134 results about "Nickel based" patented technology

The invention belongs to the field of metal material processing, and particularly relates to a nuclear power nickel base alloy welding wire and a preparation method thereof.The nuclear power nickel base alloy welding wire comprises, by weight, 0.01%-0.05% of C, 0.10%-0.30% of Si, 28.5%-30.5% of Cr, 7.0%-11.0% of Fe, smaller than or equal to 0.10% of Co, 0.50%-1.00% of W, 3.0%-4.0% of Mo, 0.005%-0.010% of B, 0.1%-0.3% of Al, 0.1%-0.2% of Ti, 0.005%-0.020% of Zr, 2.0%-2.5% of Nb, 0.1%-0.5% of Ta, 0.20%-0.30% of RE, smaller than 0.005% of S, smaller than 0.005% of P, 2.0%-4.0% of nano ceramic materials and the balance Ni, the nickel-based alloy welding material is prepared through the steps of smelting, high-low temperature refining, annealing, forging, rolling, multi-pass drawing, annealing, solid solution-aging treatment, acid pickling, coating and plating, and the problems that in the prior art, when used for welding, a nickel-based alloy welding material is prone to cracks, and the strength is low due to hot corrosion can be effectively solved.

A spherical ball joint has an outer ring 2 of a nickel based material with a carbonitriding layer on a spherical inner surface 2a sliding on an inner ring 3 of a cobalt-based or nickel-based material

The invention discloses a welding method for a nickel-based alloy composite board. The nickel-based alloy composite board comprises a base material layer and a nickel-based alloy composite material layer, and a transition layer is arranged at the bonding interface of the base material layer and the nickel-based alloy composite material layer. Wherein a trapezoidal groove is machined in the position, corresponding to the base material layer, of the welding section of the nickel-based alloy composite board; a U-shaped groove is machined in the position, corresponding to the transition layer, of the welding section of the nickel base alloy; a groove is not machined in the position, corresponding to the nickel-based alloy composite material layer, of the welding section of the nickel-based alloy composite plate; a nickel-based alloy welding wire matched with the nickel-based alloy composite material layer is used, single argon tungsten-arc welding is adopted for welding the nickel-based alloy composite material layer, and a composite material layer welding seam is formed; a nickel-based alloy welding wire matched with the nickel-based alloy composite material layer is used, the transition layer is welded through single argon tungsten-arc welding, and a transition layer welding seam is formed; and the base material layer is welded to form a base material layer welding seam, and double-tungsten-electrode argon arc welding is adopted for welding the first welding bead of the base material layer.

The invention discloses a seawater conductivity sensor electrode material based on a copper-nickel-based nanostructure and a preparation method, the electrode material comprises: a substrate, a copper-nickel-based nanostructure layer being formed on the surface of the substrate; the substrate comprises an insulating compound and a coating coated on the surface of the insulating compound, the insulating compound comprises at least one of high-resistance silicon, silicon oxide, aluminum oxide ceramic and plastic, the coating comprises a metal coating and / or a semiconductor coating, and the copper-nickel-based nanostructure layer is in a dendritic crystal or cluster form. The copper-nickel alloy nanostructure is a core material of the electrode, so that the electrode material has high specific surface area and rich active sites, the measurement accuracy and measurement limit of the electrode material can be improved, the service life can be prolonged, the manufacturing cost can be reduced, and the application requirements of the ocean Internet of Things can be met.

The invention discloses a zirconium-nickel dissimilar metal welding method based on active regulation and control of a temperature field. The zirconium-nickel dissimilar metal welding method comprises the following steps that S1, base metal is cleaned; the butt-joint end faces and the welding surfaces of the zirconium and nickel alloy pipes are polished and cleaned, and clean zirconium and nickel base materials are obtained; s2, a to-be-welded part is assembled; the to-be-welded end face of the clean base metal is assembled in a protective gas cavity of the rotary clamping device; s3, welding is conducted; a laser scanner is adopted for welding at a preset welding position, heat source gradient distribution of base metal at the two ends of a welding seam is controlled by regulating and controlling laser power, welding seam temperature field feedback is established through an infrared temperature sensor, and real-time monitoring and laser power regulating and controlling are conducted; s4, postweld heat treatment; and the laser power is adjusted in real time according to welding seam temperature field feedback so as to adjust and control the welding seam cooling process. According to the method, effective connection of zirconium-nickel indissolvable metal is achieved by controlling the regional welding temperature field, the temperature range for forming brittle compounds is avoided, the uniformity of a molten pool between Zr and Ni materials is ensured, and welding defects such as hot cracks and air holes are reduced.

A shank adapter forming part of a drilling assembly includes a longitudinal axis, an external surface, an internal surface, a threaded part provided at a forward end and a plurality of splines provided at a rearward end. A machine part extends axially between the threaded part and the splines, wherein at least a part of the external surface is coated with a first corrosion protection layer of nickel and at least part of the first corrosion protection layer is coated with a polymer based sealant top layer.

The invention discloses a high-strength thin-wall nickel-based alloy steel pipe butt welding process which comprises the following steps: S1, cleaning the two sides and the back surface of a groove before welding; s2, argon arc welding and electric arc welding are combined, argon arc welding is adopted for bottoming, back face argon protection is conducted during bottoming of argon arc welding, and small swing welding is adopted during bottoming welding; s3, during filling and capping, the input of welding line energy is controlled, small and concentrated welding line energy is adopted, the welding line energy is controlled to be 25 KJ / cm or below, and the interlayer temperature is controlled to be 90-100 DEG C or below; s4, the arc starting points of the interlayer welding beads are staggered by 3-5 mm or above, and the arc craters are filled in the arc stopping process; and S5, after welding is completed, the surface forming condition of the welding seam is checked, nondestructive testing is conducted on the welding seam with the welding seam forming meeting the requirement, and the high-strength thin-wall nickel base alloy steel pipe butt welding technology can better overcome the defects that hot cracks and welding seam air holes are likely to be generated after welding.

The invention discloses a manufacturing process of an NO7718 nickel base alloy nut for nuclear equipment. The manufacturing process comprises the steps of material preparation, hot forging, shot blasting, solid solution heat treatment, physical and chemical detection, finish machining, precipitation hardening heat treatment and detection packaging. The hot forging near-net forming technology is adopted, the shape of the nut blank is directly obtained through plastic deformation, the cutting allowance of machining is greatly reduced, a large number of raw materials are prevented from becoming sweeps, the material utilization rate is remarkably increased, and the raw material cost is effectively reduced; by accurately controlling the initial forging temperature, the final forging temperature and the cooling speed of hot forging as well as subsequent solution treatment and precipitation hardening treatment, grains can be refined, and the precipitation form and distribution of a strengthening phase can be controlled, so that the microstructure of the material is optimized, and the material obtains more excellent comprehensive mechanical properties such as higher strength, plasticity and toughness cooperation; and the harsh working condition requirements of nuclear equipment can be better met. The process provided by the invention ensures the stability and consistency of product performance.

The invention relates to a hot rolling composite process for improving the strength of a low-alloy high-strength steel / nickel-based alloy bimetal composite plate, and belongs to the technical field of materials. Firstly, a welded assembly is subjected to heat preservation for 2-4 h at the temperature of 1250 DEG C, large-deformation rolling is adopted at the temperature higher than 1000 DEG C after discharging, the rolling reduction of each pass is larger than or equal to 20%, and in the stage, a composite plate is rolled to be 70% or above of the target thickness; and when the temperature is 900-1000 DEG C, rolling to a target thickness by adopting small deformation, and then cooling to room temperature in air. Effective metallurgical compounding of the bimetallic material can be realized by using the hot rolling compounding process, the obtained bimetallic compound interface is flat and straight and has no metallurgical defects such as pores and cracks, the interface of a sample subjected to three-point bending is still well compounded, and cracks are not generated macroscopically and microcosmically. According to the hot rolling composite technology, the back stress strengthening effect of a composite interface can be fully exerted, meanwhile, the proportion of dynamic recrystallization grains in the nickel-based alloy is reduced, and the strength of a nickel-based alloy layer is improved.

The invention provides an electrode loaded with an amorphous catalyst as well as a preparation method and application of the electrode. The preparation method comprises the steps that aluminum metal powder and magnesium metal powder are subjected to first mixing, and mixed aluminum-magnesium powder is obtained; the mixed aluminum-magnesium powder is sprayed on the surface of at least one side of a metal nickel base material in a vacuum plasma spraying mode, and the metal nickel base material loaded with an aluminum-magnesium alloy transition layer is obtained; carrying out second mixing on the amorphous metal source and an auxiliary agent to obtain mixed amorphous powder; the mixed amorphous powder is sprayed on the surface of the side, away from the metal nickel base material, of the aluminum-magnesium alloy transition layer in a cold spraying mode, an amorphous catalyst layer is obtained, and then a first electrode is obtained; and sequentially carrying out heat treatment and alkaline leaching on the first electrode to obtain the electrode loaded with the amorphous catalyst. The aluminum-magnesium alloy transition layer is firstly prepared on the metal nickel base material, and then the amorphous catalyst layer is prepared through the cold spraying technology, so that the binding force between the amorphous catalyst layer and the base material is effectively enhanced.

The invention discloses a welding method for optimizing a welding seam structure of a nickel-based alloy composite board. The nickel-based alloy composite board comprises a base material layer and a nickel-based alloy composite material layer, and a transition layer is arranged at the bonding interface of the base material layer and the nickel-based alloy composite material layer; the welding method comprises the steps that a trapezoidal groove is machined in the position, corresponding to the base material layer, of the welding section of the nickel-based alloy composite board; a U-shaped groove is machined in the position, corresponding to the transition layer, of the welding section of the nickel base alloy; a groove is not machined in the position, corresponding to the nickel-based alloy composite material layer, of the welding section of the nickel-based alloy composite plate, and a truncated edge is reserved; welding the nickel-based alloy composite material layer by adopting single tungsten electrode argon arc welding; welding the transition layer by adopting single tungsten electrode argon arc welding; and welding the base material layer by adopting single tungsten electrode argon arc welding.

The invention discloses a palladium-containing low-melting-point nickel-based alloy, brazing filler metal, a preparation method and application, and belongs to the technical field of metal brazing. The palladium-containing low-melting-point nickel-based alloy comprises the following raw materials in percentage by mass: 20%-40% of palladium, 5%-15% of chromium, 0.5%-8% of silicon, 2.0%-4.0% of boron, 0-1.0% of yttrium and the balance of nickel. The purity of each raw material is not less than 99.99%. The brazing filler metal prepared from the palladium-containing low-melting-point nickel-based alloy further comprises a binding agent. The mass ratio of the nickel-based alloy to the binder is 1: (0.05-0.3), and the binder is propylene glycol or resin. Compared with traditional nickel-based high-temperature brazing filler metal, the palladium-containing nickel-based brazing filler metal can remarkably reduce the brazing temperature of GH4169 high-temperature nickel-based alloy, performance damage of a high-temperature environment to base metal in the welding process can be avoided, and the overall comprehensive performance of a connector is improved.

The invention particularly discloses a preparation method and application of a three-dimensional porous foamed nickel-molybdenum alloy material. The method comprises the steps that S100, a foamed nickel matrix is selected and cleaned; s200, the cleaned foamed nickel matrix is subjected to acid pickling and activation; s300, microcosmic etching is conducted on the surface of the foamed nickel base body subjected to acid pickling activation; and S400, electro-deposition is conducted on the foamed nickel base body obtained after microcosmic etching, and then the three-dimensional porous foamed nickel-molybdenum alloy material for the water electrolysis hydrogen production electrode is obtained. The prepared alloy material is a nickel-molybdenum alloy material with a three-dimensional porous structure, and the main component of the nickel-molybdenum alloy material is nickel-molybdenum alloy, so that compared with an existing hydrogen production electrode material, the nickel-molybdenum material is lower in price, and the alloy material has higher porosity and specific surface area due to the three-dimensional porous structure; according to the present invention, the hydrogen production electrode can have more hydrogen evolution active sites, the catalytic activity is high, the nickel-molybdenum alloy structure is stable, and the catalytic activity can be maintained for a long time in the alkaline environment.

The utility model relates to the technical field of nickel base alloy smelting, and provides a nickel base alloy induction smelting feeding device which comprises a shell, an access door is fixedly connected to the upper end of the front face of the shell through a hinge, connecting bases are fixedly connected to the two sides of the bottom end of the shell, and a discharging hopper is fixedly connected to the top end of the shell. The device comprises a shell, fixing plates are fixedly connected to the upper ends of the two sides of the inner wall of the shell, servo motors are fixedly connected to the two sides of the back face of the shell, and the output ends of the servo motors extend into the shell and are fixedly connected with pressing rollers through couplings. And the elastic force of the reset spring is utilized to enable the positioning block to slide and be clamped into the proper positioning groove, so that the overall height of the outer discharging pipe and the inner discharging pipe can be changed, the mounting requirements of different induction furnace feeding ports are met, the complexity and inconvenience that the height needs to be adjusted and heightened due to different heights of the induction furnace feeding ports are avoided, and the applicability is improved.

The invention belongs to the field of composite plate processing, and particularly relates to a production method for improving the yield of nickel steel composite plates, which comprises the steps of billet cogging, nickel base alloy plate prefabrication, composite plate assembly, composite plate blank rolling, composite plate blank splitting and the like. Cogging is conducted on a steel billet under multi-pass large pressure, high-pressure water is used for spraying and cooling, and coarsening of crystal grains of a composite layer of a product is restrained; the nickel-based alloy plate is prepared by adopting rolling deformation instead of machining cutting, so that the production cost is reduced, and the production efficiency is improved; all procedures are closely linked, the thickness distribution of a product composite layer from the edge part to the core part is uniform, the problem that the thickness of the rolled product composite layer is not uniform is greatly weakened, and the yield and the finished product rate of the composite plate are remarkably improved; meanwhile, the composite board with excellent comprehensive performance can be obtained through controlled rolling and controlled cooling, the heat treatment procedure is omitted, energy conservation and emission reduction of enterprises are facilitated, industrial continuous efficient production is easier, practicability is high, and the composite board is worthy of application and popularization.

The invention relates to a nickel base alloy which comprises the following components in percentage by weight: 0.02%-0.08% of yttrium, 0%-1.54% of niobium, 6.91%-7.10% of chromium, 12.00%-16.45% of molybdenum and the balance of nickel and inevitable impurities. The invention further relates to a preparation method of the nickel-based alloy. The preparation method sequentially comprises the steps of smelting, homogenizing treatment and forging treatment. According to the nickel-based alloy and the preparation method thereof disclosed by the invention, the high-temperature mechanical property of the alloy at 700-800 DEG C is effectively improved by adding 0.02-0.08% of yttrium and 0-1.54% of niobium in percentage by weight.

The utility model relates to the technical field of compression springs, in particular to a high-temperature-resistant nickel base alloy compression spring which comprises a first flange, a fixing sleeve fixedly arranged at the top end of the first flange, a telescopic rod arranged in the fixing sleeve, a second flange fixedly arranged at the top end of the telescopic rod, and a spring body fixedly arranged at the bottom end of the second flange. A rotating sleeve is fixedly arranged at the bottom end of the spring body, a plurality of connecting blocks are fixedly arranged at the bottom end of the rotating sleeve, a connecting pipe is fixedly arranged at the bottom end of the side face of the fixing sleeve, and a plurality of connecting grooves are formed in the connecting pipe. Therefore, the stability of the rotating sleeve and the connecting block during placement is improved, the stability of the spring main body after elastic force adjustment is improved, and the adjusting effect of the device on the elastic force of the spring main body is improved.

The utility model relates to the technical field of alloy plate longitudinal cutting devices, in particular to a nickel base alloy plate longitudinal cutting device. Comprising a supporting platform, an adjusting sliding rail, an adjusting motor, an adjusting lead screw, an adjusting sliding block, a graduated scale plate, an adjusting support, a hydraulic lifting rod, a lifting toothed plate, an adjusting shaft, an adjusting gear, an adjusting supporting plate, a discharging support, a discharging pulley, a feeding assembly, a limiting assembly, a guiding assembly and a cutting assembly. The alloy plate longitudinal cutting device comprises a supporting platform, a discharging support is arranged on one side of the supporting platform, a plurality of sets of discharging pulleys are arranged on the inner wall of the discharging support, the two ends of each discharging pulley are rotationally connected with the inner wall of the discharging support, and a graduated scale plate is arranged on the upper portion of one side of the supporting platform. Through the synergistic effect of mechanisms such as motor driving, thread adjustment, hydraulic lifting and pulley unloading, accurate longitudinal cutting and rapid unloading of the nickel-based alloy plate are achieved, and the machining efficiency and operation convenience are greatly improved.

Provided is a copper-manganese-nickel based alloy having characteristics (in particular, specific resistance) close to those of a nickel-chromium based alloy. It is also an objective to provide an alloy having high processability compared to a nickel-chromium based alloy. An alloy for a resistive body includes copper, manganese, and nickel, wherein the manganese is 33 to 38% by mass, and the nickel is 8 to 15% by mass.

A hydrogen evolution electrode preparation method based on a three-period minimal curved surface structure belongs to the technical field of new energy electrolytic hydrogen production and fluid transportation, and comprises the following steps: constructing a three-dimensional model of the required three-period minimal curved surface structure; performing image slicing processing on the three-dimensional model by using slicing software; printing a required three-period minimal curved surface structure by using a plane projection micro-stereolithography 3D printer; a nanometer ultraviolet lamp is adopted to circularly irradiate the three-period extremely-small curved surface structure; soaking in a sulfuric acid solution and carrying out ultrasonic oscillation; carrying out vacuum drying and carrying out oxygen plasma hydrophilic treatment; depositing a nickel-based compact conductive layer on the three-period minimal curved surface structure by using chemical deposition; depositing a nickel-iron alloy catalyst on the three-period minimal curved surface structure of the nickel substrate by using electro-deposition; and carrying out ultrasonic oscillation with ethanol and vacuum drying. According to the application, collaborative design of catalyst distribution and a macro-microstructure is realized, and a new way is provided for preparation of a high-performance water electrolysis hydrogen production electrode.

A drill component comprising: a longitudinal axis extending axially between a first end at an axially forward end and a second end at an axially rearward end; an external surface; and an internal surface; wherein at least part of the external surface is coated with a first nickel-based corrosion protection layer nickel; and at least part of the first corrosion protection layer is coated with a polymer-based sealant top layer.

This invention relates to a palladium-nickel-based brazing filler metal and a brazing method for high-temperature brazing of ceramic materials. The composition and content (mass percentage) of the palladium-nickel-based brazing filler metal are as follows: Nb: 8.0%–15.0%; Ti: 10.0%–18.0%; Zr: 5.0%–12.0%; Hf: 2.0%–6.0%; Ni: 20.0%–30.0%; Pd: balance, with a Pd to Ni ratio of 3:2. The method includes preparing raw materials according to the filler metal composition; then melting the raw materials into alloy ingots using an electric arc melting method under argon protection; preparing strip-shaped or powdered filler metal; placing the prepared filler metal between ceramic / ceramic or ceramic / metal materials and then brazing it at high temperature in a vacuum furnace. This invention can be used for high-temperature brazing of Si3N4 ceramics, SiC ceramics and their composites, and SiBCN system ceramics and their composites, with a joint temperature resistance of not less than 900℃.

The utility model discloses a constant tension control device of a nickel base alloy wire, which belongs to the technical field of material processing, and comprises a workbench, the front side of the top of the workbench is fixedly connected with a supporting plate, the top of the inner side of the supporting plate is provided with a sliding groove, the inner side of the sliding groove is connected with a rotating roller in a clamping manner, and the rotating roller is connected with the workbench. A limiting plate is fixedly connected to the rear side of the top of the workbench, a winding roller is rotationally connected to the inner side of the limiting plate, a servo motor is fixedly connected to the top of the left side of the left limiting plate, a clamping hole is formed in the top of the right limiting plate, a limiting ring is clamped to the inner side of the clamping hole, and a control mechanism is fixedly connected to the top of the workbench. The two sides of the top of the workbench are fixedly connected with wire pressing mechanisms, and the control mechanism can detect the tension condition of the nickel-based alloy wire in real time, convert detected tension signals into electric signals and transmit the electric signals to the microcontroller.

The invention relates to the technical field of nickel-based alloy heat treatment, in particular to an additive manufacturing nickel-based alloy heat treatment device which comprises an automatic guide structure and a heat treatment structure, the side end of the automatic guide structure is in butt joint communication with the heat treatment structure, a fixed lantern ring is fixedly arranged on the heat treatment structure, and a first connecting guide rod is fixedly arranged on the fixed lantern ring; a hydraulic supporting rod is hinged to the lower end of the first connecting guide rod, the lower end of the hydraulic supporting rod is hinged to a second connecting guide rod, the second connecting guide rod is fixed to a fixing side block, the side end of the fixing side block is fixed to a supporting bottom frame, and the supporting bottom frame supports the bottom of the fixing lantern ring; according to the heat treatment device for the additive manufacturing nickel-based alloy, a first fluted disc can be controlled to rotate through a stepping motor, so that a second fluted disc is subjected to angle adjustment of a certain amplitude, the positions of an inclined seat and a first heating roller are changed, the inclined seat and the first heating roller which are symmetrically arranged move, and internal regulation and control work is conveniently carried out; and high heat treatment work can be carried out on local positions.

The utility model discloses a heat treatment device for nickel base alloy forgings, which relates to the technical field of auxiliary forging equipment and comprises a heating furnace, a fixing frame is arranged in the middle of one side of the heating furnace in a penetrating manner, an insertion plate is inserted into the fixing frame, and a fixing frame is fixedly arranged in the middle of the inner side wall of the insertion plate. The fixing frame is arranged to be of a U-shaped structure, and a fixing base is fixedly arranged in the middle of the fixing frame. The heating furnace is arranged, the fixing frame is arranged on the outer side of the heating furnace, the inserting plate is arranged in the fixing frame, the fixing base is arranged on the inner side of the inserting plate, the clamping arms are arranged on the two sides of the fixing base, and the two clamping arms are matched, so that a forge piece product can be clamped and fixed, and the product can be inserted into the heating furnace after being fixed on the inner side of the inserting plate; and after the product is heated, the product can be taken out by moving the insertion plate, and meanwhile, the product can be directly transferred to a forging table by moving the insertion plate, so that subsequent forging work can be conveniently carried out.

An electrolysis device configured to produce hydrogen gas from water, the electrolysis device comprising a container (4), the container accommodating an aqueous alkaline solution (5), a cathodic electrode (1), and an anodic electrode (2), an electrical current being selectively applied between the cathodic electrode and the anodic electrode, wherein the cathodic electrode and possibly the anodic electrode, is made of a nickel alloy, with a nickel base alloyed with at least one element chosen among chromium, molybdenum, cobalt and iron, wherein the cathodic electrode and the anodic electrode are manufactured by an additive manufacturing process, from respective first and second mixed metallic powder compounds, wherein the cathodic and anodic electrodes exhibit an outer surface comprising a plurality of first surface patterns (6,7).

This invention discloses a method for designing the composition of nickel-containing high-strength material systems based on transfer learning and the barrel theory optimization. The method includes: first, using a recursive feature elimination algorithm to screen key features across source domain benchmark data and target domain experimental data containing sparse components; second, constructing a deep neural network for pre-training on the source domain dataset, extracting nonlinear feature representations between components and performance through hidden layers; third, freezing the weights of the feature extraction layers of the pre-trained model, and for sparse samples in the target domain, introducing Bayesian ridge regression to construct a residual correction model to achieve cross-domain knowledge transfer; and finally, combining multiple metallurgical constraint criteria to perform an evolutionary search within a limited composition space. This invention solves the problem of effectively modeling sparse data in new material systems. By combining deep feature extraction with Bayesian residual correction, it significantly improves the robustness of high-strength material performance prediction and enables precise optimization of industrial-grade composition formulations.

The utility model relates to nickel base alloy processing technical field, and disclose a kind of nickel base alloy bar heat treatment device, including quenching furnace body and the transmission machine body being set in its right side, further include: the cooling tank being set in the right side of transmission machine body;For driving nickel base alloy bar after quenching cooling mobile structure, it is set in the inside of cooling tank;For preventing nickel base alloy bar to drop the shielding structure and limiting structure, it is set in the surface of mobile structure;The utility model is to provide a kind of nickel base alloy bar heat treatment device, with nickel base alloy bar after quenching moves to the top of moving frame, by the setting of cooling tank and mobile structure, nickel base alloy bar after quenching can be driven to move in the inside of cooling tank, so that nickel base alloy bar after quenching and cooling liquid in the inside of cooling tank are fully contacted, to carry out cooling treatment to nickel base alloy bar after quenching.

The invention relates to a trapping device for large-coil heavy nickel-based alloy wire rod production, and belongs to the technical field of wire rod production, the trapping device comprises a trapping cover and a fixing plate arranged above the trapping cover, the bottom of the trapping cover is open, a filter screen is arranged in the trapping cover, a gas outlet pipe is arranged at the top of the trapping cover, and a gas outlet pipe is arranged at the bottom of the trapping cover. An air exhaust mechanism is arranged in the air outlet pipe, harmful gas is sucked into the trapping cover from the bottom of the trapping cover through the air exhaust mechanism and then is exhausted from the air outlet pipe, and two protection mechanisms are arranged on the trapping cover and are symmetrically arranged front and back; the bottom opening of the collecting cover is sealed through the two baffles, dust falling on the filter screen is received by the baffles, pollution of a pickling solution on the lower portion due to falling of the dust on the filter screen is avoided, the dust intercepted on the filter screen is brushed off by the brush through movement of the scraper, cleaning of the filter screen is achieved, and the cleaning effect of the pickling solution on the filter screen is improved. The service life of the filter screen is prolonged.

The present application relates to the technical fields of high temperature creep test, in particular to a method for obtaining high temperature creep parameters of iron-nickel based alloy, which mainly determines the creep strain model of iron-nickel based alloy, obtains the creep strain rate calculation formula from the creep strain model, implements two creep tests of target test material under two different creep stresses at target temperature, respectively obtains the creep curves corresponding to creep time and creep strain, selects two creep times at the first stage and the second stage of the two creep curves respectively, obtains the creep strain and creep strain rate under the creep stress corresponding to the two creep times respectively, substitutes into the creep strain model and the creep strain rate calculation formula, and calculates the variable parameters of the creep strain model. The evaluation process of the creep model is greatly simplified, the required number of creep tests and test time are reduced, and the test cost is reduced.