Two　types　of　diacetatozirconic　acid–yttria　molds　which　were　labeled　as　ZYW　mold　(diacetatozirconic　acid–yttria　mold　with　traces　of　ammonium　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　°C　for　4　h.　Interactions　between　Ti–47Al–2Cr–2Nb　(at%)　alloys　and　the　molds　at　1650　°C　for　30　min　were　studied.　The　microstructures　of　the　metal–mold　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　WO3　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.　©　2017　The　Nonferrous　Metals　Society　of　China　and　Springer-Verlag　Berlin　Heidelberg