磁驱动加载装置负载区降温系统设计及应用

Design and application of cooling system in loading area of magnetically driving device

在材料物性研究中,压力和温度是两个基础的物理量,国内磁驱动加载装置具有压力调节能力,暂不具备样品降温控制技术,针对这一现状设计了一套配合磁驱动加载装置负载区的样品初始降温系统,结合设计的电极板结构和测试探针工装,使负载区电极板与样品、样品与探针固定于设定位置;通过往电极板和探针工装形成的密闭气室内注入压缩低温液氮达到对样品降温的目的;通过真空泵,抽出电极板和探针工装形成的密闭气室内的空气,避免测速探针由于低温凝结空气中的水汽而无法工作。基于该系统开展了低温下铋的斜波压缩实验,获得了−80℃初始温度下铋的动力学响应数据,验证了降温系统的可靠性。

Pressure and temperature are two of the most critical factors in the study of material properties.The magnetically driving device has the ability of pressure regulation,but does not have the sample cooling control technology temporarily in our country.Therefore,a set of cooling system matching with the loading area of the magnetically driving device is designed.Combined with the designed electrode plate structure and the test probe,the electrode plate and the probe in the load area are fixed in the right position.The purpose of cooling the sample is achieved by injecting compressed low-temperature liquid nitrogen into the closed gas chamber formed by the electrode plate and the probe tooling.Through the vacuum pump,the air in the closed air chamber formed by the electrode plate and the probe tooling is extracted to avoid failure of the velocity measuring probe due to the water vapor in the lowtemperature condensed air.Based on the system,the ramp wave compression experiment of bismuth at low temperature is carried out,and the dynamic response data of bismuth at the initial temperature of−80℃are obtained,which verifies the reliability of the cooling system.