| 摘要 |
A hot isostatic pressing apparatus equipped with a pressure vessel, a heat-insulating layer provided within the pressure vessel and a heating unit disposed inside the heat-insulating layer, in which the heating unit is formed of a cylindrical, self-standing and single-stage heater mounted on an electrical insulator, which is in turn provided in a low-temperature zone of the pressure vessel, and a convection-promoting cylinder provided inside the heater with its lower part supported on the electrical insulator, wherein the upper extremity of the convection-promoting cylinder is located above the upper extremity of the heater, and the convection-promoting cylinder defines a gas flow passage in the lower part thereof. Owing to the provision of the convection-promoting cylinder, the effective height of the uniform temperature zone, namely, the treatment spacing in the pressure vessel is increased by 1.5-3.0 times as compared with a conventional hot isostatic pressing apparatus equipped with no such convection-promoting cylinder and the single-stage heater allows for a reduction in the overall size of the pressing apparatus.
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