78results about How to "Inhibition strength decline" patented technology

To provide an alloy tool steel having high-temperature strength at an operating temperature of the order of 700° C., while maintaining room-temperature strength as high as that of a conventional matrix high-speed tool steel. The steel contains from 0.45 wt % to 0.65 wt % C, from 0.10 wt % to 1.00 wt % Si, from 0.20 wt % to 2.00 wt % Mn, not more than 0.020 wt % P, not more than 0.015 wt % S, not more than 1.00 wt % Cu, not more than 1.00 wt % Ni, from 3.50 wt % to 5.00 wt % Cr, from 0.00 wt % to 3.00 wt % Mo, from 0.00 wt % to 10.00 wt % W, from 1.00 wt % to 2.00 wt % V, from 0.00 wt % to 8.00 wt % Co, not more than 0.10 wt % Al, not more than 0.01 wt % O, not more than 0.02 wt % N, and the balance substantially constituted of Fe and unavoidable impurities, in which Weq is from 2.0 to 10.0, 2Mo / Weq is not more than 0.60, and ΔC is from −0.3 to 0.0.

The present invention relates to a vitreous silica crucible for pulling up silicon single crystals by a pulling-up process having a first stage and a second stage after the first stage. The crucible comprises a transparent inner layer containing inner layer bubbles, and an outer layer containing outer layer bubbles. The second stage expansion coefficient X2 of the inner-layer bubbles during the second stage is set to ⅓ or less of the first stage expansion coefficient X1 of the inner-layer bubbles during the first stage.

A cation exchange membrane which shows suppressed deterioration of the strength of the membrane in the upper portion of an electrolytic cell when the membrane is employed in the electrolytic cell and used for a long term, which can perform electrolysis with good production efficiency, and which can be produced simply with low cost; its production process and; such an electrolytic cell; are provided.A cation exchange membrane to be used for an electrolytic cell, which has a laminate structure comprising a first layer containing a fluoropolymer having sulfonic groups and a second layer containing a fluoropolymer having carboxylic groups and adjacent to the first layer, and which has a rectangular shape with a constant thickness;wherein the cation exchange membrane has an attachment region along one (or each) of opposed sides of the cation exchange membrane and a main region other than the attachment region;the value of the ratio (the thickness of the second layer) / (the total thickness of the first and second layers) in the attachment region is larger than the value of the ratio in the main region. Further, its production process and an electrolytic cell to which the cation exchange membrane is attached.

An electric driving device, in which a sensor magnet is fixed to a first end section of the rotation shaft of a motor. A sensor device has a rotation sensor for detecting the magnetic field of the sensor magnet. The rotation sensor faces the sensor magnet along the axial direction of the rotation shaft. A control unit mounted on the motor has an inverter circuit connected to the armature coil of the motor via a plurality of power supply wires. The inverter circuit is disposed, with respect to the axial direction of the rotation shaft, at a position further from the sensor magnet than the rotation sensor. A shield plate comprising a magnetic material is disposed between the rotation sensor and the inverter circuit.

The invention discloses a sintered ceramsite adopting tailings generated during germanium extraction of lignite as a main raw material and a preparation method of the sintered ceramsite. The sintered ceramsite comprises the components of tailings generated during germanium extraction of lignite, kaolin and water; the tailings are ground; kaolin and water are fed into the ground tailings; the mixture is stirred to be uniform; ageing is carried out for pelletizing; the finished balls are placed in a muffle furnace for preheating and calcining to obtain the sintered ceramsite. The preparation is simple in technology, low in energy consumption, relative high in waste utilization, and good in product performance.

The present invention provides, as a material superior in heat resistance in a hot environment where the maximum temperature of the exhaust gas becomes 750 to 900° C., ferritic stainless steel sheet superior in heat resistance in a broad temperature region of 750 to 900° C. with long term stability by a smaller amount of addition of Mo than SUS444 containing about 2% of expensive Mo, that is, ferritic stainless steel sheet superior in heat resistance characterized by containing, by mass %, C: 0.01% or less, N: 0.02% or less, Si: 0.05 to 1%, Mn: 0.1 to 2%, Cr: 10 to 30%, Mo: 0.1 to 1%, Cu: 1 to 2%, Nb: 0.2 to 0.7%, Ti: 0.01 to 0.3%, and B: 0.0002 to 0.0050%, having a balance of Fe and unavoidable impurities, and having a 0.2% yield strength at 750° C. of 70 MPa or more.

In a heat exchanger having a core portion in which aluminum flat tubes and aluminum fins are disposed alternatively and brazed with each other, each fin has one side portion located at one side of the tube and the other side portion located at the other side of the tube. The one side portion of the fin is higher in pitting potential than the other side portion of the fin, and the pitting potential difference between the one side portion of the fin and the other side portion of the fin is 40 to 200 mV. The pitting potential difference can be formed by the Zn concentration difference in the aluminum alloy constituting the fin.

A polar functional group is added onto a surface of a metallic member (1). A resin member (2) contains an adhesive functional group. The adhesive functional group and the polar functional group attract each other. A method for joining the metallic member (1) and the resin member (2) to each other includes a heating a junction between the metallic member (1) and the resin member (2) while pressing the metallic member (1) and the resin member (2) against each other with first load, maintaining temperature of the junction higher than melting temperature of a resin that structures the resin member (2) while pressing the metallic member (1) and the resin member (2) with each other with second load smaller than the first load, and cooling the junction to temperature lower than the melting temperature while pressing the metallic member and the resin member against each other with third load larger than the second load.

The present invention provides a cast steel for ring-shaped components that has a low average coefficient of thermal expansion in a temperature range of 20° C. to 500° C. and high strength and good oxidation resistance at 500° C., which are required for ring-shaped components for use as blade rings and seal ring retainers of gas turbines, and that can hence be used for blade rings and seal ring retainers of gas turbines. Specifically, the present invention provides a high-strength and low-thermal expansion cast steel comprising, on a mass percentage basis, 0.1 to 0.8% of C, 0.1 to 1.0% of Si, 0.1 to 1.0% of Mn, 0.01 to 0.1% of S, greater than 40% and up to 50% of Ni, not greater than 4% (inclusive of 0%) of Co, greater than 1.5% and up to 4% of Cr, 0.01 to 0.1% of Al, and 0.001 to 0.1% of Mg, the remainder being substantially Fe.

An oxygen-absorbing resin composition copolymerized polyolefin compound including a copolymerized polyolefin compound and a transition metal catalyst, wherein the copolymerized polyolefin compound is a copolymerized polyolefin compound including at least one of constitutional unit (a) selected from the group consisting of the constitutional units represented by the general formula (1), and at least one of the constitutional unit (b) having an indane ring, selected from the group consisting of the constitutional units represented by the general formulas (2) and (3).

An oxygen-absorbing resin composition having excellent performance is provided which contains an oxygen-absorbing polyester and a polyolefin and has enhanced compatibility between the polymers to give an oxygen-absorbing layer inhibited from having a reduced cohesive force or an appearance failure such as roughness unevenness. The oxygen-absorbing resin composition is characterized by being obtained by melt-kneading the following ingredients (A) and (B) together with the following ingredient (C) as a compatibilizing agent. Ingredient (A): an oxygen-absorbing polyester; Ingredient (B): a polyolefin; and Ingredient (C): a copolymer of ethylene and a vinyl monomer having a hydroxy group or an ester bond, the copolymer having an ethylene proportion of 70-99 mol %.