PZT95/5粉体的冲击合成反应机理初探

 采用柱面冲击波回收装置，通过炸药爆轰产生的冲击波作用于Pb₄O₃、ZrO₂和TiO₂混合物粉体以合成PZT95/5粉体。通过对回收粉体进行的X射线衍射（XRD）分析，并结合冲击波理论，从实验和理论两个方面探讨了PZT粉体的合成机理和过程。结果表明，PZT的合成反应与Pb₃O₄的分解反应几乎同时进行，由于冲击波的特殊性，系统的温度和压力能同时满足Pb₃O₄分解和PZT合成的反应热力学条件，由Pb₃O₄分解的PbO一旦形成，就立刻与ZrO₂、TiO₂等氧化物反应生成PZT；冲击波合成PZT粉体属于特殊的固相反应，物质的扩散速度和反应速度大大提高。

Study on the Mechanism of PZT95/5 Powder Synthesis by Shock Waves

A cylinder shock-wave recycling device was used,and via impacting effects of explosive shock waves,PZT95/5 powders were synthesized from a mixture of Pb4O3,ZrO2,and TiO2 oxides.Based on the XRD analyses of recovered powders and shock wave theory,the synthesis mechanism and process of PZT powders are discussed from the experimental and theoretical facets.The results show that PZT synthesis and Pb3O4 decomposition happened simultaneously,because of the shock-wave particularity,the system temperature and pressure could simultaneously satisfy the thermodynamics conditions of Pb3O4 decomposition and PZT synthesizing reactions.Thus once PbO formed by decomposing Pb3O4,PbO would react immediately with ZrO2 and TiO2 oxide compounds to produce PZT.And the reaction of shock-synthesizing PZT powders belonged to the special solid phase reaction,in which the diffusion velocity and reaction speed were enhanced greatly.