36results about How to "Reduce pickling process" patented technology

The invention relates to a copper bus bar with high strength, high conductivity and high toughness and a preparation method thereof. The copper bus bar is characterized in that the material comprises 99.96-99.998% of copper and silver, 0.002-0.02% of yttrium rare earth and 0-0.038% of impurities, wherein silver accounts for 0.0005-0.01% of copper and silver; and the copper master alloy containingthe yttrium rare earth is used as a modifier. The preparation method comprises the following steps: (1) melting a copper material: heating the cathode copper in a mains frequency core induction furnace to melt the cathode copper into liquid cathode copper; (2) modifying liquid copper: melting the modifier in the liquid cathode copper and fully mixing the modifier with the liquid cathode copper; (3) drawing a continuously cast copper bar upwards: causing a crystallizer of a continuous casting machine to stretch into the liquid cathode copper, condensing the liquid cathode copper into the copper bar in the crystallizer and drawing the copper bar upwards by means of two pairs of drawing roll mechanisms in the continuous casting machine to lead the copper bar to a take-up machine via a wheel frame; (4) continuously extruding the copper bar at medium temperature and carrying out anti-oxidation cooling; and (5) carrying out draw forming: putting copper bus bar blanks on a drawing machine, carrying out draw forming on the copper bus bar blanks.

The invention provides a method for cleaning a silicon substrate, comprising the following steps: obtaining a silicon substrate with residual carbon nanotubes and other impurities, performing high-temperature burning treatment on the silicon substrate; The substrate is physically cleaned; the silicon substrate after the physical cleaning is blown dry, and then a reusable silicon substrate is obtained. After cleaning, the surface color of the silicon wafer is uniform, without spots and gray marks; the second carbon nanotube growth test shows that the output of carbon nanotubes reaches 91%-94% of the new silicon wafer, which basically meets the target requirements.

The invention relates to the technical field of titanium alloy wire preparation, and discloses a method for improving the yield of titanium alloy wire. The method includes: A. Straightening the Φ7.8‑8.2mm wire rod and clamping it at the entrance of the swaging machine; B. Using a swaging machine to reduce the diameter of the Φ7.8‑8.2mm wire rod to Φ1.8‑2.2mm ; C. During the diameter reduction process, when the wire diameters are Φ5.8-6.2mm, Φ4.3-4.7mm, Φ3.2-3.6mm and Φ2.4-2.8mm, the vacuum annealing furnace is used for annealing; D , During the reducing process, use anti-wear hydraulic oil to lubricate and cool the wire. The method does not use wire-drawing powder as a lubricant, reduces the pickling process, uses a roller die to reduce the diameter, eliminates scratches on the surface of the wire rod, and ensures the smoothness of the surface. At the same time, through cold working during the diameter reduction process, problems such as serious surface oxidation of the material are avoided, and the yield of the material is greatly improved.

The invention discloses a high-quality flax staple fiber processing method. The high-quality flax staple fiber processing method adopts flax staple fibers as the raw materials and comprises the steps of pretreatment, boiling off, hot water washing, cold water washing, dehydration and drying. The method has the advantages that a weak base and an environment-friendly auxiliary are adopted to remove most of impurities such as pectin, lignin and the like, the selected auxiliary is non-toxic, tasteless, low in cost, good in impurity removal effect, and excellent in biodegradablity without causing wastewater pollution, and the damage to the strength of the fibers caused by a strong base, high temperature and high pressure in the traditional process is solved, and furthermore, the processing procedure is shortened. The processing method is capable of obviously improving the split degree and the uniformity of the flax staple fibers, enhancing the whiteness and the flexibility thereof and improving the spinnability. The split degree of the processed flax staple fiber finished product can achieve 1800 Nm, the average length thereof is 65mm, the breaking force thereof is 112-122cN, and the elongation thereof is 4.6-5.0%; therefore, the technical requirements of the production of flax yarns for circular machine weft knitted single jersey are well met.

The invention discloses a flushing system and method for a lubricating oil system of a steam turbine generator unit. The method includes the first step of connecting a bearing pedestal with an oil inlet and return pipe according to the design state, the second step of removing a bearing oil inlet pipe inside the bearing pedestal, the third step of starting a first oil filtering machine and cleaning a main oil tank and the bearing pedestal, the fourth step of shutting down the first oil filtering machine, pouring all lubricating oil of the main oil tank into an oil storage tank through a second oil filtering machine, and cleaning the main oil tank and the bearing pedestal, and the fifth step of pouring the lubricating oil in the oil storage tank into the main oil tank through the second oil filtering machine, starting the first oil filtering machine, sampling the lubricating oil of the main oil tank for testing, recovering an oil pipe inside the bearing pedestal and finishing the flush if the oil meets NAS7, and carrying out the steps 3-5 repeatedly if the oil does not meet NAS7. The lubricating oil can return to the main oil tank after directly entering the bearing pedestal and being flushed, so that provisional measures taken for oil inlet and return pipes of bearing pedestals are reduced, the cost is reduced, the installation period is shortened, and oil is prevented from secondary pollution.

The present invention provides a small-diameter thin-walled nickel-based pipe fine drawing process, comprising the following steps: 1) Heading the nickel-based pipe; 2) Cold drawing the pipe; 3) Heating and annealing the pipe; 4) Repeating step 2 ) and step 3) multiple times of cold drawing and multiple heating and annealing of the tube; 5) solid solution treatment of the finished tube obtained in step 4) under a protective gas atmosphere, and then cooling; 6) the tube obtained in step 5) Straightening, head and tail cutting, inspection and testing, cutting to length, packaging and storage. The precision drawing process of the small-diameter thin-walled nickel-based tube of the present invention has high process operability, adopts resistance heating annealing, and reasonably controls the holding position, and the position close to the head can reduce cold deformation stress due to heat conduction of the tube and prevent thin-walled nickel-based tubes The cold drawing process breaks the head.

The invention provides a method for cleaning a silicon substrate, comprising the following steps: obtaining a silicon substrate with residual carbon nanotubes and other impurities, burning the silicon substrate at a high temperature; cleaning the silicon substrate burned at a high temperature with an acid solution Chemical cleaning treatment; performing physical cleaning treatment on the silicon substrate after chemical cleaning treatment; drying the silicon substrate after physical cleaning treatment, and then obtaining a reusable silicon substrate. After cleaning, the surface color of the silicon wafer is uniform, without spots and gray marks; the secondary carbon nanotube growth test shows that the output of carbon nanotubes reaches 90%-97.8% of the new silicon wafer, which basically meets the target requirements.

The invention discloses a cladding layer production system and cladding layer production method applied to a micro coaxial cable. The cladding layer production system comprises a paying off frame, anannealing box, a tinning pool and a take-up frame and further comprises a water steam cooling device and a surface cleaning device which are arranged behind the annealing box and are connected in sequence, the micro coaxial cable penetrates through the water steam cooling device, the surface cleaning device comprises a fixed block, the surface of the fixed block is provided with a flexible layer,and the micro coaxial cable is in abut joint with the surface of the flexible layer to form linear contact, through the above production system and production method, the acid pickling procedure is omitted, the environment-friendly pollution-free effect is achieved, and the use rate of tin can be effectively improved.

The invention provides a method for cleaning a silicon substrate, comprising the following steps: obtaining a silicon substrate with residual carbon nanotubes and other impurities, using a plasma beam to polish the silicon substrate; The solution is chemically cleaned; the chemically cleaned silicon substrate is physically cleaned; the physically cleaned silicon substrate is dried to obtain a reusable silicon substrate. After cleaning, the surface color of the silicon wafer is uniform, without spots and gray marks; the secondary carbon nanotube growth test shows that the output of carbon nanotubes reaches 92%-98% of the new silicon wafer, which basically meets the target requirements.

The invention relates to a copper wire hot tinning process which comprises procedures of wire charging, annealing, drying, tinning and wire discharging. The process uses an existing tinning device, and realizes the tinning effect of the prior art through process optimization of continuously introducing water vapor in the annealing procedure and controlling the drying temperature and without cooling or pickling procedures, and the finished product of tinned copper wire is not oxidized or changes color after long-term exposure in the air. The invention is brief in process flow, low in tin loss, can save investment, is green and pollution-free, and is worthy of popularization and application in wire and cable industry.