Temperature Determination and Thermal Structure Analysis on the Pressure Assembly of a Piston-Cylinder Apparatus
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摘要: 活塞圆筒是目前使用最广泛的固体介质高温高压装置,样品组装方式和组装件的材料类型决定了高压腔体内部的热结构特征。在0.5、1.0、1.5 GPa压力下、800~1 400 ℃范围内,采用改进的双热电偶法、尖晶石反应测温法对QUICKpress型活塞圆筒的13 mm压力盘的样品组装进行了温度测定,通过获得的实验数据并结合傅里叶热传导模拟结果进行了热结构分析。实验结果表明:(1)热峰位置均位于有效石墨炉中心以下,即靠近钢塞一侧,20 ℃温差范围的热点区轴向分布区域大小介于2.8~5.2 mm,其热梯度为7.7~13.0 ℃/mm,而非热点区热梯度为42~83 ℃/mm;(2)随着温度或压力升高,热峰倾向于朝有效石墨炉中心靠拢,同时伴随着炉内热梯度增大和热点区变小,温度的影响更为显著。还对活塞圆筒压力组装的热结构的影响因素及相关问题进行了探讨。Abstract: Piston-cylinder apparatus is widely used for high-pressure and high-temperature experiments.Its thermal structure in the pressure chamber depends mainly on design and materials of the sample assembly.Here we present a thermal structure analysis on the 13 mm pressure assembly of a QUICKpress piston-cylinder apparatus on the basis of the experimental temperature measurements using the double thermocouple determination, the spinel reaction progress thermometer, and heat conduction simulation by Fourier's law.The temperature measurements were conducted at 0.5 GPa, 1.0 GPa and 1.5 GPa with the control thermocouple in a temperature range of 800-1 400 ℃.The major results are summarized as follows:(1) the hot spot is always located at a position below the midpoint of effective furnace (this means that it is close to the steel base plug); (2) the hot spot region with a temperature variation within 20 ℃ possesses a width of 2.8 mm to 5.2 mm, showing a low thermal gradient of 7.7-13.0 ℃/mm while the region far from hot spot shows a much higher thermal gradient of 42-83 ℃/mm; (3) the position of hot spot moves toward the center or midpoint of effective furnace with pressure or temperature increasing, but the temperature profile is main determined by the temperature of hot spot, with the hot spot region becoming narrower and the thermal gradients for both the hot spot region and the region far from hot spot becoming larger with temperature increasing.On the basis of our experimental and numerical simulation results, effective factors controlling the thermal structure of pressure assembly of a piston-cylinder apparatus and other issues are further discussed.
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图 2 QUICKpress活塞圆筒装置13 mm压力组装热电偶温度测定方法示意图: (a)尖晶石反应温度计法测温实验,dTc=-3 mm,dTr=12 mm;(b)双热电偶测温实验,其中dTc=2 mm,dTr=-2 mm或10 mm(dTr1=-2 mm,dTr2=10 mm);(c)双热电偶测温实验的组装[12], dTc、dTr分别表示中心热电偶和参比热电偶的位置相对于有效石墨炉中心位置的距离
Figure 2. (a) Sample assembly for the experiment of spinel reaction progress thermometer.Tc lies on the position of 3 mm below midpoint of the furnace axis while Tr sits on the position of 12 mm above the midpoint.(b) The assembly of double-TC experiments.Tc is constant on the position (dTc=2 mm) and dTr1=-2 mm and dTr2=10 mm respectively.(c) The assembly of double-TC experiment[12]
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[1] Green D H, Hibberson W O, Kovács I, et al. Water and its influence on the lithosphere-asthenosphere boundary[J]. Nature, 2010, 467(7314): 448-451. doi: 10.1038/nature09369 [2] Boyd F R, England J L. Apparatus for phase equilibrium measurements at pressures up to 50 kilobars and temperatures up to 1750 ℃[J]. J Geophys Res, 1960, 65(2): 741-748. doi: 10.1029/JZ065i002p00741 [3] Watson E B, Wark D A, Price J D, et al. Mapping the thermal structure of solid-media pressure assemblies[J]. Contrib Mineral Petrol, 2002, 142(6): 640-652. doi: 10.1007/s00410-001-0327-4 [4] Kushiro I. Changes in viscosity and structure of melt of NaAlSi3O8 composition at high pressures[J]. J Geophys Res, 1976, 81(35): 6347-6356. doi: 10.1029/JB081i035p06347 [5] Walter M J, Thibault Y, Wei K, et al. Characterizing experimental pressure and temperature conditions in multianvil apparatus[J]. Canad J Phys, 1995, 73(5/6): 273-286. doi: 10.1139/p95-039 [6] Takahashi E. Melting of dry peridotite KLB-1 up to 14 GPa: Implications on the origin of peridotitic upper mantle[J]. J Geophys Res, 1986, 91(B9): 9367-9386. doi: 10.1029/JB091iB09p09367 [7] Walker D, Agee C B. Ureilite compaction[J]. Meteoritics, 1988, 23(1): 81-91. doi: 10.1111/j.1945-5100.1988.tb00899.x [8] Wark D A, Watson E B. Grain-scale channelization of pores due to gradients in temperature or composition of intergranular fluid or melt[J]. J Geophys Res, 2002, 107(B2): 2040-2045. doi: 10.1029/2001JB000365 [9] Walker D, Lesher C E, Hays J F. Soret separation of lunar liquid[J]. Proc Lunar Planet Sci, 1981, 12B: 991-999. http://adsabs.harvard.edu/abs/1982LPSC...12..991W [10] Lesher C E, Walker D. Solution properties of silicate liquids from thermal diffusion experiments[J]. Geochim Cosmochim Ac, 1986, 50: 1397-1411. doi: 10.1016/0016-7037(86)90313-3 [11] Lesher C E, Walker D. Cumulate maturation and melt migration in a temperature gradient[J]. J Geophys Res, 1988, 93(B9): 10295-10311. doi: 10.1029/JB093iB09p10295 [12] Pickering J M, Schwab B E, Johnston A D. Off-center hot spots: Double thermocouple determination of the thermal gradient in a 1.27 cm(1/2 in.)CaF2 piston-cylinder furnace assembly[J]. Am Mineral, 1998, 83(3/4): 228-235. http://pubs.geoscienceworld.org/msa/ammin/article-pdf/83/3-4/228/3613586/228.pdf [13] Watson E B, Wark D A. Diffusion of dissolved SiO2 in H2O at 1 GPa, with implications for mass transport in the crust and upper mantle[J]. Contrib Mineral Petrol, 1997, 130(1): 66-80. doi: 10.1007/s004100050350 [14] Kyser T K, Lesher C E, Walker D. The effects of liquid immiscibility and thermal diffusion on oxygen isotopes in silicate liquids[J]. Contrib Mineral Petrol, 1998, 133(4): 373-381. doi: 10.1007/s004100050459 [15] Yang X S, J Z M, Ernst H, et al. Experimental study on dehydration melting of natural biotite-plagioclase gneiss from high Himalayas and implications for Himalayan crust anatexis[J]. Chin Sci Bullet, 2001, 46(10): 867-871. doi: 10.1007/BF02900441 [16] Richter F M, Watson E B, Mendybaev R A, et al. Magnesium isotope fractionation in silicate melts by chemical and thermal diffusion[J]. Geochim Cosmochim Ac, 2008, 72(1): 206-220. doi: 10.1016/j.gca.2007.10.016 [17] Ding X, Sun W D, Huang F, et al. Different mobility of Nb and Ta along a thermal gradient[J]. Geochim Cosmochim Ac, 2007, 71(15): A226. http://www.irgrid.ac.cn/handle/1471x/339871 [18] Huang F, Lundstrom C. Chemical and isotopic fractionation of wet andesite in a temperature gradient: Experiments and models suggesting a new mechanism of magma differentiation[J]. Geochim Cosmochim Ac, 2009, 73(3): 729-749. doi: 10.1016/j.gca.2008.11.012 [19] Huang F, Chakraborty P, Lundstrom C, et al. Isotope fractionation in silicate melts by thermal diffusion[J]. Nature, 2010, 464(7287): 396-400. doi: 10.1038/nature08840 [20] Ding X, Lundstrom C, Huang F, et al. Natural and experimental constraints on formation of the continental crust based on niobium-tantalum fractionation[J]. Int Geolog Rev, 2009, 51(6): 473-501. doi: 10.1080/00206810902759749 [21] Cohen L H, Ito K, Kennedy G C. Melting and phase relations in an anhydrous basalt to 40 kilobars[J]. Am J Sci, 1967, 265(6): 475-518. doi: 10.2475/ajs.265.6.475 [22] Dunn T. The piston-cylinder apparatus[C]//Luth R W. Experiments at High Pressure and Applications to the Earth's Mantle, MAC Short Course Handbook(Vol. 21). Mineralogical Association of Canada, 1993: 39-94. [23] Hudon P, Baker D R, Toft P B. A high-temperature assembly for 1.91 cm(3/4 in.)piston-cylinder apparatus[J]. Am Mineral, 1994, 79(1/2): 145-147. http://search.ebscohost.com/login.aspx?direct=true&db=aph&AN=9412160397&site=ehost-live [24] 韩亮, 周永胜, 何昌荣, 等. 3 GPa熔融盐固体介质高温高压三轴压力容器的围压标定[J].高压物理学报, 2011, 25(3): 213-220. http://www.cnki.com.cn/Article/CJFDTotal-GYWL200906003.htmHan L, Zhou Y S, He C R, et al. Confined pressure calibration for 3 GPa molten salt medium triaxial pressure vessel under high pressure and temperature[J]. Chinese Journal of High Pressure Physics, 2011, 25(3): 213-220. (in Chinese) http://www.cnki.com.cn/Article/CJFDTotal-GYWL200906003.htm [25] 韩亮, 周永胜, 何昌荣, 等. 3 GPa熔融盐固体介质高温高压三轴压力容器的温度标定[J].高压物理学报, 2009, 23(6): 407-414. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=gywlxb200906002Han L, Zhou Y S, He C R, et al. Temperature calibration for 3 GPa molten salt medium triaxial pressure vessel[J]. Chinese Journal of High Pressure Physics, 2009, 23(6): 407-414. (in Chinese) http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=gywlxb200906002 [26] Nickel K G, Brey G P. Subsolidus orthoproxene-clinopyroxene systematics in the system CaO-MgO-SiO2 to 60 kb: A re-evaluation of the regular solution mode[J]. Contrib Mineral Petrol, 1984, 87(1): 35-42. doi: 10.1007/BF00371400 [27] Schilling F R, Wunder B. Temperature distribution in piston-cylinder assemblies: Numerical simulations and laboratory experiments[J]. Eur J Mineral, 2004, 16(1): 7-14. http://adsabs.harvard.edu/abs/2004EJMin..16....7S [28] Kawashima Y, Yagi T. Temperature distribution in a cylindrical furnace for high-pressure use[J]. Rev Sci Instrum, 1988, 59(7): 1186-1188. doi: 10.1063/1.1139747 [29] 丁兴.俯冲工厂与大陆地壳的形成演化: 来自部分指示性元素活动性及高温高压实验的制约[D].广州: 中国科学院广州地球化学研究所, 2009.Ding X. Subduction factory and formation of the continental crust: Constraints from mobilities of indicative elements and high pressure experiment[D]. Guangzhou: Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 2009. (in Chinese) [30] Watson E B, Price J D. Kinetics of the reaction MgO+Al2O3→MgAl2O4 and Al-Mg interdiffusion in spinel at 1200 to 2000 ℃ and 1.0 to 4.0 GPa[J]. Geochim Cosmochim Ac, 2002, 66(15): 2123-2138. http://www.sciencedirect.com/science/article/pii/S001670370200827X [31] Powell R W, Ho C Y, Liley P E. Thermal conductivity of selected materials, ADD 095251[R]. Washington D C, USA: National Bureau of Standards, 1966.