High-load, high-temperature deformation apparatus for synthetic and natural silicate melts
High-load, high-temperature deformation apparatus for synthetic and natural silicate melts
复制标题
DOI：
10.1063/1.2751398
复制
发表时间：
2007-07-01
影响因子：
1.6
通讯作者：
Dingwell, D. B.
中科院分区：
文献类型：
--
作者：
Hess, K.-U.;Cordonnier, B.;Dingwell, D. B.
开发了一种独特的高负载、高温单轴压力机，用于测量高达 1050 摄氏度的硅酸盐熔体和岩浆悬浮液的流变性。这种新设备设计用于在恒定应力（高达 300 kN）或恒定应变率（类似于 10(-7) 至 10(0) s(-1)）下运行，并进一步允许我们对高粘度样品进行实验（类似于10(8) 至 10(12) 帕·秒）。该流变仪器代表了一项进步，它可以容纳大量尺寸（最大 790 cm(3)）的均匀加热样品（+/- 2 摄氏度），允许插入热电偶以监测测量过程中的温度分布演变。最后，该装置允许在自然系统常见的应变率和温度下精确测量天然多相材料的粘度。该装置旨在精确地（1）描述非牛顿行为的开始及其随应变率增加直至脆性区域破裂点的演变，（2）限制晶体和气泡对粘度的影响，以及（3）记录通过粘性变形耗散的热量。在这里，我们对 NIST 标准材料 SRM 717a 进行了一系列测量，以校准仪器。我们将通过 Gent 方程确定的粘度与标准材料的经过认证的粘度数据结合起来，以校准这种最先进的设备。这项工作表明，我们可以在 0.06 对数单位内解析大量熔体样品的粘度，并进一步实现高温、高应变率实验中微小粘性耗散的检测。 (C) 2007 年美国物理研究所。
A unique high-load, high-temperature uniaxial press was developed to measure the rheology of silicate melts and magmatic suspensions at temperature up to 1050 degrees C. This new apparatus is designed to operate at constant stresses (up to 300 kN) or constant strain rates (similar to 10(-7) to 10(0) s(-1)) and further allows us to carry on experiments on samples with high viscosities (similar to 10(8) to 10(12) Pa s). The rheological instrument represents an advance in that it accommodates homogeneously heated samples (+/- 2 degrees C) of voluminous sizes (up to 790 cm(3)) which permit the insertion of thermocouples to monitor temperature distribution evolutions during measurements. At last this setup allows for accurate measurements of viscosity of natural multiphase materials at strain rates and temperatures common to natural systems. The apparatus aspires to precisely (1) describe the onset of non-Newtonian behavior and its evolution with increasing strain rate until the point of rupture in the brittle regime, (2) constrain the effect of crystals and bubbles on the viscosity, and (3) record heating dissipated through viscous deformation. Here, we present a series of measurements on NIST standard material SRM 717a to calibrate the instrument. We couple the viscosity determined via Gent's equation with certified viscosity data of the standard material to calibrate this state-of-the-art apparatus. This work shows that we can resolve the viscosity of voluminous melt sample within 0.06 logarithmic unit and furthermore present the detection of minor viscous dissipation for a high-temperature, high strain rate experiment. (C) 2007 American Institute of Physics.