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EXERIMENTAL PROCEDURE Three kinds of samples were prepared: 1) two AZT ceramics, herein after referred to as AZT and AZTn, differing in the used zirconia and titania powders; 2) pure aluminum titanate (for adding presynthesized Al2TiO5 to the spinel material); 3) Al2O3-rich magnesium aluminate spinel with or without aluminum titanate. For preparing the AZT ceramic, 95 wt% of the alumina powder Martoxid MR70 (Albemarle: Martinswerk, Germany; d50 0.8 μm), 2.5 wt% of zirconia, and 2.5 wt% of titania powder were mixed. The ZrO2 powder P59 (Saint Gobain; d50 1.1 μm), containing 3.4 wt% of the stabilizing oxide MgO, and the TiO2 powder Tronox TR (Sachtleben, Germany; d50 1.0 μm) were used in the case of the AZT samples, aqueous dispersions of nano-sized zirconia and titania - VPDisp W2650x and VPDisp W740x (Evonik, Germany) - for preparing the AZTn samples. For the synthesis of pure Al2TiO5 by reaction sintering of alumina and titania, the powders Al2O3 Martoxid MR70 and TiO2 Tronox TR were mixed in a molar ratio of 1:1. 12 wt% of pre-synthesized Al2TiO5, which was milled by means of the planetary ball mill “Pulverisette 5” (Fritsch, Germany), and 88 wt% of the powder AR78 (particle size range < 20 μm, d50 1.6 μm; Almatis, Germany) were used for preparing the Al2O3- rich magnesium aluminate spinel samples with aluminum titanate. Additionally, spinel samples without Al2TiO5 were produced. Aqueous suspensions of the different powder mixtures were prepared and homogenized in rotating polyethylene bottles with alumina grinding balls. The suspensions contained suitable amounts of organic dispersant and binding agent. All samples were produced by slip casting in plaster molds. The dimensions of the cavities of the molds, in which the test specimens are formed, were approximately 5 × 4 × 50 mm3. |
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cmds1907
铁杆木虫 (著名写手)
- 翻译EPI: 73
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根本停不下: 金币+15, 翻译EPI+1, ★有帮助 2014-09-14 12:45:07
根本停不下: 金币+15, 翻译EPI+1, ★有帮助 2014-09-14 12:45:07
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实验步骤 三种样品的制备：1)两个AZT陶瓷，在此被称为AZT和AZTn，他们使用不同的氧化锆和二氧化钛粉末；2)纯钛酸铝(对于添加预合成的Al2TiO5到尖晶石材料)；3) 含或不含铝钛酸的富Al2O3铝酸镁尖晶石。 为制备AZT陶瓷，将95 wt %的氧化铝粉末Martoxid MR70(德国雅宝公司：Martinswerk；d50 0.8μm)，2.5 wt %的氧化锆，2.5 wt %的二氧化钛粉末混合。氧化锆粉末P59(法国圣戈班；d50 1.1μm)，包含3.4 wt %的稳定氧化物氧化镁和二氧化钛粉末Tronox TR(德国萨哈利本；d50 1.0μm)被用于AZT样品的情况，纳米级氧化锆和二氧化钛的水分散体 —— VPDisp W2650x和VPDisp W740x(德国赢创)——用于制备AZTn样品。 为合成纯的Al2TiO5，通过氧化铝和二氧化钛粉末反应烧结，粉末氧化铝Martoxid MR70和二氧化钛Tronox TR以摩尔比1:1混合。 12 wt % 预合成的Al2TiO5，借助行星式球磨机“Pulverisette 5”(德国弗里奇)磨碎，而88 wt %的粉末AR78(粒径范围< 20μm d50 1.6μm；德国安迈)被用于制备富氧化铝酸镁铝尖晶石样品。另外，也制备了不含Al2TiO5的尖晶石样品。 制备了不同粉体混合物的水悬浮液，并在具有氧化铝磨球的旋转聚乙烯瓶中均质化。悬浮液中含有适量的有机分散剂和粘合剂。所有样品都是由石膏模具注浆成型法制备。形成试样的模具腔的(外形)尺寸大约为5×4×50 mm3。 |
2楼2014-09-14 12:37:31
