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碳的活度
activity of carbon
The results showed that the gradient of activity of carbon are is the driving force of carbon migration. The mathematical relation between contents of carbon and chromium in rich carbon section can be expressed as w(C)=0.8+0.3536w(Cr). 指出驱动碳迁移的动力是碳的活度梯度,并推导出富碳区碳质量分数随铬质量分数变化的数学关系式:w(C)=0.8+0.3536w(Cr)。 短句来源 carbon activity
The decarburization character was investigated under different heating conditions for spring steel 60Si2Mn and 5160H by means of microstructure comparison technique. The result shows that the decarburization depth increases with the increase in temperature and holding time for the two steels. The surface decarburization for steel 60Si2Mn is more serious than for 5160H, because the carbon activity is increased by silicon. 用显微组织法比较了60Si2Mn和5160H弹簧钢在不同加热条件下的脱碳行为．结果表明,两种弹簧钢的脱碳深度随提高加热温度和增加加热时间增大．Si增加奥氏体中碳的活度使60Si2Mn钢表面脱碳较5160H严重． 短句来源 “碳的活度”译为未确定词的双语例句
The activity coefficient of carbon in Fe-C-Si ternary melt and its related activity interaction coefficients were calculated by the Gibbs-Duhem equation integration. 用Gibbs-Duhem方程积分计算了Fe-C-Si三元熔体的碳的活度系数lnγ_C。 短句来源 According to the kinetic equations of the chemical reactions on the solid surface, it is deduced that the carbon transfer quantity from gas phase to solid phase is in direct proportion to the difference of carbon activiries between gas phase and solid phase. 根据固相表面的化学反应动力学方程,推导出碳由气相到固相的传递量正比于气—固相间碳的活度差。 短句来源 The formation condition and morphology characteristics of alloy carbides were studied. The Gibbs free energy of carbide precipitation in Mn－ containing steels were calculated by alloy thermodynamical theory. The effects of adding Mn into high－ carbon Cr steels on microstructures and mechanical properties formed duringγ→α transformation were explored. 对两种高碳 Cr－ Mn钢进行了等温转变处理、显微组织观察及力学性能测试，研究了合金碳化物的形成条件和形态特征，用合金热力学理论计算了奥氏体中碳的活度和碳化物析出的自由能，探讨了 Mn的添加对高碳 Cr钢γ→α直接转变组织及性能的影响。 短句来源 The effective approach to prevent the graphite blooming is to reduce the carbon inheritance of the ingredients,to avoid producing big graphite in the spherical process,to lower heat mix flow of the high temperature iron water,to lower the activities of carbon and increase the austenite strength to control the quantities of pouring(iron) water during the spherical process accurately,and to control the temperatures when out of furnace and pouring accurately. 减少原料中碳的遗传、避免球化处理时出现大的石墨球、降低高温铁水的热混流、降低碳的活度和增强奥氏体的强度、准确把握球化处理和倒包时铁水量、准确控制出炉温度和浇注温度是防止石墨开花的有效途径。 短句来源 相似匹配句对
Carbon cycling 碳的循环 短句来源 CARBON IN CHEMICAL GEODYNAMICS 碳的化学地球动力学 短句来源 Measurement Of Activity Of Radioactive Gas (In Chinese) 放射性气体活度测量 短句来源 An intelligential nuclide activity meter 智能化核素活度计 短句来源 The activity coefficient of carbon in Fe-C-Si ternary melt and its related activity interaction coefficients were calculated by the Gibbs-Duhem equation integration. 用Gibbs-Duhem方程积分计算了Fe-C-Si三元熔体的碳的活度系数lnγ_C。 短句来源 
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Activity of Carbon Metabolism Enzymes in Wheat Plants Treated with Kartolin-4 and Exposed to Water Stress
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Under conditions of water stress, a partial decrease in the activity of carbon metabolism enzymes in vitrowas accompanied by complete inhibition of photosynthesis in vivo, perhaps, as a result of an abrupt increase in the stomatal resistance.
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Physico-chemical characteristics and sorption activity of carbon, organosilica sorbents and their modified forms towards proteins, possessing specific activity, and cholerae vibrio have been studied.
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The effect of lead on the activity of carbon-fixation enzymes inPotamogeton pectinatus
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On the activity of carbon dioxide fixation in growing yeasts
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Attempt was made to use the calculated stability diagram of carbon activity to explain the experimental observations.
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The wettability of the metal/oxide interface in the anode cermet (Ni/ZrO2-Y2O3) has been found to be influenced by chemical reactions resulting from the applied reducing atmosphere with high carbon activity.
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The wettability of the metal/oxide interface in the anode cermet (Ni/ZrO2-Y2O3) has been found to be influenced by chemical reactions resulting from the applied reducing atmosphere with high carbon activity.
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This behavior can be understood by considering the aspects that no large-area epitaxy between the graphite basal plane and the Ni(110) terraces exists and that the surface carbon activity was too low to initiate substrate restructuring.
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The gradient of the carbon activity in Wagner's and in Zupp-Stevenson's interpretation is presumed to be the intrinsic driving force.
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The purpose of this series is to make a thermodynamic analysis of the Fe-C system with a minimum of assumptions and to revise the equilibrium diagram of the same system in the light of the results of this investigation. In this paper, the first of the series, activities in liquid Fe-C alloys have been evaluated up to saturation, using Richardson and Dennis' data123 on dilute solutions of carbon in liquid iron and Darken and Smith's model~([1]) for carbon dissolved in austenite with certain modifications.A p... 作者在本文中综合分析了关於液态铁碳合金中碳活度测定的諸家研究结果並比较其优劣. 然后根据Richardson与Dennis用CO_2/CO平衡法的实验数据,用Darken与Smith的统计模型与最少假定,导出了液态鉄碳合金中α′_c与N′_c的关系(α′_c=logγ′_c,/(N_Fe′)~2,标准状态为石墨),并温度对此关系的影响.计算结果符合於(i)鉄液内石墨溶解度的实验数据;(ii)与用电动势法测定液态铁碳合金中碳活度的实验数据;及(iii)奥氏体、铁液、石墨共晶平衡的要求. 根据本文所导出的α′_c-N′_c曲綫,作者算得石墨在鉄液内的溶解热为3930卡;然后依此及其他必需数据,导出下列关系:C(石墨)=C[%],△F°=3930-9.21T. 最后作者从液态铁碳合金结构的观点讨论了图1中α′_c-N′_c曲綫的形状. 文摘来源 In the ultraviolet region, the absorption spectrum of carbon tetrachloride in water is different from that of pure carbon tetrachloride. In the range A = 2000A to 2500A, the absorption spectrum of carbon tetrachloride in water possesses a maximum at 2085 A, at which the optical densities are proportional to the concentrations of carbon tetrachloride in water, that is to say, Beer's law is obeyed.Our limited experience shows that in some salt solutions [(CH_3)_4NC1, (CH_3)_4NBr,NaClO_3, NaBr, CsCl and HCl], ... 在紫外光区四氯化碳的吸收光谱和它在水中的吸收光谱并不相同.在波长2000-2500??的范围内,四氯化碳在纯水中的吸收光谱有一高峰出现于λ=2085??的位置.在这峰上,体系的光密度和四氯化碳在水中的浓度成正比,顺从Beer定律. 我们的有限经验发现在某些盐水溶液中[(CH_3)_4NCl,(CH_3)_4NBr,NaClO_3,NaBr,CsCl和HCl],四氯化碳的吸收峰发生移动.但是浓度不太大的锂、钠、钾、钙的氯化物和钠、钾、镁的硫酸盐的水溶液中,四氯化碳的吸收峰仍在λ=2085??,并且不随盐的浓度的变化而移动.在这波长上,Beer定律仍能适用. 我们用分光光度计在25℃下(除氯化锂溶液是在20°外)测定不同浓度的上述七种盐溶液中四氯化碳的活度系数f,得到七条直线形的logf对C_5(克分子/升)的图.这些盐对四氯化碳都起盐析作用,盐析次序是如果浓度单位是离子强度μ,从logf对μ的图得到的盐析次序是: Na_2SO_4>K_2SO_4>NaCl>KCl>CaCl_2>MgSO_4>LiCl此盐析次序不合离子大小的次序(离子愈小,盐析愈大);偏差特别显著的是含很小离子的盐,氯化锂和硫酸镁.... 文摘来源 An investigation of the first kind migration process of carbon has been carriedout on the welded joints of a 12AlMoV steel by means of microscopy, EPMA anddilatometry. It is shown that this carbon migration is caused by the existance ofa significant activity gradient of carbon between the two sides of fusion line. Thismay take place as a result of the earlier precipitation of pro-eutectoid ferrite onone side of the fusion line within a temperature range that rapid diffusion ofcarbon atoms occurs. This confi... 用金相、电子探针、膨胀分析等对12AlMoV钢焊接接头第一类碳迁移过程进行了研究.结果证明,发生这类碳迁移是由于在碳快速扩散的温度范围,熔合线一侧较早地析出先共析铁素体,使熔合线两侧存在显著的碳活度差所产生.从而验证了作者等提出的焊接接头碳迁移的活度原理. 对这类接头,晶体结构的不同所引起碳活度系数的差别,较之合金成分的不同引起的差别为大.前者是发生第一类碳迁移的主要的热力学条件.从动力学方面考虑,碳迁移进行的程度,与一定温度下的保持时间有关. 为减弱和抑制12AlMoV钢焊接接头碳迁移,并提出了合金化和焊接工艺措施. 文摘来源 << 更多相关文摘 
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