Abstract:
A method of sintering compacts of metals, ceramics and the like in powder form. At least the surface portion of the compact is sintered in a plasma atmosphere having a pressure of 10 Torr or less thereby eliminating the open voids and then the compact is subjected to a hot isostatic press process.
Abstract:
There is disclosed a method for eliminating an organic dispersion medium from a molded product obtained by plasticizing-molding or casting-molding of metallic and/or ceramic powders wherein the elimination is by extraction by liquid carbon dioxide at a temperature not lower than -30.degree. C. and not higher than -31.1.degree. C. The method prevents nonuniform volumetric decrease of the molded product to be otherwise caused by the extraction of the organic dispersion medium, while also making it possible to completely eliminate the organic dispersion medium without causing residual strain or deformation in the molded product.
Abstract:
A method for eliminating a dispersion medium from a molded product obtained by plasticizing-molding or casting-molding one or more of metallic and ceramic powders, wherein the elimination process is carried out in a supercritical liquid carbon dioxide atmosphere without heating to higher temperatures.
Abstract:
A method and an apparatus for continuously manufacturing non-fired pellets, which comprise: continuously supplying green pellets containing a carbonating binder into a vertical type reactor to continuously pass the green pellets sequentially through a predrying zone, a carbonating zone and a drying zone in the vertical type reactor; blowing a predrying gas having a relative humidity of up to 70% and a temperature of from 40.degree. to 250.degree. C. into the predrying zone to predry the green pellets therein until the water content of the green pellets in the predyring zone falls within the range of from 1 to 7 wt. %; blowing a carbonating gas comprising carbon dioxide gas of from 5 to 95 vol. % and saturated steam of from 5 to 95 vol. % and having a temperature of from 30.degree. to 98.degree. C. into the carbonating zone to carbonate the carbonating binder contained in the green pellets therein; and blowing a drying gas at a temperature of from 100.degree. to 300.degree. C. into the drying zone to harden the green pellets therein, thereby continuously manufacturing non-fired pellets.
Abstract:
A tetrafluoroethylene-type fluoroplastic powder is added and mixed with a metal powder and the mixture is shaped. The compact is heated in a nonoxidizing atmosphere and the oxides on the surface of the metal particles are converted and removed as gaseous fluorides. Alternatively, after the oxides are converted to solid or liquid fluorides, the fluorides are reduced by hydrogen and then they are removed as gaseous reaction products. Thereafter, the compact is sintered.
Abstract:
The invention is concerned with the method of compression molding a metallic or ceramic powders. The method includes the step of maintaining a negative pressure within a first mold of noncompactable powders for intimately contacting on its inner surface a pouch-like member of thin-walled resilient material for producing a second mold, and the step of compactly charging starting powders into the second mold and exhausting air from and sealing the second mold, taking out a pre-molded body of the metallis or ceramic powders together with the second mold and the step of processing the pre-molded body by a cold or hot isostatic press.
Abstract:
There is provided a method of blast furnace operation utilizing selective recycling of peripheral gas stream wherein the number of outlet ports for peripheral gas stream and the position of the gas outlet ports relative to the inlet ports for reducing gas are optimalized and the content of nitrogen in the recycling gas and the content of nitrogen in the reducing gas to be injected are controlled within the respective predetermined ranges.
Abstract:
A mobile phone terminal (electronic device) includes a first touch panel and a second touch panel for displaying an object corresponding to an executable function and detect a touch on the object. The mobile phone terminal also includes a control unit that, in a state where the object is displayed on the first touch panel or the second touch panel, when the touch on the object is detected and then a movement of the touch is detected and if the first touch panel or the second touch panel is in a movement direction of the touch, displays a screen provided by a function corresponding to the object on the first touch panel or the second touch panel in the movement direction of the touch.
Abstract:
Described is a method for the production of ferrochromium and a rotary furnace employed in such method. Raw chromium ores, fluxes and carbonaceous reducing agent(s) are charged into a rotary furnace into which oxygen or oxygen-enriched air is blown to effect smelting reduction. Hot exhaust gases from the rotary reducing furnace are used for pre-heating and pre-reducing of the materials for saving the energy considerably as contrasted to conventional methods.
Abstract:
In a method and apparatus for manufacturing reducing gas by utilizing a slag-tap type furnace wherein a solid carbonaceous substance such as coal and coke is charged into the furnace through the top thereof, steam and oxygen or oxygen-rich air are blown into the furnace through a tuyere at the hearth, the gas produced is discharged from the furnace top and the ash components of the ash substance are discharged from the furnace bottom as a molten slag, a liquefied high calorie substance such as heavy oil, asphalt and plastics is blown into a region of the furnace in which the solid carbonaceous substance is heated to a temperature of from 600.degree. to 1200.degree. C. thus increasing the heat quantity of the gas produced. The efficiency of the furnace can be improved by separating low temperature volatile substances from the gas produced and admitting the separated low temperature volatile substances into the furnace together with steam and oxygen or oxygen-rich air.