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高純度アルミナセラミックスにおけるミリ波・サブミリ波焼結の研究

机译：高纯氧化铝陶瓷中毫米波和亚毫米波烧结的研究

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The enhancement of sintering rates and other solid state reactions duringmicrowave heating on a variety of ceramics have been reported in literatures. Theseempirical observations of microwave enhancement have been broadly called`microwave effect`. However, there has been little published work which directlycompares the effects of microwave frequency and green sample`s properties onmicrowave effect on ceramics. Therefore, this dissertation describes a series ofexperimental to investigate effects of microwave frequency and green sample onalumina.To study microwave frequency dependence, extension of microwave, up to 300GHz (submillimeter waves) were applied and sintering by using 2.45 GHz, 28 GHz, and300 GHz was performed. And to study the effects of green samples, both cold isostaticpressed (CIPed) and uncold isostatic pressed (unCIPed) alumina samples, wereprepared.The experimental results obtained from this study indicated that the microwaveprocessing of alumina was strongly dependent on microwave frequency and greensamples. Since microwave frequency effect on alumina densification seemed todecrease at submillimeter waves (SMMW), the most effective microwave frequency forthe densification of alumina should exist below 300 GHz.The decreased densification attributed to decelerated diffusion. This wasconfirmed by a slower grain growth and an increased of apparent activation energyestimation in SMMW sintering. Mechanism responsible for the decrement in SMMWsintering may attribute to decrease in microwave effect or different the transport pathsuch as volume diffusion mechanism instead of mainly grain boundary diffusion asusually reported in microwave sintering. This could lead to a decelerated flux and adecreased densification during SMMW sintering as observed in this work.As for the effect of green samples, the effect of CIP on SMMW and MMWsintered alumina was higher than that in conventionally sintered samples. This suggeststhat microwaves preferred heating grain boundary areas to heating within the grains.The experiment results also revealed that the effect of CIP on SMMW sintered aluminawas higher than that in MMW. Such an effect was probably due to the strongerSMMW-grain boundary interaction compared to that found in MMW. The increase ofthe number of grain boundaries on CIPed samples had a bigger effect inSMMW-alumina interaction than that in MMW.
机译：文献报道了在各种陶瓷上微波加热过程中烧结速率和其他固态反应的提高。这些对微波增强的经验观察被广泛地称为“微波效应”。然而，很少有发表的工作可以直接比较微波频率和绿色样品的特性对微波对陶瓷的影响。因此，本文描述了一系列研究微波频率和绿色样品对氧化铝的影响的实验。为了研究微波频率依赖性，应用微波扩展，高达300GHz（亚毫米波），并使用2.45 GHz，28 GHz和300 GHz进行烧结。被执行了。为了研究绿色样品的效果，制备了冷等静压（CIPed）和非等静压（未CIPed）氧化铝样品。从该研究获得的实验结果表明，氧化铝的微波处理强烈依赖于微波频率和绿色样品。由于微波频率对氧化铝致密化的影响似乎在亚毫米波（SMMW）下降，因此最有效的微波致密化微波频率应在300 GHz以下，致密化降低归因于扩散速度的降低。 SMMW烧结过程中晶粒生长较慢和表观活化能估计值增加证实了这一点。引起SMMW烧结减少的机理可能归因于微波效应的降低或不同的传输路径，例如体积扩散机理，而不是微波烧结中通常报道的主要是晶界扩散。如这项工作所观察到的那样，这可能导致SMMW烧结过程中的通量下降和致密化降低。关于绿色样品的影响，CIP对SMMW和MMW烧结氧化铝的影响要高于常规烧结样品。实验结果还表明，CIP对SMMW烧结氧化铝的影响要高于MMW。这样的效果可能是由于与MMW中发现的更强的SMMW-晶粒边界相互作用。 CIPed样品中晶界数量的增加对SMMW-氧化铝相互作用的影响大于对MMW的影响。

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    I Nyoman Sudiana;

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  • 年度 2013
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