采用碳热还原法,在氩气气氛下1750℃保温1h制备出ZrB2粉体,反应物ZrO2、B2O3和C物质的量比为1:1:10,其中ZrO2以凝胶形式加入,ZrO2凝胶通过NaBH4滴定ZrOCl2溶液制备,C分别以活性炭和炭纤维形式加入,聚乙二醇(PEG)作分散剂,乙醇作为混合介质.用XRD、SEM和EDS分析方法对所得粉体进行了表征.结果表明,用活性炭作为还原剂制备的ZrB2,颗粒细小、均匀,平均粒径在80nm左右,粒子为球形;用炭纤维作为还原剂制备ZrB2粉体,由于炭纤维活性差,反应不彻底.
ZrB2 powder is prepared by the reaction of ZrO2 gel and B2O3 at 1750℃ for 1h with active carbon and carbon fiber as reductants and PEG as dispersant.The reactant ZrO2 gel is obtained from titration of NaBH4 and ZrOCl2.The particles are characterized by XRD,SEM and EDS.It is concluded that uniform ZrB2 particles of 80nm size with spherical structure have been synthesized via active carbon powder,whereas the particles reduced by carbon fiber are ununiform due to unreacted fibers.
参考文献
| [1] | 高瑞兰,于化顺,韩建德,闵光辉,PADERNO Y B.ZrB2含量对LaB6-ZrB2复合材料性能的影响[J].硅酸盐学报,2004(04):507-511,523. |
| [2] | Norasetthekul S;Eubank P T;Bradley W L et al.Use of zirconium diboride-copper as an elect rode in plasma applications[J].Journal of Materials Science,1999,34:1261. |
| [3] | 贾云萍,刘文言,马向东.添加镍粉和二硼化锆防静电涂层的对比研究[J].宇航材料工艺,2004(01):47-49,58. |
| [4] | 方舟,傅正义,王皓,王为民,张清杰.ZrB2陶瓷的制备和烧结[J].中国有色金属学报,2005(11):1699-1704. |
| [5] | S.K. Mishra (Pathak);S. Das .Sintering studies on ultrafine ZrB_2 powder produced by a self-propagating high-temperature synthesis process[J].Journal of Materials Research,2000(11):2499-2504. |
| [6] | 贾全利;张海军;贾晓林 等.溶胶-凝胶微波碳热还原制备二硼化锆粉体[J].材料导报,2007,21(11):65. |
| [7] | Barraud E;Begin C S;Le C G .Nanorods of HfB2 from me chanically-activated HfCl4 and B-based powder mixtures[J].Journal of Alloys and Compounds,2005,398:208. |
| [8] | 方舟,王皓,傅正义.Zr-B体系自蔓延高温合成ZrB2陶瓷粉末[J].硅酸盐学报,2004(08):1016-1018. |
| [9] | 于志强,杨振国.ZrB2-Al2O3复合粉体的自蔓延高温还原合成与表征[J].硅酸盐学报,2005(04):407-410. |
| [10] | Jayaraman S;Gerbi JE;Yang Y;Kim DY;Chatterjee A;Bellon P;Girolami GS;Chevalier JP;Abelson JR .HfB2 and Hf-B-N hard coatings by chemical vapor deposition[J].Surface & Coatings Technology,2006(22/23):6629-6633. |
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