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high sintering    
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  较高的烧结
    TEM micrograph shows that the particles size is 30~40 nm, with high sintering activity.
    透射电镜(TEM)结果表明,粉体尺寸在30~40nm之间,具有较高的烧结活性。
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    With increasing TiN additions, the bonding strength increased to the maximum values at 4%TiN content during low sintering temperature and at 6%TiN content during high sintering temperature, respectively, and then decreased.
    随TiN含量的增加,金属陶瓷的抗弯强度均出现先增加后降低的规律,但在较低的烧结温度下,抗弯强度在TiN含量为4%时达到最大值,而在较高的烧结温度下,抗弯强度在TiN含量为6%时达到最大值;
短句来源
    The results show that low carbon and oxygen contents and high sintering density can be obtained by controlling sinter atmosphere and optimizing sinter temperature,which all lead to the improvement of corrosion resistance property of the sintered stainless steels.
    结果表明通过控制烧结气氛,优化烧结温度,可以使烧结体具有较低的氮氧含量和较高的烧结密度,从而获得良好的耐蚀性。
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  high sintering
Abnormal grain growth (AGG) is preferentially found at high sintering temperatures in specimens processed from powder mixtures with a wide particle size distribution.
      
At a high sintering temperature, they are mainly dissolved in the parent metal, and the contact regions turn into the direct metal/metal bonding.
      
The main reasons for shrinkage are the laser's very fast heating rates, short sintering times, and relatively high sintering temperatures.
      
An opportunity will thus arise in particular to obtain fuller information on the initial stage of sintering of powder compacts, which are characterized by high sintering activity.
      
Obviously, the micron-sized powders exhibited high sintering activity.
      
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Abnormal setting of portland cement doped with CaF_2 was studied by setting time measurement, XRD, chemical analysis, and wave dispersive X-ray analysis. Experimental results show that fast or flash setting is attributed to quick hydration of C_(11)A_7·CaF_2 and slow setting is due to the solution of more F~- in alite. Abnormal setting of portland cement doped with CaF_2 is related to the distribution and amounts of F~- in various phases of clinker. More C_(11)A_7-CaF_2 will be formed and fast or flash setting...

Abnormal setting of portland cement doped with CaF_2 was studied by setting time measurement, XRD, chemical analysis, and wave dispersive X-ray analysis. Experimental results show that fast or flash setting is attributed to quick hydration of C_(11)A_7·CaF_2 and slow setting is due to the solution of more F~- in alite. Abnormal setting of portland cement doped with CaF_2 is related to the distribution and amounts of F~- in various phases of clinker. More C_(11)A_7-CaF_2 will be formed and fast or flash setting occurs if more F~- are solved in the interstitial phase. However, if more F~- are solved in silicate phase, especially in alite, content of C_(11)A_7·CaF_2 in the clinker will decrease, then setting will become normal or retarding. Higher sintering temperature, fast cooling, doping with MgO and higher CaF_2 addition as well as higher KH, lower IM modulus will increase F~- content solved in the solution of alite and normal or retarding setting will occur; otherwise F~- content in interstitial phase and C_(11)A_7·CaF_2 content in the clinker will increase, then fast or flash setting will occur.

本文用测定凝结时间、XRD分析、化学分析及波谱分析等手段研究了含氟硅酸盐水泥的不正常凝结问题。结果表明,含氟硅酸盐水泥的不正常凝结与氟在熟料各矿物中的分布有关。采用在生料中掺入MgO、多掺CaF_2,并对熟料采用高KH值、低IM值、高温煅烧、快速冷却等方法均可使A矿中固溶较多的氟,从而有利于水泥的正常凝结或使凝结变慢;反之,则使A矿中固溶的氟减少,有利于形成较多的C_(11)A_7·CaF_2,从而引起水泥急凝。

Microwave reflectivity of epoxy matrix composite containing Mn-Zn ferrite sintered at different temperatures such as 1100℃ , 1200℃ , 1300℃ , 1400℃ and 1500℃ is measured in the frequency range of 11.0GHz to 18.0 GHz. The phase constitution of the Mn-Zn ferrite is analyzed by X-ray diffraction. It is found that Mn-Zn ferrites sintered at different temperatures have the same main phases, while the relative content of the same kind is different. The higher the sintering temperature is, the more content...

Microwave reflectivity of epoxy matrix composite containing Mn-Zn ferrite sintered at different temperatures such as 1100℃ , 1200℃ , 1300℃ , 1400℃ and 1500℃ is measured in the frequency range of 11.0GHz to 18.0 GHz. The phase constitution of the Mn-Zn ferrite is analyzed by X-ray diffraction. It is found that Mn-Zn ferrites sintered at different temperatures have the same main phases, while the relative content of the same kind is different. The higher the sintering temperature is, the more content Fe3O4has, and the less centent α-Fe2O3and γ-Fe2O3have. The results also show that the ferrite prepared at 1500℃ has better microwave absorbing property than those prepared at other temperatures. It may be concluded that the variation of Sintering temperature results in the change of hysteresis loss and dielectric loss of Mn-Zn ferrite. The electron exchange effect between Fe2+and Fe3+ becomes stronger and, the turbulent loss is more remarkable due to the formation of excessive Fe2+in deoxidizing of Fe2O3at higher sintering temperature.

研究Mn-Zn铁氧体的烧结温度对其微波吸收性能的影响,选用了5种烧结温度制备铁氧体,并对其作了X-射线衍射相组成分析。实验表明采用1500℃高烧结的铁氧体较其他温度下烧结的吸波性好。

The effect of small amount of Al_2O_3 additive on the ultrafineness of grain, phase composition and sinterability of ZrO_2(Y_2O_3) powders was investigated. It is found that the Al_2O_3 additive has considerable effects on the powder properties mentioned above. Tetragonal ZrO_2 contents of the powder and the sintered body will increase compared with the content of those without Al_2O_3 because of fineness of grain and constraint by Al_2O_3, a rigid phase with high Young's modulus. In addition, a solid...

The effect of small amount of Al_2O_3 additive on the ultrafineness of grain, phase composition and sinterability of ZrO_2(Y_2O_3) powders was investigated. It is found that the Al_2O_3 additive has considerable effects on the powder properties mentioned above. Tetragonal ZrO_2 contents of the powder and the sintered body will increase compared with the content of those without Al_2O_3 because of fineness of grain and constraint by Al_2O_3, a rigid phase with high Young's modulus. In addition, a solid solution of very small quantity of Al_2O_3 (<0.5wt%) into ZrO_2 grain results in the decrease of sintering temperature; but excessive amount of Al_2O_3 locates at the boundary between ZrO_2 grains and hinders the grain growth of ZrO_2, as well as densification of the body under the same sintering conditions. As a result, a higher sintering temperature would be needed.

研究少量Al_2O_3对ZrO_2粉末超细化及相组成,烧结性影响,结果表明:①少量Al_2O_3对粉末上述性能有明显影响。Al_2O_2抑制了ZrO_2的晶化反应,使晶粒细化,增加了四方相含量;②极少量Al_2O_3(<0.5wt%)在烧结过程固溶于ZrO_2颗粒中可降低烧结温度,而过量Al_2O_3则处于晶界上,抑制ZrO_2晶粒生长,使烧结体晶粒细化,但同时也阻碍了烧结致密化;③颗粒的细化及高弹性模量的Al_2O_3镶嵌于晶界处,明显地抑制了四方ZrO_2向单斜相转化。

 
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