38results about How to "Avoid excessive erosion" patented technology

The invention relates to a jet type torsional impact drilling tool. The jet type torsional impact drilling tool comprises an upper connector, an outer shell, a float valve, a valve seat spreader plate, a jet element, a jet spreader plate, a punch hammer, an impact transmission cylinder and a spring. The upper connector is fixedly connected with the outer shell, the outer shell is fixedly connected with the impact transmission cylinder, the float valve, the valve seat spreader plate, the jet element, the jet spreader plate and the spring are located in the outer shell, and the punch hammer is arranged in the transmission cylinder. According to the jet type torsional impact drilling tool, the attachment jet element generates alternating jet to drive the punch hammer to swing left and right, and the punch hammer collides with and impacts on the transmission cylinder to make underground torque greatly fluctuate; compared with a conventional drilling mode, the mean value of the torque of an underground drill bit is increased, the torque of the underground drilling tool is made to greatly fluctuate at high frequency in the drilling process, the stick slip phenomenon of the drill bit is alleviated, the probability of bit bouncing is reduced, and drilling efficiency is improved. The drilling tool is fewer in movable parts and quick-wear parts, long in normal work life, and high in safe reliability.

The invention belongs to the technical field of preparation methods of carbon fibers, and particularly relates to a preparation method for a high-dispersity carbon fiber. The preparation method mainly solves the technical problem that conventional carbon fibers are low in strength, and is low in dispersity during preparation processes, and is characterized by comprising the steps of oil applying and bunching, short cutting, pre-non-melting treatment, penetrant spraying, non-melting treatment, high heat treatment and starching. The preparation method has the advantages that the strength of the carbon fiber is high, and the dispersity of the carbon fiber in the preparation process is good.

A feedwell for a gravity separation vessel for introducing a feed stream such as oil sand slurry to the gravity separation vessel is provided comprising a walled member having an upper perimeter edge, a lower perimeter edge and a substantially continuous wall extending from the upper perimeter edge to the lower perimeter edge; an inlet for introducing the feed stream into the walled member positioned adjacent the substantially continuous wall; and a bottom floor having an opening and extending generally beneath the lower perimeter edge; whereby a perimeter of the opening is less than a perimeter of the walled member.

The invention discloses a method for reducing substrate surface damage in the L-shaped side wall forming technology and a corresponding forming method for an L-shaped side wall. A partial dry etching and a partial wet corrosion is used to replace the prior dry etching to process a dielectric layer, thus reducing the damage on the substrate surface during etching process. The specific steps are asfollows: forming the L-shaped side wall from a composite dielectric layer which is deposited on the substrate, wherein, the composite dielectric layer comprises a sacrifice layer, a dielectric layer and an oxidized layer. The method for reducing the substrate surface damage is used for etching process of the composite dielectric layer. The method comprises the following steps: removing the dielectric layer which is exposed outside and has certain thickness by the dry etching; and removing the dielectric layer which is exposed outside and has remaining thickness by the wet corrosion.

The invention discloses clad material solid / liquid composite horizontal continuous casting and forming equipment and method, and belongs to the technical field of clad material continuous casting. According to the clad material solid / liquid composite horizontal continuous casting and forming equipment and method, the measures that a core material protection device, a flow guide pipe, an inversion solidification device and the like are adopted and mounted below a crucible, core materials are not heated in advance, the inversion solidification device with small capacity is designed, the core materials are prevented from penetrating through clad layer melt metal for a long time, the melt metal flows out from the bottom of the crucible by relying on self-weight, and the size of the inversion solidification device and the size of a water-cooled crystallizer are controlled effectively are taken, the high quality clad materials of needed shapes and sizes are formed through horizontal continuous casting, and the equipment and the method are especially suitable for horizontal continuous casting forming of the large-size clad materials which are hard to reel up and has the melting point of the clad layer metal lower than that of the core material metal. The equipment and method have the advantages that the equipment is simple in structure, parts are easy to replace, operation and maintenance are convenient to carry out, layout is reasonable and compact, production efficiency is high, investment is small, automatic control is easy to achieve, large-scale industrial production is facilitated, the procedure of the forming process is short, energy is saved, environment is protected, efficiency is high, cost is low, the combination freedom of the clad layer metal and the core material metal is large, and the prepared clad materials are good in quality and performance.

The invention relates to a saline-alkali soil treatment system and method. The saline-alkali soil treatment system comprises movable transportation equipment, a soil shoveling assembly, a soil collection assembly, a soil component fluidization assembly, a test paper analysis and test system, an adjusting liquid distribution assembly and a soil turning assembly, wherein an inductor assembly is arranged in an inductor channel, the inductor assembly has two states, the first state is the work state in which the system is in contact with to-be-tested soil, and the second state is the state in which an inductor is protected and does not work; the test paper analysis and test system comprises a test paper conveying mechanism which can be used for conveying, replacing and recovering a test paperroll. According to the saline-alkali soil treatment system and method, the system can be driven to land needing saline-alkali soil treatment at any time according to requirements, soil can be detectedand treated at the same time, the automation degree is high, remote operation can be achieved, and therefore operators and later personnel can work more conveniently and save labor.

A gas turbine engine combustor basket has nested outer and inner liners that are separated by a gap at their respective distal downstream ends for passage of cooling air between the liners. Radially inwardly projecting platefins formed on an inner circumferential surface of the outer liner maintain the cooling air passage gap. In some embodiments effusion cooling through holes are formed in the inner liner outer circumference, oriented in the air passage gap between the fins, so that cooling air passes through the effusion holes into the cooling air passage gap.

A first insulating layer is disposed on a second surface of a semiconductor substrate, and has an opening. A second insulating layer is disposed on the second surface and separated from the first insulating layer. A stack includes, in sequence on the second surface, a side n-type epitaxial layer and first and second p-type epitaxial layers that are made of a gallium-nitride-based material. The stack has an outer side wall having a portion formed of the second p-type epitaxial layer, an inner side wall extending from the second insulating layer, and a top surface. The n-type contact layer is disposed on the top surface. The source electrode portion is in contact with the n-type contact layer on the top surface, and is in contact with the second p-type epitaxial layer on the outer side wall. A gate insulating film is disposed on the inner side wall.

A first insulating layer (41) is provided on a second surface (P2) of a semiconductor substrate (31), and has an opening (OP). A second insulating layer (6) is provided on the second surface (P2), andis separated from the first insulating layer (41). A laminate (51) sequentially comprises, on the second surface (P2), a lateral n-type epitaxial layer (7) and first and second p-type epitaxial layers (8, 9), said layers being formed from a gallium nitride material. The laminate (51) has an outer side wall (SO) which has a portion that is formed of the second p-type epitaxial layer (9), an innerside wall (SI) which extends from the second insulating layer (6), and a top surface (ST). An n-type contact layer (12) is provided on the top surface (ST). A source electrode part (14) is in contactwith the n-type contact layer (12) on the top surface (ST), while being in contact with the second p-type epitaxial layer (9) on the outer side wall (SO). A gate insulating film (16) is provided on the inner side wall (SI).

The invention relates to the technical field of packaging bag paper production, in particular to a production process of aluminized laser paper. The production process comprises the following steps: 1) coating a release agent on a substrate to form a release layer; 2) drying the substrate coated with a release material; 3) imprinting a dried film so that the surface of the substrate can have a laser pattern; 4) conducting vacuum aluminum plating on the substrate, and then conducting protected layer coating on a specified position; 5) immersing the substrate coated with the protected layer in an alkaline liquid pool for aluminum washing and drying again; 6) conducting spot-coating on the surface of the substrate, then compounding the substrate and base paper through a compound device and then drying again; 7) curing composite paper, peeling off the substrate, and transferring the laser pattern to the surface of the base paper. After the release agent is used on the substrate, the durability, compression resistance, solvent resistance, and low temperature resistance are improved, and at the same time, and an alkaline solution can be effectively prevented from excessively eroding thesubstrate when aluminum is washed.

Low head loss systems are detailed. The systems may include chambers having low impedance to water flow therethrough and repositionable gates or other valves within the chambers. The valves may direct water as a function of whether an associated heating device is active. At least some gates may incorporate poppet valves or other high-flow by-passes.

The invention relates to a cold pickling solution for identifying surface defects of high-nitrogen stainless steel and application of the cold pickling solution, and belongs to the technical field of alloy surface defect identification. The cold pickling solution for identifying the surface defects of the high-nitrogen stainless steel is prepared from the following components in percentage by mass: 2.1 to 4.3 percent of HCl, 19.5 to 25.5 percent of H3PO4, 8 to 17 percent of FeCl3 and the balance of water. According to the formula of the cold pickling solution, the surface of high-nitrogen stainless steel can be quickly corroded, the corrosion time is only 1-2 min, the pickling amount after corrosion is 2 microns or below, excessive damage to the surface quality of parts is avoided, the identification accuracy rate of the grinding burn defects of the surface of the high-nitrogen stainless steel bearing reaches 100%, and in addition, long-term stable storage of the cold pickling solution can be guaranteed; and the effective service life is more than three months.

The invention discloses a solid chelating acid used for increasing injection of water injection wells and a preparation method thereof, and relates to the technical field of depressurization and increasing injection of water injection wells in oil fields. The solid chelating acid used for increasing injection of water injection wells is composed of the following weight Percentage of raw material composition: 30-40% for the main agent, 20-30% for the auxiliary agent, 10-15% for the enhancer, 3-8% for the active agent, 2-3% for the inhibitor, and 5-5% for the stabilizer 10% and binder at 15‑30%. Adoption of the present invention can reduce the safety and environmental hazards in the process of transportation, storage and use in acidification and plugging removal, greatly improve the slow-release rate of acid liquid, expand the radius of plugging removal, facilitate the removal of plugging in the deep part of water injection wells, and improve the measures for reducing pressure and increasing injection of water injection wells Efficient.

A gas assisted spray nozzle assembly having a nozzle body in the form of a one piece hollow tubular member, such as a single cylindrical pipe section, which defines a mixing zone and a downstream barrel extension zone. A liquid inlet and an impingement pin are supported by said tubular member in opposed relation to each other at the mixing zone, and pressurized gas inlet is provided at an upstream end of the tubular member. The impingement pin in this case has an impingement surface radially offset from a central axis of the mixing zone on a side opposite the liquid inlet for receiving pressurized liquid and redirecting the liquid toward the central axis for enhanced intermixing with and atomization by the pressurized gas stream.

The invention provides a method for raising coral tree seedlings, which belongs to the technical field of coral tree planting, comprising: 1) pretreatment: taking coral tree seeds and disinfecting them in potassium permanganate solution at 36-38°C; The pretreated coral tree seeds are acid-etched with a mixed concentrated sulfuric acid solution containing ether; 3) Hormone treatment: the acid-etched coral tree seeds are soaked in an ethanol solution containing indole acetic acid and fluorenemethanol; 4) germination by low-temperature stratification : Carry out wet and cold stratification germination to coral tree seeds with 3-5 year old pine sawdust; 5) Sowing: Seedlings are sown after being disinfected and disinfested, and germinate and grow into seedlings. The beneficial effects are: the method is easy to implement, can effectively awaken coral tree seeds in a dormant state, helps to stimulate the growth and development of radicles, accelerates the germination of radicles, improves the germination rate of seeds, accelerates germination, and the germinated seedlings are strong and transplanted. Planted high survival rate.

The invention discloses an electrochemical polishing method for metallic uranium. The electrochemical polishing method comprises three steps of preprocessing, electrochemical polishing and post-processing. As polishing solution in targeted preparation is selected, and as parameters and process during electrochemical polishing process is optimized in a targeted way, metallic uranium does not separate gas during electrochemical polishing process, thereby improving current utilization and shorten polishing time; and meanwhile, excessive corrosion of metallic uranium is avoided and the loss of metallic uranium is reduced. The electrochemical polishing method provided by the invention is fast in polishing speed, good in effect, simple in process, and can be carried out at room temperature, thus, the active effect on the application of metallic uranium is promoted.

The invention discloses a method for oxidizing a brake master cylinder, which comprises the following steps of: 1, hanging, namely hanging the brake master cylinder to a rack special for oxidizing the brake master cylinder; 2, performing weak acid oil removal treatment; 3, preparing anode oxidizing tank liquor; 4, performing anode oxidization treatment; and 5, taking out the brake master cylinder, cleaning, and performing enclosed drying treatment. The brake master cylinder treated by the method meets the industrial requirements on quality such as film thickness, roughness, hardness and the like.

Pb-Sn-Sb-Ag alloy brazing filler metal is mainly used for soldering of metal coatings of an electronic device. The brazing filler metal comprises, by weight, 15.5-16.5wt % of Sn, 7.0-8.0wt% of Sb, 0.01-1.2wt% of Ag and the balance of Pb. The brazing filler metal is moderate in melting temperature, has excellent wettability for the metal coatings, and is good in brazing process and applicable to soldering of silver (alloy) coatings, gold coatings and copper of electronic devices, and thermal impact resistance of brazing seams is good.