Abstract:
A device for measuring displacement of ceramic materials while they are hot, wherein a laser emitting unit of a laser displacement measuring instrument is disposed on one side of a core tube that is arranged to penetrate through a sample heating furnace, a laser receiving unit is disposed on the opposing side, slit metals for blocking intra-furnace radiant heat and light are provided on the inside of the measuring windows provided at both ends of the core tube, heat insulating materials with slits for blocking intra-furnace radiant heat and light are arranged on the inside thereof, slit plates for blocking intra-furnace radiant light and optical filters for decreasing intra-furnace radiant light are arranged at the end surfaces of the laser emitting unit and the laser receiving unit, in order to eliminate measuring error caused by the light and heat in the furnace, and making it possible to take measurement maintaining a resolution of smaller than 0.5 νm (the interior of the core tube of the sample heating furnace can, as required, be substituted by various kinds of atmospheres, and displacement of small samples such as ceramics can be measured).
Abstract:
This invention relates to an apparatus for controlling a flow rate of a molten metal, capable of being set at a bottom or side portion of a molten metal container and consisting of a rotary nozzle of various shapes, a nozzle receiving brick and a sleeve, or a rotary nozzle, and a nozzle receiving brick. At least one of the nozzle receiving brick and sleeve is provided with at least one recess or opening, and the surface of the opened end portion of the rotary nozzle, which has at least one through bore, is in close contact with and supported on the inner circumferential surface of the nozzle receiving brick or sleeve so that the nozzle can be turned, a rotary mechanism being provided to the rotary nozzle.
Abstract:
Alpha-sialon-containing ceramics having the following composition (presented as nitrides or oxides): Si3N4: 82.0-97.4 wt %, A$(1,3)$N: 1.6-12.5 wt %, Y2O3: 1.0-7.5 wt %, MgO: x wt %, CaO: Y wt %, Li2O: z wt % (where 0
Abstract:
A gunning refractory composition which can retain high exfoliation resistance, adhesive strength and corrosion resistance even in a high-temperature steelmaking operation. The composition comprises a refractory material, 2-10 wt.% of either a resol phenol resin powder exhibiting a semi-molten state in the temperature range of 80 to 500 DEG C, having a weight-average molecular weight of 1,000 to 15,000 and containing at most 1,000 ppm of residual monomers or a phenol-formaldehyde resin powder exhibiting a molten self-cured state in the temperature range of 100 to 500 DEG C, having a weight-average molecular weight of 1,000 to 15,000 and containing at most 1,000 ppm of residual monomers and 6-9 wt.% of reactive methylol groups, and 2-10 wt.% of a pitch having a softening point of as high as 100 to 500 DEG C.
Abstract:
High-strength ceramics containing alpha-sialon substantially comprising an alpha-sialon composition represented by the formula: Yx(Si, Al)12(O, N)16, where 0
Abstract:
Improvements in a powder feeding apparatus for continuous casting comprising a powder feeder (7) and a screw conveyor (11) carried by a truck (8) disposed in the vicinity of a casting mould, a guide rod (16) mounted on the screw conveyor (11), said guide rod being operatively associated with an arcuate guide (15) at the posterior portion of the screw conveyor (11), a crank mechanism (13) connected to the screw conveyor (11), a nozzle port (18) loosely fitted on the forward end of the screw conveyor (11) via the guide rod (16), and motors (12), (14) connected to the screw conveyor (11) and crank mechanism (13), respectively. This arrangement thus provides a powder feeding apparatus for continuous casting, wherein the nozzle port (18) can be adjustably reciprocated along the direction of the mold width. The optimum amount of powder can therefore be continuously charged uniformly spread over a molten steel surface during continuous casting.