Two types of diacetatozirconic acid-yttria molds which were labeled as ZYW mold(diacetatozirconic acidyttria mold with traces of ammoium metatungstate in the slurry) and ZY mold(diacetatozirconic acid-yttria mold with...Two types of diacetatozirconic acid-yttria molds which were labeled as ZYW mold(diacetatozirconic acidyttria mold with traces of ammoium metatungstate in the slurry) and ZY mold(diacetatozirconic acid-yttria mold without ammonium metatungstate) were prepared by traditional investment casting.The ZYW and ZY molds were sintered in a carbon-reducing atmosphere and in air,respectively,at 1550℃ for 4 h.Interactions between Ti-47Al-2Cr-2Nb(at%) alloys and the molds at 1650℃ for 30 min were studied.The microstructures of the metalmold interfaces and the presence of inclusions and oxygen contamination in the TiAl bulk alloy were analyzed,and the influences of ammonium metatungstate were discussed.The results indicate that WO_(3)releases O into the TiAl melt,introducing tungsten metal into the alloy matrix.The TiAl alloy ingots cast in the ZY molds had the fewest inclusions and the lowest oxygen contamination.展开更多
基金financially supported by the Beijing Natural Science Foundation (No.2164054)the National Natural Science Foundation of China (No.51301005)。
文摘Two types of diacetatozirconic acid-yttria molds which were labeled as ZYW mold(diacetatozirconic acidyttria mold with traces of ammoium metatungstate in the slurry) and ZY mold(diacetatozirconic acid-yttria mold without ammonium metatungstate) were prepared by traditional investment casting.The ZYW and ZY molds were sintered in a carbon-reducing atmosphere and in air,respectively,at 1550℃ for 4 h.Interactions between Ti-47Al-2Cr-2Nb(at%) alloys and the molds at 1650℃ for 30 min were studied.The microstructures of the metalmold interfaces and the presence of inclusions and oxygen contamination in the TiAl bulk alloy were analyzed,and the influences of ammonium metatungstate were discussed.The results indicate that WO_(3)releases O into the TiAl melt,introducing tungsten metal into the alloy matrix.The TiAl alloy ingots cast in the ZY molds had the fewest inclusions and the lowest oxygen contamination.
