摘要:
A silicon member for a semiconductor apparatus is provided. The silicon member has an equivalent performance to one fabricated from a single-crystalline silicon even though it is fabricated from a unidirectionally solidified silicon. In addition, it can be applied for producing a relatively large-sized part. The silicon member is fabricated by sawing a columnar crystal silicon ingot obtained by growing a single-crystal from each of seed crystals by placing the seed crystals that are made of a single-crystalline silicon plate on a bottom part of a crucible and unidirectionally solidifying a molten silicon in the crucible.
摘要:
The present invention concerns a crucible (1) for the production of crystalline semiconducting material ingots, such as silicon, said crucible comprising peripheral side walls (1b) and a floor (1a) at least a portion of said floor being coated with a top layer (2), characterized in that, said top layer (2) has a thickness, δ, of at least 500 μm and in that, at a deformation temperature below 1400 °C said top layer is plastically or viscously deformable.
摘要:
The present invention concerns a crucible (1) for the production of crystalline semiconductor ingots, said crucible comprising an inner volume defined by a floor (1 a) which top surface comprises a planar portion defining a first horizontal plane (H) and peripheral side walls (1b) each comprising an inner surface comprising a planar portion substantially vertical and normal to the first, horizontal plane (H), said side walls (1 b) joining the floor (1 a) at the perimeter of the latter by forming a radius of curvature, R1, of at least 1 mm, characterized in that, the intersecting line (hv) forming the intersection between the first, horizontal plane (H) and the prolongation of the vertical portion of the inner surface of each side wall (1 b) is entirely located on the side walls (1 b), on the floor (1 a), or in the inner volume of the crucible.
摘要:
A crystal growth vessel 2 for growing a crystal within a main container has a crystal growth starting portion 6 in which the crystal starts to grow, whereas the crystal growth starting portion 6 is formed from a material having a thermal conductivity higher than that of a material of the main container 4.
摘要:
A casting mold comprises a free form fabricated ceramic shell which has a thin outer wall defining a cavity adapted for receiving a molten metal. The shell is positioned within a container and spaced from the inner surface of the container. At least one support member substantially fills the space between the outer wall of the shell and the inner surface and reinforcing said shell.
摘要:
A casting mold comprises a free form fabricated ceramic shell which has a thin outer wall defining a cavity adapted for receiving a molten metal. The shell is positioned within a container and spaced from the inner surface of the container. At least one support member substantially fills the space between the outer wall of the shell and the inner surface and reinforcing said shell.
摘要:
A method for fabricating a ceramic casting mold system comprises providing a stereolithography apparatus including a reservoir and an Energy source and providing a data file to the stereolithography apparatus that defines a plurality of cross sections of a casting mold system representative of a gas turbine engine component. A ceramic filled resin comprising ceramic particles, a monomer and an photoinitiator is placed within the reservoir. Using the energy source a cross section of the casting mold system is drawn on a layer of the ceramic filled resin to polymerize the monomer and form a substantially cured layer comprising a polymer binder holding the ceramic particles of the layer together. The substantially cured layer is covered with another layer of the ceramic filled resin. Another cross section of the casting mold system is drawn on the another layer of the ceramic filled resin to polymerize the monomer and form a substantially cured another layer comprising the polymer binder holding the ceramic particles of the another layer together, The process of covering and drawing is repeated for each of the plurality of cross sections to fabricate the casting mold system with a plurality of substantially cured layers.
摘要:
A method of creating an article from investment casting includes forming a ceramic seed well (10), heating the ceramic seed well to form a hardened ceramic seed well (10), attaching a meltable pattern (30) to the hardened ceramic seed well (10), coating the hardened ceramic seed well and the meltable pattern with hardenable ceramic material (42), heating the hardenable ceramic material to melt the meltable pattern (30), removing the meltable pattern from the hardenable ceramic material (42), firing the hardenable ceramic material to form a ceramic mold (64) having a cavity (74), placing a seed (12) within the hardened ceramic seed well, and pouring molten metal (62) into the hardened ceramic seed well (10) and the cavity (74). The cavity of the ceramic mold is in communication with the hardened ceramic seed well (10).
摘要:
Previously a number of techniques have been used in order to form single crystal or pre-determined crystallography components and articles. Each one of these techniques has its own particular problems, including susceptibility to error. By utilisation of a bi-crystal experiment to determine melt-back length LM and by consideration of the ingress distance d from potential initiation nucleation points on a perimeter 46 of a seed crystal 40, it is possible to determine a maximum ingress length d. By ensuring that the maximum ingress length d is less than or equal to a seed crystal diameter R, it is possible to project locus from potential nucleation points C 1 , C 2 in terms of potential radii for stray grain propagation. As the seed crystal 40 will have a known crystalline orientation, it will be possible to consider two divergent growth curves of the crystal 40 in terms of the stray grains propagating from the point C 1 , C 2 . In such circumstances, a connector channel 45 can be provided with a radius r = R / 4 in an area between the periphery 46 of the seed 40 and the locus 43, 44 of the stray grain maximum ingress distances d. In situations where it is found d exceeds the crystal radius R, it will be understood that the actual crystal diameter R used may be increased or adjustment made with regard to the melt-back length LM in order to alter the maximum ingress distance d.