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中国浙江人FCGR3B基因型及FCGR3基因变异的分析
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, June 2007, Pages
XPS study of the initial stages of oxidation of α2-Ti3Al and γ-TiAl intermetallic alloys, , , , , , , a Laboratoire de Physico-Chimie des Surfaces, CNRS (UMR 7045) & Universit& Pierre et Marie Curie, Ecole Nationale Sup&rieure de Chimie de Paris, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, Franceb ONERA, D&partement Mat&riaux M&talliques et Proc&d&s, BP 72-29 Avenue de la Division Leclerc 92322 Ch&tillon Cedex, FranceThe initial stages of oxidation of α2-Ti3Al and γ-TiAl alloys at 650&#xA0;&C under low oxygen pressure are shown to be characterized by three stages using XPS. Stage I is a pre-oxidation stage characterized by the adsorption and absorption of oxygen species. When the subsurface is saturated with dissolved oxygen (16 and 2&#xA0;at.% on α2-Ti3Al and γ-TiAl, respectively), the selective oxidation of the alloy leads to the nucleation and growth of ultrathin (&0.5 and &1.2&#xA0;nm on α2-Ti3Al and γ-TiAl, respectively) alumina layers (stage II). The growth kinetics of the alumina layers is limited by the transport of Al in the alloy, leading to Al-depletion in the metallic phase underneath the oxide. When a critical concentration is reached (Ti82Al18 and Ti75Al25 on α2-Ti3Al and γ-TiAl, respectively), titanium oxidation occurs (stage III). Ti(III) and Ti(IV) oxide particles are formed at the surface of the still growing alumina layer.KeywordsTitanium aluminides; Oxidation; Diffusion; Surface; XPS
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No articles found.ZCuSn10Pb1_百度百科
ZCuSn10Pb1
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ZCuSn10Pb1铸造铜合金，合金牌号。其硬度高，耐磨性极好，不易产生咬死现象，有较好的铸造性能和切削加工性能，在大气和淡水中有良好的耐蚀性。ZCuSn10Pb1铸造铜合金可用于高负荷（20MPa以下）和高滑动速度（8m/s）下工作的耐磨零件，如连杆、衬套、轴瓦、齿轮、蜗轮等。
●特性及适用范围：
●化学成份：
铜 Cu ：其余
锡 Sn ：9.0～11.5
锌 Zn：≤0.05(杂质)
铅 Pb：≤0.25(杂质)
磷 P：0.5～1.0
镍 Ni：≤0.10(杂质)
铝 Al：≤0.01(杂质)
铁 Fe：≤0.1(杂质)
ZCuSn10Pb1铸造锡青铜
锰 Mn：≤0.05(杂质)
硅 Si ：≤0.02(杂质)
锑 Sb ：≤0.05(杂质)
硫 S ：≤0.05(杂质)
注：杂质总和≤0.75
●力学性能：
抗拉强度 σb (MPa)：≥360
屈服强度 σ (MPa)：≥170(参考值)
伸长率 δ5 (%)：≥6
硬度 ：≥885HB(参考值)
●热处理规范：加热温度℃；浇注温度980～1050℃。
●铸造方法：连续铸造Phys. Rev. A 64, 01) - Saturated x-ray lasers at 196 and 73 \AA{} pumped by a picosecond traveling-wave excitation
Traveling-wave irradiation with a laser pulse of duration ~1 picosecond has been shown to achieve saturated operation of Ne- and Ni-like x-ray lasers. Gain at 196 ? was confirmed by observation of both forward and backward x-ray laser beams from a germanium plasma under ideal and nonideal traveling-wave conditions at a small signal gain of &40 cm-1. Saturation was observed for targets &4 mm long consistent with a model of laser amplification along the plasma medium and with the output of a detailed ray-tracing post-processor coupled to a hydrodynamic and atomic physics code. Ni-like samarium targets, pumped under ideal traveling-wave conditions exhibited a small signal gain of ~19 cm-1 at 73 ? with saturation observed for targets 8 mm long.DOI:http://dx.doi.org/10.1103/PhysRevA.64.053810Authors & Affiliations
1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 1, 3, and 31Department of Physics, The University of York, Heslington, York YO10 5DD, United Kingdom2School of Mathematics and Physics, Queen’s University of Belfast, Belfast BT7 1NN, United Kingdom3The Rutherford Appleton Laboratory, Chilton, Didcot, OXON OX11 0QX, United KingdomReferences (Subscription Required)
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