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1998623A vacuum/pressure sintering furnace and many HIP units are of the type which can be operated in vacuum mode or gas pressurizing mode, and switched between the two modes during a run. In an over pressure sintering furnace or an HIP unit, powders in a particulate mold are first sintered in vacuum mode to close porosity (about 95% relative density
For very high-purity, low-deposition rate, low-heat flux conditions, ion pumped systems backed with cryosorption rough pumping are used, since a base pressure of 10 −9 -10 −10 torr is needed. More recently, turbomolecular and cryogenic pumps have been used instead of diffusion pumps where desired (e.g. oil-free systems).
Alibaba.com offers 254 hot isostatic pressing products. About 19% of these are dental consumables, 14% are industrial furnace, and 8% are ceramics. A wide variety of hot isostatic pressing options are available to you, There are 254 hot isostatic pressing suppliers, mainly located in Asia.
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The temperature at each point changes with time at a rate that depends on the surface heat transfer coefficient (HTC) between the media at different temperature and the body, the shape of the body and its thermal conductivity. High HTCs, large dimensions and low thermal conductivities result in large temperature gradients and, thus, large stresses.
The invention discloses a method for preparing nano chromium carbide powder, which is characterized by comprising the following steps of: a, taking 6.6 to 15.0 grams of powdery chromium salt and 1.7 to 4.3 grams of carbonaceous reducing agent in a weight ratio, dissolving the powdery chromium salt and the carbonaceous reducing agent into deionized water or distilled water, and stirring the
Description: Gas or Electric Heat Pit Furnace Wisconsin Oven Corporation designs and manufactures Electrically Heated and Gas Fired Pit Furnaces. A Pit Furnace is ideal for solution treatment, tempering and the heating of any densely packed load carried in a cylindrical basket.
This kind of brazing is very difficult. In order to solve this problem, some alternative methods have been proposed, for example, diamond and cemented carbide are combined with cemented carbide containing cobalt and other active ingredients by high pressure and high temperature pressing to form a multi-layer composite tool head and then brazing.
Microporosity inside some carbides could be observed, which may be due to incomplete carbide-carbide sintering, or to nitrogen elimination during the sintering stage, a common problem when vacuum-sintering cermet materials . On the other hand, FeCrAl-Ti(C,N) sample showed a heterogeneous and very porous microstructure, with low binder