The present invention relates to a 3D printer printhead, a 3D printer using the same, a method for manufacturing a molded product by using the 3D printer, a method for manufacturing an artificial tooth by using the 3D printer, and a method for manufacturing a machinable glass ceramic molded product by using the 3D printer, the 3D printer printhead comprising: an inlet through which glass wire, which is a raw material, is introduced; a heating means for heating the glass wire introduced through the inlet; a melting furnace for providing a space in which the glass wire is fused; and a nozzle connected to the lower part of the melting furnace so as to temporarily store the fused glass or discharge a targeted amount of the fused glass, wherein the melting furnace includes an exterior frame made from a heat resistant material and an interior frame having a crucible shape, and the interior frame is made from platinum (Pt), a Pt alloy or graphite, which have a low contact angle, or a material having a surface coated with Pt or a diamond-like carbon (DLC) so as to prevent the fused glass from sticking thereto. According to the present invention, the molded product, the artificial tooth, and the machinable glass ceramic molded product can be manufactured with excellent mechanical properties, thermal durability, chemical durability and oxidation resistance and outstanding texture by using the glass wire as a raw material.

The present invention provides a high alumina fused cast refractory that is easily produced and has low porosity and high corrosion resistance, and a method of producing the same. The high alumina fused cast refractory of the present invention has the following chemical composition: 95.0 mass % to 99.5 mass % Al.sub.2O.sub.3, 0.20 mass % to 1.50 mass % SiO.sub.2, 0.05 mass % to 1.50 mass % B.sub.2O.sub.3, 0.05 mass % to 1.20 mass % MgO and balance. The method of producing the high alumina fused cast refractory of the present invention includes obtaining a mixture by mixing an Al.sub.2O.sub.3 source material, a SiO.sub.2 source material, a B.sub.2O.sub.3 source material and an MgO source material, and fusing the mixture.

Provided is a manufacturing method for a glass article, including a melting step of generating molten glass (Gm) in a melting furnace (1), the melting furnace (1) being configured to heat the molten glass (Gm) through application of a current with an electrode (11) mounted to a bottom wall part (10).

Provided is a manufacturing method for a glass article, including a melting step of generating molten glass (Gm) in a melting furnace (1), the melting furnace (1) being configured to heat the molten glass (Gm) through application of a current with an electrode (11) mounted to a bottom wall part (10).

Oven (1), of the type comprising a receptacle (2) of refractory material, which comprises two concave pieces (3, 4) that are joined by the edges (5) thereof with the participation of a refractory binder (6), the pieces (3, 4) comprising a recess (7) in the edge thereof to form the entrance to the oven, and mutually coupling tongue-and-groove joints (50).

A furnace panel for a melting furnace and a method for fabricating the furnace panel are disclosed. In particular, the furnace panel can include at least one outer wall having an inner surface; and a cast sacrificial layer carried by the inner surface of the at least one outer wall and composed of a mixture of cullet and a binder solution.

A furnace panel for a melting furnace and a method for fabricating the furnace panel are disclosed. In particular, the furnace panel can include at least one outer wall having an inner surface; and a cast sacrificial layer carried by the inner surface of the at least one outer wall and composed of a mixture of cullet and a binder solution.

An industrial furnace for melting materials is provided. The industrial furnace includes metal components, a refractory shell, and a fill. The refractory shell is positioned to cover an inner surface of the metal components such that one or more pockets are defined between the metal components and the refractory shell. The refractory shell has an inner surface that substantially defines a melting bath in which the materials are deposited for melting. The fill is disposed in each of the pockets. 90% to 99.5% of the fill is composed of one or more magnesia materials selected from the group consisting of dead-burned magnesia and fused magnesia.

In embodiments, a melter for melting glass may include an inlet wall, an outlet wall opposite the inlet wall, and sidewalls extending from the inlet wall to the outlet wall. The inlet wall, outlet wall, and sidewalls define a glass melting space enclosed by a floor and a top. In embodiments, the inlet wall may comprise a glass contact wall comprising a glass contact surface facing the glass melting space. A superstructure of the inlet wall comprises a jack arch positioned over the glass contact wall and at least a portion of the glass melting space. A plane of an interior face of the jack arch and a plane of the glass contact surface are off-set in a horizontal direction. A vertical distance from the floor to an underside of the jack arch is less than a vertical distance from the floor to an underside of the top.

To form, on a ceramic member or a metal member, a thermal spray ceramic coating film which achieves both the quality of a ceramic coating film and gas barrier property, and with which a composite oxide having a melting point lower than the ambient temperature will not form when used as a coating film on a ceramic member or a metal member constituting a glass article manufacturing apparatus. A ceramic coating film-provided member comprising a ceramic member or a metal member and a thermal spray ceramic coating film formed on at least a part of the surface of the ceramic member or the metal member, wherein the thermal spray ceramic coating film contains Al.sub.2O.sub.3 and 12CaO.7Al.sub.2O.sub.3, and the weight ratio of CaO to Al.sub.2O.sub.3 (CaO/Al.sub.2O.sub.3) is more than 0.11 to 0.50.