【摘要】 本研究以硼酸和碱式碳酸镁为原料,采用原位合成法制备了硼酸镁晶须,通过热分析(TG)、X射线衍射(XRD)和扫描电子显微镜(SEM)对样品进行表征,考察不同烧结助剂对硼酸镁晶须晶体结构、表面形貌、孔隙率及抗压强度的影响。实验结果表明,当未添加烧结助剂时,孔隙率为62. 57%,抗压强度为10. 32 MPa,晶须直径为0. 2~0. 6μm,长度为3~5μm。添加烧结助剂会降低硼酸镁晶须的孔隙率并提高其抗压强度。当烧结助剂为Mg F2时,孔隙率为51. 77%,抗压强度为14. 51 MPa;当烧结助剂为Na4P2O7时,孔隙率为43. 79%,抗压强度为21. 09 MPa。更多还原

【Abstract】 Mg₂B₂O₅ whiskers were prepared by in-situ synthesis method using H3 BO3 and CH4 MgO6 as raw material. The obtained Mg₂B₂O₅ whiskers were characterized by TG,XRD and SEM. The influence of sintering additives on the crystal structure and compressive strength of Mg₂B₂O₅ whiskers were investigated. The experimental results show that the porosity of Mg₂B₂O₅ whiskers is 62. 57%,the compressive strength of Mg₂B₂O₅ whisker is 10. 32 MPa,the whisker diameter is 0. 2-0. 6 μm,and the length is 3-5 μm when no sintering aid is added. Addition of sintering aids reduces the porosity of magnesium borate whiskers and increases their compressive strength. When the sintering aid is MgF2,the porosity is 51. 77%,and the compressive strength is 14. 51 MPa. The porosity is 43. 79% and the compressive strength is 21. 09 MPa when the sintering aid is Na4 P2 O7.更多还原