Loading patent…
AssigneeHitachi, Ltd.
InventorsYoshihisa Kiyotoki, Yoshiteru Chiba, Shin Kumagai, Yasuhiro Ogawa, Akira Sakamoto, Hiroyuki Shinohara
Estimating the term…
To provide a corrosion-resisting and wear resisting alloy including cobalt, nickel or iron as a base used for a sliding part or a valve seat for a machine, and restraining erosion and corrosion caused by eutectic carbide constituting the alloy in an atmosphere with dissolved oxygen. A material is selected from a cobalt base added with Cr and/or W, a nickel base added with Fe and/or Cr, and an iron vase added with Cr and/or Ni. The material is cast into an ingot or a slab to produce an intermediate material. The intermediate material comprises mesh-like eutectic carbide and a base material surrounded by the eutectic carbide. A heat plastic forming is applied to the intermediate material at a temperature 650° C. or more and the solidus temperature or less. The eutectic carbide is formed into multiple grains or clusters as a discontinuous distribution. A resulting corrosion-resisting and wear-resisting alloy has 0.1 to 0.5 of coefficient of friction, and 300 to 600 Hv of Vickers hardness without age-hardening process.
A corrosion-resisting and wear-resisting alloy, which is obtained by selecting a material from cobalt base added with Cr and/or W, nickel base added with Fe and/or Cr, and iron base added with Cr and/or Ni, casting said material into an ingot or a slab as an intermediate material, applying hot plastic forming at a temperature which is 650° C. or more and the solidus temperature or less to said intermediate material, which includes a structure comprising mesh-like eutectic carbide and a base material surrounded by the eutectic carbide, forming the eutectic carbide as a discontinuous distribution in a form of multiple grains or clusters, wherein the coefficient of friction is 0.1 to 0.5, and the Vickers hardness without age hardening process is 300 to 600 Hv.
A valve, which is provided with a valve element and a valve casing, wherein valve seats are provided on contact faces of both of the valve element and the valve casing, and a base body of said valve seats is provided with a member which comprises one type of alloy selected from a cobalt-base alloy, a nickel-base alloy, and an iron-base alloy, in which grain-like or cluster-like eutectic carbide is diffused as a discontinued distribution, and which has the coefficient of friction of 0.1 to 0.3.
A pump wherein a seat and a washer, which relatively rotate about a rotating shaft of the pump, are in contact with each other at a sealed end, and either of the contact faces of the said seat or said washer is provided with a member which comprises one type of alloy selected from a cobalt-base alloy, a nickel-base alloy, and an iron-base alloy, in which grain-like or cluster-like eutectic carbide is diffused as a discontinued distribution, and which has the coefficient of friction of 0.1 to 0.3.
An internal combustion engine, wherein a valve seat part and a valve are provided on a cylinder head of said internal combustion engine, valve seats are respectively provided on contact faces of both of said valve seat part and said valve, and surfaces of base bodies of said valve seats is provided with a member which comprises one type of alloy selected from a cobalt-base alloy, a nickel-base alloy, and an iron-base alloy, in which grain-like or cluster-like eutectic carbide is diffused as a discontinued distribution, and which has the coefficient of friction of 0.1 to 0.3.
An internal combustion engine, wherein at least either of contact faces of a valve lifter or a cam of the internal combustion engine is provided with a member which comprises one type of alloy selected from a cobalt-base alloy, a nickel-base alloy, and an iron-base alloy, in which grain-like or cluster-like eutectic carbide is diffused as a discontinued distribution, and which has the coefficient of friction of 0.1 to 0.3.
A rotating device comprising:
A liquid pressurizing device comprising:
Dependencies are inferred from the claim text.