Mazda Motor Corporation

Satoshi Nanba

Seiji Nomura

Kouji Tarumoto

Yukio Yamamoto

Yukihiro Sugimoto

Shinji Kadoshima

Akihide Takami

Takakazu Yamane

Nobuo Sakate

Tsutomu Shimizu

Daiji Katsura

Koji Yagii

Yoshio Tanita

Jun Miyata

Shinya Shibata

A heat-insulating layer exhibiting high resistance to cracks, peeling, deformation, and gasoline and high heat insulation is obtained on the wall surface of an engine member (). First, a heat insulator layer including a silicone-based resin and hollow particles containing a Si-based oxide is formed on a wall surface of the engine member (). Then, Si-based oxide is produced through oxidation of a silicone-based resin in at least part of the surface of the heat insulator layer by heating the surface of the heat insulator layer. Thereafter, a catalytic metal is added to the silicone-based resin in the surface of the heat insulator layer and/or Si-based oxide derived from the hollow particles. Using the catalytic metal as nuclei, electroless plating is performed. In this manner, a heat-insulating layer () in which the surface of the heat-insulating film () is covered with a plating film () is obtained.

Heat-insulating structure of member facing engine combustion chamber, and process for producing same

In forming a plating layer for a sliding portion, which comprises Cr that is electrolytically-deposited in a plating bath containing Cr, the plating bath contains organic sulfonic acid. Accordingly, micro-cracks are formed at the plating layer. The plating layer for a sliding portion has the superior low friction and lubricating property.

Plating layer for sliding portion

When a seat ( ) (FIG. A) on which a wax layer ( ) is formed via a melting reaction layer ( ) is brought into contact with a head ( ) and heated and pressed in this state, a melting reaction layer ( ) forms below the wax layer (FIG. B). When electric current application and pressing are continued from this state, a wax which has not reacted in the wax layer ( ) in the formation of the melting reaction layer ( ) is discharged from between the melting reaction layers ( ) and ( ). When electrical current application and pressing are further continued from this state, the two melting reaction layers ( ) and ( ) diffuse each other. The result is that a ternary alloy bonding layer ( ) containing Fe, Al, and Zn, which constitute the melting reaction layers ( ) and ( ) is formed between the seat ( ) and the head ( ) (FIG. D).

Metal welding method and metal bonding structure

In order to provide a method of joining a cylinder head,and a valve seat,by press and heat generated on passing an electrical current through both members,to achieve satisfactory joining with minimized heat generated inside when the current is supplied, while eliminating the need for an infiltration step and reduce the production cost, inhibiting an increase in thermal conductivity of the valve seat,and improving the wear resistance thereof. The valve seat,is made of a sintered material made from a powdery material with a high electrical conductivity element such as Cu dispersed therein. The current and the pressure are applied with a first joining surface,of the valve seat,and a joining surface,of the cylinder head body,being put into surface contact with each other in advance.

Joined metal member and method of joining said member

The present invention provides a method for joining two metal members into a joined metal member. The method comprise steps of; applying a brazing material having a higher melting point than both the members on the surface of a first metal member and heating them to form a brazing material on said surface and a braze-diffusion layer under the brazing material in the surface area of the first member; and, then, pressing the first and another second metal members between which the brazing material is interposed during heating at a higher temperature than said melting point of the brazing material to squeeze the molten brazing material out between both the contact surfaces of both the metal members, therefor the two metal members being joined by the braze diffusion layers formed in both the surfaces into the joined metal member. Particularly, the first metal member may comprise an iron-based alloy and the second metal members may comprise an aluminum-based alloy, and the brazing material may be zinc-containing material such as Zn&mdash;Al eutectic alloy.

Joined metal member and a method and an apparatus for fabricating the same

There is disclosed a rotor housing for a rotary piston engine which is designed particularly for high output power wherein the rotor housing inner wall surface is required to possess heat and wear resistant properties, improved affinity to lubricant oil, resistance to uneven wear which may cause chatter marks and scratches, oil retaining property, and less harmfulness to the apex seal. The rotor housing is formed at the inner wall surface with a porous Cr-Mo plating containing 0.50 to 0.90% in weight of Mo.

Rotor housing for rotary piston engines

A process for manufacturing a member having a wear resistant sliding surface. The process includes the steps of providing a metallic substrate having a surface covered by a photo-resist coating, forming the photo-resist coating with a pattern of hard and soft portions, removing the photo-resist coating at the soft portions to expose surface portions of the metallic substrate beneath the soft portions of the photo-resist coating, etching the metallic substrate with the hard portion of the photo-resist coating retained thereon to form pits in the surface portions of the metallic substrate, spraying molten filler material on the surface of the metallic substrate with the hard portion of the photo-resist coating thereon, to fill the pits with the filler material of a porous structure having an oil-retaining capability, and removing the hard portion of the photo-resist coating from the metallic substrate.

Manufacture of a wear-resistant sliding surface

A sliding member having a number of oil retaining pores is manufactured by forming a hard plating layer on a metal base, forming a masking resist film on the hard plating layer by exposure to light and development, forming a number of pores in the hard plating layer by effecting electrolytic etching at a current density of 50 to 600 A/dm.sup.2, dissolving said masking resist film and removing the same, and forming a hard ceramic film on the hard plating layer by vapor phase plating.

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Higashihiroshima, Japan

Satoshi Nanba