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首页> 外文期刊>日本セラミックス協会学術論文誌 >Optimum Sintering and Annealing Conditions for #beta#-FeSi_2 Formed by Slip Casting
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Optimum Sintering and Annealing Conditions for #beta#-FeSi_2 Formed by Slip Casting

机译：滑模铸造形成的＃beta＃-FeSi_2的最佳烧结和退火条件

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摘要

Optimum sintering and annealing conditions for iron-disilicide thermoelectric material were determined. The chemical compositions of the starting material were Fe_(0.91)Mn_(0.09)Si_2 and Fe_90.98)Co_(0.02)Si_2. The mean particle diameter of both powders was about 6 #mu#m. The powder concentration was 77 mass percent, and the hydrogen exponents (= pH) of Fe_(0.91)Mn_(0.09)Si_2 and Fe_(0.98)Co_(0.02)Si_2 were 8.5 and 7, respectively. The green body was demolded in 1 h, and then was dried at 353 K for 8 h in air. Sintering was performed in the temperature range from 1423 to 1453 K for 3 h, and annealing, in the temperature range from 973 to 1143 K for 14 h. Vacuum was used for both sintering and annealing. The relative density increased with increasing sintering temperature. The relative density of the Fe_(0.91)Mn_(0.09)Si_2 specimen was higher than that of the Fe_(0.98)Co_(0.02)Si_2 specimen, because the solidus temperature of Fe_(0.91)Mn_(0.09)Si_2 is lower than that of Fe_(0.98)Co_(0.02)Si_2. The grain size of the c-phase in the specimen sintered at 1453 K was much larger than that in the specimen sintered at 1443 K, and is covered with a thick #beta#-phase layer, which restrains the reaction of #epsilon# + Si->#beta#. The optimum annealing temperature was at 1123 K, at which the eutectoid reaction, #alpha#->#beta# + Si, and the subsequent reaction, #epsilon# + Si-#beta#, mainly occurred. Some compacts were formed by cold isostatic pressing (CIP) or uniaxial pressing. Density and thermoelectric properties of the specimen formed by slip casting were better than those prepared by uniaxial pressing and almost the same as those prepared by CIP. Thus, slip casting is regarded as a superior forming method to conventional methods such as CIP and uniaxial pressing.
机译：确定了二硅化铁热电材料的最佳烧结和退火条件。起始原料的化学组成为Fe_（0.91）Mn_（0.09）Si_2和Fe_90.98）Co_（0.02）Si_2。两种粉末的平均粒径为约6＃μm。粉末浓度为77质量％，Fe_（0.91）Mn_（0.09）Si_2和Fe_（0.98）Co_（0.02）Si_2的氢指数（＝ pH）分别为8.5和7。生坯在1小时内脱模，然后在353 K下于空气中干燥8小时。在1423至1453 K的温度范围内进行烧结3小时，然后在973至1143 K的温度范围内进行退火14小时。真空用于烧结和退火。相对密度随着烧结温度的升高而增加。 Fe_（0.91）Mn_（0.09）Si_2标本的固相线温度低于Fe_（0.91）Mn_（0.09）Si_2标本的相对密度高于Fe_（0.98）Co_（0.02）Si_2标本的相对密度Fe_（0.98）Co_（0.02）Si_2的原子数。在1453 K烧结的样品中c相的晶粒尺寸比在1443 K烧结的样品中c相的晶粒尺寸大得多，并覆盖有厚的＃beta＃相层，从而抑制了＃epsilon＃+的反应。 Si->＃beta＃。最佳退火温度为1123 K，在该温度下共析反应主要发生#alpha＃->＃beta＃+ Si，随后发生的反应是＃epsilon＃+ Si-＃beta＃。一些压坯是通过冷等静压（CIP）或单轴压制成型的。通过滑模铸造形成的样品的密度和热电性能优于通过单轴压制制备的样品，并且与通过CIP制备的样品几乎相同。因此，与传统的方法（如CIP和单轴压制）相比，滑模铸造被认为是一种更好的成型方法。

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