The present invention relates to a pressing arrangement for treatment of articles by hot pressing and in particular to a pressing arrangement for hot isostatic pressing of containers holding substances. The method comprises: placing containers including the substance in a load compartment in the furnace and loading a pressure medium into the pressure vessel and substantially all pressure medium flowing out from the furnace chamber (18) passes at least one substance capturing module, which may include the walls of the guiding passage, at least one condensation element (35) in the guiding passage, filters (41, 43) arranged in the guiding passage, before making contact with the pressure vessel including the top and bottom closures (8, 9).

A multilayer high pressure cylindrical vessel (1) has an inner metal cylinder (3), the inner surface defining an inner volume of the vessel (1) along the radial direction, an outer metal cylinder (4), and one intermediate cylindrical layer sandwiched in space between the inner cylinder (3) and the outer cylinder (4) has and comprising a number of circular wedge segments (51) separated by gaps (52). To improve the vessel there exists an interference fit between the one intermediate cylindrical layer and the adjoining solid cylinders and said gaps (52) are broken by bridges (522) connecting angularly adjacent circular segments (51) and defining two axially adjacent gap sections (521) so that the cylindrical layer is a single cylindrical element (5), and the circular wedge segments (51) separated by gaps (52) both extend in parallel to each other along the longitudinal axis of the vessel (1).

A method in a pressing arrangement is disclosed. The pressing arrangement comprises a pressure vessel arranged to hold pressure medium therein during use of the pressing arrangement, the pressure vessel including a treatment region therein, wherein the treatment region is arranged to accommodate at least one article. The pressing arrangement comprises at least one controllable pressure medium supplying device configured to transport pressure medium during a cooling phase from another region in the pressing arrangement to the treatment region, wherein the temperature of the pressure medium in the other region is lower than the temperature of the pressure medium in the treatment region during at least part of the cooling phase. The method includes adjusting at least one operational parameter of the at least one controllable pressure medium supplying device, to adjust the pressure medium supplying rate thereof.

The present invention relates to a method of manufacturing a light transmitting yttria member by using hot-press sintering. The present invention provides a method of manufacturing light transmitting yttria by performing hot-press sintering on a molded body made of raw material powder including yttria by using a hot-press sintering apparatus, in which the hot-press sintering is performed in a state in which a spacer is interposed between the molded body and a pressing surface of the molded body, and the spacer is made of heat-resistant metal which is substantially unreactive to the molded body at a sintering temperature. According to the present invention, it is possible to manufacture highly compacted light transmitting yttria having light transmittance of 80% by using a single hot-press sintering process.

Large-scale manufacturing of gallium nitride boules using m-plane or wedge-shaped seed crystals can be accomplished using ammonothermal growth methods. Large-area single crystal seed plates are suspended in a rack, placed in a large diameter autoclave or internally-heated high pressure apparatus along with ammonia and a mineralizer, and crystals are grown ammonothermally. The orientation of the m-plane or wedge-shaped seed crystals are chosen to provide efficient utilization of the seed plates and of the volume inside the autoclave or high pressure apparatus.

There is provided an arrangement and a method for handling a load for isostatic pressure treatment in a high-pressure arrangement. The arrangement includes a transportation unit including at least one track for transporting the load into a treatment position for isostatic pressure treatment of the load from a working space outside the high-pressure arrangement. Furthermore, the transportation unit is further arranged for transporting the load from the treatment position to the working space after pressure treatment of the load. The arrangement further includes a partition plane arranged at least partially above the high-pressure arrangement, wherein the working space is provided above the partition plane. The partition plane is arranged to shield the working space from the high-pressure arrangement in the event of a gas leakage of the high-pressure arrangement.

A pressure booster having two cylinders with two pistons, connected such that they operate simultaneously, which can be mounted in a multi-chamber containing simple pressure boosters nested that can be used to increase the pressure depending on the simple boosters being used is provided.

A method for hot isostatic pressing includes the steps of providing or obtaining an article of manufacture, which optionally includes a copper or nickel alloy, disposing the article of manufacture in a shroud, the shroud defining an enclosed volume wherein the article of manufacture is disposed, the shroud being configured as a multi-piece joined structure to retard gaseous mass transport from outside the shroud to inside the enclosed volume, disposing the shroud in a containment vessel of a hot isostatic pressing apparatus and disposing a getter material in the shroud and/or in the containment vessel, and introducing an inert gas at an elevated temperature and pressure into the containment vessel for hot isostatic pressing.

A mold and a method of manufacturing GOS ceramic scintillator by using the mold are provided. The mold comprises: a female outer sleeve having a cavity disposed inside; a plurality of female blocks disposed inside the cavity, the plurality of female blocks being put together to form a composite structure having a vertical through hole; and a male upper pressing head and a male lower pressing head, wherein each of the male upper pressing head and the male lower pressing head has a shape consistent with that of the vertical through hole. The disclosure may reduce defects of the related art in hot-pressing-sintering such as a mold has a short retirement period and a high material waste, significantly reduce the cost for production of the GOS ceramic scintillator, and significantly improve a process economy.

A method (100) for pressing at least one article in anarrangement as well as a pressing arrangement (500). The method comprises providing an article inside a load compartment and feeding a pressure medium into the pressure vessel and increasing (140) the pressure in the load compartment; increasing (120) the temperature and maintaining (150) the increased temperature and the increased pressure for selected periods of time (t.sub.1, t.sub.2); changing (170) the temperature from the first predetermined temperature level to a second predetermined temperature level (T.sub.2); feeding (180) a carbon-containing gas into the pressure vessel; maintaining (190) the second predetermined temperature level for a selected period of time (t.sub.3); reducing(200) the temperature in the load compartment; and discharging (210) the pressure medium from the pressure vessel and reducing (220) the pressure in the load compartment.