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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(chóng) (著名寫(xiě)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(gè)95 wt %(質(zhì)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(jié)的陶瓷具有高的耐(抗)熱震性。其1200°C淬火后的強(qiáng)度高于燒結(jié)后的原始強(qiáng)度,在一個(gè)和五個(gè)淬火周期。 通過(guò)添加12 wt % 預(yù)合成的鋁鈦酸,富Al2O3尖晶石陶瓷的抗熱震性提高。與燒結(jié)樣品相比,熱沖擊后的高強(qiáng)度沒(méi)有在本例中達(dá)到,但與純尖晶石陶瓷相比,當(dāng)陶瓷含鈦酸鋁時(shí),從950 °C或1150 °C重復(fù)淬火后的殘留強(qiáng)度更高。 |
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