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

Method for casting large-scale K403 high-temperature alloy die for isothermal forging

ActiveCN102107260AReduce thermal stressPrevent cracks and even breakageFoundry mouldsFoundry coresChemical compositionShrinkage rate
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.
Owner:SHAANXI HONGYUAN AVIATION FORGING

Thermal barrier coating system

InactiveCN102423935AIncreased ability to moderate thermal mismatchReduce thermal stressCeramic layered productsThermal insulationCeramic coating
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.
Owner:XI AN JIAOTONG UNIV

Slag line brick for steel ladle and preparation method

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.
Owner:海城利尔麦格西塔材料有限公司

Embossed laser beam implementation method and device for reducing cracks on cladding layer

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.
Owner:TONGLING UNIV

Method for preparing Al2O3-GdAlO3-ZrO2 ternary eutectic ceramics

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.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Double-layer wick imperforated high-efficiency cooling turbine guide vane device

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.
Owner:DALIAN UNIV OF TECH

Switched reluctance motor with water injection type winding and axial-radial-circumferential multi-directional self-circulating ventilation system

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.
Owner:HARBIN UNIV OF SCI & TECH
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