高强度粗颗粒金刚石的合成技术研究     

王松顺  王民 《煤田地质与勘探》1992,20(2):68-70,F003

在高温高压下,六方晶格的石墨转变为立方晶格的金刚石。选用灰分含量少、气孔分布均匀的T621A石墨为碳源,选择化学成分范围偏值小、杂质含量少的镍锰钴合金为触媒以及优质粉压叶腊石为传压介质,在高温、适压、长时间及其它条件下,合成高强度粗颗粒的优质金刚石取得了良好的效果。  相似文献   

Thermal analysis in the laser-heated diamond anvil cell     

Jeffrey S. Sweeney  Dion L. Heinz 《Pure and Applied Geophysics》1993,141(2-4):497-507

A new technique actively controls thermal radiation and monitors sample properties during laser-heating in a diamond anvil cell. The technique can be described as a qualitative application of thermal analysis. Discontinuities in temperature, laser power, visible thermal radiation, or in their derivatives as functions of time can be associated with the enthalpy of phase transitions (such as melting) or with changes in maternal properties (such as emissivity).The technique is illustrated with melting experiments on iron-magnesium-silicate perovskite. Temperature corrections associated with these experiments are discussed and the results are briefly reviewed.  相似文献   

风城碱性杂岩与有关含金刚石岩类对比的意义     

冉清昌  刘学珍 《吉林大学学报(地球科学版)》1993,(3)

迄今为止,对金刚石矿床的研究已取得了新的进展,国内外学音认为:“金伯利岩不是金刚石矿床的唯一母岩”,并且在碱性杂岩体中发现了许多具有工业价值的金刚石矿床。 通过对比辽宁凤城碱性杂岩与有关含金刚石矿床母岩(主要是钾镁煌斑岩)及其共生岩类的构造背景、岩石类型组合、矿物成分组合及岩石的主元素、微量元素和稀土元素特征,发现本区碱性杂岩体岩石与西澳钾镁煌斑岩很相似,尤其是与西澳白榴石钾镁煌斑岩最为接近,而在岩石类型和矿物组合特点上,又与美国阿肯色碱性岩区金刚石矿床母岩及其共生岩类组合颇为相似,这为我们进一步找寻金刚石矿床提供某些有益的信息。  相似文献   

SAINF: A toolbox for analyzing the effect of point-like,line-like and polygon-like infrastructural features on the distribution of point-like non-infrastructural features     

Atsuyuki?OkabeEmail author  Tohru?Yoshikawa 《Journal of Geographical Systems》2003,5(4):407-413

This paper introduces a GIS-based toolbox, called SAINF, for analyzing the effects of infrastructural features on the distribution of non-infrastructural features. One of the distinct characteristics of SAINF is that it can deal not only with point-like infrastructural features but also line-like (e.g. railways) and polygon-like (e.g. big parks) features. SAINF analyzes these effects with the conditional nearest neighbor distance method and the cross K-function method. First, the paper briefly refers to these methods. Second, the paper illustrates how to use SAINF with an actual example. SAINF can be downloaded via the Internet without charge for non-profit uses.We express our thanks to Exceed Co. Ltd. for helping us program SAINF, and to Miki Arimoto for making the data of high-class apartment buildings and parks in Kiba. This development was partly supported by Grant-in-aid for Scientific Research No. 10202201 (Spatial information science for human and social sciences) and No. 14350327 (Regional supporting network planning for the elderly) by the Ministry of Education, Culture, Sports, Science and Technology of Japan.  相似文献   

On the Structure of Symplectic Mappings. The Fast Lyapunov Indicator: a Very Sensitive Tool     

Claude Froeschlé  Elena Lega 《Celestial Mechanics and Dynamical Astronomy》2000,78(1-4):167-195

It is already known (Froeschlé, Lega and Gonczi, 1997) that the Fast Lyapunov Indicator (FLI), that is the computation on a relatively short time of the largest Lyapunov indicator, allows to discriminate between ordered and weak chaotic motion. We have found that, under certain conditions, the FLI also discriminates between resonant and non-resonant orbits, not only for two-dimensional symplectic mappings but also for higher dimensional ones. Using this indicator, we present an example of the Arnold web detection for four and six-dimensional symplectic maps. We show that this method allows to detect the global transition of the system from an exponentially stable Nekhoroshevs like regime to the diffusive Chirikovs one.  相似文献   

聚晶金刚石取心钻头的研究与应用     

王永丰  孙文洁 《中国煤田地质》2007,19(A01):3-4

煤田勘探中存在大硬度、弱研磨性、高胶结强度地层的低钻效问题，为此进行了聚晶金刚石取心钻头的研制。该聚晶钻头底唇设计为阶梯状，水口不超过8个，聚晶在底唇上采用抛物线布局。聚品金刚石取心钻头经与PDC钻头、金刚石钻头对比，其在大部分地层磨损正常，钻效有较大提高。  相似文献   

粉末冶金在探矿工程中的应用   总被引：1，自引：1，他引：0       下载免费PDF全文

丁华东  马明亮  杨晓华  浩宏奇  金志浩 《探矿工程》1998,(1):43-45

介绍了粉末冶金技术及产品在探矿工程中的应用,回顾了硬质合金钻进的历史;讨论了粉末冶金技术在金刚石钻头制造中的应用,尤其是近几年的进展,综述了钎头用硬质合材料新发展－梯度硬质合金和铁镍代钴硬质合金。  相似文献   

金刚石钻头制造的新型模具材料及模具成型工艺   总被引：1，自引：0，他引：1       下载免费PDF全文

李子章  邵继武  石绍云 《探矿工程》1998,(6):39-40

针对无压浸渍法制造金刚石钻头存在模具费用高、模具加工周期长等缺点,研究了一种新型模具材料（陶瓷粉）取代石墨材料,并研究了一种全新的模具成型方法,简化了模具制造工序,降低了成本。  相似文献   

Mineralogical studies of pyropes in kimberlites from China     

董振信 《中国地球化学学报》1998,17(1):29-43

Based on the measurements of refractive index,specific gravity,unit cell parameter,and mineral chemistry and infrared absorption spectrum analyses of pyropes in kimberlites from China,systematic studies of the Physical properties and compositional variations of pyropes of different colors and diverse paragenetic types,within and between kimberlite provinces have been undertaken,The origin of pyropes in the Kimberlites and the depth of their formation have been discussed.Pyropes of the purple series are different from those of the orange series in physical and chemical properties,for exaple,pyropes of the puple series are higher in α0,RI,SG,Cr2O3,MgO,Cr/(Cr Al),Mg/(Mg Fe),and Mg/(Mg Ca),and lower in Al2O3,Fe2O3 FeO than those of the orange series.The classification of garnets in kimberlites from china by the Dawson and Stephens‘ method(1975) has been undertaken and clearly demonstrates that pyropes of diamond-rich kimberlites contain much more groups than those of diamond-poor,especially diamond-free kimberlites.The higher in α0,RI,SG,Cr2O(3.Cr/(Cr Al),knorringite and Cr-component the pyropes are ,the richer in diamond the kimberlites will be.The infrared absorption spectrum patterns of pyropes change with their chemical composition regularly,as reflected in the shape and position of infrared absorption peaks.Two absortpion bands at 862-901 cm^-1 will grade into degeneration from splitting and the absorption band positions of pyropes shift toward lower frequency with increasing Cr2O3 content and Cr/(Cr Al) ratio of pyropes,LREE contents of orange pyrope megacrysts are similar to those of porple pyrope macrocrysts,but the former is higher in HREE than the latter,showing their different chondrite-normalized patterns.The formation pressures of pyropes calculated by Cr-component,Ca-component,knorringite molecules of pyropes show that some pyropes of the purple series in diamondiferous kimberlites fall into the diamond stability field.but all pyropes of diamond-free kimberlites lie outside the diamond stability field.The megacrysts were formed through early crystallization of kimberlites magma at high pressure condition,the majority of the purple pyrope macrocrysts have been derived from disaggregated xenoliths but the minoirty of them appear to be fragments of the discrete megacryst pyropes,or phenocrysts.  相似文献   

钻石的肉眼鉴别     

常家康 《上海国土资源》1998,(2):9-17,28

根据钻石的光学性质、导热性、亲油疏水性、硬度与工艺钻点,以及钻石的某些表面与内部特征,利用10倍放大镜肉眼可以比较有效地鉴别钻石及其模仿品。  相似文献