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The AZT and AZTn samples (samples “1”) were sintered in air at 1650 °C with a holding time of 2 h. In order to determine suitable thermal conditions for the formation of aluminum titanate (samples “2”), the green bodies prepared from the Al2O3/TiO2 powder mixture were heat-treated in air at two different temperatures (1500 °C and 1650 °C) and holding times (2 h and 4 h). The crystalline phase content in the heat-treated samples was analyzed by X-ray diffraction. Based on the results, which will be presented in the “Results and Discussion” section, 1650 °C and 4 h holding time were chosen for the synthesis of Al2TiO5. The same temperature and holding time were used for sintering the spinel samples containing pre-synthesized Al2TiO5 and the pure spinel samples (samples “3”). For investigating their resistance to thermal shock, the sintered AZT, AZTn, and spinel samples were heated for 15 min at 950 °C, 1150 °C, or 1200 °C and then quenched by plunging in water which had a temperature of 25 °C. The mechanical strength of as-sintered samples and of samples after one and after five quenching cycles were measured by three-point bending tests (testing instrument TIRAtest 2420, Germany). |
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cmds1907
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根本停不下: 金币+10, 翻译EPI+1, ★有帮助 2014-09-14 14:39:49
根本停不下: 金币+10, 翻译EPI+1, ★有帮助 2014-09-14 14:39:49
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AZT和AZTn样品(样品“1”) 的烧结是在空气中1650°C和保持时间2小时。 为了确定形成钛酸铝(样本“2”) 合适的热条件，从氧化铝/二氧化钛粉末混合物制备生坯(未烧试样)，在空气中以两种不同温度(1500°C和1650°C)热处理且保持时间(2 h和4 h)。热处理样品的结晶相含量由X射线衍射分析(确定)。基于这些结果，它将在“结果与讨论”部分呈现，1650°C和4h保持时间被选择做Al2TiO5的合成。 同样的温度和保持时间被用于烧结含预合成Al2TiO5的尖晶石样品和纯尖晶石样品(样品“3”)。 为研究他们的抗热冲击，烧结的AZT，AZTn和尖晶石样品在950°C、1150°C和1200°C加热15分钟，然后浸入25°C水中淬火。该烧结样品和1和5淬火周期后样品的机械强度，由三点弯曲试验(测试仪器TIRAtest 2420，德国) 测量。 |
2楼2014-09-14 14:31:23
