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1.
热压碳化钨基复合胎体材料性能试验 总被引：3，自引：0，他引：3
为了提高碳化钨（WC）基复合胎体材料的性能,在烧结压力为13 MPa、升温时间为6 min、保温时间为5 min的情况下,采用真空热压烧结的方法制备了金刚石钻头所用的10种不同比例WC基胎体材料试样30块,并对试样进行了洛氏硬度(HRC)、抗弯强度(σ)等性能测试。通过试验数据分析研究了WC、663青铜(ZQSn663)、锰(Mn)、钴(Co)、镍(Ni)与胎体材料HRC和σ的关系。结果表明：WC质量分数对胎体的HRC和σ的影响是主要因素,胎体的HRC和σ具有内在联系,HRC高的胎体σ往往也高;在胎体配方中各个成分的含量都应得到控制才能保证胎体的性能优良,各成分的质量分数控制为：w(WC)<59.1%, w(ZQSn663)>25%, 3%<w(Ni)<6.5%, 0.9%<w(Co)<3.5%, w(WC-ZQSn663)<20%。 相似文献
2.
针对孕镶金刚石钻头在强研磨性地层中磨损快、寿命短的问题,利用WC硬度高、润湿性好、耐磨性好的特点,向铁基预合金粉末中添加WC颗粒作为胎体骨架金属。通过测试不同WC含量的胎体试样的硬度、抗冲击韧性以及抗弯强度,寻找骨架金属WC对胎体性能的影响规律。试验结果发现,随着WC含量的逐渐增加,胎体的硬度、抗冲击韧性、抗弯强度均呈现先增大后减小的变化趋势。从微观和能量的角度出发,分析了出现这种规律的原因。最后得出烧结温度为830 ℃、WC含量为5%时,胎体的性能达到最优,此时胎体的强度和研磨性最大。 相似文献
3.
为了提高钻进坚硬岩层的工作效率,将孕镶金刚石钻头胎体结构设计为栅格状,分析了栅格状孕镶金刚石钻头钻进岩层时的碎岩方式,并采用粉末冶金法制备Inconel 718和CoCrMo试样,通过分析不同烧结温度对两种胎体试样的硬度、耐磨性及抗弯强度的影响,确定了两种材料的最优烧结参数,并对其在该烧结温度下的力学性能进行对比分析。研究结果表明:Inconel 718和CoCrMo均具有较好的抗弯强度,满足钻进坚硬岩层对胎体抗弯强度的要求。Inconel 718的硬度比传统WC基胎体材料小,试样磨损量较大,适合用于地质灾害应急勘查等要求钻进速度快的极端情况;CoCrMo的硬度及耐磨性与传统WC基胎体接近,适合作为孕镶金刚石钻头的胎体材料。 相似文献
4.
为减小孕镶金刚石切削工具的烧结温度对单晶金刚石性能的影响和改善切削工具胎体性能,降低烧结温度和优选胎体配方材料是很好的解决方法。在切削工具的胎体中加入适量纳米镍粉,通过对制备试样的硬度、强度和耐磨性测试及微观特征分析,综合评价该方法的可行性。结果表明：对于WC基胎体,含有纳米镍粉的胎体较不含纳米镍粉的胎体HRC提高11.9%,抗弯强度提高18.4%,耐磨性提高44.5%;对于Fe基胎体,含有纳米镍粉的胎体较不含纳米镍粉的胎体HRC提高19.5%,抗弯强度提高0.2%,耐磨性提高33.3%。既减小了温度对金刚石的影响,又提高了切削工具整体性能。 相似文献
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为提高金刚石钻头钻进钢筋混凝土、强磨性岩层的钻进效率,选择了一种耐磨性高、冷压成型好的铁预合金粉。本文设计了铁基胎体配方,研究了铁基预合金粉、Cu、Ni、Co各成分对铁基金刚石钻头胎体及钻进性能的影响。测试了不同配方下烧结试样的抗拉强度、三点抗弯强度和硬度,使用扫描电镜对断口进行微观分析,通过现场钻进实验测试钻头的钻进效率与寿命。同时分析了保温时间对铁基胎体力学性能的影响。结果表明：Cu、Ni、Co对铁基胎体的抗弯强度和硬度影响较大,且保温时间为5 min时,铁基胎体可以获得较好的力学性能。 相似文献
7.
文章介绍了超细FeCoCu预合金粉末应用于金刚石钻头胎体中的试验研究。通过基础性试验测试表明：在663Cu含量为30%的前提下,在金刚石钻头胎体组成成分中添加FeCoCu预合金粉末,通过调节其与WC粉末的配比关系,能够有效地调节钻头胎体硬度,适应不同的地层。通过回归分析得到了胎体硬度与FeCoCu粉末加量的数学关系式,由此关系式可预测胎体硬度或计算FeCoCu粉末加量。经过野外实际钻进试验证明：添加了FeCoCu粉末的金刚石钻头胎体综合性能具有较大的提高,为后续钻头耐磨性研究提供了经验积累。 相似文献
8.
金刚石钻头是勘探工作中的常见破岩工具,但金刚石热稳定性较差,在钻进过程中会不断产生热量,干旱缺水条件下钻头自冷却对钻进效率的提高具有非常重要的意义。为降低干钻条件下钻头胎体与岩石界面间的摩擦因数从而减少钻进过程中金刚石的热损伤,在热压Fe基金刚石钻头胎体中添加二硫化钼(MoS2),研究MoS2含量对Fe基钻头胎体相对密度、洛氏硬度、抗弯强度以及与白刚玉砂轮干磨时的磨损量和摩擦因数的影响,并用扫描电子显微镜(SEM)和能谱仪(EDS)等测试仪器分析了抗弯强度和摩擦磨损试验后的试样断口和表面的形貌及物相成分。试验结果表明,在试验范围内,Fe基胎体相对密度与MoS2含量关系不大,但是与未添加MoS2的Fe基胎体相比,其相对密度提高了约2.5%,达98%以上。Fe基胎体洛氏硬度随着MoS2含量的增加先增大后减小,在MoS2体积分数为8%时胎体硬度最大,洛氏硬度HRB值达101.3。Fe基胎体抗弯强度随着MoS2含量的增加先增大后减小,在MoS... 相似文献
9.
钴基胎体金刚石钻头具有性能好、价格高的特点,以Fe代Co作为胎体材料是提高金刚石钻头性价比的主要方法之一。但是Fe替代Co后存在金刚石热损伤严重、被包镶强度不足、胎体抗冲击和耐磨性差等问题,因此改善热压铁基金刚石钻头胎体力学性能对降低钻探成本、提高钻探效率具有重要研究意义。利用自行设计的磁处理设备对铁基热压金刚石钻头胎体进行磁化处理,通过正交试验等方法研究了磁感应强度、磁场频率和磁处理时间对胎体硬度、抗弯强度和耐磨性的影响及其规律。试验结果表明:试验胎体硬度最优磁处理参数为0.8 T/8 Hz/3 min,磁处理后胎体抗弯强度最高提升了13.8%,耐磨性增加,特别是含金刚石的胎体磁处理后其磨损量可降低38.1%。 相似文献
10.
为了研究具有自润滑性能的孕镶金刚石钻头胎体材料,进行了在胎体配方中添加石墨的研究。对胎体材料的抗弯强度、硬度、耐磨性和材料与白刚玉砂轮组成摩擦副时的摩擦系数进行了测定,并用扫描电子显微镜观察了磨损表面形貌。实验结果表明,添加石墨后,胎体材料的硬度和抗弯强度下降,与60目白刚玉砂轮组成摩擦副时的摩擦系数下降,耐磨性则随着石墨含量的增多先增强,后下降（超过6％后）。形貌分析表明,不含石墨的胎体材料在磨损中发生明显的塑性变形;添加石墨后,胎体材料的塑性降低,出现犁沟和剥落现象。 相似文献
11.
Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
12.
Inter-regional correlation of transgressions and regressions in the Cretaceous period 总被引：1，自引：0，他引：1
T. Matsumoto 《Cretaceous Research》1980,1(4):359-373
Well investigated platforms have been selected in each continent, and the history of Cretaceous transgressions and regressions there is concisely reviewed from the available evidence. The factual records have been summarized into a diagram and the timing of the events correlated between distant as well as adjoining areas.On a global scale, major transgressions were stepwise enlarged in space and time from the Neocomian, via Aptian-Albian, to the Late Cretaceous, and the post-Cretaceous regression was very remarkable. Minor cycles of transgression-regression were not always synchronous between different areas. Some of them were, however, nearly synchronous between the areas facing the same ocean.Tectono-eustasy may have been the main cause of the phenomena of transgression-regression, but certain kinds of other tectonic movements which affected even the so-called stable platforms were also responsible for the phenomena. The combined effects of various causes may have been unusual in the Cretaceous, since it was a period of global tectonic activity. The slowing down of this activity followed by readjustments may have been the cause of the global regression at the end of the Cretaceous. 相似文献
13.
The Afyon stratovolcano exhibits lamprophyric rocks, emplaced as hydrovolcanic products, aphanitic lava flows and dyke intrusions, during the final stages of volcanic activity. Most of the Afyon volcanics belong to the silica-saturated alkaline suite, as potassic trachyandesites and trachytes, while the products of the latest activity are lamproitic lamprophyres (jumillite, orendite, verite, fitztroyite) and alkaline lamprophyres (campto-sannaite, sannaite, hyalo-monchiquite, analcime–monchiquite). Afyon lamprophyres exhibit LILE and Zr enrichments, related to mantle metasomatism. 相似文献
14.
正20140751 Guo Xincheng(Geological Party,BGMRED of Xinjiang,Changji 831100,China);Zheng Yuzhuang Determination and Geological Significance of the Mesoarchean Craton in Western Kunlun Mountains,Xinjiang,China(Geological Review,ISSN0371-5736,CN11-1952/P,59(3),2013,p.401-412,8 相似文献
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正20141058 Chen Ling(Key Laboratory of Mathematical Geology of Sichuan Province,Chengdu University of Technology,Chengdu610059,China);Guo Ke Study of Geochemical Ore-Forming Anomaly Identification Based on the Theory of Blind Source Separation(Geosci- 相似文献
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正20141334 Chen Kun(Institute of Geophysics,China Earthquake Administration,Beijing100081,China);Yu Yanxiang Shakemap of Peak Ground Acceleration with Bias Correction for the Lushan,Sichuan Earthquake on April20,2013(Seismology and Geology,ISSN0253-4967,CN11-2192/P,35(3),2013,p.627-633,2 illus.,1 table,9 refs.)Key words:great earthquakes,Sichuan Province 相似文献
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正20141624 Cai Xiongfei(Key Laboratory of Geobiology and Environmental Geology,Ministry of Education,China University of Geosciences,Wuhan 430074,China);Yang Jie A Restudy of the Upper Sinian Zhengmuguan and Tuerkeng Formations in the Helan Mountains(Journal of Stratigraphy,ISSN0253-4959CN32-1187/P,37(3),2013,p.377-386,5 illus.,2 tables,10 refs.) 相似文献
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正20142263Lü Shaojun(Geological Survey of Jiangxi Province,Nanchang 330030,China)Early-Middle Permian Biostratigraphical Characteristics in Qiangduo Area,Tibet(Resources SurveyEnvironment,ISSN1671-4814,CN32-1640/N,34(4),2013,p.221-227,2illus.,2tables,22refs.)Key words:biostratigraphy,Lower Permian,Middle Permian,Tibet 相似文献
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正20142560Hu Hongxia(Regional Geological and Mineral Resources Survey of Jilin Province,Changchun 130022,China);Dai Lixia Application of GIS Map Projection Transformation in Geological Work(Jilin Geology,ISSN1001-2427,CN22-1099/P,32(4),2013,p.160-163,4illus.,2refs.) 相似文献
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正20140692 Duo Tianhui(No.402 Geological Team,Exploration of Geology and Mineral Resources of Sichuan Authority,Chengdu611730,China);Wang Yongli Computer Simulation of Neptunium Existing Forms in the Groundwater(Computing Techniques for Geophysical and Geochemical Exploration,ISSN1001-1749,CN51-1242/P,35(3), 相似文献