热线:400-1626586
关于我们

压电常数的测试条件与测试方法

<p style="margin: 0px; padding: 0px; color: #333333; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; background-color: #ffffff;"><span style="font-size: 14pt;"><span style="font-family: 宋体;">由压电方程知,压电材料常数有介电常数ε</span><sub><span style="font-family: 宋体;">ij</span></sub><sup><span style="font-family: 宋体;">T</span></sup> <span style="font-family: 宋体;">、ε</span><sub><span style="font-family: 宋体;">ij</span></sub><sup><span style="font-family: 宋体;">s</span></sup><span style="font-family: 宋体;">,介电隔离率β</span><sub><span style="font-family: 宋体;">ij</span></sub><sup><span style="font-family: 宋体;">T</span></sup><span style="font-family: 宋体;">,β</span><sub><span style="font-family: 宋体;">ij</span></sub><sup><span style="font-family: 宋体;">s</span></sup><span style="font-family: 宋体;">,弹性柔顺系数s</span><sub><span style="font-family: 宋体;">ij</span></sub><sup><span style="font-family: 宋体;">E</span></sup><span style="font-family: 宋体;">、S</span><sub><span style="font-family: 宋体;">ij</span></sub><sup><span style="font-family: 宋体;">D</span></sup><span style="font-family: 宋体;">,弹性刚度常数C</span><sub><span style="font-family: 宋体;">ij</span></sub><sup><span style="font-family: 宋体;">D</span></sup><span style="font-family: 宋体;">和C</span><sub><span style="font-family: 宋体;">ij</span></sub><sup><span style="font-family: 宋体;">E</span></sup><span style="font-family: 宋体;">,以及压电应变常数d,<a title="压电常数测试(D33)" href="https://www.kexingtest.com/instrument/detail?id=209" target="_blank" rel="noopener">压电电压常数</a>g、压电应力常数e和压电劲度常数h等。不同常数需采用不同的振子模式,各种常数的测量方法也就不同,因此,本部分无法包揽这些众多常数的测试方法,下面仅以常常用到的纵向压电应变常数d</span><sub><span style="font-family: 宋体;">33</span></sub><span style="font-family: 宋体;">的准静态测试(GB/T11309-1989)为例给出压电材料常数测试的基本概念。</span></span></p> <p style="margin: 0px; padding: 0px; color: #333333; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; background-color: #ffffff;"> </p> <p style="margin: 0px; padding: 0px; color: #333333; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; background-color: #ffffff;"><span style="font-size: 14pt;"><span style="font-family: 宋体;">准静态d</span><sub><span style="font-family: 宋体;">33</span></sub><span style="font-family: 宋体;">测试设备的测量范围在(10~1000)×10</span><sup><span style="font-family: 宋体;">-12</span></sup> <span style="font-family: 宋体;">C/N,在整个测量范围内测量精度优于(±2%±1个数字)。交变力频率范围:20~200Hz;交变力幅率范围:0.1~0.4N。</span></span></p> <p style="margin: 0px; padding: 0px; color: #333333; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; background-color: #ffffff;"> </p> <p style="margin: 0px; padding: 0px; color: #333333; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; background-color: #ffffff;"><span style="font-size: 14pt;"><span style="font-family: 宋体;">要求在试样的两个主平面上被覆金属层作为电极,沿厚度方向进行极化处理。一般情况下试样质量小于100g,试样电容小于0.01μF,形状不限。推荐仲裁试样尺寸:10×5mm。</span></span></p> <p style="margin: 0px; padding: 0px; color: #333333; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; background-color: #ffffff;"> </p> <p style="margin: 0px; padding: 0px; color: #333333; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; background-color: #ffffff;"><span style="font-size: 14pt;"><span style="font-family: 宋体;">试样应保持清洁、干燥,根据不同瓷料要求,极化后存放一定时间,并在规定的环境条件放置2h后进行测试。一般测试频率为100Hz。</span></span></p> <p style="margin: 0px; padding: 0px; color: #333333; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; background-color: #ffffff;"> </p> <p style="margin: 0px; padding: 0px; color: #333333; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; background-color: #ffffff;"><span style="font-size: 14pt;"><span style="font-family: 宋体;">测试设备,试样按条件准备好后开始测试。首先,仪器接通电源,预热、调零后,将被测试样置于探头之间,选择适当的静压力,数字表显示的稳定读数就是该试样的准静态d</span><sub><span style="font-family: 宋体;">33</span></sub><span style="font-family: 宋体;">值,读数前面的符号即试样上电极面或下电极面施加压应力时的极性。</span></span></p> <p style="margin: 0px; padding: 0px; color: #333333; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; background-color: #ffffff;"> </p>