Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Nippon Steel Corporation

Furukawa Aluminum Co., Ltd.

Tadashi Ohya

Kazuo Shibata

Manabu Kubota

Suguru Yoshida

Toshimi Tarui

Hideki Matsuda

Satoshi Yamamura

Atsushi Takai

Koki Mizuno

Tsuyoshi Tanaka

Hidenori Joka

Nagahide Kawasaki

Chiaki Ara

Steel and steel shaped articles with an excellent delayed fracture resistance and a tensile strength of the 1600 MPa class or more, containing, by mass %, C: 0.20 to 0.60%, Si: 0.50% or less, Mn: over 0.10% to 3%, Al: 0.005 to 0.1%, Mo: over 3.0% to 10%, and, as needed, one or more of W: 0.01 to 10%, V: 0.05 to 1%, Ti: 0.01 to 1%, Nb: 0.01 to 1%, Cr: 0.10 to 2%, Ni: 0.05 to 1%, Cu: 0.05 to 0.5%, and B: 0.0003 to 0.01%, and a balance of Fe and unavoidable impurities and, further, a method of production comprising shaping the above steel to a desired shape (for example, a bolt shape), quenching it, then tempering it at 500 to 750&#xb0; C. in temperature range.

Steel with excellent delayed fracture resistance and tensile strength of 1801 MPa class or more, and its shaped article

A process for producing a ceramic molding having a three-dimensional network structure with a plurality of spherical cells and a plurality of through holes present in dividing walls between the spherical cells, includes: a step of obtaining an aggregate of coated particles in which a plurality of ceramic particles are attached to the surface of spherical synthetic resin particles; a step of arranging the aggregate of coated particles in closest packed form within a mold; a step of filling gaps in the aggregate of coated particles with a ceramic so as to give a shaped product; a step of releasing the shaped product from the mold; a step of thermally decomposing the spherical synthetic resin particles of the shaped product so as to form the spherical cells and form the plurality of through holes in dividing wall-forming sections that are present between adjacent spherical cells; and a step of sintering the ceramic particles and the ceramic so as to form the dividing walls.

Process for producing ceramic molding having three-dimensional network structure

The present invention provides a high strength bolt excellent in delayed fracture resistance able to advantageously prevent hydrogen embrittlement as represented by the delayed fracture phenomenon occurring along with an increase in strength and causing a particular problem, and a method of production of the same, containing, by mass %, C: 0.2 to 0.6%, Si: 0.05 to 0.5%, Mn: 0.1 to 2%, Mo: 0.5 to 6%, and Al: 0.005 to 0.5%, having a tensile strength of 1400 MPa or more, and having a compressive residual stress of the surface layer of the thread root of 10 to 90% of the tensile strength. Further, a surface layer part of the thread root from the surface down to at least 50 &#x3bc;m has pre-austenite grains with an aspect ratio of the axial direction and radial direction of 2 or more and that part has a hardness of Hv 460 or more. Further, the method of production comprises using the steel material having the above ingredients to shape the bolt head and shaft, then heat the bolt to 900 to 1100&#xb0; C., quench it, temper it by a 580&#xb0; C. or higher temperature, then thread roll it.

High strength bolt excellent in delayed fracture resistance and method of production of same

The ceramic molded body of the present invention includes spherical cells of a spherical bubble plurally formed therein: in the ceramic molded body the spherical cells neighboring each other are communicated through communication porosities and form a three-dimensional network structure, and a ratio (M/M) of a median (M) of inner diameters of the communication porosities to a median (M) of inner diameters of the spherical cells is less than 0.5. In the ceramic molded body used for manufacturing a metal matrix composite, a metal is filled within the spherical cells and the communication porosities.

Ceramic molded body and metal matrix composite

In a cylinder block, at least one member disposed around a bore is made of a metal matrix composite including a ceramic compact having a three-dimensional mesh structure comprised of a plurality of spherical cells and a plurality of communicating pores for allowing adjacent spherical cells to communicate with each other, with the plurality of spherical cells filled with a metal.

Cylinder block

An Al alloy extrusion material for the fuel-distributing pipe of automobile, consisting essentially of 0.3 to 1.0 wt. % of Si, 0.1 to 0.5 wt. % of Cu, 0.6 to 1.5 wt. % of Mg, 0.3 to 1.0 wt. % of Sn, 0.005 to 0.03 wt. % of Ti and the balance of Al and inevitable impurities and having uniformly dispersed Sn compounds with particle diameter of not more than 20 .mu.m and density of 20 to 700 grains/mm.sup.2 in the section perpendicular to the extrusion direction of material is disclosed, which is excellent in the chip separation property and the precision of cut face on cutting.

Aluminum alloy extrusion material with excellent chip separation

In a combination of sliding members which are suitable for use in the compressor for an automotive air conditioner, one of the members consists of an aluminum alloy which contains silicone particles consisting solely of eutectic silicon; and the other sliding member consists of a fluoride resin which contains carbon fibers and a calcium compound. The surface of the aluminum alloy can be finished to a desired smoothness as it does not contain any excessively hard substance. Also, since a calcium compound which is intermediate between carbon fibers and teflon resin in hardness is distributed in the teflon resin, the tendency of the carbon fibers to attack the aluminum alloy is reduced, and the aluminum alloy can achieve a sufficient wear resistance even though it does not contain any primary crystal silicon particles having a high hardness. Furthermore, the calcium compound serves as a lubricant, and reduces friction between the two sliding members.

Growing community of inventors

Saitama, Japan

Tadashi Ohya