35results about How to "Eliminate cracks" patented technology

The invention relates to a heat treatment method for additive manufacturing of a nickel-based superalloy, and relates to the technical field of additive manufacturing. The heat treatment method comprises the following steps that the additive manufacturing nickel-based superalloy is placed at the first temperature, and first-step stress relief annealing treatment is carried out; and then the temperature is increased to a second temperature for second-step stress relief annealing treatment, and after cooling, the additive manufacturing nickel-based high-temperature alloy subjected to stress relief annealing treatment is obtained. The first temperature is 850-890 DEG C, and the second temperature is 900-950 DEG C; carrying out solution treatment on the additive manufacturing nickel-based superalloy subjected to the stress relief annealing treatment to obtain the additive manufacturing nickel-based superalloy subjected to the solution treatment; and aging treatment is conducted on the additive manufacturing nickel-based superalloy obtained after solution treatment, and the additive manufacturing nickel-based superalloy obtained after heat treatment is obtained. The method is mainly used for improving the volume fraction of the gamma'phase of the additive manufacturing nickel-based superalloy, obtaining the gamma 'phase with high cubic degree and proper size, and eliminating cracking and recrystallization caused by residual stress.

The invention relates to the technical field of metal materials, in particular to a preparation method of a high-performance molybdenum alloy based on a composite additive manufacturing process. According to the method, the toughened metal particles are added into the molybdenum alloy, so that cracks generated by the molybdenum alloy in laser powder bed melting can be effectively eliminated, and the novel crack-free molybdenum alloy is prepared. Meanwhile, the hot isostatic pressing technology is used for further reducing holes in the novel crack-free molybdenum alloy and improving the organization structure, so that the mechanical property of the novel crack-free molybdenum alloy is improved, and the molybdenum alloy with high compactness and high performance is prepared.

The invention discloses a polyethylene glycol complexing agent as well as a preparation method and application thereof and belongs to the technical field of medicines. The polyethylene glycol complexing agent comprises the following components in percentage by mass: 1-2% of mesenchymal stem cell source exosome modified by miRNA-138-5p, 1-2% of mesenchymal stem cell source exosome modified by miRNA-21, 1-2% of mesenchymal stem cell source exosome modified by lncGm36569, 1-2% of mesenchymal stem cell source exosome modified by mRNA of SNARE family protein, 1-2% of mesenchymal stem cell source exosome modified by mRNA of SNARE family protein and the balance of water. 1-2% of mesenchymal stem cell source exosome modified by mRNA (messenger Ribonucleic Acid) of syntachilin, and the balance of polyethylene glycol. The polyethylene glycol complexing agent disclosed by the invention can reconstruct spinal cord continuity and improve a spinal cord injury microenvironment, so that a neurological function is recovered.

The invention discloses high-phosphorus and high-sulfur free-cutting steel and a production method thereof. The high-phosphorus and high-sulfur free-cutting steel comprises the following chemical components: 0.51 to 0.56 percent of C, 0.06 to 0.13 percent of Si, 0.80 to 1.0 percent of Mn, 0.041 to 0.065 percent of P, 0.08 to 0.10 percent of S, less than or equal to 0.010 percent of Als, 0.0015 to 0.0030 percent of Ca, 0.16 to 0.22 percent of Mo, 1.90 to 1.98 percent of Cr and 8 to 12 percent of Mn / S. Before converter blowing, high-phosphorus slag and drossing iron are added into a converter, then molten iron is added, phosphorus and sulfur in molten steel at the end point of the converter meet the requirements of a finished product, and the temperature of the molten steel at the end point is 1630-1660 DEG C; the low-alkalinity slag is manufactured through LF refining, the alkalinity is controlled to be 1.0-1.2, and component control and the manganese-sulfur ratio are stable; and the temperature of LF carried-out molten steel is 1530-1540 DEG C. According to the method, ferrous sulfide and ferrophosphorus alloy are not added behind the converter, the sulfur content fluctuation caused by unstable sulfur yield in the refining process is avoided, the manganese-sulfur ratio fluctuation is reduced, cracks are eliminated, the quality of the continuous casting billet is improved, and the production cost is reduced. Meanwhile, the effective utilization of waste resources is realized.

The invention discloses a biological magnesium-based composite material with a gradient structure and a preparation method of the biological magnesium-based composite material, and the magnesium-based composite material is prepared from the following components in percentage by mass: 5.0% of Mn, 3.5-6.5% of Zn, unavoidable impurity elements and the balance of Mg. According to the method, under the low rolling friction speed, grains can be rapidly and obviously refined, the bar is stressed in three directions, the shape and size precision of the bar is obviously improved, and the grain size of the bar is in gradient distribution from the surface to the interior of the bar. In addition, the size and distribution of metal Mn particles are also improved in the three-way rolling friction process, so that the biological magnesium-based composite material with better mechanical performance and corrosion resistance is obtained.

The invention relates to the technical field of martensitic steel, in particular to a 04Cr13Ni5Mo stainless steel plate rolling and temperature control process, which comprises the following steps: heating a pretreated blank to 1190-1210 DEG C at a heating rate of more than 0 DEG C and less than or equal to 5 DEG C / min, and soaking for more than or equal to 2 hours; the rolling reduction rate of the blank is controlled to be 12%-15%, and compared with the reduction rate of the pass before final rolling, the reduction rate is reduced by 20%-25%; stacking slow cooling is larger than or equal to 550 DEG C, and the plate yield is increased by 30% or Through heat treatment processes of normalizing at 1040 DEG C + / -10 DEG C, preserving heat of a plate with the thickness of 85 mm for 4 hours, preserving heat of a plate with the thickness of 115 mm for 5 hours, tempering at 620 DEG C + / -10 DEG C, preserving heat of the plate with the thickness of 85 mm for 6 hours and preserving heat of the plate with the thickness of 115 mm for 8 hours, the yield ratio is stabilized at 0.8-0.85, and the uniformity of mechanical properties is improved by 25%. The stable yield ratio reduces the deformation amplitude of plates and workpieces by more than 40% during later processing, additional repair is not needed, and the production cost is reduced.

The present application relates to a display device and a manufacturing method thereof. The display device includes: a substrate including a display front portion, a display bending portion, a non-display bending portion, and a non-display rear portion; a display layer attached to the display front portion and the display bending portion; a member attached to the inner side of the substrate and including a connecting portion attached to the inner side of the non-display bending portion; and a window attached to the outer side of the display layer; wherein: the display layer is attached to the outer side of the substrate; at least a portion of the display bending portion forms a first substantially bending surface; at least a portion of the non-display bending portion forms a second substantially bending surface; the non-display rear portion forms a substantially flat surface; at least one of the connecting portions has a cross-sectional width that decreases in a direction away from the substrate; and at least two of the connecting portions contact each other to form a second substantially bending surface of the non-display bending portion.

The invention discloses a manufacturing method of a lead-tin-copper alloy-steel bimetal plate. The manufacturing method comprises the following steps that lead-tin-copper alloy powder is flatly laid on a steel plate; placing the steel plate on which the powder is laid in a mesh belt sintering furnace, raising two ends by using cushion blocks, and carrying out primary sintering; rolling the primary sintered plate, and then carrying out secondary sintering on the primary rolled plate; and the secondarily sintered plate is rolled and then leveled, and a finished plate is obtained. The cushion blocks are adopted in the mesh belt sintering furnace to block up a steel plate, so that fluctuation of a temperature field is accelerated, the temperature field is promoted to keep high uniformity, and the quality of a sintered plate is improved; according to the method, the primary sintering temperature and the secondary sintering temperature are controlled, so that the lead loss is reduced, the quality of a sintered product is ensured, and the sintering efficiency is improved. According to the manufactured lead-tin-copper alloy-steel bimetallic plate copper alloy, the particle size of lead is reduced, distribution is uniform, and the frictional wear performance is improved.

This invention discloses an electron beam additive manufacturing method for molybdenum-rhenium alloy based on positive defocus-induced in-situ recovery. Using electron beam additive manufacturing equipment and molybdenum-rhenium alloy powder as raw material, the method proceeds according to the following steps: 1. Establishing a vacuum environment and preheating the substrate; 2. Setting electron beam melting parameters, then scanning and melting the powder layer with the electron beam along a preset path, repeatedly laying powder layers and scanning to obtain a shaped part; after each powder layer is completely melted and before laying the next powder layer, the electron beam focusing state is adjusted to positive defocus, and the electron beam is used to scan the interlayer thermal compensation area of ​​the solidified region. This method, by introducing interlayer in-situ thermal compensation under positive defocus mode, constructs a thermal field distribution that facilitates the in-situ dynamic recovery of molybdenum-rhenium alloy during the electron beam powder bed melting process, achieving optimization of the microstructure and effective release of residual stress, avoiding brittle fracture of the additively manufactured component, and is applicable to fields such as nuclear energy engineering and aerospace.

The invention discloses a motor friction plate curing and clamping tool and a clamping method, the curing and clamping tool comprises an upper connecting plate and a lower connecting plate which are connected together through a bolt, a friction plate and a base plate are sequentially stacked on the lower connecting plate, and a spring is placed between the base plate and the upper connecting plate. Compared with the prior art, the clamping tool has the positive effects that the clamping tool is composed of the bolts, the connecting plates, the base plates, the nuts, the springs and the like, the clamping pressure is 0.2-0.3 MPa, the motor friction plate is clamped and solidified through the clamping tool, glue on the surface of the metal matrix can be fully bonded with a friction material, and cracks are avoided. Compared with a hot pressing process, the clamping tool is used for carrying out a cold pressing and clamping curing process, so that the production efficiency can be obviously improved, and the energy consumption is reduced.

The present invention discloses a forming die for the upper shell of an automobile battery box, wherein a first stretching die assembly for first stretching a segment with a maximum height portion on the upper shell of the automobile battery box, a second stretching die assembly for second stretching for integrally forming the upper shell of the automobile battery box, and a shaping die assembly for shaping the corners of the formed product to an arc transition are sequentially arranged between the upper die assembly and the lower die assembly, wherein the first upper die of the first stretching die assembly, the second upper die of the second stretching die assembly, and the shaping upper die of the shaping die assembly are all connected to the upper die assembly, and the first lower die of the first stretching die assembly, the second lower die of the second stretching die assembly, and the shaping lower die of the shaping die assembly are all connected to the lower die assembly. Therefore, it greatly improves production efficiency, saves production costs, avoids welding defects, and also avoids the risk of airtight leakage.

This invention discloses an infrared camouflage composite yarn, its preparation method, and its application. The preparation process involves first preparing a preform, then dispersing aluminum powder and tin-doped indium oxide powder on a softened film to form an infrared-resistant film. The infrared-resistant film is then coated onto the preform using a layered structure design to prepare a composite preform. Combined with heat treatment, the yarn is then hot-stretched to obtain the improved infrared camouflage composite yarn. The infrared camouflage composite yarn prepared by this invention not only possesses excellent infrared camouflage capability and durability, but the addition of functional particles does not significantly affect the yarn's mechanical properties, such as breaking strength. The functional particles maintain uniform dispersion, improving the uniformity of infrared camouflage performance. This method is suitable for preparing infrared camouflage products, such as military jackets, tents, and backpacks.

This invention discloses a method for preparing a fluorine-free heating and insulating riser, relating to the field of casting technology. The method includes first modifying micron-nano composite aluminum powder with a silane coupling agent, then in-situ reducing and loading zero-valent iron-cerium dioxide catalytic sites, followed by sequentially coating with phenolic resin and a potassium nitrate-manganese dioxide composite oxygen source, and finally forming a silica shell through interfacial hydrolysis and condensation to obtain a core-shell structured composite heating agent. Separately, hollow aluminosilicate microspheres are etched to create pores, then vacuum-impregnated and filled with an organic-inorganic composite aerogel, followed by hydrophobic modification and coating with nano-alumina sol to obtain a composite insulating material. The heating agent is then mixed with the insulating material, mullite powder, corundum powder, expandable graphite, waste glass powder, and a binder, and the mixture is vibrated, compacted, and allowed to cure to obtain the finished product. This invention solves the problems of difficult heating and poor insulation in fluorine-free risers by constructing a multi-level core-shell heating structure and a porous, multi-level insulating structure.

The utility model relates to a riveting die and riveting equipment, the riveting die is used for the riveting equipment, the riveting die comprises a riveting die body, a cavity is formed in the top of the riveting die body, and the roughness of the bottom face of the cavity is larger than that of the top face of the riveting die body. The roughness of the bottom face of the cavity is set to be larger than that of the top face of the riveting die body, in the riveting process, materials of a low-ductility casting can enter the cavity, due to the fact that the roughness of the bottom face of the cavity is large, the material fluidity of the low-ductility casting can be reduced, and therefore the problem of riveting buckle cracks is effectively reduced or even completely eliminated.

The invention discloses alkali-activated foam concrete as well as a preparation method and application thereof, and relates to the technical field of building materials. The alkali-activated foam concrete is prepared from the following raw materials in parts by mass: 45 to 70 parts of mineral powder, 1 to 3 parts of first alkali activator, 8 to 15 parts of second alkali activator, 5 to 10 parts of alkali sealing treatment agent, 0.5 to 1.0 part of fiber, 15 to 30 parts of water, 0.5 to 2.0 parts of foaming agent, 0.1 to 0.5 part of foam stabilizer and 0.1 to 0.5 part of water reducing agent. According to the technical scheme, ordinary Portland cement and special cement are replaced with mineral powder, the lightweight and high-strength foam concrete material is prepared according to the alkali excitation principle, the cracking phenomenon of foam concrete can be relieved and eliminated, the stability of the slope surface can be improved, and by means of the mixed alkali activator, the alkali sealing treatment agent and the low-alkali-amount formula, the slope surface is more stable. The alkalinity of the foamed concrete can be reduced, and the survival rate of slope plant cultivation can be improved, so that the problem that different plants are difficult to grow on the slope can be solved.

The utility model discloses a glass tempering front side edge grinding device which comprises a roller frame, a plurality of conveying rollers are evenly and rotatably arranged on the roller frame, glass moves on the conveying rollers before being tempered, a plurality of sets of installation grooves are evenly and symmetrically formed in the roller frame, the installation grooves and the conveying rollers are arranged in a staggered mode, and the conveying rollers are arranged in the installation grooves. A grinding mechanism and a cleaning mechanism are arranged on the mounting groove and are sequentially arranged in the glass conveying direction, and a dust removal mechanism is further arranged on the roller frame. The side edges of the glass before tempering are polished through the polishing mechanisms symmetrically arranged on the two sides of the conveying rollers, cracks on the edges of the glass can be eliminated, the conditions of edge breakage, breakage and even furnace explosion in the tempering process are avoided, the finished product rate of tempered glass is increased, and production safety is guaranteed.

What is proposed is a method for protecting cathode blocks of aluminium electrolyzers having prebaked anodes, the method comprising providing a mixture of a refractory material with a binder, applying said mixture as a coating on the surface of the cathode blocks giving consideration to the cell bottom wear profile, and drying said coating. As the refractory material, use is made of a bimodal or polymodal mixture of titanium diboride powders or titanium diboride powder, the granulometric composition of which has a bimodal or polymodal particle size distribution. As the binder, use is made of sulfonated reaction products of naphthalene with formaldehyde having a coke residue of at least 30% by weight; after drying, a layer of graphite powder is applied to the coating surface as protection against oxidizing during commissioning, thus forming, upon heating of the cell bottom, an aluminium-wettable TiB2-C composite coating.

The application discloses a titanium carbide and element powder modification method for 5-series aluminum alloy and an aluminum alloy composite material, and aims to solve the technical problems that in the existing additive manufacturing, due to the high content of Mg element in the 5-series aluminum alloy, the additive manufacturing is difficult, and the aluminum alloy composite material obtained by additive manufacturing has crack defects and poor densification effect due to thermal cracks and evaporation of strengthening elements. The modification method comprises the following steps: obtaining 5-series aluminum alloy powder; adding titanium carbide particles and element powder to the 5-series aluminum alloy powder for mixing to obtain mixed powder; after heat preservation treatment of the mixed powder, the composite powder with small particle size is collected through screening; and the composite powder is formed by additive manufacturing, so that the modification of the 5-series aluminum alloy is completed, and the aluminum alloy composite material is obtained. The technical scheme of the application is used for providing a titanium carbide and element powder modification method for 5-series aluminum alloy and an aluminum alloy composite material.

The application discloses a kind of multi-layer board-daily ceramic board strip tray automatic felt production process.The technical scheme of the application includes: large-area wooden multi-layer plywood (such as area 1.22m*1.22m and 2.44m*1.22m, etc.) is placed on automatic glue spreader, and cold pressure glue with thickness of 0.1-0.2mm is uniformly applied on single side; the same size felt piece is automatically laid on the glue-coated surface by using a mechanical tension hand system equipped with 6 independent clamping points; 0.5-1.0MPa segmented rolling is carried out by 8 groups of rotating columns to form a preliminary felt board; 90 preliminary felt boards are cold-pressed for about 6 hours under 5 or so standard atmospheric pressure to completely solidify; and finally, the required size strips are divided by an electric saw cutting platform. The application significantly improves production efficiency by about 20 times, reduces labor cost from 2.5-3 yuan per strip to 0.3 yuan, achieves 95% or more uniformity of glue application, stabilizes product quality, completely eliminates felt separation and cracking problems, significantly improves the protection effect of ceramic body, and provides an efficient and economical technical solution for the automation transformation of the ceramic industry.

The invention discloses a composite anchoring structure and an anchoring method of a wind power mixed tower, the composite anchoring structure comprises a mixed tower body, the lower part of the mixed tower body is a concrete tower tube section, and the composite anchoring structure further comprises a concrete foundation buried under the earth surface and used for bearing the mixed tower body; the external pre-stressed anchoring assembly comprises a pre-stressed cable and an anchor base, the upper end of the pre-stressed cable is connected with the mixed tower body, the lower end of the pre-stressed cable extends to the outer side of the concrete foundation and is anchored to the upper portion of the outer side wall of the concrete foundation through the anchor base, and an anchoring point is higher than the ground surface; the built-in pre-stressed anchor bolt assembly comprises a pre-stressed anchor bolt, an upper anchor plate and a lower anchor plate, the upper anchor plate is pre-embedded in the top of the concrete foundation and fixedly connected with the bottom of the concrete tower drum section, the lower anchor plate is pre-embedded in the lower portion of the interior of the concrete foundation, the pre-stressed anchor bolt penetrates through the concrete foundation, and the two ends of the pre-stressed anchor bolt are fixedly connected with the upper anchor plate and the lower anchor plate correspondingly; prestress is applied to the concrete foundation, and the concrete tower drum section is anchored on the concrete foundation. The problems that a traditional anchoring structure is inconvenient to construct, difficult to overhaul and prone to cracking and water seepage are solved.

The invention relates to the technical field of road engineering, and discloses a settlement section roadbed and pavement construction process in municipal road engineering, which comprises the following steps: S1, preparing construction materials; s2, performing pavement layer construction; s3, stone layer construction is conducted; and S4, foundation treatment is conducted. According to the settlement section roadbed and pavement construction process in the municipal road engineering, through structure optimization, loess collapsibility and foundation deformation are effectively reduced, through improvement of foundation materials, original loess collapsibility and non-deformability of the original loess collapsibility are further improved, a wireless communication technology Lora is used, and the settlement section roadbed and pavement construction process has the advantages that the settlement section roadbed and pavement construction process is simple, convenient and practical. A plurality of sensors are connected into a network by using a spread spectrum technology in which communication at different transmission rates does not interfere with each other, real-time acquisition and transmission of data are realized, and the data are transmitted to a data center or a cloud platform, so that constructors can find and solve problems in time through the data, and the construction efficiency is improved. Errors caused by lack of real-time monitoring in the actual working process are avoided.

The invention discloses a method for manufacturing ODS steel through electric arc additive manufacturing. The method comprises the steps that firstly, after a substrate is subjected to surface cleaning treatment, a layer of steel is deposited with an electric arc as a heat source; then coating oxide particles on the surface; an electric arc is used as a heat source for scanning with the surface of the coating and naturally cooling, so that the single-point molten pool is overlapped with the surrounding adjacent molten pools to form a continuous molten pool; and finally, carrying out stirring friction processing and hot rolling treatment. Near-net forming of the prepared part is completed through layer-by-layer accumulation in a deposition-coating-deposition-stirring machining-hot rolling machining mode, and finally the alloy material with good forming quality and fine and dispersed internal oxide particles is obtained.

The utility model relates to the technical field of cement mortar testing equipment, and discloses a jolt ramming table for a cement mortar test, which comprises a test bed, and a first motor is inserted in the left side of the interior of the test bed; the transmission block is inserted into the right side of the interior of the test bed, springs are connected to the left side and the right side of the transmission block, a cam is coaxially connected to a rotor of the first motor, a driving arm is connected to the outer side of the front portion of the cam through a bearing, a bearing plate is connected to the top end of a connecting block, and a vibration table is installed in the middle of the upper surface of the bearing plate. According to the compaction table for the cement mortar test, a first motor drives a cam to rotate, so that a driving arm can drive a transmission block to move left and right, the vibration table can synchronously move left and right when driving a mold on the surface of the vibration table to vibrate, cement mortar can be helped to better fill all corners of the mold, bubbles and gaps are reduced, and the compaction efficiency is improved. Therefore, the compactness of the sample is improved.

The present invention discloses a compact microchannel LNG heat exchanger and a preparation method thereof. The heat exchanger includes a heat exchanger body, and a plurality of cold fluid channels and hot fluid channels are arranged alternately and at intervals in the vertical direction. The two ends of the cold fluid channel are respectively connected to the cold fluid inlet and the cold fluid outlet, and the two ends of the hot fluid channel are respectively connected to the hot fluid inlet and the hot fluid outlet. The cold fluid channel includes a first diverter channel, a cold side heat exchange channel and a first confluence channel. The hot fluid channel includes a second diverter channel, a heat measurement heat exchange channel and a second confluence channel. The present invention adopts a countercurrent arrangement, and a large temperature difference stress is not generated at both ends of the heat exchanger. Diverter and confluence channel sections are respectively arranged after the fluid inlet and before the fluid outlet. The fluid flows through the diverter channel, and the diverter channel makes the flow distribution more uniform, so that the medium temperature is evenly distributed. The preparation method adopts additive manufacturing technology for one-piece molding, and the material utilization rate is high, which ensures the stability and efficiency of the heat exchanger operation.

The utility model discloses a compensation device for thermal expansion amount of hot air ducts of a lithium mineral roasting rotary kiln, which is arranged between a first hot air duct and a second hot air duct which are discontinuous and adjacent, and comprises a corrugated pipe, the two ends of the corrugated pipe are fixedly connected with the ends, close to each other, of the first hot air duct and the second hot air duct. A guide plate is arranged on the inner side of the corrugated pipe; and striker plates are arranged between one end of the corrugated pipe and the inner side of the first hot air duct and between the other end of the corrugated pipe and the inner side of the second hot air duct. According to the utility model, the corrugated pipe wrinkles extend along the folding direction, and the thermal expansion amount of the hot air duct formed by the first hot air duct and the second hot air duct can be compensated, so that the phenomenon that cracks are generated in the weld joints of the hot air duct due to inconsistent thermal expansion amounts of the barrel body and the hot air duct of the lithium mineral roasting acidification rotary kiln can be avoided.

The present application belongs to the field of computer-aided design, and particularly to a computer-aided design system for supporting a white model of an agricultural machine box. The system constructs a three-dimensional geometric model of the white model of the agricultural machine box and extracts the elastic modulus and yield limit parameters; establishes a discrete element model of the sand and a kinematics equation of the vibration table to simulate the sand filling and vibrating process, and obtains the distribution of the dynamic fluid-structure coupling pressure field of the white model surface; takes the dynamic pressure field distribution as the external load boundary condition, takes the maximum deformation of the white model being less than the yield critical value as the constraint, and takes the minimum volume of the support structure as the target to solve the density distribution of the support material; in combination with the support cross-section size requirement of the white model casting process, the density distribution is subjected to threshold extraction and geometric reconstruction to generate a non-uniform support structure that is fitted to the white model surface and adapts to the vibration pressure. The support distribution is matched with the dynamic pressure field, the local deformation and rupture of the white model are eliminated, the support redundancy is avoided, and the structural stability is improved.

The preparation method comprises the following steps: 1) dissolving polycarbosilane powder and metal oligomer powder, carrying out high-temperature reflux, distillation and high-temperature crosslinking to obtain a solid, grinding the solid, dissolving the ground solid in an organic solvent to obtain a modified polycarbosilane solution, and dropwise adding a platinum catalyst; adding a silane coupling agent into the graphene oxide dispersion liquid, mixing into the modified polycarbosilane solution, heating, stirring, carrying out rotary evaporation, and grinding to obtain SiC ceramic precursor powder; 2) mixing PVG powder and metal oligomer powder in an organic solvent, performing high-temperature reflux, distillation, high-temperature crosslinking and grinding, and finally performing high-temperature cracking to obtain SiC ceramic filler powder; and 3) carrying out ball milling, tabletting, demolding and high-temperature sintering on the SiC ceramic precursor powder, the SiC ceramic filler powder and the boron powder to obtain the authigenic ultrahigh-temperature ceramic reinforced silicon carbide composite material which is low in density, high in mechanical strength, high-temperature-resistant, antioxidant and capable of being made into complex shapes.

The invention discloses a device and method for eliminating linear squamous folding defects on the surface of hot-rolled stainless steel. The method comprises the steps of surface cleaning, surface coping, heating and descaling. The device comprises a grinding box, a descaling box, a cleaning device, a grinding device, a recycling device and a dephosphorization device. The two cleaning devices and the two polishing devices are symmetrically arranged in the polishing box, and a cleaning door I is arranged at the bottom of the polishing box. The recovery device is fixedly connected with the polishing device slidably connected in the mounting groove I; one group of dephosphorization devices is positioned above the conveying rollers and is fixedly connected with a descaling box of which one side is fixedly connected with a supporting table I and a supporting table II, the other group of dephosphorization devices is positioned among the plurality of conveying rollers and is fixedly connected with the descaling box, an exhaust pipeline is arranged at the top of the descaling box, and a cleaning door II is arranged at the bottom of the descaling box. According to the method, deep treatment is conducted on the unheated steel billet, and meanwhile the phenomenon that the transverse temperature of the same position of the heated steel billet is not uniform in the descaling process can be prevented.

The invention belongs to the technical field of building materials, and particularly relates to an autoclaved lightweight concrete plate which comprises a concrete body and a framework. The concrete body comprises cement, steel fiber, expanded clay and the like. The framework comprises a left end plate, a right end plate, a plurality of connecting ribs, a plurality of connected blocks and a plurality of connecting pieces. A connected block is fixed in the through hole of the left end plate, the outer end faces of the connected block and the left end plate are flush, and a cavity port formed in the connected block faces outwards. A slotted hole structure is formed in the right end plate, a port of the slotted hole structure faces the outer side and is fixedly provided with an upper connecting piece, and a U-shaped arm on the connecting piece extends outwards. The left end plate and the right end plate are connected into a whole through a plurality of connecting ribs; the U-shaped arm on the connecting piece can be connected with the cavity in the connected block in an inserted mode. According to the invention, by improving the framework and adaptively adjusting the components and the proportion, the condition of cracking after a wall is built by the plates can be effectively inhibited, and the building quality of the wall is improved.

The anti-cracking manufacturing method of the hexahedron based on the punching process has been deeply studied in view of the punching deformation, precision tolerance and a large number of hexahedron cracks that occur in actual production. The method of increasing the diameter of the prefabricated bottom hole is used to reduce the back cutting amount, which can greatly reduce the cutting force, thereby solving the problems of punching deformation and precision tolerance; increasing the prefabricated bottom hole can reduce the cutting force and ensure the use requirements and its own strength, while dispersing the circumferential prestress during punching, and at the same time controlling the heat treatment hardness of the parts and using a dehydrogenation process, eliminating the cracking problem caused by the superposition of stress corrosion and hydrogen embrittlement.