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   等温烧结 的翻译结果: 查询用时:0.588秒
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等温烧结
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  isothermal sintering
     The isothermal sintering kinetics of nanocrystalline Dy1-xSrxCoO3-y(x=0.6) were studied, and the sintering activation energy was calculated.
     研究了纳晶氧化物Dy_(1-x)Sr_xCoO_(3-x)(x=0.6)的等温烧结动力学,计算了烧结激活能,结果表明:在烧结初期,致密化机制主要为蒸发-凝聚传质;
短句来源
     It was found that it is only when sintering temperature increases to a certain value that ZnO particles can agglomerate and the densification process can begin. Densification is the base for ZnO varistor ceramics to obtain stable electrical properties. B2O3 with low melting point can decrease the initial temperature of densification, and the isothermal sintering during densification has hardly influences on the maximum density of ZnO varistor ceramics.
     本文研究了氧化锌压敏陶瓷的致密化过程,结果发现只有当烧结温度升高到一定值时,试样中的ZnO粉粒产生聚集,致密化过程才开始.致密化是瓷体获得稳定电性能的基础.低熔点添加剂B2O3可以降低致密化的起始温度,而致密化过程中的等温烧结对ZnO压敏陶瓷的最大密度几乎没有影响.
短句来源
  “等温烧结”译为未确定词的双语例句
     As the results showed, when SiC/1# was made under the condition of sintering at 1120 ℃ for 30 minutes, it had excellent mechanical properties and wear resistance.
     研究表明:对SiC/1~#而言,1120℃等温烧结30min可以获得最佳的机械性能与耐磨性的综合配比。
短句来源
     When the ratio of corundum and the bond was 6.5:3.5, the bending strength at sintering temperature of 850℃ for 7 minutes was 125.7MPa.
     在烧成温度为850 ℃,等温烧结时间为7 min,砂结比为6.5:3.5的条件下,结合剂的抗折强度为125.7 MPa,是一种低熔高强结合剂。
短句来源
     2Y-TZP with 0. 3mol% additives Ca,Mn,Mg nanophase powders were prepared by chemical copreci-pitation-gel method respectively. Specimens were Sintered in air.
     用化学共沉淀—凝胶法制备了分别添加0.3mol%Ca、Mn、Mg的2Y—TZP纳米粉末,在常压下进行了等温烧结试验。
短句来源
     The results indicate that the sintering process is possibly controlled by the diffusion of Al3+ and O2- in the liquid phase.
     通过等温烧结动力学,确定掺杂 Al2O3陶瓷烧结激活能为25.2kJ/mol,表明可能是氧离子和铝离子在液相中的扩散作用控制了烧结过程。
短句来源
     Then for a choosen material onecan check isobar sintering curves(density versus time at constant pressure and dif-ferent temperatures) or isotherm sintering curves (density versus time at constanttemperature and different pressures).
     而且人们能够对某种选定的材料的热压烧结曲线(当压力恒定,温度不同时,密度随时间的变化关系)和等温烧结曲线(当温度恒定,压力不同时,密度随时间的变化关系)进行试验。
短句来源
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  相似匹配句对
     (2) isothermal;
     一般等温;
短句来源
     ISOTHERMAL CRYSTALLIZATION IN POLYMERS
     高聚物的等温结晶
短句来源
     The results of non-isothermal sintering tests suggested that LSCF powder possessed good low-temperature sintering activity.
     非等温烧结实验表明该粉体具有良好的低温烧结活性.
短句来源
     Sintered Valve Seat insert
     烧结气门座圈
短句来源
     HEAT TREATMENT OF SINTERED MARTENSITIC STAINLESS STEEL
     烧结马氏体不锈钢的热处理
短句来源
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  isothermal sintering
Effect of aluminate additions on the isothermal sintering kinetics of mechanically activated corundum
      
A method for estimating the duration of isothermal sintering of a powdered body and its final porosity and shrinkage is considered.
      
Dilatometric measurements showed the existence of two sintering mechanisms; these were confirmed by means of isothermal sintering experiments.
      
The isothermal sintering behaviour of a barium magnesium aluminosilicate glass powder at 930°C was investigated using a heating microscope.
      
The crytallite and pore-size evolution during isothermal sintering (400?T?700 °C) of SnO2 xerogels was studied by X-ray line broadening and nitrogen adsorption-desorption isotherms.
      
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This paper gives a short review on the history and the present state of sintring research. It seems to be reasonable to divide the course of the history into three periods. Major emphasis is placed on illustration of the foundation of sintering theory and its current developments. Different studies concerning the mass-transport mechanism in sintering have in detail been described and discussed. These involve viscous flow, vaporisation-cond-ensation, volume,surface and grain-boundary diffusions,and plastic flow.However,...

This paper gives a short review on the history and the present state of sintring research. It seems to be reasonable to divide the course of the history into three periods. Major emphasis is placed on illustration of the foundation of sintering theory and its current developments. Different studies concerning the mass-transport mechanism in sintering have in detail been described and discussed. These involve viscous flow, vaporisation-cond-ensation, volume,surface and grain-boundary diffusions,and plastic flow.However, some modified theories of sintering are dealt with concerning so-called concurrent sintering mechanism. From these, a complex-action theory presented by Huang Peiyun has been specially reported. In consideration of the fact that the sintering occurs by a combination of diffusion, flow and

本文是对烧结研究的历史和现状的简要评述。有理由将烧结研究的发展史划分为三个阶段。重点论述了烧结理论的创立及其现在的发展。详细描述和讨论了有关烧结过程物质迁移机构的各种研究工作,它们包括粘性流动,蒸发凝聚,体积、表面和晶介扩散以及塑性流动。然而,修正过的一些烧结理论是论述那些称作联合烧结机构的,其中特别报导了黄培云提出的综合作用理论。考虑了烧结的发生是扩散、流动和物理一化学反应的联合作用,能导出一个lnln dm=d0/dm-d对1/T的线性方程,其中d0和dm是烧结开始和终了时粉末压制试样的密度,d是在给定时间和绝对温度T经过等温烧结后的瞬时密度。

The sintering behaviour and development in microstructure of the compacts containing pseudomorphs of magnesite have been studied by means of microstructure analysis and topology.The results show that during the isothermal sintering process at 1200℃, the apparent density of compacts decreases and the shrinkage difference between pseudomorph particles and compact is about 6% (by volume),the former shrinks faster. During 1180—1300℃ there is a particle rearrangement process caused by the rapid shrinkage of pseudomorphic...

The sintering behaviour and development in microstructure of the compacts containing pseudomorphs of magnesite have been studied by means of microstructure analysis and topology.The results show that during the isothermal sintering process at 1200℃, the apparent density of compacts decreases and the shrinkage difference between pseudomorph particles and compact is about 6% (by volume),the former shrinks faster. During 1180—1300℃ there is a particle rearrangement process caused by the rapid shrinkage of pseudomorphic aggregates in compact, the 1300℃ isothermal sintering results of M_(<200) compact show that during particle rearrangement process the slop of the straight line of lgΔL/L_0-lgt plot is about 0.8.

本文用显微定量分析法及图论的工具对菱镁矿母盐假相颗粒系统的烧结进行了研究。结果表明,假相颗粒松装坯体在1200℃等温烧结过程中表观密度在降低,假相颗粒比M_(200-265)坯体约有6%的体积超前收缩,M_(<200)坯体在1180—1300℃有一个假相颗粒迅速收缩而使颗粒重排的过程,1300℃等温烧结时该阶段动力学关系lgΔL/L_0-lgt直线的斜率m≈0.8左右。

Hot-pressing is usually used to sinter up to the theoretical density for mostof the covalent materials such as SiC,Si_3N_4,AlN,Sialon….Lower temperature andshorter time allow to control the development of the microstructure,mainly thegrain size.Another useful possibility is to use the hot-pressing operation as a dilatome-ter and the pressure as a subsequent parameter.Then for a choosen material onecan check isobar sintering curves(density versus time at constant pressure and dif-ferent temperatures) or isotherm...

Hot-pressing is usually used to sinter up to the theoretical density for mostof the covalent materials such as SiC,Si_3N_4,AlN,Sialon….Lower temperature andshorter time allow to control the development of the microstructure,mainly thegrain size.Another useful possibility is to use the hot-pressing operation as a dilatome-ter and the pressure as a subsequent parameter.Then for a choosen material onecan check isobar sintering curves(density versus time at constant pressure and dif-ferent temperatures) or isotherm sintering curves (density versus time at constanttemperature and different pressures).During the last twenty years sintering kinetics laws with pressure have beenderived from power laws for the creep of dense materials.Using the isotherm cur-ves (at a constant relative density) one can deduce the dependence of the sinteringrate versus pressure,and then from the theoretical formular to infer what is thesintering step:diffusion,interface reaction,plastic deformations….When differentelementary steps contribute to the overall process,considerations on the diagram ofthe sintering rate versus pressure are sufficient to know exactly how these stepsact:simultaneously or sequentially.Other informations drawn from the influenceof temperature and grain size for different pressures are also useful.These analyses are not geometrical dependent because they are based on kine-tical studies.In this way they are more reliable than those based on integral formssuch as the study of relative shrinkage versus time.

通常采用热压烧结的方法可以把诸如 SiC、Si_3N_4、AlN、Sialon 等多数共价键材料烧结到理论密度。由于热压烧结的温度较低,时间较短,所以材料的显微结构主要是晶粒尺寸能够得以控制。当压力作为辅助参数时,也可把热压设备看作膨胀(收缩)计;而且人们能够对某种选定的材料的热压烧结曲线(当压力恒定,温度不同时,密度随时间的变化关系)和等温烧结曲线(当温度恒定,压力不同时,密度随时间的变化关系)进行试验。在过去的廿年里,加热烧结的动力学定律已经由致密材料蠕变的能力定律予以导出。运用等温曲线(在相对密度恒定的条件下),人们能推导出烧结速率与压力间的关系,而且从理论公式可以判断出烧结步骤究竟是扩散,界面反应,还是(?)性变形等,当各个步骤对整个烧结过程都作出贡献时,只要考虑烧结速率和压力间的关系图,就足以准确地判定这些步骤是如何作用的:是同时起作用,还是分别起作用。另外在不同的压力下,所得到的温度和晶粒尺寸的影响等其它信息,同样是有用的。这些分析不是单纯几何式的依赖关系,因为它们是基于动力学的研究。这样一来,它们比那些基于研究相对收缩率随时间变化关系的积分形式就更加可靠。

 
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