118results about How to "Reduce thermal stress" patented technology

The pre-EGR gas cooler 1 for cooling the EGR gas introduced from the EGR pipe, and an post-EGR gas cooler for introducing the pre-EGR gas cooled in the EGR gas cooler 1 to cool it to a target cooling temperature are coupled in series, and an EGR valve is mounted for controlling the flow rate of the EGR gas between the pre-EGR gas cooler 1 and the post-EGR gas cooler 3. According to the invention, EGR gas cooling apparatus with improved durability can be obtained, and EGR valves with low product cost and high storage efficiency can be provided.

A laser includes an Nd:YVO₄ crystal end-pumped with diode-laser light having a wavelength at which the absorption coefficient for Nd:YVO₄ is less than about 0.35 (35%) of the absorption coefficient at 808 nm.

A bonding structure includes a first member, a second member and a bonding member. The first member has a plate shape and is made of a carbon-base material. The first member serves as a heat diffusion member that transfers heat at least in a thickness direction, which is perpendicular to a plane of the plate shape. The second member is bonded to the first member through the bonding member. The first member has a metal thin film at least on an opposed surface that is opposed to the second member. The bonding member is disposed between the opposed surface of the first member and the second member. The bonding member is provided by a sintered body of metal particle. For example, the bonding structure is employed in a cooling unit including a heat source.

The adhesive composition of the invention comprises (A) a thermoplastic resin with a Tg of no higher than 100° C. and (B) a thermosetting component, wherein the (B) thermosetting component includes (B1) a compound with an allyl group and (B2) a compound with a maleimide group.

In an exhaust gas turbocharger for an internal combustion engine comprising a radial flow exhaust gas turbine and a compressor, which is connected to the turbine via a shaft, the turbine having a radial inflow duct and a radial inlet flow passage, which leads to the turbine wheel and in which a variable geometry vane structure for changing the cross-section of the radial inlet flow passage is supported between two support walls fixed to the turbine casing, one of the support walls projects into the inflow duct, in such a manner that the rear side of this support wall is spaced from the inner wall of the inflow duct wall so that the exhaust gas within the inflow duct is in contact also with the rear side of this support wall.

There is provided bonding material having a Young's Modulus after hardening of not less than 20% of articles to be bonded, and an average linear coefficient of thermal expansion after hardening of not more than 70% of the articles to be bonded. This bonding material can suppress deformation of a honeycomb segment due to thermal stress to be generated by a bonding material layer and can suitably be used at the time of manufacturing exhaust gas trapping filters capable of reducing the generation of defects such as a crack, and above all, a diesel particulate filter (DPF) for trapping particulate matter (particulates) in exhaust gas from the diesel engine.

A system for fiber optic packaging includes a first substrate and a first deformable pad coupled to the first substrate. The first deformable pad is characterized by a thermal conductivity greater than 1 W/mK. The system also includes a fiber coil having at least a portion embedded in the first deformable pad to provide physical contact between the at least a portion of the fiber coil and the first deformable pad. The system further includes a second substrate coupled to the fiber coil and at least a portion of the first deformable pad.

A manufacturing method of a semiconductor device includes forming a metal mask on a substrate or on a layer provided on the substrate, and removing at least one of the substrate and the layer provided on the substrate selectively through a dry etching treatment with use of the metal mask. The metal mask has a first open pattern and a second open pattern. The first open pattern is opened at a given area of the metal pattern. The second open pattern is opened at an area dividing the metal mask.

The present invention provides a semiconductor device exhibiting an improved reliability. A semiconductor device comprises a semiconductor chip having an electrode on a surface thereof and a mounting substrate, and the electrode (aluminum electrode) of the semiconductor chip is coupled to the mounting substrate through a bump (solder bump 104). A plurality of diffusion barrier films (UBM 112) for preventing a diffusion of a material composing the bump is provided between the electrode and the bump, and the diffusion barrier film is formed to have a plurality of divided portions via spacings therebetween.

The invention discloses a combustion zone pore step type porous medium burner, and relates to the field of burners. The burner comprises a burner outer shell, and a protection zone, a preheating zone and a combustion zone are sequentially arranged in the burner outer shell in the air current flow direction; the preheating zone and the combustion zone are filled with porous media; a plurality of porous medium layers of different pore density are formed in the combustion zone in the radial direction; and pore density of the porous media of the porous medium layers in the combustion layer is smaller than pore density of the porous media of the preheating zone. According to the combustion zone pore step type porous medium burner, sharp temperature gradient, nonuniform temperature distribution and local high temperature zones near a flame surface can be effectively avoided, the phenomena of nonuniform flame distribution and unstable flame are successfully avoided, combustion is more sufficient, NOx and CO emission is greatly reduced, solid temperature of the wall surface can be regulated, heat loss of the wall surface is reduced, combustion efficiency of the burner is improved, temperature change of solids is smooth, thermal stress is low, and service life of the burner is prolonged.

Provided is a fuel supply system for a marine structure using a high-pressure natural gas injection engine. The fuel supply system includes: a boil-off gas (BOG) compression unit configured to receive and compress BOG generated in a storage tank storing a liquefied gas; a reliquefaction apparatus configured to receive and liquefy the BOG compressed by the BOG compression unit; a buffer tank configured to receive the liquefied BOG from the reliquefaction apparatus and separate the reliquefied BOG into a gaseous component and a liquid component; a high-pressure pump configured to receive the liquid component from the buffer tank and compress the liquid component; and a high-pressure gasifier configured to gasify the liquid component compressed by the high-pressure pump and supply the gasified liquid component to the high-pressure natural gas injection engine.

The present invention provides a subsea transfer system for cryogenic fluids comprising reinforced concrete conduits (RCC), and stationary rollers that are anchored to the bottom of RCC, and one or more pipe-in-pipe that is supported on rollers along with insulation in the annulus. Each RCC is pre-cast with spigot and bell ends, and fits together with rubber gasket/sealant at joints. RCCs are installed first to form a dry path for pipeline(s). Once the RCC and stationary rollers are installed, a cryogenic pipeline having pipe-in-pipe configuration is then pulled into the RCC through and supported on the stationary rollers. As such a robust RCC protected pipe-in-pipe system for transfer of cryogenic fluids under water are established.

The present invention is low carbon steel ingot slowly cooling annealing process and belongs to the field of ferrous metallurgy technology. The low carbon steel ingot slowly cooling annealing process includes heating demolded steel ingot in a furnace to 800-900 deg.c, maintaining for some time, cooling in the furnace to 760+/-15 deg.c, maintaining for some time, cooling in the furnace to 650+/-15 deg.c, and discharging at the temperature not higher than 200 deg.c. The present invention has raised steel ingot demolding temperature, heating and temperature maintaining after demolding to eliminate stress caused by inside and outside temperature difference and stepped maintaining and cooling, and can reduce stress during steel ingot cooling and avoid cracking.

The invention belongs to a casting technology and relates to a method for casting a large-scale die for isothermal forging by using K403 high-temperature alloy. The method for casting the large-scale K403 high-temperature alloy die for isothermal forging comprises the following steps of: designing a casting drawing according to a die requirement, and determining a machining allowance, a casting comprehensive shrinkage rate, a gating system and the position and the size of a dead head; manufacturing a sand mold and drying, preparing a raw material according to alloy chemical components, and smelting and pouring; pouring the casting and keeping in a vacuum state for at least 20 minutes, and discharging and cooling; keeping cooling after discharging and opening a box after finishing solidification; and reducing the temperature of the casting of which the casting head is cleaned step by step, and discharging. By the method, the thermal stress is reduced effectively, cracks and breakage can be prevented, the quality of the die can be improved and the service life of the die can be prolonged by strictly controlling the individual components such as carbon, zirconium and the like and subsequent cooling and cleaning processes, and improving the process, so the method has great actual application value.

The present invention relates to shaped bodies made of fiber-reinforced ceramic composites and comprising a core zone and at least one covering layer which has a coefficient of thermal expansion which is higher than that of the core zone. The covering layer is an SiC-rich covering layer and is divided into segments which are separated from the adjacent segments by gaps or bridging zones of a material which is different from the material of the segments. The invention also relates to a process for producing such shaped bodies by infiltration of an intermediate body with molten silicon and their use for friction disks, in vehicle construction or as protective plates.

The invention discloses a thermal barrier coating system, which comprises a base body, a bonding layer and a multilayer ceramic coating, wherein the multilayer ceramic coating is formed on the bonding layer and comprises a reinforcing layer, a transition layer and a toughness enhancing thermal insulation layer which are sequentially formed on the bonding layer, and vertical cracks are arranged on the toughness enhancing thermal insulation layer. In the thermal barrier coating system, the ceramic coating is provided with the toughness enhancing thermal insulation layer with the sufficient vertical cracks, the ceramic coating has the characteristic of high stress toughness through the existence of the vertical cracks, the thermal mismatch relieving capability of the ceramic layer is enhanced, and the thermal stress in the ceramic layer is reduced, so the characteristics of efficient thermal barrier and long service life are obtained. The reinforcing layer is prepared near an interface easy to generate unsticking, the oxygen atom diffusion resistance can be enhanced, in addition, the layer separation invalidation position is transferred from the interface to a position inside the ceramic layer far away from a thermal growth oxide layer (TGO), simultaneously, the transition layer is formed between the toughness enhancing thermal insulation layer and the reinforcing layer, the thermal mismatch stress can be effectively reduced, and the thermal barrier coating system has the characteristic that the service life is long.

A portable tankless water heater includes a heat exchanger disposed in a sealed housing with an inlet cold water line and an outlet hot water line extending outside the sealed housing. A burner, disposed in an operative relationship with said heat exchanger is provided for heating water flowing through said heat exchanger and an exhaust system induces draft of air from a housing air inlet through said heat exchanger and out of a housing flue outlet.

The invention relates to a slag line brick for a steel ladle and a preparation method. The slag line brick for the steel ladle is prepared from, by weight, 10-40 parts of fused magnesite with the particle size greater than or equal to 3 mm but smaller than 5 mm, 5-30 parts of fused magnesite with the particle size greater than or equal to 1 mm but smaller than 3 mm, 10-20 parts of fused magnesite with the particle size smaller than 1 mm, 5-20 parts of magnesite-carbon waste brick fine powder, 12-16 parts of flaky graphite, 1-3 parts of bonding agent and 4 parts or less of additive. The slag line brick has the advantages that the problem that an existing slag line brick frequently produces a steamed bun shape in the using process is solved, the slag line brick for the steel ladle adopts phenolic resin having better wettability and moisture retention property, the pug temperature is strictly controlled, the phenomenon that mixed pug is dried too fast due to too high temperature is avoided, the adding amount of metal or alloy powder is appropriately controlled by increasing critical particle size, the graphite adding amount is increased, a heat stress is buffered by introducing a trace amount of additive, and the thermal shock resistance stability of the slag line brick is improved.

An electrohydraulic transmission controller (7), a transmission device with an electrohydraulic transmission controller and a vehicle drive train that features an electrohydraulic transmission controller are disclosed. The electrohydraulic transmission controller is constructed with a plurality of electrically actuatable pressure control valves (9 to 16), as well as with a plurality of valve arrangements (17 to 34) that can be acted on in each case by an hydraulic precontrol pressure depending upon the actuation of the pressure valves, by way of which valve arrangements switching elements (A to E) of a transmission device can be acted on in each case with a control pressure to produce a required operating state of the transmission device. An additional pressure control valve (9) is provided to adjust a precontrol pressure (p_VS_—9) of an additional valve arrangement (35), whereby downstream of the additional valve arrangement, the sub-assembly (6) of a vehicle drive train can be acted on by a cooling oil volume flow subject to the precontrol pressure of the additional valve arrangement and an operating state of the additional valve arrangement (35) corresponding to it.

The invention relates to a deformation control method in a rigid heat-insulating tile coating forming process, belongs to the technical field of a porous ceramic heat-insulating material, and can be used for preparing a heat shielding material of an aircraft such as a space shuttle and the like. The method comprises: applying coating slurry to the surface of a rigid heat-insulating tile ceramic base body which is initially processed to a certain thickness and shape; after drying, putting the coated base body material at a high temperature to be sintered for thermal treatment; after sintering for thermal treatment, taking out the base body material from the high-temperature environment and cooling the base body material to room temperature; and finally carrying out secondary processing to reduce the base body material to the finally required thickness. Compared to a conventional method which directly processes the base body material to the finally required thickness and then carries out coating forming, deformation of the rigid heat-insulating tile in the coating forming process can be effectively controlled.

The invention provides an embossed laser beam implementation method for reducing cracks on a cladding layer. The embossed laser beam implementation method comprises the following steps of: 1, dividing a laser beam L emitted by a laser device into two laser beams L1 and L2 by a laser beam splitter; 2, reflecting the laser beams L1 and L2 to a laser beam shaping element respectively through laser full reflectors to finish light intensity distribution conversion; and 3, combining the two converted light beams by a laser beam combiner to obtain a required embossed light beam in laser power density distribution, and applying the light beam to the surface of a pretreated cladding test piece so as to realize cladding process. The invention also provides an embossed laser beam implementation device for reducing the cracks on the cladding layer. The embossed laser beam implementation method and device for reducing cracks on the cladding layer have the technical effects that the size and the power density distribution of the finally output embossed laser beam can be conveniently controlled; the laser cladding is executed by the embossed light beam, so that preheating and slow cooling effects can be achieved; the cracking tendency of the cladding layer can be effectively reduced.

A thermal treatment system for semiconductors comprises an outer tube made of silicon carbide, a base hermetically supporting a lower portion of the outer tube, a lid selectively opening and closing an opening formed in a central portion of the base, and a reactor wall surrounding an outer peripheral wall and the like of the outer tube and having a heater provided on an inner side, wherein an annular sealing member and an annular supporting member are interposed between the outer tube and the base, and wherein the supporting member has an effective heat transfer coefficient of 50 to 2,000 W/(m²·K).

A method and arrangement in connection with an inverter that comprises several power semiconductor components and a control apparatus arranged to control them, the control apparatus being arranged to control the power semiconductor components in response to a control quantity to generate an output voltage. The method comprises the steps of determining the change of the temperature or a quantity affecting the temperature of one or more power semiconductor components, and controlling with the control apparatus the power semiconductor components in response to both the control quantity to generate an output voltage and the change rate of the temperature or quantity affecting the temperature of the power semiconductor components to reduce the temperature change and the change rate.

The invention discloses a method for preparing Al2O3-GdAlO3-ZrO2 ternary eutectic ceramics. The Al2O3-GdAlO3-ZrO2 ternary eutectic ceramic with different shapes and sizes, which are difficult to prepare in the prior art, can be obtained by adopting a laser near net forming method through layered manufacturing/layered stacking. In the preparation of the Al2O3-GdAlO3-ZrO2 ternary eutectic ceramics disclosed by the invention, the upper surface of a sample is scanned in a reciprocating manner by a method of gradually reducing laser power, so that temperature compensation of the Al2O3-GdAlO3-ZrO2 ternary eutectic ceramics in the cooling process is realized, the cooling speed of the sample is retarded, the temperature of the formed sample is gradually reduced, further thermal stress in the cooling process is reduced and the formation of cracks is inhibited. The Al2O3-GdAlO3-ZrO2 ternary eutectic ceramics have high forming speed, and no Mo crucible or Ir crucible with high price is needed, sothat the pollution which is possibly caused by the crucible is avoided and the production cost is reduced; in addition, solidification structures of the obtained Al2O3-GdAlO3-ZrO2 ternary eutectic ceramics are refined by 25 times or above compared with that of a sample structure obtained by Bridgman method; besides, the size of the obtained sample is 2 to 3 times that of a sample obtained by a laser levitation zone melting method, and the application range of the materials is widened.

A double-layer liquid-absorbing core without openings for efficient cooling of turbine guide vanes, including a partition outer ring, turbine blades, stationary blade holding rings, ribs, and a double-layer liquid-absorbing core heat plate; the turbine blades are arranged on the partition outer ring and the static Between the blade holding rings, the upper surface of the stationary blade holding ring communicates with the interior of the turbine blade, and the lower surface communicates with the ribs. The turbine blade includes a thermal barrier coating and a metal blade wall, the thermal barrier coating is coated on the outer surface of the metal blade wall, and the double-layer liquid-absorbing core is attached to the inner surface of the metal blade wall. The turbine blade is the evaporating section, and the stationary blade holding ring is the condensing section. The invention keeps the temperature distribution of the cooling blade uniform, reduces the thermal stress caused by the temperature difference, and prolongs the service life of the blade; avoids the mixing of cooling air and high-temperature gas, and the aerodynamic loss caused by the mixing, and improves the reliability of the engine; double-layer suction The liquid core structure increases the carrying limit and capillary limit of the hot plate structure; the blade has no openings, which ensures the integrity of the blade and improves the mechanical strength of the blade; improves cooling efficiency, reduces fuel consumption, and improves engine efficiency.

A thermal shield for reducing thermal stress induced proximate to a first joint formed between adjacent engine casing components in a gas turbine engine. The thermal shield includes a cover structure for covering a radially inner portion of at least one of the engine casing components. The cover structure is disposed proximate to the first joint and attached to the respective engine casing component so as to limit exposure of a covered inner portion of the engine casing component to hot gases in an interior volume defined by the engine casing components. A thermally insulating layer is disposed between the cover structure and the engine casing component for effecting a reduced amount of heat transfer to the covered inner portion of the engine casing component from the hot gases in the interior volume defined by the engine casing components.

The invention relates to a manufacture method of large-powered thyristor die, belonging to semiconductor manufacture technical filed. The method firstly puts silicon slice, silicon bonded aluminium foil containing silicon and molybdenum slice into die arrangement according to their widthes, then sending die arrangement into sintering furnace whose pressure is changed to 2x10-2)Pa and temperature remaining for a while, then slowly decreasing to 480 DEG C when heating is stopped and continually decreasing below 400 DEG C, when the temperature decreases to 250 DEG C stop and decreasing the temperature to normal one, acquiring large-powered thyristor die. The invention uses silicon bonded aluminium foil to make silicon and molybdenum joint together, which can decrease melting point of silicon bonded aluminium foil, as well as increases liquidity and of solder, and strengthen capability of diffusion and penetration between solder and silicon slice and molybdenum, decreasing thermal stress of silicon, aluminum and molybdenum, and increasing rate of finished products of thyristor die by more than 10%.

The invention belongs to the technical field of production of duplex stainless steel products used at low temperature, and in particular relates to a treatment method for improving the toughness of steel. 1) After the steel is forged, the furnace is charged at a furnace temperature not higher than 350°C and preheated twice. ; then solid solution treatment; then cooling, put into clear water with an initial temperature of less than 10°C, and keep it for 20 minutes at a cooling rate of 4-6 seconds/mm. The steel solution treatment process includes the following steps: ① heating, Control the heating rate, preheating temperature, solid solution temperature and holding time in the low temperature section to reduce thermal stress and obtain a better two-phase structure ratio; The precipitation will significantly reduce the plasticity and toughness of steel.

The invention discloses a switched reluctance motor with a water injection type winding and an axial-radial-circumferential multi-directional self-circulating ventilation system, which belongs to thetechnical field of motors, and aims to solve the problem of high temperature of the existing large-capacity switched reluctance motor. A rotor shaft is mounted on a base through a bearing, a rotor core is mounted on the rotor shaft, a stator core is mounted on the inner wall of the base, a stator copper winding is mounted on the stator core, the rotor core is located in the stator core and a mounting clearance is reserved between the two, a stator direct cooling water pipe is located in the stator copper winding, the two ends of the stator direct cooling water pipe respectively penetrate through the base and are connected to an inlet and an outlet of a direct cooling water driving device, a rotor direct cooling air passage is provided in the rotor core, a stator direct cooling air passageis provided in the stator core, a flaky heat conduction plate is also arranged on the inner wall of the base, and the flaky heat conduction plate corresponds to the stator direct cooling water drivingdevice outside the base. The cooling effect of each component in the large-capacity switched reluctance motor is enhanced, and the switched reluctance motor is simple in structure and convenient to implement.

A disclosed gas deep carburizing method for stainless steel is characterized by comprising: employing a 1Cr17Ni2 stainless steel material to make a part, cleaning the part, and removing a passive film; putting the part into a well-type carburizing furnace added with a carburizing agent toluene and a carburizing catalyst ammonia gas, performing carburizing processing by dividing into three stages, and after carburizing is finished, performing oil cooling on the part. The carburizing technology is low in carburizing temperature, the depth of a carburized layer reaches 0.75 mm or more, the surface of a carburized stainless steel part has no cracks, and the hardness of the carburized layer of the part subjected to quenching reaches 63 HRC or more.