镁热还原法制备超微细无定形硼粉

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1、镁热还原法制备超微细无定形硼粉镁热还原法制备超微细无定形硼粉镁热还原法制备超微细无定形硼粉镁热还原法制备超微细无定形硼粉镁热还原法制备超微细无定形硼粉镁热还原法制备超微细无定形硼粉镁热还原法制备超微细无定形硼粉镁热还原法制备超微细无定形硼粉镁热还原法制备超微细无定形硼粉镁热还原法制备超微细无定形硼粉镁热还原法制备超微细无定形硼粉第l7卷第l2期Vo1.17NO.12中国有色金属TheChineseJournalofNonferrousMetals2007年l2月Dec.2oo7文章编号:1004—0609(2007)12—2034.06镁热还原法制备超微细无定形硼粉伍继君

2、,马文会,张广立2翟玉春,杨斌,戴永年(1.昆明理工大学真空冶金国家工程实验室,材料与冶金工程学院,昆明650093;2.东北大学材料冶金学院,沈阳l100041摘要:以B2O3为原料,Mg粉为还原剂,通过自蔓延镁热还原反应获得还原产物,经过对还原产物的盐酸溶浸后,制备出超微细无定形硼粉.研究镁热还原工艺对产物的影响,利用激光粒度分析仪测定无定形硼粉的粒径,用静态表面吸附仪测定77-3K下硼粉的氮吸附等温曲线,通过XRD和SEM分别对还原产物和无定形硼粉的物相及形貌进行分析.结果表明:在B2O3一Mg体系中,影响硼粉纯度的杂质主要是反应过程中生成的酸不溶物MgBx,O,M

3、g2SiO4,FeBx及较难溶物xMgO?B2O3等,在镁热还原过程中应尽量抑制该类化合物的生成.通过优化制备工艺,在rv(B203)/w(Mg)为3.0的条件下,制备出硼含量为94.6%,比表面积8.2m2/g,等效粒径O.36um的形貌不规则的超微细硼粉.关键词:无定形硼粉;超微细;镁热还原法:比表面积;富燃料推进剂中图分类号:TF123.12文献标识码:APreparationofultra-fineamorphousboronpowderbymagnesiothermicreductionWUJi-jun,MAWen-hui,ZHANGGuang-li,ZHA1Y

4、u.chun2,YANGBin,DA1Yong.nian(1.ScienceandTechnologyStateKeyLaboratoryofVacuumMetallurgy,FacultyofMaterialsandMetallurgicalEngineering,KunmingUniversityofTechnology,Kunming650093,China;2.SchoolofMaterialsandMetallurgy,NortheasternUniversity,Shenyang110004,China)Abstract:B203andMgpowderswer

5、eusedasrawmaterialsandreductantrespectively.Thereductiveproductswerepreparedbythemagnesiothermicreaction.TheboronpowderswereobtainedafterthereductiveproductswereleachedbyHCI.Theeffectsofreductivetechniquesonproductsweresystematicallystudied.Theparticlesizesofboronpowdersweremeasuredbylase

6、rparticleanalyzerandstaticvolumetricabsorptionanalyzerat77.3K.ThephasesandmorphologyofthereductiveproductsandboronpowderswerecharacterizedbyXRDandSEM.TheresultsshowthatthemaineffectsonthepurityofboronpowdersaretheinsolublematterMg,BxO,Mg2SiO4,FeBandxMgO?B203.Sothesecompoundsmustbeeffectiv

7、elyrestrainedintheprocessofmagnesiothermicreduction.Theirregularultra-freeamorphousboronpowderwithpurityof94.6%,specificsurfaceareaof8.2m2/gandequivalentparticlesizeof0.36mCanbegoaenwhenw(B203)/w(Mg)(ratioofmassfraction)is3.0.Keywords:amorphousboronpowder;ultra-fine