Method of manufacturing a hollow article

A method of manufacturing a hollow article ( 10 ) comprising the steps of cold pressing two members ( 30,34 ) to form at least one depression ( 32,36 ) in the members ( 30,34 ). Arranging the two members ( 30,34 ) in abutting relationship such that the at least one depression ( 32,36 ) defines at least one chamber between the two members ( 30,34 ). Sealing ( 41 ) the edges ( 40,42 ) of the two members ( 30,34 ) together to form a core structure ( 44 ). Positioning the core structure ( 44 ) in a mould ( 46 ) to define a cavity ( 48 ) between the external surface ( 50 ) of the core structure ( 44 ) and the internal surface ( 52 ) of the mould ( 46 ), the internal surface ( 52 ) of the mould ( 46 ) substantially defining the external shape of the hollow article ( 10 ). Filling the cavity ( 48 ) between the core structure ( 44 ) and the mould ( 46 ) with a powder material ( 54 ), sealing the open edge of the core structure ( 44 ) to the mould ( 46 ). Removing gases from the cavity ( 48 ) containing the powder material ( 54 ), applying heat and pressures to consolidate the power material to form the hollow article ( 10 ) in the cavity ( 46 ) and removing the mould ( 46 ) from the hollow article ( 10 ).