1458 results about "Thermal shock" patented technology

The invention relates to the technical field of temperature control of high-precision industrial heating equipment, in particular to an anti-interference precise temperature control method and system for heating an upper die, and the method comprises the steps: starting a multi-region heating array, heating the upper die to a target temperature according to a preset temperature rise curve, and building a uniform thermal field; before the high-pressure medium is introduced, heat load change caused by the high-pressure medium is predicted based on medium process parameters; in the medium introduction process, dynamic anti-interference compensation control is executed, a feedforward power compensation instruction based on a thermal load and a feedback power fine tuning instruction based on temperature deviation are generated respectively, and the feedforward power compensation instruction and the feedback power fine tuning instruction are weighted and fused into a composite power driving signal for adjusting a heating array; when the temperature fluctuation converges to a stable threshold value, the feedforward compensation weight is gradually reduced, smooth switching to steady-state control is achieved, transient thermal shock caused by a high-pressure medium is effectively restrained through feedforward and feedback cooperative compensation and dynamic weight adjustment, the temperature fluctuation is reduced, and the temperature control precision and stability are improved.

The invention relates to a modified chrome corundum ramming material and a preparation and construction process thereof, and belongs to the technical field of chrome corundum ramming materials. The ramming material comprises a material A, a material B and a material C, wherein the material A comprises chrome corundum aggregate, titanium dioxide coated aluminum oxide microspheres, calcium sulfide dehydrate and silicon carbide porous microspheres; the material B comprises chromium oxide-zirconium oxide composite nano powder, sodium thiosulfate pentahydrate, tricalcium phosphate and hexagonal boron nitride flaky crystals; and the material C comprises an aluminum dihydrogen phosphate-magnesium hydroxide compound, a calcium fluoride-aluminum oxide co-melt and a silane coupling agent. The preparation process comprises the steps of pretreatment of all the components, preparation of composite powder and layered preparation. The construction process comprises the steps of pretreatment, wet-process mixing, layered ramming, negative-pressure permeation, medium-temperature reaction, spraying curing, integral firing and the like. Generation of hexavalent chromium can be effectively inhibited, the thermal shock resistance, the mechanical strength and the heat-conducting property of the material are remarkably improved, and the material has the advantages of being good in environment friendliness, long in service life, excellent in construction performance and the like.

The invention relates to the technical field of rare earth metal electrolysis cathode protection coatings, in particular to a high-temperature-corrosion-resistant yttrium-stabilized zirconia gradient coating on the surface of a tungsten cathode. A metallurgically bonded strong bonding bottom layer is constructed on a tungsten substrate through surface pretreatment and reactive sintering, then an atmosphere plasma technology is adopted to spray a creep-resistant gradient layer with continuous components to buffer thermal stress, and finally a sol-gel technology is utilized to construct an extremely compact corrosion-resistant surface layer in a superposition mode. The high-temperature-corrosion-resistant yttrium-stabilized zirconia gradient coating is constructed through a multi-scale and multi-mechanism synergistic effect, the problems that a tungsten cathode coating is insufficient in binding force and poor in thermal shock resistance are fundamentally solved, molten salt permeation can be blocked, and the service life of a tungsten cathode in a severe environment is remarkably prolonged.

The invention discloses a thermal shock failure prediction and laser repair device for a thermal barrier coating and an application method. The device comprises a multi-physics field coupling simulation analysis module, a thermal shock experiment loading module, an online damage monitoring and failure diagnosis module, a robot laser repair execution module and a central control and data processing core unit. A thermal-mechanical-chemical coupling model is established to predict a coating failure behavior, a high-frequency induction heating and gas quenching system is adopted to simulate an extreme thermal shock environment, a multi-band thermal infrared imager, an ultrasonic probe and a digital image related system are integrated to monitor damage evolution in real time, and in-situ repair of a damaged area is realized based on a six-degree-of-freedom industrial robot. According to the method, the whole-process closed-loop control from failure prediction to repair regeneration is realized, the problems of single function and lack of multi-field coupling analysis and real-time repair capability in the prior art are solved, and the service reliability evaluation precision and the remanufacturing efficiency of the thermal barrier coating are remarkably improved.

The invention relates to the technical field of machine tool control, in particular to a milling cutter positioning self-adaptive control method and system. Comprising the following steps: synchronously collecting structure state data and external environment parameters of a machine tool in a preset sampling period; based on the structure state data, the external environment parameters and thermal-structure and dynamic physical characteristic parameters of the machine tool, a positioning deviation prediction model is established in a preset look-ahead time window, and the future three-dimensional total positioning deviation of the milling cutter relative to the theoretical track is obtained; and a prospective compensation instruction opposite to the future three-dimensional total positioning deviation is generated according to the future three-dimensional total positioning deviation, and compensation motion of the milling cutter is achieved. The problem that in the prior art, in the long-time operation process of a machine tool, the actual position of a milling cutter deviates from a preset path due to an internal heat source, and an existing thermal error compensation model cannot accurately predict and deal with severe and local thermal shock caused by sudden change of an external environment, so that the machining precision is affected is solved.

The invention discloses a special composite enamel coating for a chromium-nickel alloy base material and a preparation method of the special composite enamel coating, when the special composite enamel coating structurally comprises one layer, the special composite enamel coating comprises the following components in parts by mass: 40-65 parts of a basic glass phase, 30-55 parts of a high-melting-point ceramic reinforced phase, 2-10 parts of a thermal expansion coefficient regulator and 0.5-5 parts of an interface bonding accelerant. Compared with the prior art, the enamel coating can achieve nearly perfect thermal expansion coefficient matching with a chromium-nickel alloy matrix, a tough chemical bonding interface is formed, the enamel coating can stably work for a long time in the extreme high-temperature environment of 1,100 DEG C or above, and meanwhile the enamel coating has the excellent abrasion resistance, repeated rapid cooling and rapid heating cycle resistance and thermal shock resistance.

The invention discloses a preparation process of a sintering kiln silicon carbide guide roller with thermal shock resistance and high-temperature corrosion resistance. The process comprises the following steps: sequentially carrying out surface pretreatment such as reticulate pattern laser engraving, sand blasting and cleaning and drying on a silicon carbide guide roller substrate; performing plasma spraying on a pure aluminum oxide coating after preheating; carrying out segmented laser remelting on the coating to improve the compactness; and finally, coating the nano silicon carbide slurry, calcining and curing. The thermal shock resistance and the high-temperature corrosion resistance of the guide roller are remarkably improved by enhancing the binding force of the coating through laser engraving, optimizing the density of the coating through laser remelting and combining post-treatment of nano silicon carbide slurry, and the service life of the guide roller in a lithium battery positive electrode material sintering kiln is prolonged.

The invention relates to the field of furnace lining materials, in particular to a rapid repairing material for a tapping hole and a furnace lining of an intermediate frequency furnace. The rapid repairing material comprises the following components in parts by weight: 50-70 parts of tabular corundum, 10-20 parts of fused magnesite, 8-15 parts of alumina micro powder, 3-8 parts of nano zirconia, 5-12 parts of silicon carbide, 10-15 parts of silica sol and 2-5 parts of a reinforcing agent. Wherein the reinforcing agent is titanium calcium aluminate coated with chromium nickel boride. The tabular corundum is mainly used as an integral framework; the fused magnesite is matched with the alumina micro powder to form magnesium aluminate spinel with a high melting point; the nano zirconium oxide can fill pores and is excellent in toughness; the silicon carbide has the advantages of high hardness, high thermal conductivity and high melting point; the reinforcing agent is titanium calcium aluminate coated with chromium nickel boride, although the adding amount is small, the high-temperature strength, toughness and thermal shock resistance of the repairing material can be remarkably improved, and especially the long-term corrosion resistance can be remarkably improved.

The invention discloses a lightweight alumina foamed ceramic refractory material and a preparation method thereof, and relates to the technical field of ceramic materials. When the light aluminum oxide foamed ceramic refractory material is prepared, zirconium acetylacetonate, yttrium nitrate hexahydrate and aluminum nitrate nonahydrate are mixed to prepare a spinning solution for electrostatic spinning, nano aluminum titanate is loaded by using a nano spraying technology during spinning, and doped modified zirconium oxide fibers are prepared after high-temperature heat treatment and defibering and dispersing; mixing aluminum oxide micro powder, hollow aluminum oxide, a high-temperature foaming agent, doped modified zirconium oxide fibers and a sintering aid, and then performing ball milling and sieving to prepare aluminum oxide-based mixed powder; and carrying out mold pressing on the alumina-based mixed powder to prepare a green body, sintering, and cooling to prepare the lightweight alumina foamed ceramic refractory material. The light aluminum oxide foamed ceramic refractory material prepared by the invention has the advantages of light weight, low thermal conductivity, high compressive strength, high bending strength and good thermal shock resistance.

The invention provides a sleeve testing device and a strength checking and correcting method, and relates to the technical field of offshore high temperature and high pressure, and the device comprises a temperature control system which is used for providing a steady-state high-temperature simulation environment and a transient high-temperature simulation environment for a sleeve sample; the loading system is used for applying axial, radial and internal loads to the casing sample; the monitoring system is used for monitoring a surface temperature field, inner wall strain and leakage of the casing sample; and the data processing and control unit is respectively connected with the temperature control system, the loading system and the monitoring system. The method adopts the device and comprises the following steps: selecting a casing sample, fixing a sensor and completing initial calibration; heating the whole casing pipe and keeping the temperature constant, and applying instantaneous thermal shock to a specific area; synchronously applying axial, radial and internal loads; cooperatively monitoring the temperature field, the strain and the leakage rate to form an associated database; and correcting the safety coefficient. The invention solves the problems of single test temperature and insufficient load coupling of the traditional casing, and is suitable for casing performance evaluation.

The invention discloses an automatic grading device for thermal shock cracks of a coating and an application method. Comprising a terahertz wave detection module, a laser ultrasonic excitation and detection module, a high-precision three-dimensional motion control platform, a multi-mode signal synchronous acquisition and processing unit, a crack intelligent grading evaluation unit, an environment simulation and temperature control unit, a protective shell and a human-computer interaction interface. The near-surface dielectric property change of the coating is represented through the terahertz technology, the deep mechanical property evolution is detected through the laser ultrasonic technology, the thermal shock service condition is reproduced in combination with a high-temperature environment simulation unit, and a multi-modal feature fusion algorithm and a physical model and machine learning collaborative inversion model are adopted to obtain the thermal shock resistance of the coating. And automatic quantitative evaluation and severity grading of the depth, density, length and network connectivity of the thermal shock cracks of the thermal barrier coating are realized. The problems that an existing single detection method is insensitive to vertical cracks, poor in high-temperature environment adaptability and low in manual evaluation efficiency are solved.

The invention relates to the technical field of printed electronic materials, in particular to conductive copper ink for a printed circuit and a preparation method of the conductive copper ink. The conductive mica powder-graphene composite material comprises conductive mica powder, a nano-copper-graphene filler, flaky copper powder, spherical copper powder, an organic carrier, a dispersing agent, a coupling agent, an antioxidant and an auxiliary agent, a layer-point composite conductive structure is constructed through conductive mica powder and nano-copper-graphene filler, a close packing system is formed by combining particle size grading of copper powder with different morphologies, and the conductivity is guaranteed; by means of a chemical bonding interface formed by the coupling agent, the copper powder and the organic carrier, the integrity of the coating is enhanced, and stress cracking during welding is reduced; microencapsulated rosin in the auxiliary agent promotes wetting and spreading of the welding flux, titanate modified nano titanium dioxide constructs a three-dimensional cross-linked network to improve the bending resistance and thermal shock resistance of the coating, the falling phenomenon of components after welding is reduced, and the stability of the conductive copper ink in actual printed circuit production is improved.

The invention relates to the technical field of coating materials, and particularly discloses a metallurgical strengthening preparation process of a wear-resistant coating of a high-stress valve ball. Comprising the following steps that S1, a porous structure supporting layer is prepared, specifically, cobalt-based alloy powder and a pore forming agent are mixed according to the mass ratio of (85-92): (8-15), and a porous middle layer is formed on the surface of a sphere base body through sintering; s2, coating slurry is injected; s3, sintering is carried out; s4, carrying out laser micro-texture treatment; s5, embedding a solid lubricant; s6, performing hot isostatic pressing densification; and S7, vibration auxiliary polishing is conducted. The metallurgical strengthening preparation process for the wear-resistant coating of the high-stress valve ball can be used for surface strengthening treatment of high-parameter valve core ball parts in the fields of petrochemical engineering, electrical energy, aerospace and the like, and has the advantages of high bonding strength between the coating and a matrix, excellent high-temperature wear resistance and thermal shock resistance, stable friction coefficient, long service life, high wear resistance and the like. And the method has the advantages of high process adaptability and low bonding failure risk.

The invention belongs to the technical field of electric control cabinet heat dissipation structure data processing, and particularly relates to an electric control cabinet heat dissipation structure parameter optimization method and system based on a genetic algorithm, and the method comprises the steps: obtaining the multi-source dynamic thermal load data of a to-be-optimized electric control cabinet in a complete process period, and constructing a transient heating power function; constructing a transient thermal resistance network model containing flow field coupling characteristics, defining a to-be-optimized structure parameter vector, and determining flow field thermal resistance coupling efficiency; based on the transient thermal resistance network model, utilizing a genetic algorithm to carry out iterative optimization on the structure parameter vector, calculating a transient thermal shock response index of the key component, and constructing a fitness function according to the transient thermal shock response index to evaluate individual advantages and disadvantages; and when the genetic algorithm meets a preset termination condition, outputting an optimal structure parameter combination, and generating a heat dissipation structure model based on the optimal structure parameter combination. According to the invention, transient thermal shock and dustproof requirements can be effectively balanced.

The invention discloses a high-thermal-conductivity graphene fiber composite material based on conjugate interface adaptation and a preparation method thereof, and relates to the technical field of fiber composite materials. According to the method, a conjugated interface conformation adaptive design of an interface phase is realized by utilizing a functionalized phenylsilane coupling agent through active sites of topological wrinkles on the surface of a graphene fiber, and a molecular conjugated interface layer with an efficient heat conduction path and a strong mechanical interlocking effect is formed. According to the graphene fiber / epoxy resin composite material treated by the method, the interfacial shear strength can reach 90 MPa, the in-plane heat conductivity coefficient reaches up to 550 W / mK, and the performance retention rate exceeds 98% after 100 times of thermal shock cycles. By regulating and controlling the adaptability of the fiber surface wrinkle structure and the interface molecule conformation, the problem that a traditional carbon fiber modification method is insufficient in applicability on graphene fibers is solved, the thermal and mechanical property synergistic effect of the graphene fiber composite material is remarkably improved, and the graphene fiber composite material is suitable for a stable advanced thermal management system in an extreme thermal environment.

The invention discloses a preparation method of high-performance cordierite DPF honeycomb ceramic, and belongs to the technical field of honeycomb ceramic carrier preparation. The preparation method comprises the following steps: mixing raw materials; kneading mud; performing extrusion molding; drying and shaping; cutting and firing to obtain a cordierite honeycomb ceramic carrier; and performing boundary dimension processing, film covering, hole dotting, mud scraping and drying to obtain a finished product. According to the invention, aluminum hydroxide is adopted to replace or partially replace aluminum oxide in the formula of the cordierite porous ceramic structure while magnesium hydroxide is used, and the two substances can form a synergistic heat absorption mechanism by virtue of the difference of the aluminum hydroxide and magnesium hydroxide in thermal decomposition temperature, so that the heat absorption efficiency of the cordierite porous ceramic structure is greatly improved in the low-temperature coke discharge stage of a carrier mud blank. Aluminum hydroxide is subjected to a decomposition reaction before magnesium hydroxide, and then magnesium hydroxide is continuously decomposed at a higher temperature, so that the temperature range covered by the whole heat absorption process is greatly widened, the heating rate of the carrier mud blank is effectively slowed down, and thermal shock caused by sudden rising of local temperature is avoided.

Novel hybrid tunnel boring methods, systems, and apparatuses are described. Example hybrid methods integrate (a) thermal processing, e.g., preconditioning and / or thermal spallation (which may be used as pre-treatment), and (b) mechanical processing while boring tunnels in rock and other formations. Thermal processing and mechanical processing may be used alternatively or simultaneously. For example, the preconditioning may use thermal energy to induce thermal shock and weaken the rock (e.g., cause expansion stress, micro-fractures, thermal spallation, etc.). This preconditioning changes the relevant properties of the rock relative to the additional (e.g., mechanical) excavation, including, among other things, effective compressive stress, abrasion properties, and hardness. This preconditioned rock can therefore be efficiently removed using mechanical drilling tools, resulting in, for example, faster boring speeds, reduced tool wear, enhanced precision, and longer deployment lengths (e.g., in comparison to conventional TBM and especially MTBM approaches).

The invention discloses an experimental device and method for positioning and artificially manufacturing fractures in a borehole and expanding the fractures. The experimental device comprises a tubular column carrier unit, and a positioning anchoring system, a mechanical fracture forming pretreatment system, a thermal shock fracturing system and a control terminal which are integrated on the tubular column carrier unit. The positioning anchoring system is used for detecting the well wall and locking the target depth and direction; the mechanical crack-making pretreatment system is used for cutting at the locking position to form an initial physical gap; the thermal shock fracturing system presets a thermal stress field through a heating assembly, and utilizes a cold shock assembly to spray low-temperature fluid to generate transient temperature difference stress to induce cracks to crack from notches and expand. And the control terminal controls the action time sequence of each system. According to the method, through the mode of mechanical drilling and thermal coupling, fixed-point and directional accurate fracture forming in a borehole is achieved, the generated fracture shape is close to that of a natural fracture, and the problems that a traditional method is inaccurate in positioning, uncontrollable in shape and large in damage to the whole sample are solved.

The invention provides a temperature-field-controllable rock material thermal-mechanical coupling damage mechanism experimental device and method, and belongs to the technical field of rock thermal shock. The device comprises a loading platform which is provided with a supporting unit and a pressing unit, and the pressing unit can move towards the supporting unit so as to load axial pressure on a rock sample placed on the supporting unit; the heating module is used for carrying out heating and heat preservation treatment on the upper section of the rock sample; the cooling module is used for cooling and preserving heat of the lower section of the rock sample; the isolation module is used for isolating the middle section of the rock sample, is provided with a temperature field monitoring unit and is used for monitoring the temperature gradient change of each part in the rock sample in real time; the heating module, the cooling module and the isolation module cooperate with each other and are used for simulating the temperature condition in the underground rock. According to the method, the distribution condition of the internal temperature field in the rock thermal shock process can be quantitatively represented through experiments, and people can deeply understand the action mechanism of rock thermal shock damage.

The invention provides a magnesium aluminate spinel-CMA multiphase material and a preparation method thereof, and belongs to the field of refractory materials. The refractory material comprises the following raw materials in percentage by mass: 80-87% of Al2O3, 6-19% of high-calcium magnesia and 1-7% of CaO. The mass percentage of the binding agent is 1-6% of the sum of the raw materials. The magnesium aluminate spinel-CMA multiphase material with excellent performance is synthesized from low-grade high-calcium magnesia, CMA large grains are tightly wrapped by magnesium aluminate spinel small grains, and a CMA phase and a magnesium aluminate spinel phase are uniformly distributed, so that the magnesium aluminate spinel-CMA multiphase material has the advantages of magnesium aluminate spinel and CMA materials, namely the magnesium aluminate spinel-CMA multiphase material has the characteristics of high hardness, wear resistance, thermal shock resistance, erosion resistance and the like.

The invention discloses daily high-strength environment-friendly ceramic and a preparation process thereof, and particularly relates to the field of ceramic materials, and the preparation process comprises the following steps: S1, preparation and molding of green body powder, S2, preparation of multifunctional glaze slip, and S3, glazing and sintering. By introducing the pre-compounded reinforced fiber, the SiO2-Al2O3 coating on the surface of the pre-compounded reinforced fiber and the ceramic matrix form strong interface bonding at high temperature, so that the comprehensive mechanical property of the green body is improved, the load is effectively transmitted and dispersed, and meanwhile, the fiber has remarkable toughening and impact resisting effects; due to the addition of the biomass derived porous carbon powder, the fracture toughness and thermal shock resistance of the material are further improved through the pore-forming and buffering effects of the biomass derived porous carbon powder; while high bending strength is maintained, impact toughness is improved in a breakthrough manner, and the composite material is more suitable for collision scenes in daily use.

The invention relates to the technical field of high-temperature sintering, and particularly discloses a gradient composite kiln furniture based on spinel interface strengthening and a preparation method thereof. Wherein the kiln furniture sequentially comprises a mullite matrix layer, a silicon carbide enhancement layer and a zirconium oxide high-temperature-resistant layer from outside to inside, and the layers are chemically bonded through an in-situ generated MgAlO spinel interface layer. The preparation method comprises the following steps: carrying out layered tape casting on gradient slurry, carrying out isostatic pressing lamination molding, generating an MgSi transition phase at 1380-1420 DEG C through a stepped sintering process, and heating to 1600-1650 DEG C at a specific heating rate to form a continuous spinel interface. According to the kiln furniture, gradient component design cooperates with spinel interface strengthening, the problem of interface stripping caused by thermal expansion mutation of a traditional double-layer structure is solved, and the kiln furniture has excellent thermal shock stability and high-temperature strength retention rate. According to the preparation method, precise construction of the spinel interface is realized through staged reaction control.

The invention relates to the technical field of ceramics, and particularly discloses green special refractory ceramic slurry as well as a preparation method and application thereof. The green special refractory ceramic slurry is prepared from aluminum oxide, methyltrimethoxysilane-phosphoric acid modified polysiloxane, fluorocarbon emulsion, expanded vermiculite powder, silane coupling agent modified feldspar tailing powder, a dispersing agent, an organic silicon defoaming agent, a polyurethane curing agent and deionized water. After being sintered, the green special refractory ceramic slurry provided by the invention has excellent high-temperature stability, corrosion resistance, thermal shock resistance and mechanical strength, and solves the problems of low high-temperature-resistant upper limit and poor corrosion resistance of the traditional slurry, so that the sintered ceramic adapts to severe high-temperature working conditions such as steel plant converter liners and chemical high-temperature reaction kettle inner walls; and long-term protection requirements of industrial equipment are met.

Novel hybrid tunnel boring methods, systems, and apparatuses are described. Example hybrid methods integrate (a) thermal processing, e.g., preconditioning and / or thermal spallation (which may be used as pre-treatment), and (b) mechanical processing while boring tunnels in rock and other formations. Thermal processing and mechanical processing may be used alternatively or simultaneously. For example, the preconditioning may use thermal energy to induce thermal shock and weaken the rock (e.g., cause expansion stress, micro-fractures, thermal spallation, etc.). This preconditioning changes the relevant properties of the rock relative to the additional (e.g., mechanical) excavation, including, among other things, effective compressive stress, abrasion properties, and hardness. This preconditioned rock can therefore be efficiently removed using mechanical drilling tools, resulting in, for example, faster boring speeds, reduced tool wear, enhanced precision, and longer deployment lengths (e.g., in comparison to conventional TBM and especially MTBM approaches).

The invention provides a method for prolonging the high-temperature service life of a thermal barrier coating of a hydrogen-doped gas turbine. The method comprises the steps that Ni, Co, Cr, Fe, Al, Hf, Si and Y are smelted and cast into master alloy according to the proportion; preparing the mother alloy into high-entropy alloy powder through an inert gas atomization process; high-entropy alloy powder is deposited on the surface of the high-temperature alloy substrate by adopting a high velocity oxy-fuel spraying process, and a bonding layer of the thermal barrier coating is obtained; and preparing a thermal barrier coating on the bonding layer by adopting a plasma spraying process, and carrying out vacuum heat treatment on the thermal barrier coating in advance. The high-entropy alloy bonding layer provided by the invention has better thermal stability, and can still keep strong bonding force between the ceramic layer and the bonding layer alloy after water quenching high-temperature thermal cycle service. And the transition group high-entropy alloy bonding layer is beneficial to formation of a thermal growth oxide layer, has an inhibition effect on diffusion of metal elements and coating degradation in the hydrogen-induced corrosion and high-temperature steam corrosion processes, and can prolong the high-temperature thermal shock service time of the hydrogen-doped gas turbine.

The invention relates to the technical field of mold temperature control, and particularly discloses a pulse cooling and heating intelligent mold temperature controller and a control method. Comprising a plurality of mold cavity surface temperature sensors, a waterway temperature sensor, a flow sensor, a liquid electromagnetic valve group, a mold heater and a control unit electrically connected with the sensors, the electromagnetic valve group and the heater, according to the method, the mold surface temperature fluctuation can be obviously reduced, the mold surface temperature peak-peak fluctuation after pulse cooling control is obviously reduced, and the dimensional stability and the surface quality of an injection molding part can be improved; through zoning temperature control, the temperature difference of all parts of the mold is reduced, and warping and internal stress concentration can be reduced; due to the fact that the low-temperature refrigerant is adopted, the heat exchange efficiency is obviously improved, the cooling time is shortened, and the production efficiency is improved; and through the real-time monitoring and protection strategy of the flow / temperature difference, the risks of mold thermal shock and equipment failure caused by abnormal cooling are reduced.

The invention relates to the technical field of material corrosion tests, in particular to a thermal shock test system for a turbine blade coating. The turbine blade coating thermal shock test system comprises an environment simulation subsystem and a test execution subsystem, the environment simulation subsystem is used for generating a gas flow, a gas outlet of the environment simulation subsystem is communicated with a gas inlet of the test execution subsystem, and the test execution subsystem comprises a test part and a test piece bearing mechanism. The test piece bearing mechanism comprises a test piece fixing assembly and an angle adjusting assembly, the test piece fixing assembly comprises a test bed and a test piece clamp, the bottom end of the test piece clamp is fixedly connected with the driving end of the angle adjusting assembly, and the test piece clamp is used for fixing a turbine blade test piece; the angle adjusting assembly is used for driving the test piece clamp to drive the turbine blade test piece to deflect to a preset angle. According to the turbine blade coating thermal shock test system provided by the invention, deflection of the turbine blade test piece in high-temperature combustion gas flow can be realized, and the working state of the rotatable guide vane is truly simulated.

The invention discloses a PTC ceramic material and a preparation method thereof, and relates to the technical field of PTC, and the PTC ceramic material is prepared from the following components: 50-65 parts of barium titanate, 12-16 parts of lead tetraoxide, 0.1-0.3 part of yttrium oxide, 0.1-0.3 part of lanthanum oxide, 6-15 parts of modified silicon boride, 4-10 parts of aluminum oxide, 1-3 parts of ammonium polyacrylate, and 3-6 parts of polyvinyl alcohol. Through synergistic cooperation of a barium titanate main body and functional fillers such as modified silicon boride, leap-type improvement of the comprehensive performance of the PTC ceramic material is realized, on the basis of maintaining excellent PTC characteristics, the heat conductivity coefficient and the breaking strength of the material are effectively improved, the thermal shock resistance and the mechanical reliability are remarkably enhanced, and the PTC ceramic material has good application prospects. The method is especially suitable for the high-end application fields of automotive electronics, industrial control, high-power LED driving and the like.

The invention discloses a gradient preparation method of a compact barrier type rare earth ceramic coating, and belongs to the technical field of high-temperature protective coatings. The preparation method comprises the following steps: pretreating a tungsten electrode substrate; sequentially preparing a sensor layer integrated with a distributed optical fiber sensor, a gradient transition layer which is realized by adopting a four-channel synchronous powder feeding technology and has continuous and gradual components, and a self-adaptive layer which is prepared by adopting a laser-induced in-situ synthesis technology and contains high-entropy rare earth zirconate and an intelligent additive; the self-healing layer contains a triple temperature triggering microcapsule system; and finally, post-processing and function activation are carried out. The prepared coating forms an intelligent response type gradient composite structure from inside to outside, has excellent interface bonding strength, thermal shock resistance and high-temperature chemical stability and has damage self-healing and service state real-time monitoring functions, and the service life of the tungsten cathode under the severe working condition is remarkably prolonged.

The invention relates to the field of energy efficiency monitoring, in particular to an industrial park energy efficiency monitoring method and system based on digital twinning, and the method comprises the steps: collecting a source thermal shock temperature, a cooling water flow, a pipe network environment temperature and the actual power consumption of a water chilling unit, and calculating a benchmark reference temperature through a sliding time window; a transient thermal power deviation degree is obtained by combining a current temperature difference value and a cooling water flow so as to quantify thermal load disturbance, then a heat flow transmission delay step length is calculated by combining pipe network parameters and the cooling water flow so as to obtain dynamic thermal shock strength, and finally a drift correction factor is calculated through the strength, and an ARIMA model coefficient is adjusted so as to quantify thermal load disturbance. And predicting an expected energy consumption baseline and comparing actual power consumption to judge the running state of the unit. By sensing the upstream working condition, restoring the pipe network transmission characteristics and adaptively correcting the ARIMA model, accurate energy efficiency monitoring is achieved, and false alarm is avoided fundamentally.