| 摘要 |
A dehydration-sintering furnace includes a muffle tube that accommodates therein the porous preform, a heater that heats the porous preform from outside of the muffle tube, a furnace body that accommodates the heater at an outer periphery of the muffle tube. When a gas required for dehydrating and sintering the porous preform is supplied in the muffle tube, and a pressure in the muffle tube is measured, an average value of the pressure in the muffle tube P 0 and a standard deviation of the pressure in the muffle tube sigma 0 are controlled to satisfy a relation P 0 -3xsigma 0 >0.
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