Interfacial　reactions　between　Ti-47Al-2Cr-2Nb　(at.　%)　alloys　and　yttria　moulds　with　diacetatozirconic　acid　and　yttria　sol　as　binders　were　studied.　Certain　interfacial　reactions　between　TiAl　alloy　and　diacetatozirconic　acid　-　yttria　mould　occurred　to　form　new　Y-Al　oxide　phase　(Y4Al2O9)　on　the　interface　and　in　the　bulk　of　TiAl　alloy,　and　the　oxygen　and　yttrium　increments　were　0.34　wt.　%　and　0.0067　wt.　%　respectively.　TiAl　alloy　did　not　react　with　yttria　sol　-　yttria　mould　to　form　new　phase,　however　widespread　Y2O3　inclusions　dispersed　in　the　alloy　bulk,　and　the　oxygen　and　yttrium　increments　were　0.12　wt.　%　and　0.14　wt.　%　respectively.　The　analysis　results　indicate　that　binders　have　important　influences　on　mould　stability　and　alloy　contaminations.