(1. 上海大學(xué) 材料科學(xué)與工程學(xué)院，省部共建高品質(zhì)特殊鋼冶金與制備國家重點(diǎn)實(shí)驗(yàn)室，上海市鋼鐵冶金新技術(shù)開發(fā)應(yīng)用重點(diǎn)實(shí)驗(yàn)室，上海 200072； 2. 上海特種鑄造工程技術(shù)研究中心，上海 201605； 3. 舍弗勒有限公司，太倉 215400)
摘 要: 以BaCO3、ZrO2和Y2O3為原料的6種配比混合料在1200 ℃經(jīng)固相合成Y2O3摻雜BaZrO3粉體，并經(jīng)冷等靜壓成型后在1750 ℃燒結(jié)成圓片。利用X射線衍射儀(XRD)和掃描電子顯微鏡(SEM)結(jié)合能譜分析(EDS)分析不同Y2O3摻雜量對BaZrO3粉體組成及其對BaZrO3圓片的顯微組織結(jié)構(gòu)和燒結(jié)性能的影響。結(jié)果表明：Y2O3摻雜BaZrO3主要由BaZrO3和Ba2YZrO6構(gòu)成；隨著Y2O3摻雜量的增加，Ba2YZrO6含量逐漸增加，并出現(xiàn)團(tuán)聚現(xiàn)象；同時，BaZrO3晶粒生長受到抑制，導(dǎo)致圓片表面疏松多孔，致密度降低。當(dāng)原料摩爾比n(BaCO3):n(ZrO2):n(Y2O3)=0.48:0.47:0.1時，所獲圓片相對密度達(dá)到97.1%。使用該配比粉料制備坩堝感應(yīng)熔煉TiNi合金后，合金與坩堝無界面反應(yīng)層存在，也未見明顯坩鍋組成元素向合金擴(kuò)散現(xiàn)象，說明Y2O3摻雜BaZrO3是一種非常有潛力的鈦合金熔煉制備用耐火材料。
關(guān)鍵字: 氧化釔；鋯酸鋇；摻雜；顯微組織；界面反應(yīng)
（1. State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China; 2 Shanghai Special Casting Engineering Technology Research Center, Shanghai 201605, China; 3. Sflyxgs. Chinaepu. Co., Ltd., Taicang 215400, China）
Abstract:Six ratios of Y2O3 doped BaZrO3 powder were prepared from BaCO3, ZrO2 and Y2O3 as raw materials by solid reaction method at 1200 ℃. Then, the pellets were fabricated by cold isostatic pressing and sintered at 1750 ℃. The effect Y2O3 on the constituents of BaZrO3 powder and microstructure evolution of BaZrO3 pellets was studied by using the X-ray diffraction (XRD) and scanning electron microscopy (SEM) combined with EDS. The results show that the Y2O3 doped BaZrO3 mainly consists of two phases, i. e., BaZrO3 and Ba2YZrO6. The content of Ba2YZrO6 increases gradually and the phenomenon of aggregation appears as the amount of Y2O3 increasing. At the same time, the growth of BaZrO3 grains are restrained, the grain boundaries of BaZrO3 and Ba2YZrO6 transform from regular polyhedron boundary to irregular amorphous grain boundary, which make the surface of the pellets porous and lower dense. When the mole ratio of BaCO3, ZrO2 and Y2O3 is about 0.48：0.47：0.1, the relative density of pellets reaches to 97.1%. This proportion of powder was prepared into crucible and utilized to melt TiNi alloys using vacuum induction. There is no obvious interaction layer and elements diffusion between the crucible and the melt, which may imply that the Y-doped BaZrO3 refractory is a promising candidate for melting titanium alloys.
Key words: yttria; barium zirconate; doping; microstructure: interfacial reaction
