Abstract: An FRM disc preform for manufacturing an FRM disc used as compressor rotors f aircraft engines. The FRM disc preform (1) of the present invention includes a reinforcing fiber (2) wound in a spiral shape with flat faces and a spray coating (7) of a matrix metal formed on one of the flat faces of the spirally wound reinforcing fiber (2) to hold the spiral shape by fixing the upper layer and the lower layer of the spiral. Thereby, the spiral shape is held tightly without collapsing and handling in a laminating process and a combined forming process becomes extremely simplified, and thus the manufacturing efficiency and accuracy of the FRM disc can be enhanced.

Abstract: A brazing procedure including the steps of retaining a component (7) having a brazing section (2) therein by means of a die assembly (3, 4) which is compressed by a hot press (8), admitting (6) an inert gas into the component to produce an inert atmosphere inside the component having a pressure which is higher than the outer pressure, and then heating (5) the component thereby brazing the section. A brazing clearance is maintained at a proper amount prior to brazing, and the outer configuration of the component is maintained with enhanced precision. The brazing operation is also advantageous due to its reduced operating cost.

Abstract: A method for manufacturing a mold to be used when the powder a titanium alloy is filled in the mold and the powder is hot pressed under static water pressure; the improvement is that the mold is manufactured by subjecting a titanium alloy plate having the same composition as the aforementioned titanium alloy powder to super-plastic shaping.