Abstract: Provided is a porous material which is not easily damaged even when being exposed to a high temperature in a low oxygen atmosphere, and has heat resistance improved. A porous material includes aggregates formed of a nonoxide containing silicon and a binding material formed of an oxide ceramic binding the aggregates to each other while keeping a plurality of pores. The porous material has a phase containing oxygen on a surface of the aggregates including a boundary surface with the binding material. In the porous material, a content ratio of oxygen in the aggregates is preferably from 2 to 25% by mass relative to the mass of the aggregates.

Abstract: Provided is a porous material which is not easily damaged even when being exposed to a high temperature in a low oxygen atmosphere, and has heat resistance improved. A porous material includes aggregates formed of a nonoxide containing silicon and a binding material formed of an oxide ceramic binding the aggregates to each other while keeping a plurality of pores. The porous material has a phase containing oxygen on a surface of the aggregates including a boundary surface with the binding material. In the porous material, a content ratio of oxygen in the aggregates is preferably from 2 to 25% by mass relative to the mass of the aggregates.

Abstract: The present invention is steel for surface hardening for machine structural use which contains, by mass %, C: 0.3 to 0.6%, Si: 0.02 to 2.0%, Mn: 0.35 to less than 1.5%, and Al: 0.01 to 0.5%, is restricted to B: less than 0.0003%, S: 0.0001 to 0.021%, N: 0.003 to 0.0055%, P: 0.0001 to 0.03%, and O: 0.0001 to 0.0050%, has a ratio Mn/S of Mn and S satisfying 70 to 30,000, has a balance of Fe and unavoidable impurities, and, when nitrided, then induction hardened, has a surface hardenability of a Vicker's hardness when tempered at 300° C. of 650 or more.

Abstract: A honeycomb structure includes a honeycomb structure body having a partition wall which is constituted of a porous body. The porous body includes a refractory aggregate and a bonding material. The porous body constituting includes the bonding material at a mass proportion of 20 to 35 mass %. In an observation of a cross section of the partition wall with an electron microscope, when observing any given ten visual fields meeting a following condition (1), the number of refractory aggregates meeting a following condition (2) is five pieces or more in all of the ten visual fields. Condition (1): a proportion of an area occupied by the bonding material is 30% or more. Condition (2): the refractory aggregate has a particle diameter of 5 ?m or more, and 60% or more of an outer circumference of the refractory aggregate is surrounded by the bonding material.

Abstract: Steel for machine structure use excellent in tool lifetime in a broad range of cutting speeds regardless of continuous machining, intermittent machining, or other systems and further in various machining environments such as use of a cutting fluid or a dry, semidry, and oxygen enriched environment, having a chemical composition containing, by mass %, C: 0.01 to 1.2%, Si: 0.005 to 3.0%, Mn: 0.05 to 3.0%, P: 0.0001 to 0.2%, S: 0.0001 to 0.35%, N: 0.0005 to 0.035%, and Al: 0.05 to 1.0%, satisfying [Al %]?(27/14)×[N %]?0.05%, and having a balance of Fe and unavoidable impurities and forming an Al2O3 coating on the surface of a cutting tool by machining using a cutting tool coated on the surface contacting the machined material by metal oxides with a value of a standard free energy of formation at 1300° C. of that value of Al2O3 or more, and a machining method of the same.

Abstract: A fuel cell (3) includes interconnectors (hereinafter, IC) (12, 13), a cell body (20) disposed between the ICs and including an air electrode (14) and a fuel electrode (15) on both surfaces of an electrolyte (2), and current collecting members (18, 19) disposed between at least one of the electrodes (14, 15) and the ICs. The current collecting members (19) include connector contact portions (19a) in contact with the IC (13), cell body contact portions (19b) in contact with the cell body (20), and connecting portions (19c) that are bent approximately 180 degrees and connect both the contact portions. The connector contact portions include asperities (19e) on outside surfaces of the connector contact portions on the side where the connector contact portions are in contact with the IC 13, and a spacer (58) is disposed between the connector contact portions and the cell body contact portions.

Abstract: A fuel cell (3) includes interconnectors (hereinafter, IC) (12, 13), a cell body (20) disposed between the ICs and including an air electrode (14) and a fuel electrode (15) on both surfaces of an electrolyte (2), and current collecting members (18, 19) disposed between at least one of the electrodes (14, 15) and the ICs. The current collecting members (19) include connector contact portions (19a) in contact with the IC (13), cell body contact portions (19b) in contact with the cell body, and connecting portions (19c) that are bent approximately 180 degrees and connect both the contact portions, the connector contact portions, the cell body contact portions, and the connecting portions being formed in line. The current collecting members (19) include asperities (19e) on inside surfaces oriented inward, and a spacer (58) is disposed between the connector contact portions and the cell body contact portions.

Abstract: There is disclosed a porous material. The porous material contains aggregates, and a bonding material which bonds the aggregates to one another in a state where pores are formed among the aggregates, the bonding material contains crystalline cordierite, the bonding material further contains a rare earth element or a zirconium element, and a ratio of a mass of the bonding material to a total mass of the aggregates and the bonding material is from 12 to 45 mass %. The bonding material preferably contains, in the whole bonding material, 8.0 to 15.0 mass % of MgO, 30.0 to 60.0 mass % of Al2O3, 30.0 to 55.0 mass % of SiO2, and 1.5 to 10.0 mass % of a rare earth oxide or zirconium oxide.

Abstract: A honeycomb filter includes a honeycomb structure and plugged portions. Partition walls of the honeycomb structure are made of a partition wall material including a plurality of aggregates containing silicon carbide or silicon nitride as a main component, and a binding material at a content of 15 to 35 mass %. The binding material is made of a material in which mullite particles as reinforcing particles may be dispersed in cordierite. A thermal expansion coefficient of the partition walls at 40 to 800° C. is 4.2×10?6 1/K or less. When a value of a stress applied to the partition wall material at 900° C. is normalized by the maximum value of the stress applied to the partition wall material, a percentage of a plastic deformation displacement in a total displacement at a normalized stress value of 0.9 is in a range of 0.3 to 10%.

Abstract: Steel for machine structure use for surface hardening containing, by mass %, C: 0.3 to 0.6%, Si: 0.02 to 2.0%, Mn: 1.5% to 3.0%, W: 0.0025 to 0.5%, Al: 0.001 to 0.5%, N: 0.003 to 0.02%, S: 0.0001 to 0.025%, P: 0.0001 to 0.03%, and O: 0.0001 to 0.0050%, having an Mn/S of 70 to 30000, and having a balance of substantially Fe and unavoidable impurities.

Abstract: A honeycomb structure includes a honeycomb structure body having a partition wall which is constituted of a porous body. The porous body includes a refractory aggregate and a bonding material. The porous body constituting includes the bonding material at a mass proportion of 20 to 35 mass %. In an observation of a cross section of the partition wall with an electron microscope, when observing any given ten visual fields meeting a following condition (1), the number of refractory aggregates meeting a following condition (2) is five pieces or more in all of the ten visual fields. Condition (1): a proportion of an area occupied by the bonding material is 30% or more. Condition (2): the refractory aggregate has a particle diameter of 5 ?m or more, and 60% or more of an outer circumference of the refractory aggregate is surrounded by the bonding material.

Abstract: Provided is a hot-working steel excellent in machinability and impact value comprising, in mass %, C: 0.06 to 0.85%, Si: 0.01 to 1.5%, Mn: 0.05 to 2.0%, P: 0.005 to 0.2%, S: 0.001 to 0.35%, and Al: 0.06 to 1.0% and N: 0.016% or less, in contents satisfying Al×N×105?96, and a balance of Fe and unavoidable impurities, total volume of AlN precipitates of a circle-equivalent diameter exceeding 200 nm accounting for 20% or less of total volume of all AlN precipitates.

Abstract: A fuel cell (3) includes interconnectors (hereinafter, IC) (12, 13), a cell body (20) disposed between the ICs and including an air electrode (14) and a fuel electrode (15) on both surfaces of an electrolyte (2), and current collecting members (18, 19) disposed between at least one of the electrodes (14, 15) and the ICs. The current collecting members (19) include connector contact portions (19a) in contact with the IC (13), cell body contact portions (19b) in contact with the cell body (20), and connecting portions (19c) that are bent approximately 180 degrees and connect both the contact portions. The connector contact portions include asperities (19e) on outside surfaces of the connector contact portions on the side where the connector contact portions are in contact with the IC 13, and a spacer (58) is disposed between the connector contact portions and the cell body contact portions.

Abstract: A fuel cell (3) includes interconnectors (hereinafter, IC) (12, 13), a cell body (20) disposed between the ICs and including an air electrode (14) and a fuel electrode (15) on both surfaces of an electrolyte (2), and current collecting members (18, 19) disposed between at least one of the electrodes (14, 15) and the ICs. The current collecting members (19) include connector contact portions (19a) in contact with the IC (13), cell body contact portions (19b) in contact with the cell body, and connecting portions (19c) that are bent approximately 180 degrees and connect both the contact portions, the connector contact portions, the cell body contact portions, and the connecting portions being formed in line. The current collecting members (19) include asperities (19e) on inside surfaces oriented inward, and a spacer (58) is disposed between the connector contact portions and the cell body contact portions.

Abstract: There is disclosed a porous material. The porous material contains aggregates, and a bonding material which bonds the aggregates to one another in a state where pores are formed among the aggregates, the bonding material contains crystalline cordierite, the bonding material further contains a rare earth element or a zirconium element, and a ratio of a mass of the bonding material to a total mass of the aggregates and the bonding material is from 12 to 45 mass %. The bonding material preferably contains, in the whole bonding material, 8.0 to 15.0 mass % of MgO, 30.0 to 60.0 mass % of Al2O3, 30.0 to 55.0 mass % of SiO2, and 1.5 to 10.0 mass % of a rare earth oxide or zirconium oxide.

Abstract: The present invention is steel for surface hardening for machine structural use which contains, by mass %, C: 0.3 to 0.6%, Si: 0.02 to 2.0%, Mn: 0.35 to less than 1.5%, and Al: 0.01 to 0.5%, is restricted to B: less than 0.0003%, S: 0.0001 to 0.021%, N: 0.003 to 0.0055%, P: 0.0001 to 0.03%, and 0:0.0001 to 0.0050%, has a ratio Mn/S of Mn and S satisfying 70 to 30,000, has a balance of Fe and unavoidable impurities, and, when nitrided, then induction hardened, has a surface hardenability of a Vicker's hardness when tempered at 300° C. of 650 or more.

Abstract: The present invention is steel for surface hardening for machine structural use which contains, by mass %, C: 0.3 to 0.6%, Si: 0.02 to 2.0%, Mn: 0.35 to less than 1.5%, and Al: 0.01 to 0.5%, is restricted to B: less than 0.0003%, S: 0.0001 to 0.021%, N: 0.003 to 0.0055%, P: 0.0001 to 0.03%, and O: 0.0001 to 0.0050%, has a ratio Mn/S of Mn and S satisfying 70 to 30,000, has a balance of Fe and unavoidable impurities, and, when nitrided, then induction hardened, has a surface hardenability of a Vicker's hardness when tempered at 300° C. of 650 or more.

Abstract: A honeycomb filter includes a honeycomb structure and plugged portions. Partition walls of the honeycomb structure are made of a partition wall material including a plurality of aggregates containing silicon carbide or silicon nitride as a main component, and a binding material at a content of 15 to 35 mass %. The binding material is made of a material in which mullite particles as reinforcing particles may be dispersed in cordierite. A thermal expansion coefficient of the partition walls at 40 to 800° C. is 4.2×10?6 1/K or less. When a value of a stress applied to the partition wall material at 900° C. is normalized by the maximum value of the stress applied to the partition wall material, a percentage of a plastic deformation displacement in a total displacement at a normalized stress value of 0.9 is in a range of 0.3 to 10%.

Abstract: Steel for machine structure use for surface hardening containing, by mass %, C: 0.3 to 0.6%, Si: 0.02 to 2.0%, Mn: 1.5% to 3.0%, W: 0.0025 to 0.5%, Al: 0.001 to 0.5%, N: 0.003 to 0.02%, S: 0.0001 to 0.025%, P: 0.0001 to 0.03%, and O: 0.0001 to 0.0050%, having an Mn/S of 70 to 30000, and having a balance of substantially Fe and unavoidable impurities.

Abstract: The present invention provides a gear, continuously variable transmission, constant velocity joint, hub, or other steel part superior in surface fatigue strength compared with the past and method of production of the same, that is, provides a carbonitrided induction hardened steel part made of steel comprised of a specific composition of chemical ingredients and carbonitrided, then treated by induction hardening, the steel part characterized in that a surface N concentration is 0.1 to 0.8 mass %, a sum of an N concentration and C concentration is 1.0 to 2.0 mass %, an amount of surface residual austenite is less than 15 vol %, a depth of the incompletely hardened layer from the surface is less than 5 ?m, and a surface X-ray diffraction half width is 6.0 degrees or more, and a method of production of the same.