The jig for firing and its manufacturing method

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PROBLEM TO BE SOLVED : To prevent uneven burning of a burnt product and sticking of the product to a burning fixture from occurring during burning by providing the burning fixture made of a molybdenum corrugated plate with a plate thickness within a specified range, a pitch between ridges within a specified range and a surface roughness within a specified range. SOLUTION : Molybdenum plates having a thickness of 0.2, 0.5, 1.0, 2.0mm are produced, and surfaces of the plates are finished to a roughness of Ra 1.0 to 4.0μm and Rmax 10 to 40μm by a horning treatment. Then, the molybdenum plates are made to pass through rolls formed in a shape of a gear to form the molybdenum plates in a corrugated shape having a thickness of 0.2 to 2.0mm and a pitch between ridges of 3 to 20mm. By using a burning fixture 6 made of the molybdenum plates thus prepared, a tubular burnt product 1 made of ceramic or rare earth magnetic material is burnt. Uneven burning of the burnt product 1 and sticking of the burnt product 1 to the burning fixture 6 are prevented from occurring.