CAJ | 학술논문

由于新研制的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,需要对新装置的压力容器进行温度标定,为此采用多个NiCr-NiSi热电偶,在围压为0.5 GPa时对样品内部和周围的温度分布进行了研究.实验结果表明,样品外侧相对于样品中心上1/3位置热电偶监测到的温度与其它位置监测到的温度之间具有良好的线性关系,它们之问的斜率大小可以直接反映出温度的高低.样品外侧相对于样品中心上1/3位置与下1/3位置监测温度基本相同,也可以作为实验控制温度;样品中心温度比样品外侧相对于样品中心上1/3位置和下1/3位置监测温度低4%;样品底部温度比样品中心温度低5%;样品内部相对于样品中心下1/4位置温度比样品中心低2%.样品的温度从中问向两端对称式递减,在样品尺寸范围内,样品的垂直温度梯度恒定(900℃为16℃/mm).本设备样品温度分布和温度控制精度与国际同类型实验设备相类似,达到了国际同类设备的水平.
유우신연제적3 GPa용융염고체개질고온고압삼축실험계통개진료고압용기적장양방식이급양품적척촌,수요대신장치적압력용기진행온도표정,위차채용다개NiCr-NiSi열전우,재위압위0.5 GPa시대양품내부화주위적온도분포진행료연구.실험결과표명,양품외측상대우양품중심상1/3위치열전우감측도적온도여기타위치감측도적온도지간구유량호적선성관계,타문지문적사솔대소가이직접반영출온도적고저.양품외측상대우양품중심상1/3위치여하1/3위치감측온도기본상동,야가이작위실험공제온도;양품중심온도비양품외측상대우양품중심상1/3위치화하1/3위치감측온도저4%;양품저부온도비양품중심온도저5%;양품내부상대우양품중심하1/4위치온도비양품중심저2%.양품적온도종중문향량단대칭식체감,재양품척촌범위내,양품적수직온도제도항정(900℃위16℃/mm).본설비양품온도분포화온도공제정도여국제동류형실험설비상유사,체도료국제동류설비적수평.
A triaxial deformation apparatus with 3 GPa molten salt medium pressure vessel was developed to study the mechanical behavior of the rock under high temperature and ultra-high pressure. It is based on the conventional Griggs design and the molten salt cell concept is after the concept of Green and Borch(1989) and Rybacki et a1(1998). The pressure vessel is improved with respect to systems described previously by the use of different salt mixtures with low eutectic temperatures, and by a mechanically stable arrangement of the thermocouples. In this study, we focus on the temperatures distribution around the sample under confined pressure of 500 MPa. The experimental results show that there is a good linear correlation between temperatures monitored by the upper thermocouple (at the upper 1/3 position of the sample center,outside the sample) and others. Based on the linear slopes, we can identify temperature difference in positions of sample. The temperature difference between the upper and the lower thermocouple (at the lower 1/3 positon of the sample center,outside the sample) is so small that both of them can be used as temperature controller for the heating system. The temperature in the center of the sample is by 4% lower than the ones monitored by the upper thermocouple. The temperature in the bottom of the sample is by 5% lower than that in the center of the sample. The temperature in the lower quarter of the sample is by 2% lower than that in the center of the sample. The temperature distribution in the sample show that vertical temperature gradient in the sample is constant(16℃/mm at 900℃). The temperature controlling resolution and temperature distribution in the pressure vessel are similar to the same type apparatuses in other laboratories of the world.