3 GPa熔融盐固体介质高温高压三轴压力容器的围压标定

 新研制的3 GPa熔融盐固体介质高温高压三轴实验系统，改进了高压容器的装样方式以及样品的尺寸，由于装样部件之间摩擦以及克服传压介质本身的强度，视载围压和真实围压具有较大差异，在完成压力容器温度标定的基础上，采用部分熔融法在不同温度和压力条件下进行围压标定实验研究。实验使用LiCl-KCl混合氯化盐样品，分别在300~1 400 MPa视载围压的条件下，对样品进行缓慢加温，成功观测到实验力学数据和温度数据的同时响应，确定了混合氯化盐的初熔温度，通过已知熔融曲线方程计算得出真实围压。通过比较不同的实验条件和观察实验后装样结构，给出了摩擦力的变化规律：在300~500 MPa压力条件下，摩擦力百分比呈现降低趋势，从52%降低到31.2%；在700~1 200 MPa压力条件下，摩擦力约占11.4%；在1 400 MPa压力条件下，摩擦百分比从11.4%上升到15.5%。通过对比国内外同类实验设备摩擦力认为，该设备真实围压的精度达到了国际同类设备的水平。

Confined Pressure Calibration for 3 GPa Molten Salt Medium Triaxial Pressure Vessel under High Pressure and Temperature

A triaxial deformation apparatus with 3 GPa molten salt medium pressure vessel was developed.It is based on the conventional Griggs design and the molten salt cell concept modified.There is a huge difference between apparent confined pressure and true confined pressure due to the friction in the assembly and the strength of the confined medium under high temperature and pressure.In this study,we used the partially molten method of LiCl-KCl to make the confined pressure calibration on the basis of the temper...