Abstract: An object of the present invention is to provide a Li2O—Al2O3—SiO2 based crystallized glass with excellent bubble quality even without using As2O3 or Sb2O3 as a fining agent and a method for producing the same. The Li2O—Al2O3—SiO2 based crystallized glass of the present invention is a Li2O—Al2O3—SiO2 based crystallized glass which does not substantially comprise As2O3 and Sb2O3 and comprises at least one of Cl, CeO2 and SnO2, and has a S content of not more than 10 ppm in terms of SO3.

Abstract: A glass manufacturing container includes a container body and an electron donor. The container body is made of a precious metal or an alloy containing a precious metal and has an inner surface to be brought into contact with molten glass and an outer surface kept from contact with molten glass. The electron donor is electrically connected to the outer surface of the container body. The electron donor is made of an electron donating material capable of donating electrons to the container body at operating temperatures.

Abstract: To provide crystallizable glass that is less likely to be devitrified even when formed into shape by a float process, causes no breakage during a forming step and a crystallization step and is capable of precipitating LAS-based crystals as main crystals by subjecting the glass to heat treatment after being formed into shape, and crystallized glass obtained by crystallizing the crystallizable glass. The crystallizable glass of the present invention is characterized by substantially containing neither As2O3 nor Sb2O3 and having a composition of, in percent by mass, 55.0 to 73.0% SiO2, 17.0 to 27.0% Al2O3, 2.0 to 5.0% Li2O, 0 to 1.5% MgO, 0 to 1.5% ZnO, 0 to 1.0% Na2O, 0 to 1.0% K2O, 0 to 3.8% TiO2, 0 to 2.5% ZrO2, 0 to 0.6% SnO2, and 2.3 to 3.8% TiO2+ZrO2.

Abstract: A crystallized glass comprises, in term of mass %, 55 to 73% of SiO2, 17 to 25% of Al2O3, 2 to 5% of Li2O, 4 to 5.5% of TiO2, 0.05 to less than 0.2% of SnO2, and 0.02 to 0.1% of V2O5. The crystallized glass has a ratio V2O5/(SnO2+V2O5) of 0.2 to 0.4 and is substantially free of As2O3 and Sb2O3.

Abstract: To provide crystallizable glass that is less likely to be devitrified even when formed into shape by a float process, causes no breakage during a forming step and a crystallization step and is capable of precipitating LAS-based crystals as main crystals by subjecting the glass to heat treatment after being formed into shape, and crystallized glass obtained by crystallizing the crystallizable glass. The crystallizable glass of the present invention is characterized by substantially containing neither As2O3 nor Sb2O3 and having a composition of, in percent by mass, 55.0 to 73.0% SiO2, 17.0 to 27.0% Al2O3, 2.0 to 5.0% Li2O, 0 to 1.5% MgO, 0 to 1.5% ZnO, 0 to 1.0% Na2O, 0 to 1.0% K2O, 0 to 3.8% TiO2, 0 to 2.5% ZrO2, 0 to 0.6% SnO2, and 2.3 to 3.8% TiO2+ZrO2.

Abstract: A glass manufacturing container includes a container body and an electron donor. The container body is made of a precious metal or an alloy containing a precious metal and has an inner surface to be brought into contact with molten glass and an outer surface kept from contact with molten glass. The electron donor is electrically connected to the outer surface of the container body. The electron donor is made of an electron donating material capable of donating electrons to the container body at operating temperatures.

Abstract: Boron carbide ceramics produced by spark sintering methods have more desirable mechanical properties than conventionally produced carbides. The boron carbide ceramics include amorphous boron, amorphous carbon, and Al2O3 powder as a sintering aid. The boron carbides may also contain a carbon nano fiber in a nearly homogeneously dispersed state. The sintered compact has a relative density of a boron carbide ceramic of approximately not less than 99%. The boron carbide ceramics are prepared preferably by subjecting a mixed powder of the starting raw materials and the carbon nano fiber to simultaneous synthesis and sintering using the spark plasma sintering method.

Abstract: Boron carbide ceramics produced by spark sintering methods have more desirable mechanical properties than conventionally produced carbides. The boron carbide ceramics include amorphous boron, amorphous carbon, and Al2O3 powder as a sintering aid. The boron carbides may also contain a carbon nano fiber in a nearly homogeneously dispersed state. The sintered compact has a relative density of a boron carbide ceramic of approximately not less than 99%.

Abstract: Boron carbide ceramics produced by spark sintering methods have more desirable mechanical properties than conventionally produced carbides. The boron carbide ceramics include amorphous boron, amorphous carbon, and Al2O3 powder as a sintering aid. The boron carbides may also contain a carbon nano fiber in a nearly homogeneously dispersed state. The sintered compact has a relative density of a boron carbide ceramic of approximately not less than 99%. The boron carbide ceramics are prepared preferably by subjecting a mixed powder of the starting raw materials and the carbon nano fiber to simultaneous synthesis and sintering using the spark plasma sintering method.

Abstract: Boron carbide ceramics produced by spark sintering methods have more desirable mechanical properties than conventionally produced carbides. The boron carbide ceramics include amorphous boron, amorphous carbon, and Al2O3 powder as a sintering aid. The boron carbides may also contain a carbon nano fiber in a nearly homogeneously dispersed state. The sintered compact has a relative density of a boron carbide ceramic of approximately not less than 99%. The boron carbide ceramics are prepared preferably by subjecting a mixed powder of the starting raw materials and the carbon nano fiber to simultaneous synthesis and sintering using the spark plasma sintering method.

Abstract: A top plate is provided for use in a cooking device having an induction heater alone or an infrared heater in addition, which comprises a transparent crystallized glass plate, a light-shading film on a bottom surface of the glass plate and an ornamental film formed on the top surface of the glass plate. The light-shading film is a porous layer of inorganic pigment powder dispersed in glass matrix. The light-shading film has small apertures at a portion corresponding to the infrared heater. Alternatively, it has a decreased thickness at the portion. In another alternative, a luster film is used in place of the inorganic pigment layer at the portion corresponding to the infrared heater.

Abstract: A top plate is provided for use in a cooking device having an induction heater alone or an infrared heater in addition, which comprises a transparent crystallized glass plate, a light-shading film on a bottom surface of the glass plate and an ornamental film formed on the top surface of the glass plate. The light-shading film is a porous layer of inorganic pigment powder dispersed in glass matrix. The light-shading film has small apertures at a portion corresponding to the infrared heater. Alternatively, it has a decreased thickness at the portion. In another alternative, a luster film is used in place of the inorganic pigment layer at the portion corresponding to the infrared heater.