The subject matter of the invention is mold material mixtures for producing molds or cores for metal casting, consisting of at least one refractory base mold material, a binder and an additive based on factice. The invention also relates to a component system, a method for producing molds and cores using the mold material mixtures or the component system respectively, and to molds and cores produced by said method.

This invention relates to three-dimensional printing. This invention in particular relates to a method of generating mold and printing a three-dimensional object. The mold thickness is controlled and holes are generated in the mold surface for releasing moisture easily. The mold surface having holes is designed initially digitally and then combined with the three-dimensional model before printing the three-dimensional object. In case the thickness of the mold surface is more then it reduces the overall quality of the three-dimensional object. When the model is enclosed inside the mold, there will be some residue moisture in the model even if the drying apparatus can improve this by drying layer by layer. This affects the final quality of the part. A solution of these problems is provided in the present invention. The thickness of the mold layer is between 0.5 to 1 mm and holes having 0.1 to 0.4 mm diameter. The holes are evenly distributed on the mold. The mold having the holes is prepared from which moisture can easily escape. A method of digitally generated a mold having thin layer and holes is used for fabricating three dimensional objects with high precision and quality.

This invention relates to three-dimensional printing. This invention particularly relates to a system with a dynamic variable size nozzle orifice for three-dimensional printing of objects based on crafting and molding techniques, and a method thereof. The present invention provides a dynamic variable nozzle orifice, where one embodiment uses a nozzle made of a soft flexible material. The soft flexible material, such as rubber, latex or silicone, is such that when the extrusion pressure is high the orifice will enlarge and allow wider extrusion volume for filling large or wide voids. In another scenario, when the extrusion pressure is lower the orifice will be narrower and give precise narrow extrusion to fill smaller voids. Another embodiment uses a method of controlling the orifice size which is by a mechanical means independent of the pressure in the nozzle. Such a method can utilize an iris device for controlling the size of the orifice. By utilizing the function of a dynamic orifice size of the nozzle when depositing a crafting material inside a mold structure as described herein, the printing time can be reduced without a reduction in detailing abilities. Subsequently, the systems and methods of the present invention are useful for fabricating high-quality three-dimensional objects using a crafting paste and molding techniques.

Provided are a nanofiber-nanowire composite and a method for producing the same. The method includes preparing a nanoparticle using a dipolar solvent, producing a nanofiber-nanoparticle composite in an electrospinning synthesis solution including the nanoparticle through electrospinning, and growing a nanowire from the nanoparticle by hydrothermally synthesizing a dried nanofiber-nanoparticle composite.

A radon-free ceramic panel includes a mixture including two or more types of stone dust selected from among granite, basalt, limestone, dolomite, elvan, black stone, feldspar, and sandstone, along with waste slag and a non-phenolic adhesive. The ceramic panel is lightweight and has excellent fire resistance, heat insulation, corrosion resistance, water resistance, and ability to act as a bather to radon gas.

Provided is a powder material for producing a three-dimensional object including: a base material; a resin; and resin particles, wherein an amount W (mass %) of carbon remaining in the powder material after heating in a vacuum of 10.sup.2 Pa or lower at 450 degrees C. for 2 hours satisfies the following formula: W (mass %)<0.9/M, where M represents the specific gravity of the base material.

A ceramic-metal temporary bonding body to inhibit breakage and degradation of a ceramic resin composite having low strength includes: a ceramic resin composite in which a non-oxide ceramic sintered body is impregnated with a thermosetting resin composition having cyanate groups in such a manner that a degree of cure calculated by differential scanning calorimetry is 5.0% or more and 70% or less; and a metal plate temporarily bonded to at least one surface of the ceramic resin composite. A shear bond strength between the ceramic resin composite and the metal plate is 0.1 MPa or more and 1.0 MPa or less.

A ceramic molded body including a ceramic powder and an organic binder includes an oxidizable ceramic powder as the ceramic powder, includes an oxidizable metal or metal compound, or is in contact with a solid body including an oxidizable metal or metal compound. In a hydrogen atmosphere, the ceramic molded body is heated to a maximum temperature set within a range of 1,100 C. to 1,400 C. at a heating rate of more than 25 C./h, is degreased at the maximum temperature, and is then cooled at a cooling rate of more than 25 C./h.

A method for producing SiC/SiC composite material according to the present invention includes impregnating a substrate with a slurry containing particles of a flaky lubricant to obtain an impregnated body, drying out a solvent of the slurry from the impregnated body, forming an interface layer on surfaces of the SiC fibers by bending the impregnated body, and transferring the particles of the flaky lubricant to the surfaces of the SiC fibers while stretching the particles, and forming a SiC matrix inside the substrate on which the interface layer is formed. Since a thin interface layer of the flaky lubricant can be formed on the surfaces of the SiC fibers by transferring the flaky lubricant to the surfaces of the SiC fibers, the interface layer reaching inside of the substrate can be easily formed.

The present invention relates to a filament suitable to be used in a 3D printing device, wherein the filament comprises a metal and/or ceramic powder, a thermoplastic binder and additives. The invention also relates to a process for producing a shaped body comprising the step of printing a shaped green body using the filament according to the invention. Also provided is the use of a filament according to the invention in a 3D printing device and a green body producible by mixing a metal and/or ceramic powder and a thermoplastic binder. The invention also relates to the use of a binder of the invention for the production of a filament for 3D printing devices.