摘要:
There is provided a high temperature component with a thermal barrier coating, which can be used as a high temperature component for a gas turbine, an aircraft gas turbine engine, or the like. A top coat (3) is formed of a ceramic on a bond coat (2), the bond coat (2) being formed on a heat resistant alloy substrate (1) composed mainly of at least one element of nickel and cobalt, wherein the bond coat (2) contains at least one of nickel and cobalt, chromium and aluminum , and further contains at least one selected from a group consisting of tantalum, cesium, tungsten, silicon, platinum, manganese and boron in a range of 0 to 20 wt%. The high temperature component according to the present invention has very high durability of a thermal-insulating ceramic layer, and is less susceptible to spalling damage.
摘要:
Disclosed is a power conversion device which achieves reductions in switching loss due to a reverse recovery current and heat generation loss. Specifically disclosed is a power conversion device provided with a cascode element (21) configured by electrically connecting a normally-on switching element (4) and a normally-off switching element (5) in series and connecting a gate terminal of the normally-on switching element (4) and a source terminal of the normally-off switching element (5) via a cascode connection diode (7), and a high-speed diode (6) electrically connected in parallel with the cascode element (21) and having a cathode region connected to a positive electrode terminal and an anode region connected to a negative electrode terminal.
摘要:
A multi-functional material having a carbon doped titanium oxide layer which contains the carbon being doped in the state of a Ti-C bond, and is excellent in durability (high hardness, scratch resistance, abrasion resistance, chemical resistance, heat resistance) and also functions as a photocatalyst being responsive to a visible light; and a method for producing the multi-functional material, which comprises subjecting the surface of a substrate at least the surface layer of which comprises titanium, a titanium alloy, a titanium alloy oxide or a titanium oxide to a heat treatment in an atmosphere of a combustion gas from a gas containing a hydrocarbon as a primary component or an atmosphere of a gas containing a hydrocarbon as a primary component, so as for the surface to have a temperature of 900 to 1500°C, or exposing said surface of the substrate directly to a combustion flame from a gas containing a hydrocarbon as a primary component to treat the surface with heat so as for the surface to have a temperature of 900 to 1500°C.
摘要:
A working fluid consisting essentially of CO 2 , a molecule having a low ratio of specific heats, is expanded by a gas turbine 4. Thus, even if the pressure changes between the inlet side and the outlet side of the gas turbine 4, a temperature drop as a temperature change is suppressed, so that an exhaust gas having a high temperature is obtained. Consequently, the difference between the temperature of the working fluid on the outlet side of a compressor 2 and the temperature of the exhaust gas on the outlet side of the gas turbine 4 is kept so great that a regeneration effect is enhanced, whereby thermal efficiency is increased without a decrease in the output.
摘要:
There is provided a high temperature component with a thermal barrier coating, which can be used as a high temperature component for a gas turbine, an aircraft gas turbine engine, or the like. A top coat (3) is formed of a ceramic on a bond coat (2), the bond coat (2) being formed on a heat resistant alloy substrate (1) composed mainly of at least one element of nickel and cobalt, wherein the bond coat (2) contains at least one of nickel and cobalt, chromium and aluminum , and further contains at least one selected from a group consisting of tantalum, cesium, tungsten, silicon, platinum, manganese and boron in a range of 0 to 20 wt%. The high temperature component according to the present invention has very high durability of a thermal-insulating ceramic layer, and is less susceptible to spalling damage.
摘要:
A cleaning method for removing deposition such as scale adhering to the surface of a structure and a structure using this are disclosed. A surface layer containing a radioactive catalyst (5) is formed on the structure (1). The deposition adhering to the surface layer is decomposed by irradiating the surface of the structure with radiation, and/or the adhesion of deposition to the surface layer is suppressed. An anticorrosion method for lowering the corrosion potential at the surface by forming a surface layer containing a radioactive catalyst on the structure and irradiating the surface of the structure with radiation.
摘要:
[Object] To simply and accurately determine the position of an edge, the depth or the height of a flaw including a surface crack, a corroded portion near the surface layer of a thick specimen, and a minute damage. [Solving Means] An ultrasonic flaw detection method causes an ultrasonic wave 16 to be incident on a specimen 6 from an oblique direction, detects a diffracted wave 17 generated at an edge of a flaw 20 in the specimen 6 above the flaw, and determines the position of the edge of the flaw 20 from a front surface 13 of the specimen 6 using a triangular method from an entire beam path Wt of a component 18, which directly propagates above the flaw 20, of the diffracted wave, the entire beam path passing through the flaw from the position of incidence of the component 18, and an interval S between the position of incidence and the position of detection of the ultrasonic wave or from the difference (t t - t s ) between the propagation time of a surface wave 15, to which the above relations reflect, to reception and the propagation time of the diffracted wave 18, which directly propagates above the flaw, to reception.