Synthesis of molten-metal corrosion resistant yttria-based refractory by hot-pressing and densification
Synthesis of molten-metal corrosion resistant yttria-based refractory by hot-pressing and densification
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DOI：
10.1016/j.jeurceramsoc.2015.02.023
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发表时间：
2015-09
影响因子：
5.7
通讯作者：
Son Thanh Nguyen;T. Nakayama;H. Suematsu;Tsuneo Suzuki;M. Nanko;Hong-Baek Cho;M. Huynh;Weihua Jiang;K. Niihara
中科院分区：
文献类型：
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作者：
Son Thanh Nguyen;T. Nakayama;H. Suematsu;Tsuneo Suzuki;M. Nanko;Hong-Baek Cho;M. Huynh;Weihua Jiang;K. Niihara
随着对耐热耐火材料的需求越来越迫切，氧化物弥散强化钢中的主要析出相Y2Ti2O7被认为是一种很有前途的候选材料。本研究首先以Y2TiO7和Y2TiO7为原料，采用固相反应和热压法制备了Y2Ti2O7陶瓷圆盘，然后采用热等静压(HIP)工艺对其进行致密化处理，制备了铝箔夹层结构。X射线衍射物相分析证实熔融Al与陶瓷之间没有反应，而显微结构观察和X射线能谱分析表明致密化提高了Y2Ti2O7陶瓷的抗熔融金属渗透能力。研究结果可为坩埚、铸造模具的设计提供良好的参考数据。
When the demand for finding new refractory materials which can sustain molten metal at very high temperature becomes imperative, Y2Ti2O7, the main phase precipitated in oxide dispersion strengthened (ODS) steel, has been considered a promising candidate. In this study, ceramic discs of Y2Ti2O7were firstly sintered from Y2O3and TiO2by solid-state reaction and hot-pressing method, and then densified by Hot-isostatic-pressing (HIP) before being employed to fabricate sandwiched structures with aluminum (Al) foils. The phase identification by X-ray diffraction confirmed no reaction between the molten Al and the ceramics, while the micro-structural observation and energy dispersive X-ray spectroscopy results revealed that the densification has improved the resistance of Y2Ti2O7ceramics against molten-metal penetration. The result of this study should be good reference data for designing for crucible, casting molds.