固相法制备高纯纳米碳化硼

Synthesis of high purity nano-plated boron carbide powder by solid-state reaction

以聚乙烯醇为碳源,硼酸为硼源,利用固相热反应法制备了高纯度纳米碳化硼(B_4C)粉体,用红外光谱分析、X射线衍射仪、场发射扫描电子显微镜对产物的物相、结构与形貌做了表征,并研究了制备条件对碳化硼粉体的影响。结果表明,将聚乙烯醇与硼酸在250℃以下反应可制备聚合物前驱体;将该聚合物前驱体于750℃低温裂解2 h可以得到裂解前驱体;该裂解前驱体在1 450℃下反应2 h,可得到高纯纳米碳化硼。

Nano-sized boron carbide（B4C） powder with high-purity was synthesized, based on solid-state thermal reaction with polyvinyl alcohol and boric acid.The phase, structure and morphology of the products were characterized by FT-IR, XRD and FE-SEM.Effects of preparation conditions on B4C powder were also studied.Results indicated that the polymer precursor can be prepared after the reaction below 250 %.When the polymer precursor was pyrolyzed at 750 % for 2 h, pyrolyze precursor could be got.High-pure nano-sized B4C powder could be obtained when the as-prepared pyrolyze precursor was treated at 1 450 % for 2 h.