50results about How to "Improve flexural strength" patented technology

The invention discloses a fiber foamed concrete and a preparation method thereof. The fiber foamed concrete comprises the following raw materials in parts by weight: 5290 parts of cement, 4965 parts of water, 1.361 part of foaming solution, 1.2964 part of fly ash and 10 parts of fiber. The preparation method comprises the following steps: proportionally weighing the components; sequentially adding the cement and fly ash into a stirrer, proportionally weighing the water, uniformly stirring the mixture by the stirrer, and adding the fiber; preparing and adding the foaming solution; gradually adding the foam into the mixture, and continuously stirring until all the components are uniformly mixed; pouring the mixture into a mold on which lubricating oil is brushed, and curing in a curing chamber; after 24 hours, removing the mold; and respectively curing for 3 days, 7 days and 28 days for experimental detection. The fiber foamed concrete has the advantages of favorable thermal insulation property, favorable compression resistance and favorable bending resistance, and is applicable to a railway bed strengthening layer.

This invention discloses a high-density, high-thermal-conductivity hot-pressed aluminum nitride substrate and its preparation method, belonging to the field of ceramic thermally conductive materials technology. The aluminum nitride substrate is composed of aluminum nitride powder and a composite sintering aid, the composite sintering aid being a fluoride, with a total addition amount of 2%-8% of the aluminum nitride powder mass. The aluminum nitride substrate has a multi-layer composite structure, including an upper dense layer, a middle stress buffer layer, and a lower dense layer. The porosity of the upper and lower dense layers is ≤0.3%, and the porosity of the middle stress buffer layer is 1%-5%. The preparation method includes steps such as raw material mixing, multi-layer molding, hot-pressing sintering, and diamond wire saw cutting. This invention achieves grain boundary purification through a pure fluoride composite aid system, combined with a multi-layer structure design to absorb cutting stress and thermal stress, resulting in a substrate density ≥99.5%, thermal conductivity ≥240W / (mK), and an ultra-thin substrate edge chipping rate ≤3%, while simultaneously reducing the sintering temperature and shortening the production cycle.

The utility model provides a comfortable back -carrying type hair dryer with damping structure, include: hair dryer body, hair dryer body one side is equipped with backplate support, backplate support one side fixed mounting has damping component, and damping component includes U shaped elastic sheet, and U shaped elastic sheet fixed mounting is in backplate support one side, and U shaped elastic sheet one side surface is equipped with two empty grooves, and two empty grooves are all respectively pasted with silica gel block in, and silica gel block one side is respectively pasted with soft cotton board. When the user carries the hair dryer body through the shoulder strap, the body pressure is passed to the silica gel block through the soft cotton board, and the high elasticity deformation of silica gel absorbs high frequency fine vibration, and the wave plate is located between two soft cotton boards, and the wave structure of the wave plate produces deformation when being pressed, and the dispersion pressure increases the buffer stroke, improves the comfort degree when the user is carrying.

This invention provides a multi-scale corn stalk cellulose-reinforced cementitious material and its preparation method. The multi-scale corn stalk cellulose-reinforced cementitious material comprises multi-scale corn stalk cellulose and cement. The multi-scale corn stalk cellulose has both micron-fiber and nanofiber structures. The micron-fibers have a diameter of 1-5 μm and a length of 500-3000 μm, and the nanofiber structures are mainly distributed on the surface of the micron-fiber structures, with a diameter of 1-5 nm and a length of 100-2000 nm. The multi-scale corn stalk cellulose-reinforced cementitious material provided by this application exhibits higher flexural and compressive strengths (10-30% increase) than the control group cement, and has broad application prospects in the field of construction engineering.

The application provides an electric heating device for a strip steel heat treatment furnace, which comprises an electric heating radiation tube mechanism and an atmosphere protection cover mechanism, the electric heating radiation tube mechanism is horizontally suspended in the strip steel heat treatment furnace, one end of the electric heating radiation tube mechanism is fixed on a side wall of the strip steel heat treatment furnace, the end of the electric heating radiation tube mechanism is exposed to the strip steel heat treatment furnace, and the other end of the electric heating radiation tube mechanism extends into the strip steel heat treatment furnace, and the atmosphere protection cover mechanism covers the end of the electric heating radiation tube mechanism connected with the strip steel heat treatment furnace and is fixed on the wall of the strip steel heat treatment furnace, the electric heating device has the advantages of low cost, high temperature control precision, good energy-saving effect, long service life and low maintenance cost.

The utility model relates to a kind of high trapezoidal multi-hole high cavity reinforced structure wall pipe, including pipeline main body, reinforcing rib is formed with spiral winding in pipeline main body outer end face, it is hollow, and cross-sectional shape is set to trapezoidal;Reinforcing rib outer end face spiral winding is formed with reinforcing pipe, reinforcing pipe is hollow tubular structure, its cross-sectional shape is circular, the outer diameter of reinforcing pipe is not greater than the maximum width of reinforcing rib;Reinforcing frame is arranged in the cavity of reinforcing rib, and it is tightly arranged with the inner wall of reinforcing rib, corrugated pipe is arranged in reinforcing pipe, and it is tightly arranged with the inner wall of reinforcing pipe.Compared with the defect that existing circular reinforcing rib is prone to depression, cracking under asymmetric load, the structure wall pipe is designed through trapezoidal cross-section reinforcing rib, utilizes the advantage that trapezoidal structure stress dispersion is uniform, lateral pressure resistance is strong, efficiently transfers external force such as soil pressure, ground load to pipeline main body, avoids local stress concentration.

This invention discloses a high-performance vitrified microsphere composite polystyrene particle insulation board and its preparation method, comprising the following steps: premixing hydrophobic vitrified microspheres and expandable polystyrene particles coated with expanded graphite at a mass ratio of (2.5~4):1 to obtain composite lightweight aggregate. The insulation board prepared by this invention, with a dry density of only 184-193 kg / m³, exhibits a compressive strength as high as 0.275-0.302 MPa, significantly superior to traditional inorganic insulation boards (0.15-0.25 MPa) and organic insulation boards (0.10-0.15 MPa); its thermal conductivity is as low as 0.034-0.041 W / (m·K), and its insulation efficiency is more than 40% higher than that of traditional inorganic materials, while also possessing Class A fire safety performance; furthermore, the process is simple and controllable, with an industrial solid waste utilization rate of up to 70%, demonstrating significant economic benefits and environmental value, and possessing broad prospects for widespread application.

The utility model discloses an asymmetric non -middle wall connected arch tunnel support system relates to tunnel support technical field, including connected arch tunnel first -pass hole initial support, connected arch tunnel first -pass hole initial support includes I20a type steel arch frame, inside phi 8 steel bar net, outside phi 8 steel bar net, steel arch frame connecting reinforcing steel bar, big arch foot reinforcing cage, big arch foot steel arch frame triangle bracing structure, big arch foot steel arch frame connecting steel sheet and stiffened steel plate, through the first -pass hole initial support of setting, first -pass hole initial support adopts I20a type steel arch frame, inside phi 8 steel bar net, outside phi 8 steel bar net, steel arch frame connecting reinforcing steel bar, big arch foot reinforcing cage, big arch foot steel arch frame triangle bracing structure, connecting steel plate and stiffened steel plate, form high -strength, high rigid support system, effectively disperses the surrounding rock pressure, reduces local damage, and system anchor rod and radial injection grouting small catheter consolidate surrounding rock through injection grouting, further enhances the stability of surrounding rock.

The utility model discloses a kind of beams of gantry milling, including beam, the beam has hollow cavity, the inner wall of the beam is fixedly connected with multiple annular reinforcing plates at equal intervals, the inner wall of the beam is fixedly connected with multiple reinforcing plates, each the reinforcing plate is fixedly connected with each annular reinforcing plate, the inner wall of the beam is fixedly connected with multiple reinforcing pieces, each the reinforcing piece is fixedly connected with annular reinforcing plate, the bottom of the beam is fixedly connected with two mounting blocks, the bottom of the beam is equipped with two vertical beams, assembly mechanism is equipped between the beam and vertical beam. The utility model is by being provided with equal interval annular reinforcing plate in the beam hollow inner wall, cooperate with the reinforcing plate fixedly connected with it, form support structure, effectively enhance the torsional stiffness and bending strength of beam;Reinforcing piece and annular reinforcing plate fixedly connected that the beam inner wall is provided with, can effectively disperse stress concentration, prolong equipment service life.

The utility model discloses a kind of lightweight high-strength cabinet main body support section bar, belong to cabinet section bar technical field, its technical scheme main point includes crossbeam, column and steel tee, the steel tee is set in the connecting place of crossbeam and column, by the first section bar main plate of crossbeam and column, second section bar main plate adopts W shape outer contour, by bending process forms wave shape cross section, when bearing perpendicular load, W shape structure will force be dispersed to each bending part, reduce single-point stress concentration, steel tee is welded after inserting with crossbeam, column by connecting protrusion, the elastic deformation ability of W shape outer contour and bending part relieves welding thermal stress, improve the fatigue resistance of connecting position, compared with traditional solid rectangular steel pipe, so that the weight of cabinet section bar can be reduced, while the bending strength is greatly improved, meet the urgent needs of industrial electrical integration to cabinet lightweight, improve protection level and multi-cabinet combination and other aspects.

This invention belongs to the field of engineered wood products manufacturing, specifically a method for preparing low-formaldehyde finger-jointed boards based on bio-based modified adhesives. The method includes preparing an adhesive composed of modified soybean protein, non-formaldehyde crosslinking agents, micro / nano cellulose, nano-silica, and epoxidized vegetable oil elastomers; pre-treating the wood and cutting the finger joints; applying a sealing liquid via atomization for end-face damping treatment; performing quantitative adhesive application and stepped butt joint molding; and employing a multi-stage hot-pressing process involving preheating penetration, high-temperature curing, and cooling and pressure holding. Through the above technical solution, this application can achieve the formation of a dense adhesive film at the finger joint interface, significantly improving bonding strength and stability while reducing formaldehyde release.

This invention provides a method for preparing a mixed-grain cold heading die material and the mixed-grain cold heading die material itself. The method involves mixing two types of powders with different grain sizes—WC powder, Co powder, and Cr2C3 powder—with paraffin wax. The mixture is then subjected to wet milling in a ball mill, drying and sieving, pressing, dewaxing and pressure sintering, and rapid cooling to obtain a high-performance mixed-grain cold heading die material. This preparation method is simple, requires no special equipment, has low production costs, and has broad application prospects.

The present application relates to the technical field of aerated concrete preparation, and particularly relates to a method for preparing electrically conductive aerated concrete by using porous carbonized recycled aggregate and the aerated concrete. The process method first places pre-wetted recycled aggregate in a pressurized carbonization kettle, and industrial waste gas with CO2 concentration greater than or equal to 20% is introduced to react for 2-3 hours at 0.5-0.7 MPa and 60-70 DEG C to produce porous carbonized recycled aggregate. Then the porous carbonized recycled aggregate is dry-mixed with gel material, gypsum, conductive carbon black and reinforcing fibers, and then mixing water containing water reducing agent (water aggregate ratio 55-60%) is added to stir into base mortar. Then aluminum paste suspension is added to the mortar, and after stirring to start aeration, the mortar is poured into a mold. After 2-3 hours of static aeration, the mold is finally autoclaved and dried for 6-8 hours to obtain the electrically conductive aerated concrete. Through aggregate pretreatment strengthening, orderly dispersion of the conductive phase and hierarchical curing control, the present application can effectively solve the contradiction between light weight, high strength, electrical conductivity and durability, and provide a multifunctional green building material solution for airport construction.

The present application relates to the technical field of high polymer composite material, and especially to a co-extrusion fabric, a preparation method and application thereof, and is especially suitable for the field of steel-plastic composite floor which is strict in size stability and mechanical property requirement, such as building decoration, industrial floor, outdoor paving, etc., the co-extrusion fabric comprises the following raw material components in parts by weight: polyethylene: 40-70 parts; elastomer: 20-50 parts; compatibilizer: 3-10 parts; inorganic mineral: 5-10 parts; antioxidant: 0.1-1 part; lubricant: 0.5-1 part; a low-shrinkage, anti-warping polyethylene composite zinc-aluminum-magnesium alloy steel-plastic floor co-extrusion fabric is provided, by optimizing the raw material ratio, selecting special compatibilizer and inorganic mineral filler, the efficient compatibility of polyethylene, elastomer and inorganic filler is realized, the polyethylene crystalline morphology is controlled, the material shrinkage is greatly reduced, the hidden danger of warping deformation is eliminated, and the mechanical strength, toughness and weather resistance of the material are improved.

The application relates to the technical field of medical devices, in particular to a catheter pump assembly and a processing method thereof. The catheter pump assembly comprises a blood flow channel, a blood inflow cage and a blood outflow cage. The blood flow channel comprises a spring body support which is coiled by a shape memory alloy wire. The inner side of the spring body support is covered with an inner layer film, and the outer side is covered with an outer layer film. The two ends of the inner layer film and the outer layer film respectively extend to the two ends close to the spring body support, so that at least part of the spring body support is located at the connecting part of the blood flow channel, the blood inflow cage and the blood outflow cage. According to the technical scheme provided by the application, the connecting part of at least part of the blood flow channel, the blood inflow cage and the blood outflow cage is supported by the spring body support, thereby improving the bending resistance of the connecting part of the blood inflow cage, the blood outflow cage and the blood flow channel, overcoming the risk of breakage or falling of the connecting part, and ensuring the reliability of the catheter pump in use.

This invention discloses a door anti-collision device based on shape memory alloy, belonging to the field of vehicle safety protection technology. The device includes a shape memory alloy anti-collision beam body, a triggering system, a heating unit, and an auxiliary energy-absorbing layer. The anti-collision beam body is made of nickel-titanium shape memory alloy material, with deformation guide grooves on its surface to limit the controlled deformation path and improve energy absorption efficiency. The triggering system consists of an inner door pressure sensor, a side millimeter-wave radar, and a surround-view camera, used to monitor the environment around the door in real time and transmit signals to the electronic control unit. This door anti-collision device improves the safety of side collisions, solves the problems of low energy absorption efficiency of existing door anti-collision beams in high-speed side collisions and performance degradation after repeated collisions, while meeting the requirements of vehicle lightweighting.

The utility model provides a kind of shell dismantling tool with fixed structure and anti- indentation contact surface, it is related to semiconductor device processing equipment technical field, the shell dismantling tool includes tool upper cover, tool base and press equipment connecting mechanism;Tool upper cover bottom is provided with rectangular boss and rectangular contact surface, rectangular contact surface is contacted with product copper bottom plate surface;Tool base surface is equipped with the positioning cylinder array matched with product bushing, and positioning cylinder array includes at least four convex positioning columns;Press equipment connecting mechanism includes the first threaded hole group being set in tool upper cover top and the second threaded hole group of tool base bottom, and first threaded hole group and second threaded hole group are respectively connected with press equipment executing mechanism rigidly by upper cover peg and base peg;Buffer pad is also provided on the working surface of tool base, is fixed by dovetail groove connecting structure, solves product copper bottom plate scratch, product DBC broken horn, and the problem that copper bottom plate is difficult to take from press tool inside.

The invention discloses a zirconia ceramic matrix with high thermal shock resistance as well as a preparation method and application thereof. The zirconia ceramic matrix comprises a matrix and a coating layer a; the matrix comprises the following components: 90-98 wt% of zirconium oxide; 1.5 to 8 wt.% of a stabilizing agent; % of a grain boundary regulating agent; the stabilizing agent is prepared from the following components in percentage by weight: 2.0 to 4.0 percent of Sc2O3, 0.5 to 1.5 percent of Yb2O3 and 0.3 to 1.0 percent of Er2O3; the grain boundary regulating agent is a composition of a boron source and an aluminum source; in the coating layer a, the molar ratio of zirconium to aluminum is (2-3): 1; and the component 1 is polyvinyl alcohol or polyvinylpyrrolidone. The fracture toughness, bending strength and thermal shock resistance of the ceramic matrix are effectively improved, and the overall mechanical property is remarkably improved. When the material bears thermal shock, the thermal shock resistance of the material is improved, and the application scene of the zirconia ceramic material is expanded.

The application relates to the technical field of semiconductor equipment, and provides a carbon-carbon composite bearing plate for PECVD film coating, which comprises a surface layer, an intermediate layer and a supporting layer connected in sequence, the surface layer adopts a nano-carbon tube reinforced carbon-based composite material, the surface of the surface layer is subjected to chemical vapor deposition densification treatment, and the roughness Ra is less than or equal to 0.1 micrometers; the intermediate layer is a porous graphite structure with a porosity of 30-40%; and the supporting layer is a carbon fiber three-dimensional woven framework which is combined with the intermediate layer through interface diffusion. The application has the effect of improving the high-temperature resistance, corrosion resistance and low-thermal expansion coefficient of the bearing plate.

The utility model belongs to the technical field of step connection structure, especially convenient installation maintenance's escalator step connection structure, including step board and transmission shaft, the inside of step board is respectively worn and is equipped with transmission shaft and guide column, one side symmetry of step board is installed with connecting plate and butt joint board, the side close to step board of connecting plate and butt joint board is equipped with the reinforcing rib that installs fixedly, the both ends of connecting plate one side are fixedly connected with swallow -tailed thin piece, the middle part of connecting plate one side is equipped with the thick piece draw -in groove, the both ends of butt joint board one side all are equipped with thin piece butt joint groove, the middle part of butt joint board one side is fixed with swallow -tailed thick piece, through swallow -tailed groove clamping mechanism, realize the quick sliding -in type assembly of connecting plate and butt joint board, maintenance time reduces, and swallow -tailed thick piece and through slot draw -in groove form mechanical interlock, even if bolt failure still can keep frame integrity, radial reinforcing rib makes connecting plate bending strength promotion.

The application discloses modified sodium carboxymethyl cellulose for concrete, which has grafting segments of hydrophilic carboxylic acid groups and strong polar nitrile groups, and a crosslinked three-dimensional network structure; carboxylic acid groups and nitrile groups and crosslinking groups are introduced at the same time, the introduced carboxylic acid groups make the CMC-Na have more excellent water solubility, faster dissolution speed and higher production efficiency; and provide strong hydrogen bond action, stronger intermolecular force, more difficult intermolecular movement and improved viscosity; have more excellent water absorption and water retention; the introduced nitrile groups endow the modified CMC-Na with strong polarity, form hydrogen bonds and covalent bonds with silicates in the concrete, and greatly improve the bonding strength; meanwhile, the introduction of nitrile groups endows traditional CMC-Na with flexibility, can fill pores and other problems during concrete mixing, and makes the concrete structure more compact; the addition of a crosslinking agent makes the density of carboxylic acid and nitrile groups significantly increase, forms a network structure, and improves the density of steric hindrance and hydrogen bonds.

The utility model discloses rail transit bridge engineering field, specifically discloses a kind of closed sound barrier mounting structure of existing rail transit bridge deck, including the multiple sound barrier column foundation being set apart in the approach bridge flange plate edge place in line direction and the bridge deck reinforcing layer being set up and extending in bridge deck inside in the approach bridge flange plate edge place above bridge deck along;Sound barrier column foundation upper end surface is embedded with embedded steel plate, and several vertical downward vertical orifices are opened in the vertical orifice from embedded steel plate upper end to bridge flange plate lower end, and bridge flange plate bottom surface is provided with lower anchoring steel plate, and lower anchoring steel plate is provided with mounting hole on it;Through the vertical orifice of embedded steel plate, sound barrier column foundation, bridge flange plate and the mounting hole of lower anchoring steel plate by high-strength bolt, sound barrier column foundation and bridge flange plate are connected together to form structural whole.The utility model can install closed sound barrier in existing rail transit bridge deck later period, and it is simple, reasonable in structure, and widely applicable.

This invention discloses a method for preparing paperless boards from modified industrial by-product gypsum, relating to the field of building board technology. The method includes a fluidized bed furnace, with a mixer at one end, a forming device at one end of the mixer, and a primary drying device at one end of the forming device. The primary drying device contains a conveyor belt assembly, with a tilting clamp at one end of the conveyor belt assembly. A support base is located below one side of the tilting clamp, and a chain drive assembly is mounted on top of the support base. This invention, through a series of structural features, ensures more uniform heating on both sides of the board, more rational airflow organization, and improved drying efficiency and quality. It effectively avoids defects such as board deformation and warping caused by uneven heating in traditional horizontal drying methods, reduces interfacial porosity, significantly improves board durability, optimizes material flow paths, and reduces equipment footprint.

The utility model relates to the field of pipeline support, especially a new type is used for heavy pipeline of pump group split type pipeline support, including bottom support, top support, middle support, top support is provided with in the bottom support upside, it is connected with middle support installation between the bottom support and top support through the middle support. The utility model discloses pipeline support mainly by bottom support, top support, middle support are composed, such split design, and make through square tube and steel plate, can effectively solve the problem that existing pipeline support exists in the support, vibration control and flexibility etc.

A portable drilling measuring instrument comprises a receiving rod, a mobile power source is arranged on the outer surface of one side of the receiving rod, the outer surface of the receiving rod and the same side of the mobile power source are connected with a wireless range finder in a magnetic attraction mode, the wireless range finder is provided with a panel and a laser lamp, and the light emitting direction of the laser lamp is parallel to the center line of the receiving rod. A fixed seat is arranged on the outer surface of the other side of the receiving rod, and an inclinometer is arranged on the fixed seat; a lighting camera, an inclinometer and an infrared distance meter are integrated, through modular combination of the measuring end, the measuring rod and the receiving end, measurement of parameters such as the drilling depth and the inclination angle can be completed at a time, real-time visual detection of the rock condition in a hole is synchronously achieved, and compared with a traditional single measuring mode, the working efficiency is improved, the personnel requirement is reduced, and the cost is reduced. The whole set of equipment is light in weight, easy to carry and suitable for rapid measurement of multiple scenes such as tunnels and mines.

This invention discloses an upward-rotating and downward-rotating spray gun, belonging to the field of agricultural irrigation technology. Based on the original double-rotating spray gun, this invention is optimized for high-sediment-content water environments. It includes: an outer cylinder (1), a central water supply pipe (2), a drive rotating shaft (3), a planetary reduction mechanism (4), a high-speed recoil drive arm (5), and a low-speed spraying arm (6). The improvements are as follows: the base (7) is provided with first and second sealing rings (701, 702) to isolate sand and dust; the upper end face of the base and the central groove are provided with sand discharge holes (703); the lower end of the first water distribution chamber (501) is provided with a double sealing ring layer (504), and the high-speed recoil drive arm at the corresponding position is provided with a debris discharge hole (505); the top of the high-speed recoil drive arm is provided with a sealing thread sleeve (506) to cooperate with the upper sealing ring (507); the inner wall of the central water supply pipe (2) is provided with ribs (202) that have both reinforcement and flow guiding functions; the low-speed spray arm (6) consists of two bifurcated arms of different heights, with nozzles of different sizes installed at angles of 30-38° and 5-20° respectively to balance the reaction force. While maintaining the advantages of the original double swirl field, the present invention significantly improves the anti-clogging ability and operational balance, and is especially suitable for surface water irrigation with high sand content.

This invention relates to the field of wear-resistant component manufacturing technology for mining machinery, specifically disclosing a high-wear-resistant and impact-resistant cemented carbide jaw plate and its manufacturing method. The jaw plate's surface layer uses low-cobalt, fine-grained tungsten carbide with added grain growth inhibitors, while the bottom base uses medium-high cobalt, coarse-grained tungsten carbide, achieving a performance gradient of high wear resistance on the surface layer and high toughness and strength on the base. By controlling the forming agent and spray drying process to match the interlayer shrinkage coefficients, and combining hydraulic pressing and wet bag isostatic pressing secondary forming to eliminate density differences, along with segmented dewaxing, vacuum pressure sintering, and slow cooling, the interlayer sintering stress is effectively reduced. Finally, a two-stage stress-relief treatment involving liquid nitrogen gradient cryogenics and vacuum tempering eliminates internal material stress. The jaw plate obtained by this invention has a dense, defect-free interlayer bond, low residual stress, and excellent wear resistance and impact resistance, significantly improving its service life and reliability under high-purity silicon crushing conditions.

The utility model belongs to marble composite board field especially, it is a kind of multilayer co-extrusion weather-resistant organic artificial marble composite board, aiming at the spacing control difficulty of existing marble composite board: uneven gap when stone slab splicing, affect overall flatness and aesthetic property;Risk of thermal expansion and cold shrinkage: the problem of insufficient installation stability, present and propose the following scheme, including stone slab main part, the stone slab main part includes base plate, the upper layer resin plate of base plate top is sequentially laminated and bonded, lower layer resin plate, reinforcing plate and rubber plate, the second installation slot of accommodating lower layer resin plate, reinforcing plate and rubber plate is set in the upper layer resin plate bottom, in the utility model, when four stone slab main parts are spliced, connecting block realizes automatic alignment by mutual interference, ensure that gap is even;Connecting block thickness is much smaller than stone slab main part, after installation, the side connecting block can be quickly removed through easy-to-disassemble component (connecting broken groove, first strip broken groove, second strip broken groove), form reserved gap.

This invention provides a gradient silicon nitride ceramic femoral head prosthesis and its preparation method, relating to the technical fields of clinical medicine and biomaterials. The femoral head prosthesis is prepared from 88-94 parts of silicon nitride powder, 4-12 parts of sintering aid, 5-20 parts of tungsten carbide titanium, and 0-30 parts of pore-forming agent, wherein the pore-forming agent cannot be 0 parts. The gradient silicon nitride ceramic femoral head prosthesis of this invention retains the advantages of silicon nitride ceramics—low wear, low friction, high strength, high fracture toughness, and good chemical stability—at the interface between the femoral head prosthesis and the liner, while reducing wear on the titanium alloy femoral stem cone caused by the large hardness difference between the femoral head prosthesis and the liner. This reduces the incidence of organ toxicity, periprosthetic osteolysis, and aseptic loosening caused by metal wear debris, improves the survival rate of the femoral head prosthesis and the femoral stem cone, reduces the revision rate of replacement surgery, and saves patients' treatment costs.

The application provides a basalt powder and a basalt fiber reinforced anti-cracking mortar and a preparation method thereof, and belongs to the technical field of cement, concrete and other building materials. The application comprises components of Portland cement, basalt powder, graded sand, basalt fiber, latex powder, cellulose ether and water reducing agent. The application optimizes the compactness of the matrix by filling and reacting with the basalt powder and the pozzolanic ash, and forms a three-dimensional reinforcing network with strong interfacial bonding by using the basalt fiber which is subjected to surface etching and silane coupling treatment. The two components synergistically improve the crack resistance and toughness of the mortar, and the mortar shows a high ductility failure mode with multiple crackings. Meanwhile, the tensile strength, the bending strength and the compressive strength of the mortar are comprehensively enhanced, and the fracture energy is significantly improved. In addition, the high-density matrix and the corrosion-resistant fiber together endow the mortar with excellent impermeability, freeze-thaw resistance and corrosion resistance, and greatly prolong the service life.