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晶化动力学

晶化动力学的相关文献在1985年到2022年内共计137篇,主要集中在金属学与金属工艺、化学、晶体学 等领域,其中期刊论文121篇、会议论文12篇、专利文献790799篇;相关期刊68种,包括太原科技大学学报、同济大学学报(自然科学版)、盐湖研究等; 相关会议11种,包括第十一次全国热处理大会、2014年全国青年摩擦学学术会议、2011全国粉末冶金学术会议暨海峡两岸粉末冶金技术研讨会等;晶化动力学的相关文献由383位作者贡献,包括张湘义、刘建华、张克勤等。

晶化动力学—发文量

期刊论文>

论文:121 占比:0.02%

会议论文>

论文:12 占比:0.00%

专利文献>

论文:790799 占比:99.98%

总计:790932篇

晶化动力学—发文趋势图

晶化动力学

-研究学者

  • 张湘义
  • 刘建华
  • 张克勤
  • 张静武
  • 胡勇
  • 闫志杰
  • 张朋越
  • 严彪
  • 叶佳硕
  • 商雨新
  • 期刊论文
  • 会议论文
  • 专利文献

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    • 杨宁伟; 安良成; 吕俊敏; 刘素丽; 王正; 庹杰; 高新华; 范素兵
    • 摘要: 多孔Na-X分子筛比表面积大,离子交换能力强,常被应用于废水处理、气体吸附分离等领域,通常由硅、铝无机盐原料合成得到。粉煤灰、煤矸石、高岭土、油页岩、稻壳灰、甘蔗渣等矿物及废渣含有高含量的硅、铝元素,经过预处理可用于合成Na-X分子筛。本文综述了多种天然矿物和工业固体废料的组成及合成Na-X分子筛的最新研究进展,讨论了不同矿物和固体废料合成Na-X的活化工艺、晶化动力学及机理,重点分析了合成条件对矿物和固体废料合成Na-X的影响,包括硅铝比、晶化温度、晶化时间、阴阳离子、水硅比、碱灰比、超声条件和有机添加剂的影响。
    • 李东洋; 陶平均; 杨元政; 黄正华; 李福海; 黄文豪
    • 摘要: 采用铜模吸铸法制备出直径3mm的Zr46Cu46Al8块体非晶合金,利用高能球磨法获得了不同粒径的合金粉体,通过X射线衍射仪、示差扫描量热仪、扫描电镜等测试手段及热力学计算方法,研究了制备方法对非晶合金组织结构及晶化动力学的影响。结果表明,块体合金和粉体合金均可获得完全非晶结构;块体非晶合金玻璃转变和晶化过程具有明显的动力学效应;单因素变量法制备非晶粉体的最佳参数为:转速300 r·min^-1,球料比30:1,球磨时间15 h;相同条件下,除过冷液相区外,块体非晶合金热力学参数普遍高于非晶粉体,且晶化放热更剧烈;随着加热速率增大,二者热力学参数均向高温区移动,过冷液相区的宽度也逐渐增加;块体非晶合金和非晶粉体的特征温度表观激活能数值相近,块体非晶态合金的表观激活能较非晶粉体高,热稳定性更优。
    • 谭礼明; 杨凯; 袁建辉; 赵华玉; 陶顺衍; 丁传贤
    • 摘要: 采用大气等离子体喷涂技术制备Fe-Cr-Mo-B-C-P非晶合金涂层,利用XRD和SEM检测喷涂态涂层样品的物相和形貌.通过差示扫描量热分析方法(DSC),在不同升温速率下连续加热测得涂层的特征温度.分别利用Kissinger,Augis-Bennett和Ozawa方程计算相应的活化能(Ec和Ep),并用Matusita-Sakka方程计算Avrami指数n进而分析晶化机制.结果 表明:通过调控等离子体喷涂工艺参数可成功制备出铁基非晶涂层;随着升温速率的增大,Fe-Cr-Mo-B-C-P非晶合金涂层相应的特征温度也逐渐上升,在晶化过程中存在显著的动力学效应.
    • 徐旋旋; 范新会; 李炳; 杨珂; 王攀峰
    • 摘要: 为解释(Cu43Zr48Al9)98Y2块体非晶合金在结晶过程中的成核和生长行为过程,通过铜模吸铸法制备出直径为3 mm的(Cu43Zr48Al9)98Y2块体非晶合金,在非等温和等温模式下研究了该非晶合金的晶化动力学.通过差示扫描量热分析法测得其玻璃化转变温度Tg、晶化起始温度Tx和晶化峰值温度Tp.利用Kissinger方程计算了(Cu43Zr48Al9)98Y2块体非晶合金在非等温条件下的玻璃化转变激活能Eg、晶化激活能Ex和激活能Ep.利用Arrhenius方程计算了该块体非晶合金在等温条件中的平均晶化激活能.结果表明:在非等温条件下,Tg、Tx和Tp均随升温速率的增加向高温方向移动,说明这些特征温度具有明显的动力学效应.Ep大于Ex,说明该非晶合金在晶化过程中晶粒长大比成核过程更为困难.在等温条件下,晶化体积分数的变化速度随着保温温度的降低而变慢,计算得到的平均晶化激活能为222.35 kJ·mol-1,且激活能随晶化体积分数的增加而降低.%(Cu43Zr48Al9)98Y2 bulk amorphous alloys with a diameter of 3 mm were prepared by copper mold suction casting method,and its kinetics was studied in terms of non-isothermal and isothermal modes in order to explain the nucleation and growth behavior of (Cu43 Zr48 Al9)98Y2 bulk amorphous alloys during crystallization process.Glass transition temperature Tg,crystallization onset temperature Tx and crystallization peak temperature Tp were measured by differential scanning calorimetry.The glass transition activation energy Eg,crystallization activation energy Ex and activation energy Ep of (Cu43Zr48Al9)98Y2 bulk amorphous alloy were calculated by using Kissinger equation in non-isothermal condition.The average crystallization activation energy of the bulk amorphous alloy was calculated by using Arrhenius equation in isothermal condition.The results indicate:Tg,Tx and Tp shift to higher temperature with the increase of heating rate in non-isothermal conditions,which shows that these characteristic temperatures have obvious dynamic effects.The value of Ep is slightly larger than Ex,which indicates that the grain growth process is more difficult than the nucleation process for the crystallization process.Under isothermal condition,with the decrease of the holding temperature the change of crystallization volume fraction becomes slow.The average crystallization activation energy is about 222.35 kJ · mo1-1,and the activation energy decreases with the increase of the crystallized volume fraction.
    • 牛犇; 高辉; 张春志; 杨爽
    • 摘要: Al85 Ni10 Er5 amorphous alloys were prepared by melt-spinning method. Preparation and kinetics of crystallization of Al85 Ni10 Er5 alloy were studied by the differential scanning calorimetry ( DSC ) , and the first primary crystallization activation energy (Ex) of Al85 Ni10 Er5 amorphous alloys was obtained as 104 kJ/mol. The topological instability parameter λ of Al85 Ni10 Er5 amorphous alloy was calculated as 0. 087, indicating that Al85 Ni10 Er5 alloy is nanocrystalline alloy. The curves of relation of crystallized fraction with temperature at different heating rates exhibited as a function of "S" shape. A linear relationship was observed,which values of crystallization activation energy Ea( x) decreased with crystallized fraction x increased. In addition,crystallization activation energy E a ( x ) is greater than the primary crystallization activation energy ( E x ) in the crystallized volume fraction from 10% to 50%. The results indicated that further growth of primary crystalline phase was effectively hindered by the disordered atom cluster structure in Al85 Ni10 Er5 amorphous alloy.%应用Kissinger公式计算得到Al85 Ni10 Er5非晶合金初始晶化激活能Ex为104 kJ/mol.计算了Al85 Ni10 Er5非晶合金的拓扑不稳定参数λ=0.087,说明合金是铝基纳米晶合金.Al85 Ni10 Er5非晶合金第一放热峰的晶化体积分数与温度的关系曲线均呈"S"形,随升温速率的增加,这种"S"形曲线均向高温处移动.合金晶化第一阶段的晶化激活能Ea(x)与晶化体积分数呈线性递减趋势.此外,晶化体积分数在10%~50%阶段的激活能Ea(x)大于合金初始晶化激活能Ex,这是由于非晶合金内稳定的无序原子团簇结构有效地抑制了初生晶相长大的结果.
    • 马运柱; 罗涛; 刘文胜; 王娟
    • 摘要: 以异丙醇铝和九水硝酸铝为铝源,去离子水为溶剂,聚合物A为纺丝助剂,采用溶胶-凝胶法制备氧化铝长纤维,利用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)和傅里叶红外光谱仪(FR-IR)等,对纤维的形貌和组织结构进行观察与分析,并结合kissinger-akahira-sunose(KAS)法、flynn-wall-ozawa(FWO)法和Starink法研究纤维的结晶动力学.结果表明:凝胶纤维的直径约为4~7μm,纤维形貌良好,无明显开裂;当纤维以10°C/min的速率从室温加热至1200°C时,纤维在800~900°C间由非晶相转变为γ-Al2O3,在1100°C以上温度下γ-Al2O3转变为α-Al2O3;通过KAS法计算得到氧化铝纤维由非晶相转变成γ-Al2O3的激活能为412.1 kJ/mol,由γ-Al2O3向α-Al2O3转变的激活能为422.3 kJ/mol,与Starink法和FWO法的计算结果吻合良好,验证了KAS法计算结果的精确有效性.
    • 高谦; 坚增运; 翟逸玥; 王凯; 贾婷婷
    • 摘要: 为了解决金属玻璃的稳定性问题,分析了Cu基金属玻璃的晶化动力学特征.采用单辊急冷法制备了Cu48 Zr45 Al7非晶带材,用X射线衍射仪和差示扫描量热仪对试样的非晶结构和特征温度进行了测试.根据V F方程确定了试样的动力学理想玻璃转变温度T0,通过Kissinger、Moynihan和Kissinger-Akahira-Sunose方程分别计算了玻璃转变激活能Eg、开始析晶激活能Ex和局部激活能Eα,并研究其稳定性问题.研究结果表明:玻璃转变温度Tg和开始析晶温度Tx随升温速率的变化具有明显的动力学特征,且T0等于649.4 K.基于不同理论模型的Kissinger和Moynihan方程计算出的激活能在误差范围内(±12 kJ·mol-1),其结果相一致.当晶化体积分数α0.5时,Eα从329.3 kJ·mol-1单调减小为282.6 kJ·mol-1,晶化过程需要克服的能垒逐渐减小,晶化过程越易进行.%To solve the problem of the stability of metallic glass,crystallization kinetics of Cu-based metallic amorphous alloy was investigated.The Cu48 Zr45 Al7 metallic glass ribbons were successfully prepared by means of melt-spinning method.The sample structure and characteristic temperatures were tested using X-ray diffraction (XRD)and differential scanning calorimetry (DSC).Kinetic ideal glass transition temperature T0 was determined by Vogel-Fulcher (VF ) equation and glass transition activation energy Eg and onset crystallization activation energy Ex were obtained by Kissinger and Moynihan equations Besides,Kissinger-Akahira-Sunose (KAS ) equation was used to obtain local activation energy Eα.The problem of stability was studied by these activation energies.It is found:The variation of glass transition temperature Tg and onset crystallization temperature Tx with heating rate is a manifestation of the kinetic effect and T0 is equal to 649.4 K.The calculated activation energies using Kissinger equation agree with that of Moynihan equation within errors (±12 kJ·mol-1 ),although these equations are based on different theoretical methods.Local activation energy Eαremains approximately a constant value (324±5)kJ·mol-1 ,which suggests that crystallization overcomes a constant barrier at crystallized volume fractionα0.5.
    • 陈振华; 赵秀媛; 王辉平; 张昊; 陈鼎
    • 摘要: Non-isothermal crystallization transformation kinetics and isothermal crystallization kinetics of prepared Zr57 .5 Cu27 .3 Al8.5 Ni6 .7 bulk metallic glass (BMG)were investigated with differential scanning calorimetry (DSC).In isochronal mode,the values of activation energy,E g ,E x ,E p 1 and E p2 ,calculated by Kisinger method are 409.70 kJ/mol (± 60.07 kJ/mol),335.53 kJ/mol (± 39.94 kJ/mol),323.95 kJ/mol (± 15.21 kJ/mol)and 187.75 kJ/mol (± 13.27 kJ/mol),respectively.In isothermal mode,the S-shape relation curves of crystalline volume fraction and temperature reveal the typical transition of nuclea-tion and growth.The Avrami exponent n ranges from 3.0 to 4,indicating the crystallization mechanism in the Zr57 .5 Cu27 .3 Al8.5 Ni6 .7 BMG is mainly interface-controlled.The crystal growth way changes from two-di-mensional growth with decreased nucleation rate to three-dimensional growth in the isothermal crystalliza-tion process.In isothermal mode,the mean value of activation energy is 434.81 kJ/mol,which is higher than that in the isochronal mode.%对制备的Zr57.5Cu27.3Al8.5Ni6.7非晶合金的等温与非等温晶化动力学通过差式扫描量热法(DSC)进行了研究,根据Kisinger方程计算出Zr57.5Cu27.3Al8.5Ni6.7非晶合金在非等温条件下的激活能Eg,Ex,Ep1和Ep2,分别为409.70kJ/mol(±60.07kJ/mol),335.53kJ/mol(±39.94kJ/mol),323.95kJ/mol(±15.21kJ/mol)和187.75kJ/mol(±13.27kJ/mol).在718K,723K,728K和733K等温条件下得到的晶化体积分数与时间的关系曲线呈“S”型,表明晶化过程为典型的形核长大型转变.Avrami指数n的范围为3≤n≤4,表明晶化过程由界面控制的二维长大转变为界面控制的三维长大,形核率随时间逐渐降低至稳定,等温晶化过程得到的激活能平均值434.81kJ/mol,高于非等温晶化过程的有效激活能.
    • 李凝; 黄健萌; 马继杰; 曾平; 王华东
    • 摘要: 在化学镀 Ni-P 溶液中添加纳米聚四氟乙烯(PTFE)颗粒,沉积获得磷含量为9%(质量分数)的高磷 Ni- P/PTFE合金镀层,以考察该合金的晶化动力学特性及其耐腐蚀性能。综合单晶X射线衍射及差热分析(DSC)的结果表明,获得的镀层结构为非晶态与纳米晶的混合结构,较非晶态合金的晶化活化能低。纳米PTFE颗粒的存在可能提高了该结构合金的晶化温度。热处理后的Ni-P/PTFE合金的耐腐蚀性能增强与其所形成的钝化膜有关。%The Ni-P/PTFE alloy coating with 9%(mass fraction) of high phosphorus was prepared by adding polytetrafluoroethene (PTFE) particles into the electroless Ni-P solution, and the crystallization kinetics characteristics of the alloys and its corrosion resistance were researched. The X-ray diffraction and the differential thermal analysis (DSC) results show that the composite coating is a compound of amorphous and nanocrystalline. The crystallization activation energy decreases because of the nanocrystalline as the crystal core of the amorphous in heating process. The existence of the nano-PTFE particles can increase the crystallization temperature of the alloy. The improve of Ni-P/PTFE alloy corrosion resistance is related to the formation of passivation film after heat treatment.
    • 邓福涛; 刘新才; 潘晶; 李明; 姜小丽; 鲁贻虎
    • 摘要: The heating curves of Nd9 Fe85 .5-x Cox B5 .5 (x=3%,5at%)amorphous alloy ribbons were measured by DSC protected by filling argon after vacuuming.The crystallization activation energy E,frequency factor Z,re-action rate constant K and Avrami exponent n of the two kinds of amorphous alloy ribbons were calculated ac-cording to the DSC curves.It was confirmed that the crystallization process changes from one step to two-steps with Co content increasing from 3% to 5at%.And the higher Co content in the alloy,the higher crystallization activation energy E and crystallization reaction rate constant K of both the initial crystallization temperature Tx and the peak one Tp.This was the reason that the increase of frequency factor Z playes a key role.At the heat-ing speed 10K/min,the local Avrami exponent n of Nd9 Fe82 .5 Co3 B5 .5 decreases sharply at first and then slow down with the increase of crystallization volume fraction x ,but it rises again when x was more than 90%.It demonstrates that when x was less than 12%,the crystallization nucleation mainly in the three-dimensional nu-cleation mode,and it changes into the two-dimensional nucleation one when x was 12%-36%,after 36% it does in the one-dimensional nucleation one.%采用真空再充 Ar 保护的 DSC 测量了Nd9 Fe85.5-x Cox B5.5(x=3%,5%(原子分数))非晶薄带的升温曲线,计算了两种非晶薄带的晶化激活能E、频率因子Z、反应速率常数K、Avrami 指数n .实验证实了Co从3%(原子分数)增大到5%(原子分数)时晶化过程从一步改变为两步晶化;计算结果表明晶化起始温度T x 及晶化峰值温度T p 的晶化激活能、晶化反应速率常数均随Co的增加而增大,其主要原因是增大的频率因子起了关键作用;分析计算结果认为Nd9 Fe82.5 Co3 B5.5在升温速度10 K/min时局域Avrami指数n 随着晶化体积分数x 的增加先急剧降低而后缓慢降低、90%之后又有所升高,表明晶化形核在 x<12%以三维形核方式为主,在x 为12%~36%时晶化以二维形核方式为主,之后直到晶化结束以一维形核方式为主.
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