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ABSTRACT Oxide refractories - two types of AZTceramic and an Al2O3-rich magnesium aluminate spinel ceramic containing aluminum titanate - have been investigated. The AZT ceramics were prepared from a 95 wt% Al2O3 - 2.5 wt% ZrO2 - 2.5 wt% TiO2 powder mixture. The ceramics sintered at 1650 °C had a high thermal shock resistance. Their strength after quenching from 1200 °C was higher than the original strength after sintering, both after one and five quenching cycles. The thermal shock resistance of the Al2O3-rich spinel ceramic was improved by the addition of 12 wt% of pre-synthesized aluminum titanate. Higher strength after thermal shock in comparison with the assintered samples was not reached in this case, but compared with the pure spinel ceramic, the retained strength after repeated quenching from 950 °C or 1150 °C was higher when the ceramic contained aluminum titanate. |
鐵桿木蟲 (著名寫手)
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摘要 研究了氧化物耐火材料—兩種AZT 陶瓷和一種含鈦酸鋁的富Al2O3鋁酸鎂尖晶石陶瓷。 從一個95 wt %(質量百分比)氧化鋁- 2.5 wt %氧化鋯- 2.5 wt %二氧化鈦的粉末混合物制備了AZT陶瓷。1650°C燒結的陶瓷具有高的耐(抗)熱震性。其1200°C淬火后的強度高于燒結后的原始強度,在一個和五個淬火周期。 通過添加12 wt % 預合成的鋁鈦酸,富Al2O3尖晶石陶瓷的抗熱震性提高。與燒結樣品相比,熱沖擊后的高強度沒有在本例中達到,但與純尖晶石陶瓷相比,當陶瓷含鈦酸鋁時,從950 °C或1150 °C重復淬火后的殘留強度更高。 |
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