280results about How to "Avoid microcracks" patented technology

The invention provides an expanded flexible well cementing grout and a preparation method thereof. The grout comprises the following components in parts by weight: 100 parts of cement, 6-14 parts of toughening material, 3-80 parts of reinforcing material, 8-120 parts of density modifier, 0.5-2.5 parts of suspension stabilizer, 20-40 parts of high-temperature stabilizer, 35-100 parts of distilled water, 0.5-2 parts of dispersant, 0.5-4 parts of fluid loss agent, 0.3-4 parts of retarder, 0.1-2 parts of foam inhibitor and 0.1-2 parts of defoamer. The invention further provides a preparation method of the expanded flexible well cementing grout. The grout has good sedimentation stability; and the set cement has the characteristics of micro expansion, high strength and low elasticity modulus, and can avoid the phenomena of micro cracks, micro annuluses, even fracture and the like caused by cement sheaths in subsequent operation of gas storage wells, shale gas wells, dense oil-gas horizontal wells and the like, thus realizing good zonal isolation and providing a technical support for long-term, safe and effective operation of oil-gas wells.

The invention discloses a preparation method of a sapphire-glass laminated sheet. The preparation method comprises the following steps: (1) injecting a He<+> ion layer on the surface of a sapphire material; (2) peeling the He<+> ion layer to obtain an ultrathin sapphire material with at least one damage-free and ultra-smooth face; (3) roasting and welding to obtain a laminated sheet with one damage-free face and the other glass face; and (4) processing. The preparation method disclosed by the invention has the beneficial effects that (1) the processing speed is relatively fast, a lot of re-work in the sapphire material preparation and loading process is saved, and the production cost is lowered; (2) the ultra-smooth laminated sheet with characteristics of glass material and sapphire material is obtained, microcracks in the conventional sapphire processing process are avoided, and the application range of sapphire is expanded, so that the preparation method can be widely applied to the fields of optics, display and substrates.

The invention discloses laser induced low pressure jet flow combined etching processing method and device thereof. The method comprises the following steps: the operations of cutting, drilling and slotting are performed on a workpiece by utilizing high-energy laser beams generated by a laser processing system, and meanwhile erosion is performed on the material surface subjected to laser ablation through high-speed jet flow beams generated by a corrosive medium jet flow device, so that the purpose of removing the material is achieved; the device comprises a laser device and a power source, and further comprises a jet flow generation device and a corrosion liquid circulating reflux device, wherein the jet flow device comprises a corrosion liquid tank, a plunger piston high pressure pump, a pressure gauge, an accumulator, a one-way control valve, a corrosion-resistant spray nozzle and a jet flow device fixed fixture. The method disclosed by the invention has the advantages that the laser ablation is mainly performed, the cooling of high-speed corrosive medium jet flow beams, synchronous erosion and combined processing effect of the cooling and the erosion are added on the basis of the laser ablation, so that the laser induced low pressure jet flow combined etching processing of the material is realized; the invention provides an efficient, clean and combined etching processing process.

The invention discloses a closed oil film visualization device capable of measuring leakage of a reciprocating sealing piston. The device comprises a tabletop visualization mechanism and an oil supply system, wherein the tabletop visualization mechanism comprises a top plate, a base frame, a linear actuator, a pull pressure sensor, a piston and a transparent cylinder; lower leaked liquid detecting components are arranged around the bottom of the piston; an upper leaked liquid height detecting component and a microscope observation component are arranged on the side wall of the base frame; a vertical oil way and a horizontal oil way are arranged in the piston; the two ends of the horizontal oil way penetrate through the side wall of the piston; the vertical oil way is connected and communicated with the upper leaked liquid height detecting component; an annular groove is peripherally formed in the middle part of the piston to serve as an oil closed cavity to be connected to the oil supply system; and gaps are formed in the side surface of the piston and the inner wall of the transparent cylinder. The device solves the technical difficulties in a traditional device, supplies stable liquid pressure, guarantees the bearing capacity and the service life of a glass cylinder, and detects the sealing leakage quantity or the magnitude of pumping back quantity.

The invention discloses an all-fiber-texture large-size double-flange fan main shaft forging method which comprises the steps of raw material smelting quality control, heating, primary firing twice-upsetting and drawing out, number printing, blanket making, secondary firing finish forging forming until a technical dimension of a forged piece is obtained, wherein after being forged, a double-flange fan main shaft forged piece is subjected to primary supercooling, normalizing and tempering heat treatment, rough turning, ultrasonic flaw detection, mechanical property testing, semi finish turning processing, deep hole drilling, stable heat treatment and packaging. The double-flange motor main shaft forged by the all-fiber-texture large-size double-flange fan main shaft forging method is of an all-fiber-texture structure, so that the natural defects that a flange formed by cutting is easy to deform and low in structural balance property and the root is easy to break are completely overcome; the impact mechanical property of the root is improved, the material consumption is reduced, and a requirement of a large-size motor on the main shaft design is met; furthermore, compared with the conventional forging method, the main forging process has the advantages that another operation of firing is reduced, and the economical benefit is improved.

The invention relates to a construction paint, particularly a lithium-base permeable crystallization cement sealing and solidifying agent. The cement sealing and solidifying agent is composed of 15-20 parts of sodium silicate, 8-15 parts of lithium metasilicate, 3-5 parts of magnesium fluosilicate, 2-4 parts of sodium dihydrogen phosphate, 0-6 parts of water-based color paste for paint and 50-70 parts of water. The construction technique comprises the following steps: new ground: troweling the new ground, carrying out primary hardening, coating the solidifying agent, completely drying and curing, flushing the ground with clear water, naturally drying, and sanding and polishing with a sander; and old ground: sanding and cleaning the old ground, coating the solidifying agent, naturally drying, cleaning the ground, naturally drying, and sanding and polishing (or additionally coating solidifying agent, cleaning the ground, naturally drying, and sanding and polishing). By using the solidifying agent and construction technique, the strength, hardness and compactness of the concrete are greatly enhanced, and the durability and weathering resistance of the concrete are effectively improved.

A nondestructive grinding method for the hard and crisp crystal substrate of semiconductor or photoelectric crystal features used of a special abrasive disc prepared from the grinding material chosen from CeO2, SiO2 and barium carbonate and the filler containing activator, oxidant and pH regulator, a finishing disc composed of metallic substrate and electroplated diamond particles, and a deionized water as cooling liquid. Its grinding parameters are also disclosed.

The invention relates to a gypsum base swelling perlite heat-insulating mortar dry powder, wherein each unit of the thermal insulating mortar dried powder comprises the following raw material as the components: expanded perlite 0.9-1.1m3, beta CaSO4*1/2H2O 145-165kg, common silicate cement 18-22kg, grade I coal ash and/or grade II coal ash and/or high calcium ash 45-65kg, polypropylene fiber 0.4-1kg, 80-100 mesh heavy calcium powder and/or calcium carbonate powder 1.3-1.7kg, cellulose methyl and/or methylcellulose propylene glycol ether 1.5-2.5kg, gypsum retarder 3.0-5.0kg and sodium dodecyl silicate 0.008-0.013kg.

Reinforcing panel having high durability, high strength, and high hardness is applied such that a concrete structure may be repaired to have excellent resistance to an external environment and to be structurally excellent. In comparison to existing bonding methods, a concrete structure and a reinforcing panel may be completely attached to each other as a whole using a repairing material with high fluidity as a cement-based material injected into a repair cross section. Part with microcracks is completely filled with repairing cement mortar injected at high pressure. Since reinforcing panel is precast-fabricated in a factory, embossing, intaglio, color, and the like may be easily added to an external surface of the reinforcing panel and an excellent exterior may be provided after repair due to an aesthetic cross section thereof The reinforcing panel fabricated in a factory is applied as to reduce labor costs and construction costs.

The invention provides a preparation method of novel anti-shrinkage dry powder masonry mortar special for autoclaved aerated concrete blocks, and the components and ratios are: 15%-20% of anhydrite, 25%-35% of portland cement, 5%-16% of lime powder, 33%-54% of dry sand (20-40 meshes), 0.6%-0.8% of redispersable latex powder, 0.3%-0.5% of cellulose ether, and 0.4%-0.6% of calcium formate. The dry shrinkage value of the dry powder mortar is adjusted by adding cement and gypsum, and thus is close to a dry shrinkage value of an autoclaved aerated concrete block; the dry shrinkage value of a material for bonding the mortar is close to the dry shrinkage value of the autoclaved aerated concrete block; the synchronization of the shrinkage and the expansion overcomes quality accidents of empty drum, sun crack, and even shedding of masonry and floated coats caused by excessively rapid water loss of walls; and the invention has good value for popularization and application.

The invention discloses C70 mass concrete. The C70 mass concrete is prepared from the following components by mass: 140 to 170 parts of water, 400 to 450 parts of cement, 1,000 to 1,200 parts of crushed stone, 550 to 650 parts of gravel, 70 to 110 parts of coal ash, 60 to 90 parts of mineral powder, 30 to 70 parts of silica fume, 8 to 10 parts of a pumping agent, 35 to 45 parts of an anti-crackingagent, and 0.3 to 0.4 part of an internal curing agent. The invention also discloses a preparation method for the C70 mass concrete. The method comprises a first step of uniformly mixing sand, graveland water and a second step of adding other components and carrying out uniform mixing under stirring. According to the composition of the mass concrete in the invention, mineral powder, silica fumeand fly ash are used as mineral admixtures and can delay the release rate of cement hydration heat and reduce the shrinkage and deformation of the concrete, and the mineral admixtures acts synergistically with the other components to inhibit the generation of cracks at the same time; and the preparation method of the invention is simple in process and easy to implement.

The invention relates to a non-autoclaved foam concrete material and a preparation method of the material. The non-autoclaved foam concrete material is characterized by comprising the following raw material ingredients in parts by weight: 85-96 parts of cement, 2-8 parts of fine sand, 2-10 parts of slag powder, 1.4-2.2 parts of chemical foaming agent, 0.7-1.5 parts of additive, 0.5-1.0 part of fiber and 1-1.5 parts of assistant, wherein the additive is a foam stabilizer, a water reducer and an early strength agent, and a water-material mass ratio is 0.55-0.6. The prepared foam concrete material can reach various performance indexes (foam concrete JG/T 266-2011); various performance is excellent; and the method is simple and practicable, low in cost, obvious in energy conservation effect and appropriate for large-scale popularization and application.

The invention relates to a jet-flow-guided laser-spark-electrolysis combined machining device, and belongs to the field of non-traditional machining. The jet-flow-guided laser-spark-electrolysis combined machining device adopts the structure integrating three non-traditional machining methods, and is composed of a laser generator, a machining module, a working solution circulation system and a power supply module, wherein the laser generator is placed above the machining module, and laser beam machining and spark machining are ensured to be coaxial; an electrode in the machining module for sparking machining can be stationary or rotary; the working solutions for jet-flow-guided laser machining and spark machining employ deionized water, and form a set of working solution circulation system with the working solution for electrolytic machining. When the device is used for machining, the jet-flow-guided laser machining and spark machining are employed as the main means for removing material, being accompanied by electrolytic machining; speed, accuracy and surface quality of part manufacturing are all taken into consideration; thereby, rapid machining of various micro holes with abnormal countersunk heads, and various defects caused by using single non-traditional machining method are overcome.

The invention relates to an optical detection method and a device thereof which are used for detecting the defects of a substrate. The optical detection device comprises an optical unit used for generating a light source to radiate the substrate and a plurality of groups of receiving inductor units of more than one dimension used for receiving an image generated by the radiated substrate, wherein, the light wave of the image contains a specific wavelength section as well as an image capture processing unit for capturing the image.

The invention relates to a 2000 MPa-grade bridge cable galvanized steel wire and a preparation method thereof. The steel wire comprises the following chemical components of, in percentage by weight, 0.88%-0.94% of C, 1.05%-1.35% of Si, 0.40%-0.50% of Mn, 0.25%-0.35% of Cr, less than or equal to 0.07% of Cu, and the balance Fe and inevitable impurity elements; and the steel wire further comprises one or more than one of the following components of, in percentage by weight, 0.0005%-0.0015% of B, 0.01%-0.03% of Nb and 0.01%-0.03% of Mo; and the preparation method of the steel wire comprises the following steps of steel wire rod pre-treatment, drawing and hot galvanizing stabilization. The twisting performance of the galvanized steel wire is improved by strictly controlling of the chemical components of the steel wire rod, the surface quality and inclusion as well as optimizing the drawing and a hot galvanizing process; and the tensile strength of the galvanized steel wire produced by themethod can reach the 2000 MPa or above , and the torsion value is not less than 18 circles.

The present invention provides a method for producing the buffer layer of a conductor coated with high temperature superconducting coating by means of macromolecule assisted nitrate deposition, a. producing a waterless weigh rare earth nitrate or zirconium nitrate and cerous cerium nitrate at an ionic ratio of rare-earth or zirconium: cerium as x:1-x (0.01<=x<=0.5), and dissolve the elements in N,N-dimethyl formamide to form a waterless solution; b. preparing colloid: add polyacrylic acid or polymethacrylic acid to the waterless solution prepared in step a; c. coating the colloid and drying: coat the colloid prepared in step b on a substrate and the dry the substrate. d. sintering: load the dry substrate into a sintering oven, heat up to 850-1150 DEG C at 5-100 DEG C/min speed, hold for 0.25-2h, and then drop the oven temperature to room temperature. The method is characterized in simple process, easy operation control, low cost, and free of environment pollution; the single-layer cerium oxide buffer layer obtained can be in thickness up to 150-200nm.

The invention relates to a welding method, a product and an application of a dissimilar metal. The welding method of the dissimilar metal comprises a high-melting-point material to be welded and a low-melting-point material to be welded, the high-melting-point material and the low-melting-point material are mutually overlapped or connected in a sleeving manner to form a welding seam, the welding seam is welded by the aid of electric arc welding, electron beam welding, laser welding or high-frequency welding, the welding temperature is lower than the melting temperature of the high-melting-point material and higher than the melting temperature of the low-melting-point material, the low-melting-point material is melted to serve as a welding material to seal the welding beam and cooled to form a welding channel, and the width L of the welding channel is larger than or equal to 1.5mm. The melted low-melting-point material directly serves as the welding material to seal the welding beam to form the welding channel with a certain width, so that the melted low-melting-point material and the high-melting-point material are mutually permeated in a certain area range to form solid solution, the permeation quantity of high-melting-point metal to low-melting-point metal is controlled, overall strength sufficiently meets use requirements, more importantly, frangibility of the welding channel is reduced, mechanical properties are improved, the requirements for a welding process are low when welding is performed, and the welding method is easier to control.