Spherical Ti-45Al-8.5Nb-(W,B,Y)alloy powder prepared by an argon plasma process was near-net shape by gelcasting.In the non-aqueous system,methaerylate-2-hydroxy ethyl,toluene,benzoyl peroxide,and N,N-dimethylaniline were used as the monomer,solvent,initiator,and catalyst,respectively.To improve sintering and forming behaviors,many additives were included in the suspension.The concentrated suspension with a solid loading of 70vol%was prepared.The high Nb-TiAl powder was analyzed by electron microscopy and X-ray difraction.It was found that the green bodies had a smooth surface and homogeneous microstructure,exhibiting a bending strength as high as 50 MPa.After sintering at1480 C for 2 h in vacuum,uniform complex-shaped high Nb-TiAl parts were successfully produced.
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