摘要:
A coating material has a first layer deposited on a base material and a second layer deposited on the first layer. The first layer is made of a Ni-base alloy or a Co-base alloy containing carbon as an unavoidable impurity. The second layer is made of a hard material containing carbide and a metal component. The first layer serves as a barrier for preventing carbon from being diffused from the second layer into the base material to prevent the base material from being carburized.
摘要:
A manufacturing method, particularly a forging treatment and a heat treatment method of a Ni-based alloy having sulfidation-corrosion resistance used for component members of corrosion-resistant high-temperature equipment, that is, Waspaloy (a trademark of United Technologies) or its improved Ni-based alloy wherein the high temperature sulfidation-corrosion resistance of the alloy can be improved while maintaining hot strength properties is disclosed. A Ni-based alloy used for the method consists essentially of 0.005 to 0.1% C, 18 to 21% Cr, 12 to 15% Co, 3.5 to 5.0% Mo, not more than 3.25% Ti and 1.2 to 4.0% Al (expressed in mass percentage), with the balance substantially comprising Ni. In the manufacturing method of a Ni-based alloy having improved sulfidation-corrosion resistance, the alloy is, after finish hot-worked at a temperature below carbide dissolving temperature, subjected to solution treatment at a temperature below the carbide dissolving temperature and below re-crystallization temperature and subjected to stabilizing treatment and aging treatment.
摘要:
A high-temperature sulfidation-corrosion resistant nickel-base alloy includes 12.about.15 weight % of cobalt, 18.about.21 weight % of chromium, 3.5.about.5 weight % of molybdenum, 0.02.about.0.1 weight % of carbon, at most 2.75 weight % of titanium, and at least 1.6 weight % of aluminum. The remainder is essentially of nickel except for impurities. The high-temperature sulfidation-corrosion resistant nickel-base alloy has sufficient high-temperature strength and is highly resistant to a high-temperature sulfidation corrosion.
摘要:
A manufacturing method, particularly a heat treatment method of a Ni-based alloy having sulfidation-corrosion resistance used for component members of corrosion-resistant high-temperature equipment, that is, Waspaloy (a trademark of United Technologies) or its improved Ni-based alloy wherein the high temperature sulfidation-corrosion resistance of the alloy can be improved while maintaining hot strength properties is disclosed. A Ni-based alloy used for the method consists essentially of 0.005 to 0.1% C, 18 to 21% Cr, 12 to 15% Co, 3.5 to 5.0% Mo, not more than 3.25% Ti and 1.2 to 4.0% Al (expressed in mass percentage), with the balance substantially comprising Ni. In the manufacturing method of a Ni-based alloy having improved sulfidation-corrosion resistance, the alloy is, after solution heat treatment, subjected to stabilizing treatment at a temperature not lower than 860° C. and not higher than 920° C. for 1 to 16 hours, and aging treatment at a temperature not lower than 680° C. and not higher than 760° C. for 4 to 48 hours.
摘要:
A method for manufacturing a screw rotor for use in a hydraulic machine which has a pair of rotors engageable with each other to compress fluid, pump fluid or expand fluid. The screw rotor includes a shaft, a screw body including a number of stacked thin plates bonded with one another, and a cavity provided in the screw body and formed by openings of the stacked thin plates. The method of manufacturing a screw rotor includes the steps of preparing a number of thin plates having at least one opening, stacking the thin plates in such a manner that a through hole of the thin plate receives a shaft, filling a cavity formed by the openings of the stacked thin plates with powdery pressure medium, and bonding the stacked thin plates with one another by diffusion bonding under a hot isostatic pressing process.
摘要:
A screw rotor for use in a hydraulic machine which has a pair of rotors engageable with each other to compress fluid, pump fluid or expand fluid, and a method of manufacturing such a screw rotor. The screw rotor comprises a shaft, a screw body including a number of stacked thin plates bonded with one another, and a cavity provided in the screw body and formed by openings of the stacked thin plates. The method of manufacturing a screw rotor comprises the steps of preparing a number of thin plates having at least one opening, stacking the thin plates in such a manner that a through hole of the thin plate receives a shaft, filling a cavity formed by the openings of the stacked thin plates with powdery pressure medium, and bonding the stacked thin plates with one another by diffusion bonding under a hot isostatic pressing process.
摘要:
The invention provides an arc spraying torch head including: a pair of spray material guides attached to a head body so as to face forward and guiding a flexible wire-like spray material inserted therein; a main air nozzle attached to the head body, and jetting main air toward a melting area of the spray material; the head body being provided with an auxiliary air nozzle which jets auxiliary air toward the melting area; the direction of jetted auxiliary air by the auxiliary air nozzle is tilted with respect to the direction of jetted main air by the main air nozzle, the auxiliary air being jetted toward the melting area; and a spray direction of the spray material being inclined with respect to the direction of the jetted main air.
摘要:
The invention provides a method for performing abrasion resistant surface treatment on a surface of a rotary member. The abrasion resistant surface treatment method is characterized by including steps of: dividing the surface of the rotary member into a plurality of areas A1, A2 depending on peripheral speed or treatment difficulty in surface treatment of the rotary member 1; spraying an abrasion resistant material on a surface of a first area where the peripheral speed is the highest, or the treatment difficulty is low, by a high speed flame spraying method; and spraying an abrasion resistant material on a surface of the second area with high treatment difficulty, by an arc spraying method.
摘要:
To provide heat-resistant alloy members that maintain the resistance to corrosion at high temperature of the chromized layer formed on Ni- or Co-base heat-resistant alloys and which yet are improved in various mechanical properties. The improved Ni- or Co-base heat-resistant alloy member having a chromized layer that is characterized by having a chromium concentration of 25-80% and a thickness of 10-100 .mu.m. This member is produced by controlling both the vapor pressure of a chromium halide being used in chromization and the temperature therefor in such a way that the chromized layer being formed is adjusted to have a chromium concentration and a thickness within the ranges specified above.