体.采用XRD、SEM和EDX对合成粉体的相组成、显微形貌进行表征分析.研究了合成温度和恒温时间对反应过程的影响,并对合成机理进行了探讨.结果表明:合成温度对粉体的合成过程影响显著,随着温度升高,产物中(Ca,Mg)α'-Sialon相含量增大,1480℃时(Ca,Mg)α'-Sialon含量达最大,是最佳的合成温度.恒温时间对产物相组成的影响也很明显,4h以下,产物含有较多的中间过渡相,较长的恒温时间可使还原氮化反应进行得更充分,恒温8h的试样中α'-Sialon含量最高,是较理想的恒温时间.合成过程中SiO的挥发导致试样较大的质量损失,且随着合成温度升高和恒温时间延长而增大.
参考文献
[1] | Qiu J Y;Tatami J;Zhang C et al.[J].Journal of the Eu-ropean Ceramic Society,2002,22:2989-2996. |
[2] | Van Rutten J w T;Hintzen H T;Metselaar R .[J].Jour-nal of the European Ceramic Society,1996,16:995-999. |
[3] | Hewett CL.;Muddle BC.;Trigg MB.;Cheng YB. .Phase relationships and related microstructural observations in the Ca-Si-Al-O-N system[J].Journal of the American Ceramic Society,1998(7):1781-1788. |
[4] | Yoon SJ.;Jha A. .VAPOUR-PHASE REDUCTION AND THE SYNTHESIS OF BORON-BASED CERAMIC PHASES .2. THE SYNTHESIS OF HEXAGONAL BORON NITRIDE PHASE[J].Journal of Materials Science,1996(9):2265-2277. |
[5] | Arik H;Gunduz M;Saritas S .Production of Si sub 3 N sub 4 by carbothermal reduction and nitridation of sepiolite[J].Journal of Materials Science,1999(4):835-842. |
[6] | Aydogdu A;Sevinc N .[J].Journal of the European Ce-ramic Society,2003,23:3153-3161. |
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