Synthesis of piezoelectric nanocrystalline PZT powder by stearic acid gel method

PZT nanocrystalline powder was prepared by a stearic acid gel method. Thecrystallization process from the precursor was monitored by infrared spectroscopy, differentialthermal analysis, and thermogravimetric analysis. The nano-sized PZT powder was characterized byX-ray diffraction and transmission electron microscopy. It shows that pure single-phase PZT powdercould be obtained at 450 deg C for 1 h, and the particle size is about 20 nm. With an increase inthe calcination temperature, the PZT crystallite size increased.

变频器、PLC在恒压供水中的应用研究

如今PLC和变频器在恒压供水系统中得到了广泛的使用,通过研究能够看出,恒压供水系统能够保持一个可靠的运行状态,而且这个系统的优势能使管网中的压力保持一个稳定的状态中,实现节能、节省资源的效果。在变频器产生故障之后,也能够实现系统供水,并且也可以做到解除故障之后实现自动启动,所以值得进行推广使用。