Abstract: A ceramic matrix composite includes, as a matrix, boron carbide, silicon carbide, and metal silicon or a silicon alloy. The boron carbide is contained as a main component of the matrix.

Abstract: The pipe structure according to the present invention includes: a fiber-reinforced plastic pipe 5; moisture-proof foils 11, 12 which individually cover an outer circumferential surface of the pipe 5 and an inner circumferential surface thereof; and an intermediate part 4 which is made of metal and fitted to an end of the pipe 5, wherein end portions of the moisture-proof foils 11, 12 are tightly sandwiched between the pipe 5 and the intermediate part 4. This configuration reliably prevents an FRP pipe from absorbing moisture, and thus, prevents the FRP pipe from shrinking due to moisture exhaustion in outer space, whereby it is possible to obtain the pipe structure having excellent dimensional stability.

Abstract: A honeycomb core includes carbon fiber having four or more different fiber directions, and when a ribbon direction is set as an X axis direction, a cell width direction is set as a Y axis direction, and a direction that is orthogonal to the ribbon direction and the cell width direction is set as a Z axis direction. A condition in which angles formed by the X axis direction and the respective fiber directions of the carbon fiber are set at ?45 degrees, 0 degrees, 45 degrees, and 90 degrees is set as a reference condition. The respective fiber directions are rotated from the reference condition by a fixed rotation angle so that none of the fiber directions are parallel to the X axis direction.

Abstract: A honeycomb core includes carbon fiber having four or more different fiber directions, and when a ribbon direction is set as an X axis direction, a cell width direction is set as a Y axis direction, and a direction that is orthogonal to the ribbon direction and the cell width direction is set as a Z axis direction. A condition in which angles formed by the X axis direction and the respective fiber directions of the carbon fiber are set at ?45 degrees, 0 degrees, 45 degrees, and 90 degrees is set as a reference condition. The respective fiber directions are rotated from the reference condition by a fixed rotation angle so that none of the fiber directions are parallel to the X axis direction.

Abstract: A cover for an air conditioning device for a railway vehicle is a cover for an air conditioning device for a vehicle, which covers an air-conditioner main body. The cover includes a core made of a foamed material having heat insulating property, and a surface member made of a fiber reinforced plastic, which covers entire surfaces of the core. The core is deformed into a curved shape by elastic deformation.

Abstract: A flight vehicle radome according to the present invention has a shape that covers radio equipment installed in a flight vehicle. The flight vehicle radome is formed of a sandwich panel structure in which a core member (30) resulting from foaming and compositing of a heat-resistant resin (32) and insulating reinforcing fibers (31) is sandwiched between skin members (20) made of a fiber reinforced material being a composite of quartz cloth (20) and a heat-resistant resin (22).

Abstract: Provided is an advanced grid structure manufactured by a lamination step of laminating a first tape prepreg group, a second tape prepreg group, and a third tape prepreg group repeatedly in the stated order on a forming die, in which grooves (2, 3, 4) in a lattice shape are formed in three directions, so as to provide crossing regions (7, 8, 9) in which two tape prepreg groups overlap each other, and a heating forming step of forming a laminate by heating under pressure. In the lamination step, the first tape prepreg group, the second tape prepreg group, and the third tape prepreg group are respectively laminated as one layer in crossing regions (7, 8, 9) so that a tape width is maintained, and laminated in non-crossing regions (2a, 3a, 4a) in a state of being folded as two layers in a width direction thereof.

Abstract: Provided is an advanced grid structure manufactured by a lamination step of laminating a first tape prepreg group, a second tape prepreg group, and a third tape prepreg group repeatedly in the stated order on a forming die, in which grooves (2, 3, 4) in a lattice shape are formed in three directions, so as to provide crossing regions (7, 8, 9) in which two tape prepreg groups overlap each other, and a heating forming step of forming a laminate by heating under pressure. In the lamination step, the first tape prepreg group, the second tape prepreg group, and the third tape prepreg group are respectively laminated as one layer in crossing regions (7, 8, 9) so that a tape width is maintained, and laminated in non-crossing regions (2a, 3a, 4a) in a state of being folded as two layers in a width direction thereof.

Abstract: A cover for an air conditioning device for a railway vehicle is a cover for an air conditioning device for a vehicle, which covers an air-conditioner main body. The cover includes a core made of a foamed material having heat insulating property, and a surface member made of a fiber reinforced plastic, which covers entire surfaces of the core. The core is deformed into a curved shape by elastic deformation.

Abstract: Provided is an advanced grid structure manufactured by a lamination step of laminating a first tape prepreg group, a second tape prepreg group, and a third tape prepreg group repeatedly in the stated order on a forming die, in which grooves in a lattice shape are formed in three directions, so as to provide crossing regions in which two tape prepreg groups overlap each other, and a heating forming step of forming a laminate by heating under pressure. In the lamination step, the first tape prepreg group, the second tape prepreg group, and the third tape prepreg group are respectively laminated as one layer in crossing regions so that a tape width is maintained, and laminated in non-crossing regions in a state of being folded as two layers in a width direction thereof.

Abstract: Provided is an advanced grid structure manufactured by a lamination step of laminating a first tape prepreg group, a second tape prepreg group, and a third tape prepreg group repeatedly in the stated order on a forming die, in which grooves (2, 3, 4) in a lattice shape are formed in three directions, so as to provide crossing regions (7, 8, 9) in which two tape prepreg groups overlap each other, and a heating forming step of forming a laminate by heating under pressure. In the lamination step, the first tape prepreg group, the second tape prepreg group, and the third tape prepreg group are respectively laminated as one layer in crossing regions (7, 8, 9) so that a tape width is maintained, and laminated in non-crossing regions (2a, 3a, 4a) in a state of being folded as two layers in a width direction thereof.

Abstract: An optical mirror comprising: a mirror body having a reflective surface; a waffle structure that is connected to a surface opposite to the reflective surface of the mirror body, the waffle structure comprising partition walls, wherein at least one of the partition walls includes a heat generation part; and a power supply part configured to supply power to the heat generation part, wherein the partition walls and the mirror body are made of a same material.

Abstract: Provided is an advanced grid structure manufactured by a lamination step of laminating a first tape prepreg group, a second tape prepreg group, and a third tape prepreg group repeatedly in the stated order on a forming die, in which grooves (2, 3, 4) in a lattice shape are formed in three directions, so as to provide crossing regions (7, 8, 9) in which two tape prepreg groups overlap each other, and a heating forming step of forming a laminate by heating under pressure. In the lamination step, the first tape prepreg group, the second tape prepreg group, and the third tape prepreg group are respectively laminated as one layer in crossing regions (7, 8, 9) so that a tape width is maintained, and laminated in non-crossing regions (2a, 3a, 4a) in a state of being folded as two layers in a width direction thereof.

Abstract: An advanced grid structure has high strength and low thermal expansion, and includes first, second, and third tape prepreg groups each including a plurality of tape prepregs. Each tape prepreg includes carbon fibers that are aligned in a first, second, or third direction and that form respective first, second, and third grid sides. A plurality of each the first, second, and third grid sides are spaced apart at equal intervals in the respective first, second, or third direction to form respective first, second, and third grid side groups. A structure ratio of the advanced grid structure is larger than 0 and 0.107 or less, 0.053 or less, or 0.040 or less. A thermal expansion coefficient of the advanced grid structure is ?0.9 ppm/K or more and 0.9 ppm/K or less. The carbon fibers have a tensile modulus of elasticity of 280 GPa or more and 330 GPa or less.

Abstract: An optical mirror comprising: a mirror body having a reflective surface; a waffle structure that is connected to a surface opposite to the reflective surface of the mirror body, the waffle structure comprising partition walls, wherein at least one of the partition walls includes a heat generation part; and a power supply part configured to supply power to the heat generation part, wherein the partition walls and the mirror body are made of a same material.

Abstract: Provided is an advanced grid structure having high strength and low thermal expansion characteristics. The advanced grid structure includes: a first grid side group extending in the same direction as a first tape prepreg group and constituting a side of a grid group; a second grid side group extending in the same direction as a second tape prepreg group and constituting a side of the grid group; and a third grid side group extending in the same direction as a third tape prepreg group and constituting a side of the grid group, in which: a structure ratio of the advanced grid structure is larger than 0 and 0.