186results about How to "Reduce pitting" patented technology

An aluminum alloy clad sheet for heat exchangers includes a core layer, a sacrificial layer disposed on one side of the core layer, and a brazing layer of an Al—Si alloy disposed on the other side of the core layer, wherein the core layer contains Si: 0.15% to 1.6% by mass, Mn: 0.3% to 2.0% by mass, Cu: 0.1% to 1.0% by mass, Ti: 0.02% to 0.30% by mass, and the remainder of Al and incidental impurities, and the sacrificial layer contains Zn: 4.0% to 10.0% by mass, Cr: 0.01% to 0.5% by mass, and the remainder of Al and incidental impurities.

The present invention relates to technical field of biological material, and is especially suitable for surface modification field of biological medical material. Particularly the invention provides a medicine-taking degradable magnesium alloy cardiovascular bracket and a preparing method thereof. The aim of the invention is to reduce the initial degrading speed of magnesium alloy in biosome and carry therapeutic medicine on the surface of magnesium bracket thereby guaranteeing the mechanical performance of magnesium alloy bracket in vivo and better restraining the hyperplasia of newborn tunica interna. A fluoro-containing transition film is prepared on the surface of magnesium alloy bracket, and a medicine-carrying layer is prepared on the outer layer of magnesium alloy bracket. A protecting layer is the fluoro-containing transition film. The fluoro-containing transition film has self-concrescence capability in the degradation process of magnesium alloy and can effectively reduce the in-vivo degradation velocity of magnesium alloy bracket. The surface of degradable magnesium alloy cardiovascular bracket is smooth and is not easily generated with surface cracking and breaking-off. The medicine-taking layer is composed of medicine carrier polymer or protein and therapeutic medicine. The medicine-taking layer can release therapeutic medicine, reduce the generation rate of stenosis after the implantation of bracket and has a control function to the degradation velocity of magnesium alloy bracket.

The invention belongs to the technical field of enamel material, and specifically relates to a vanadium-titanium enamel glaze material, and a preparation method thereof. The preparation method is used for solving technical problems that cost of a conventional vanadium-titanium enamel glaze material is high, glossiness of enamel glaze obtained via sintering is not high enough, fishscaling is observed, and acid and alkali resistance is not high enough. The vanadium-titanium enamel glaze material is prepared from, by mass, 22 to 28 parts of pretreated vanadium-titanium magnetite titanium separation tailing or vanadium-titanium boundary ore, 20 to 22 parts of feldspar powder, 5 to 8 parts of quartz sand, 24 to 26 parts of borax, 1.5 to 2 parts of sodium nitrate, 3.5 to 5.5 parts of lithium carbonate, 5 to 7 parts of fluorite powder, 0.1 to 0.3 part of sodium fluosilicate, 3 to 5 parts of cryolite, 2 to 4 parts of limestone, 3 to 4 parts of cobalt nitrate, 1 to 2 parts of nickel nitrate, 2 to 3 parts of sodium vanadate, and 1 to 2 parts of antimony oxide. Firm combination of the vanadium-titanium enamel glaze material with carbon steel billet can be realized; acid and alkali resistance is higher than that stipulated by national standard; and the vanadium-titanium enamel glaze material can be used for a plurality of matrixes such as hot-rolled carbon steel and cast iron.

The invention discloses a mirror polishing method for polishing a surface of a lens sheet mould main body. The mirror polishing method comprises the following steps: sanding and priming the surface of the lens sheet mould main body; smoothening sand marks on all faces of the lens sheet mould main body; and grinding and cleaning the surface of the mould main body. By polishing in a gradual way of rough polishing first and then fine polishing, the surface of the lens sheet moulding mould main body meets requirements of a mirror surface, thus providing a firm condition for improving the quality of a downstream lens sheet.

The invention discloses a manufacturing method of a miniature and thin-walled composite ceramic wave-transparent antenna housing. The manufacturing method includes the following steps that: a corresponding braiding core model is designed according to size requirements of a housing body; quartz fiber yarns are adopted as raw materials so as to be attached to and braided on the braiding core model, so that required housing body braided fabric can be obtained; the housing body braided fabric is boiled in water, and then is socked in acid liquid, and finally is socked and composited in a container filled with a silica solution, and therefore, a housing body blank can be obtained; and a bonding part of a connecting ring and the housing body is processed, so that the miniature and thin-walled composite ceramic wave-transparent antenna housing can be obtained. According to the manufacturing method of the invention, mechanical processing is divided into coarse processing and fine processing, and therefore, processing quality of the surface of the housing body can be effectively ensured, and pits on the surface of the housing body are decreased significantly, and at the same time, the uniformity of the materials of the housing body can be improved; after mechanical processing every time, high temperature heat treatment is performed on the housing body blank, and therefore, organic impurities such as oil contamination by which the housing body blank is contaminated in a machining process can be effectively removed, and the performance of a product can be effectively ensured.

The invention relates to an electron beam welding method for dense rectangular ring welding lines of an outer ring face. According to the electron beam welding method for the dense rectangular ring welding lines of the outer ring face, a thickness-unequal butt joint form increasing the local thickness of the welding part head portion is designed, and a beam flow guiding welding along long edges and lap-joint and step-attenuating beam flow closing welding method is adopted, so that the amount of molten metal is increased, the welding line molding quality is improved, and the process stability and margin are improved; misplaced and lapped U-shaped protective structures are designed inside an outer ring, and injuries by burning on a shaft rod and an inner ring structure are avoided; and a symmetrical welding method is adopted, the welding sequence is designed, a grouped multiple welding manner is adopted, the accumulation effect of dense welding-line welding heat input and stress deformation is reduced, influence of the dense welding-line stress deformation on welding gaps, order difference and the like is reduced, the welding quantity is improved, control of welding deformation and structural size accuracy is facilitated, and the welding finished product rate is increased.

The present invention relates to a high strength and high toughness alloy with a low density and the method of making thereof. The alloy essentially comprises 15 to 33 wt % of manganese, 6 to 10 wt % of aluminum, 0.6 to 1.2 wt % of carbon, 0.1 to 1.0 wt % of silicon, and the balance of iron. The alloy has excellent properties of a density of 6.6 to 6.9 g/cm³, an elongation of 25 to 70%, and a tensile strength of 100 to 190 ksi. In particularly, and the alloy is useful for golf club heads with excellent properties. Further, the use of the alloy reduces pits and defects generated during the electroplating process of the heads. Therefore, the defect rate of the product is remarkably decreased so that the cost is reduced.

A heating method of weak, micro-oxidation and oxidation combustion for ferrous metal steel slabs used in industrial furnaces with natural gas as a fuel. Excess air coefficients of a first heating section, a second heating section, and a soaking section of a heating furnace are set; in order to allow a display value of a residual oxygen analyzer to be within 1-4.5%, the excess air coefficients are set to be 1.1-1.2 for the first heating section, 0.96-0.99 for the second heating section, and 0.95-0.98 for the soaking section. The effect is realized that the natural gas combustion in the heating furnace hearth is incomplete combustion and complete combustion. The effect of complete combustion is realized in the first heating section of the heating furnace hearth, and the effect of incomplete combustion is realized in the second heating section and the soaking section. According to the invention, the atmosphere has a characteristic of micro-oxidizability after combustion in the heating furnace; the heating process of ferrous metal steel slabs in the second heating section and the soaking section is reduced; and less oxide scale is generated on the surface; the problem of steel plate surface depression caused by heating factors is reduced; energy saving is realized; the thickness of the oxide scale on the slab surface in the heating furnace hearth is reduced; and the defect of steel plate surface depression caused by heating factors is greatly reduced.

The invention relates to an extrusion deformation method of an aluminium alloy profile, comprising the following steps of: heating an aluminium alloy blank to be 100-200 DEG C, keeping the temperature, preheating an extrusion mold to ensure that the temperature of the extrusion mold is higher than the surface temperature of the aluminium alloy blank by 50-150 DEG C, then placing the aluminium alloy blank into the extrusion mold, and extruding under the conditions that the extrusion ratio is 8-42, and the speed of an extrusion mold punch head is 20-30mm.s<-1>. The extrusion deformation method realizes larger improvement of comprehensive performances of the extruded aluminium alloy such as the tenacity and the like, has the advantages of simple process, low cost, low energy consumption, high production efficiency and great improvement of tenacity of the aluminium alloy, and can be used for producing profiles such as bar materials, wire materials, plate materials and pipe materials and the like made of aluminium alloy.

The reverse temperature field extrusion process as improved extrusion process for producing microcrystal magnesium alloy includes the following steps: preheating extrusion mold, setting magnesium alloy blank into the extrusion mold, controlling the mold temperature the same as or 30-50 deg.c higher than that of blank surface and the temperature difference between the core of the blank and the surface of the blank in 20-400 deg.c, and extrusion at extrusion ratio of 2-64 and extrusion ram speed of 20-30 mm/s. Extruding magnesium alloy in the said reverse temperature field and at extrusion ratio of 4-6 can fine the crystal particle to below 10 micron, or below 5 micron optimally. Meanwhile, the extruded magnesium alloy has obvious raised plasticity and unit extension over 20 %. The present invention may be used in producing magnesium alloy rod, plate, section bar and pipe.

The present invention relates to one kind of life increasing device for resistance spot welding electrode, and belongs to the field of resistance spot welding technology. The device includes one upper movable rack, one upper rack connected movably to the upper movable rack, one lower movable rack, one lower rack connected movably to the lower movable rack, one upper main shaft, one lower main shaft, springs separately between one main shaft and one rack, one arced upper flywheel, one arced lower flywheel, one upper ratchet wheel mechanism, one lower ratchet wheel mechanism, copper tabs on the flywheels, one upper link rod mechanism, one lower link rod mechanism, one upper hook mechanism and one lower hook mechanism. It has the advantages of reduced alloying, less wear, less pitting corrosion, less heat fatigue and long electrode life.

The invention relates to a honeycomb-shaped polygonal self-lubricating gear. Honeycomb-shaped grooves, strip-shaped grooves, middle strip-shaped chip grooves and top strip-shaped chip grooves are processed in a tooth surface of the honeycomb-shaped polygonal self-lubricating gear; the honeycomb-shaped grooves are positioned in the middle of the tooth surface, and are filled with self-lubricating materials; the strip-shaped grooves are positioned in the top of the tooth surface, and are filled with the self-lubricating materials; and the middle strip-shaped chip grooves and the top strip-shaped chip grooves separately penetrate through the whole tooth surface and are formed in the top of the tooth surface, are distributed in a spaced mode, and are beneficial for chip removal. The invention discloses the honeycomb-shaped polygonal self-lubricating gear which is inspired by a honeycomb shape based on the bionic idea; compared with an existing gear, the honeycomb-shaped polygonal self-lubricating gear has self-lubricating characteristics, does not need to additionally add media such as lubricating oil and lubricating grease, enriches a gear lubricating mode, and can meet normal operation when the gear is under extreme working conditions such as an oil-free working condition and an oil-lack working condition.

It is an object of the present invention to provide an epitaxial wafer with fewer pit defects in the epitaxial layer of a silicon monocrystalline wafer that has been doped with arsenic. Pit defects tend to occur when gas etching is performed prior to epitaxial film formation, but this tendency is reversed and a sound epitaxial layer is obtained by setting the crystal plane orientation to (100) and specifying the range of the tilt angle for the angle θ in the [001] direction or [001] direction or the angle θ in the [010] direction or [010] direction with respect to the [100] axis.

The invention relates to a bionic tooth surface gear based on the surface topography of butterfly scales. Its surface is processed with lines similar to the surface topography of butterfly scales. It consists of regularly arranged grooves and circular pits, and the grooves are arranged in parallel. The circular pits are distributed in the middle of two adjacent grooves. Based on the idea of ​​bionics and inspired by the surface morphology of butterfly scales, the present invention proposes a bionic tooth surface gear based on the surface morphology of butterfly scales. Compared with the existing technology, the self-cleaning performance of gears can be effectively improved, and it can be applied to open, When the semi-open gear is driven, it is beneficial to prolong the life of the gear.

The present invention is one kind of polishing liquid with nanometer SiO2 abrasive for SiO2 medium in multilayer wiring of VLSI. The polishing liquid consists of SiO2 hydrosol as abrasive 20-45 wt%, composite alkali 0.5-5.5 wt%, penetrant 1.0-10 wt%, surfactant 1.0-10 wt%, chelating agent 0.5-10 wt% and the deionized water for the rest. All the materials are mixed gradually through stirring to form the polishing liquid. The polishing liquid has high polishing efficiency, low cost and less pollution.

The invention discloses gear oil special for a reduction gearbox of a pumping unit. The gear oil is prepared from, by mass, blend base oil, metallocene polyisobutene, metallocene polymerized alpha olefin 150, polymethacrylate, an extreme pressure anti-wear agent, a cleaning gent, a dispersing agent, benzotriazole, a defoaming agent and a demulsifying agent T1001, wherein the blend base oil is prepared from paraffin-base base oil 600 SN, residual oil 150 BS and hydrofined oil 250 N, and a mixture of thiophosphoric acid amine salt, bisoctyl dithiophosphate zinc and/or oil-soluble molybdenum is adopted as the extreme pressure anti-wear agent. The gear oil for the reduction gearbox is better in physical and chemical index and using performance than industrial closed gear oil, has the good extreme pressure anti-wear performance, thermal oxidation stability, corrosion resistance and anti-emulsification performance and meets the using requirements of oil pumping unit oil of an oil field.

The invention provides a polishing solution applied to the magnesium alloy. The polishing solution comprises an abrasive, a strong oxidant, a pH regulator and deionized water; the components are as follows by weight percentage: 10 percent to 40 percent of the abrasive I, 0.1 percent to 3 percent of the strong oxidant, 1 percent to 10 percent of the pH regulator and the balance is deionized water. The polishing solution can be used for polishing treatment of magnesium-alloy surface, effectively improve surface finish of the magnesium alloy, effectively reduce surface scratch after polishing, and reduce surface roughness after polishing; simultaneously, polishing debris is dissolved in the polishing solution, the magnesium-alloy surface is easy to be cleaned, the polishing speed is rapid, the polishing solution has no harm to equipment, and the usage security is high.

The invention discloses a long-service-life multi-protection coolant. The coolant is prepared from a propylene glycol and ethylene glycol blend, citric acid, simethicone, sodium silicate, starch, glycerol, tribasic polycarboxylic acid, a formic acid and acetic acid mixture, a succinic acid and dodecanedioic acid mixture, montmorillonite nano-particles, a lauric acid and palmitic acid mixture, nano-alumina and guar gum by weight. The coolant is good in cooling performance, the problems that due to gel polymerization of traditional silicate in a coolant, the corrosion inhibition of the coolant is reduced, and a pipeline is blocked are solved, and the problem that an existing engine coolant lacks the protection function for cast aluminum components of a cooling system is also solved; the ingredient composition of the coolant is improved, various comprehensive properties of the coolant are improved, soldering tin of the cooling system is greatly protected, pitting corrosion caused by the engine coolant to the engine cooling system is greatly reduced, and the protection performance of inhibiting cavitation corrosion is improved.