(1. 上海大學 材料科學與工程學院 省部共建高品質(zhì)特殊鋼冶金與制備國家重點實驗室，上海 200072；
2. 上海大學 材料基因組工程研究院，上海 201900；
3. 上海特種鑄造工程技術(shù)研究中心，上海 201605)
摘 要: 使用傳統(tǒng)固相合成的Y2O3摻雜與未摻雜的BaZrO3粉料，運用冷等靜壓和固相燒結(jié)技術(shù)，制備BaZrO3和Y摻雜的BaZrO3坩堝，并用其熔煉富鈦合金(Ti2Ni，含鈦量63%，質(zhì)量分數(shù))。研究Y2O3摻雜對BaZrO3坩堝侵蝕層及組織形貌的變化，合金熔體受耐火材料元素污染量的變化以及Y2O3摻雜BaZrO3坩堝抵抗鈦熔體的侵蝕性。結(jié)果表明：1500 ℃時，Ti2Ni熔體對摻雜Y2O3的BaZrO3坩堝侵蝕層厚(1700 mm)，小于未摻雜的BaZrO3侵蝕層厚度(2000 mm)；Y摻雜BaZrO3坩堝內(nèi)壁晶粒相對完整，僅部分晶界受熔體侵蝕而模糊，未摻雜的BaZrO3坩堝晶粒受鈦熔體侵蝕及沖刷，出現(xiàn)層片狀組織，且內(nèi)壁結(jié)構(gòu)疏松；隨著保溫時間從5 min增至15 min時，Y摻雜BaZrO3坩堝熔煉后Ti2Ni合金中的O和Zr元素均達到平衡；而未摻雜的BaZrO3熔煉后Ti2Ni中O和Zr含量隨保溫時間增加而增加。熱力學計算也支持上述結(jié)論，說明耐火材料在Ti2Ni熔體中的溶解的進行表明促進BaZrO3坩堝-合金界面反應(yīng)，Y2O3摻雜能改善BaZrO3穩(wěn)定性，增強抗鈦熔體的侵蝕性，降低其在鈦合金中的溶解。
關(guān)鍵字: 鋯酸鋇；氧化釔；摻雜；鈦合金；穩(wěn)定性；抗侵蝕性
（1. State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferro metallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;
2. Materials Genome Institute, Shanghai University, Shanghai 201900, China;
3. Shanghai Special Casting Engineering Technology Research Center, Shanghai 201605, China）
Abstract:The crucibles prepared by Y-doped BaZrO3 and undoped BaZrO3 powders were synthesized by a traditional solid-state and cold isostatic pressing method, and then used the two crucibles melted titanium rich alloys(Ti2Ni, 63%Ti, mass fraction). The effect of Ti2Ni melt on the erosion changes and the microstructures of BaZrO3 and Y-doped BaZrO3 crucibles at different melting times, as well as the contamination of the melt by the refractory, and its erosion resistance of titanium melts were investigated. The results show that the thickness 1700 mm of erosion layer of Y-doped BaZrO3 crucible is less than that (2000 mm) of BaZrO3 crucible at 1500 ℃. The grains of the Y-doped BaZrO3 are relatively complete, and the part of grain boundaries are not clear because of the melt erosion, while the grains of the un-doped BaZrO3 are eroded by titanium melts, and the lamellar and loose structure occurs. When the holding time increases from 5min to 15 min, the O and Zr elements in the Ti2Ni alloy after Y-doped BaZrO3 are all in equilibrium. After melting of the up-doped BaZrO3 the O and Zr contents increase with the holding time increasing. The thermodynamic calculations support the above conclusions, and which indicates the dissolution of refractory in the Ti2Ni melts is the main reason for the alloy-crucible interaction. The doping Y2O3 into BaZrO3 can improve the stability of BaZrO3, enhance the erosion resistance of titanium melts and reduce its dissolution in titanium alloys.
Key words: barium zirconate; yttrium oxide; dopant; titanium alloy; stability; erosion resistance
