氧化铝源对蒙脱石基陶瓷制备及其性能的影响

Effect of Alumina Sources on Preparation and Properties of Montmorillonite-Based Ceramics

以六水氯化铝和氢氧化钠为原料制备羟基铝聚阳离子、羟基铝聚阳离子为氧化铝源制备铝柱撑蒙脱石、氧化铝和氢氧化铝为氧化铝源,分别与蒙脱石球磨,然后分别进行热压制备蒙脱石基陶瓷。研究了不同氧化铝源和热压温度对蒙脱石基陶瓷莫来石化和力学性能的影响。结果表明:当热压温度为1100℃时,3种氧化铝源的加入改善了蒙脱石基陶瓷的力学性能;在1300℃热压温度下,铝柱撑蒙脱石基陶瓷的弯曲强度和断裂韧性最优,分别为118.07 MPa和2.30 MPa·m^(1/2),相对于原蒙脱石基陶瓷分别提高了41.0%和74.2%。

Hydroxy aluminum polycation was firstly prepared with AlCl_(3)·6H_(2)O and NaOH as raw materials,and then Al-pillared montmorillonite was prepared with hydroxy aluminum polycation as alumina source.A montmorillonite-based ceramic was fabricated via ball milling and hot pressing with Al_(2)O_(3) and Al(OH)_(3) as alumina sources.The effect of hot-pressing temperature on the mullitization and mechanical properties of montmorillonite-based ceramic was investigated.The results show that the mechanical properties of montmorillonite-based ceramics are improved by adding three kinds of alumina sources at the hot-pressing temperature of 1100℃.The optimum flexural strength and fracture toughness of Al-pillared montmorillonite-based ceramics at 1300℃(i.e.,118.07 MPa and 2.30 MPa·m^(1/2))can be obtained,which are increased by 41.0%and 74.2%,compared with original montmorillonite ceramics.