在900℃,1大气压氧条件下,测定了几种有可能作为热屏蔽涂层组份的氧化物Ceo_2、HfO_2和Y_2O_3在熔融Na_2SO_4—30m/0 NaVO_3中的溶解度与熔盐碱度的关系。Y_2O_3的溶解度高于CeO_2和HfO_2。作为对比,也测定了CeO_2在熔融纯Na_2SO_4中的溶解度。在混合盐熔体中,氧化物形成正钒酸盐酸性溶质,溶解度高于其在相应的酸性纯Na_2SO_4熔体中的溶解度。基于实验结果,提出了合金热腐蚀的修正酸性溶解机理。
The solubiliities of the potential thermal barrier oxide components CeO_2, HfO_2 HfO_2 and Y_2O_3 were measured as a function of solvent basicity for fused Na_2SO_4-30m/0 NaVO_3 at 900℃ and Ⅰ atm O_2, The solubility of Y_2O_3 was higher than those for CeO_2 or HfO_2. For comparison, the solubility of CeO_2 was measured in pure Na_2SO_4. In the mixed sulfate-metavanadate melts, the oxides formed orthovanadate acidic solutes with a solubility much higher than the corresponding acidic sulfates for the pure Na_2SO_4 melt. The results point to a revised mechanism for hot corrosion of alloys by acidic fluxing.
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