72results about How to "Avoid remelting" patented technology

The invention discloses a melting path design method for high energy beam selective melting forming. The method comprises the following steps: 1, acquisition of layered section images of a to-be-machined workpiece: layered section images of multiple layers of the to-be-machined workpiece are acquired and stored, wherein the section of each layer is a to-be-machined area; 2, contour extraction: the contour of each layer of section image is extracted; 3, melting path filling: melting path filling is performed on the multiple to-be-machined areas respectively, melting path filling for any to-be-machined area comprises the following steps: surface layer scanning path filling, inner core scanning area determining and inner core scanning path filling. The method has simple steps and is reasonable in design, convenient to implement and good in use effect; a melting path for high energy beam selective melting forming can be designed simply, conveniently and rapidly, the designed melting path is reasonable, the workpiece machining precision is high, all parts of the workpiece are uniformly heated, and the workpiece has excellent mechanical properties.

The invention discloses a novel slide plate brick for an automatic slag-retaining slide gate of a converter and a preparation method of the slide plate brick. The slide plate brick is characterized by containing the following components in percentage by weight: 58%-68% of tabular corundum, 6%-8% of 98 magnesia, 8%-11% of electrically-fused spinel, 3%-5% of graphite, 4%-7% of a-aluminum oxide powder, 1%-2% of sintering agent, 2%-7% of aluminum-silicon alloy powder and 4%-5% of resin. The slide plate brick can be prepared from the components through the processes of mixing, shaping, drying, sintering, oil immersing, roasting, and machining. By virtue of adjustment on the formula of the slide gate brick and simplification on the production technology of the slide gate brick, the comprehensive performance of the slide gate brick is enhanced, the direct benefit of slag-free tapping with the slide plate brick is high, and beneficial conditions are provided for development of good-quality steel grades, so that the slide plate brick and the preparation method of the brick have a very wide application prospect and remarkable economic and social benefits.

The invention relates to an encapsulation (4) of a sensitive component structure (3) on a semiconductor substrate (2) with a film (5) covering the component structure (3). According to the invention, it is provided that a cavity (8) for the component structure (3) is provided in the film (5). The invention also relates to a MEMS (1) and to a method for encapsulating a sensitive component structure (3).

The invention discloses a method for reducing molten steel nitrogen in a steelmaking link. The method comprises the following steps: controlling combined blowing parameters of a converter, and carrying out phased adjustment; controlling the bottom blowing manner and the flow rate of a steel ladle; adjusting a furnace rear alloying sequence, and adopting a deoxidation principle from weak to strong in sequence; judging whether the converter needs after-blow or not, wherein, for a steel ball of which temperature is increased by blowing oxygen through an RH technology, the converter endpoint temperature is within10 DEG C lower than the lower limit of a key point specified steel tapping temperature, and after-blow warming is not needed; for a steel ball capable of blowing oxygen in the RH technology, the converter endpoint carbon is smaller than or equal to 0.02% higher than aim carbon, and when the temperature reaches a required value, after-blow is not needed. According to the method for reducing molten steel nitrogen in the steelmaking link provided by the invention, by optimizing converter combined blow flow, steel ladle argon bottom blowing and deoxidation alloying sequence and establishing an after-blow principle, under the condition that other technological parameters are not changed, the content of nitrogen in a finished product is averagely reduced by 12 ppm, the performance of steel billets is stably improved, and a larger operation space is provided for a latter process; the method is easy to operate, the cost is not increased, and the practical application effect is good.

The invention provides a method for manufacturing a silicon substrate GaN-based semiconductor material, aiming at solving the problem of re-melting a silicon surface by Ga in the process of extending GaN-based semiconductor material to improve the quality of the product and the production efficiency. The method comprises the following steps of: generating an aluminum nitride buffer layer on the silicon substrate in a reaction chamber of a first MOCVD specially for growing the aluminum nitride buffer layer, and taking out the aluminum nitride buffer layer after the step is completed to form a silicon substrate aluminum nitride template for later use; and placing the silicon substrate aluminum nitride template for later use into a reactor of a second MOCVD for growing a GaN-based semiconductor material to extend the GaN-based semiconductor material; and taking out the silicon substrate aluminum nitride template after the step is completed to form a silicon substrate GaN-based semiconductor material. The method can be applied to production manufacture of light-emitting diodes, diode lasers, power devices and the like.

The invention discloses an LF furnace shallow dephosphorization refining method. The method comprises the following steps that firstly, after molten steel enters an LF furnace, a steel ladle bottom blowing pipe and an external oxygen source are connected, bottom oxygen blowing is carried out, and bottom argon blowing is carried out in the whole refining process; secondly, current delivery and slagging are carried out; thirdly, after slag is molten thoroughly, power is cut off, the bottom argon blowing flow is increased to 800-850 NL/min, stirring is carried out, and dephosphorization is carried out; and fourthly, after dephosphorization is finished, lime is added so as to prevent rephosphorization. Dephosphorization is finished in the LF furnace, molten steel furnace returning is avoided, and the steel making production cost is reduced. Converter terminal point slag returning is mainly adopted to finish dephosphorization, secondary utilization of resources is effectively achieved, and good social benefits and economic benefits are achieved. The molten steel dephosphorization task can be finished only by adopting fluorite, ore, fluorite powder and other conventional materials as the auxiliary dephosphorization materials, the medicament input is little, and cost is saved; and the technology process is simple and clear, operability is high, and control is easy.

The invention belongs to the technical field of soil remediation, and particularly relates to a method for remediation of lead-cadmium polluted soil. A combined remediation method of adsorption solidification and microbial remediation is adopted to remediate lead-cadmium polluted soil. The method particularly comprises the following steps: spreading an adsorbent and a passivator into the soil before crop seeds are sown, spraying water at the same time, then carrying out deep tillage by 5-8 cm, and standing the soil for 10-15 days; and spreading a compound bacterial preparation into the soil, carrying out shallow tillage by 3-5cm, then spraying a film forming solution into the soil, and standing the soil for 10-15 days. Through adoption of the combined remediation method of adsorption solidification and microbial remediation, heavy metals are firstly adsorbed and solidified under action of the adsorbent and the passivator, and then the adsorbed and solidified heavy metals are digested and converted by microorganisms, so that the content of the heavy metals in the soil is reduced, and the heavy metals are prevented from being dissolved again.

To mount a TSOP on an interposer substrate, leads provided to the TSOP are joined to pads of the interposer substrate by a thermosetting conductive resin, and the TSOP exclusive of the leads is joined to ground layers formed in the interposer substrate by a thermosetting conductive resin. The interposer substrates with the TSOPs mounted thereon are stacked in eight layers in such a manner that the TSOPs face downward. Then, leads of the upper interposer substrate are joined to pads formed in the rear face of the lower interposer substrate by a thermosetting conductive resin, so that the interposer substrates adjacent in a vertical direction are connected.

The invention provides a butt-joint low-resistance lead for electronic packaging and a manufacturing method of the butt-joint low-resistance lead for electronic packaging. The butt-joint low-resistance lead comprises a feed-through lead segment, wherein one end of the feed-through lead segment is in butt joint with a low-resistance lead segment, and the length of the feed-through lead segment is matched with the length of packaged glass; the low-resistance lead segment is made of metal materials with the electric resistivity smaller than that of the materials of the feed-through lead segment, and the electric resistivity of the metal materials is smaller than or equal to 2 microhm*cm. According to the butt-joint low-resistance lead for electronic packaging, the feed-through lead segment and the low-resistant lead segment are welded into a whole through electric resistance welding and a brazing method. The manufactured butt-joint low-resistance lead for electronic packaging is high in butt-joint strength, small in resistance and suitable for making high current pass; the butt-joint low-resistance lead for electronic packaging is resistant to high temperature and not prone to annealing deformation at the high temperature of 950 DEG C. Thus, the requirements of a power electronic device shell for high lead current carrying of the lead and high lead arrangement density are both met.

The invention belongs to the technical field of soil remediation agents, and particularly relates to a cadmium-arsenic polluted soil remediation agent which is prepared by taking manganese ore slag and goethite slag for mixing and then crushing to pass through a 200-mesh sieve to obtain mixed powder; calcining the mixed powder to a molten state, adding a surfactant with the mount of 15-20% of themixed powder for heat preservation treatment for 20-30 min, cooling to normal temperature, and performing flash explosion treatment and passivation treatment to obtain the product. The cadmium-arsenicpolluted soil remediation agent can effectively repair cadmium-arsenic polluted soil, has the function of inhibiting harmful microorganisms, and also has the function of preventing heavy metal from dissolving back. The goethite and manganese ore slag are used as curing agents for cadmium and arsenic, so that ion mobility and back dissolution are reduced, and the curing effect is improved; by adding the surfactant in the molten state, the specific surface area is increased, and the adsorption capacity for the cadmium and arsenic in the soil is improved, so that the cadmium and arsenic in the soil can enter crystal lattices.

The invention discloses a transformer oil gas content testing device and a transformer oil gas content testing method for measuring density through a U-shaped oscillation tube, belongs to the technical field of electric power system detection, and solves the problem of how to calculate the gas content in oil according to the change of the density of a tested oil sample before and after vacuum degassing so as to improve the testing precision. According to the device, the U-shaped oscillation tube is used for measuring the density of the oil sample, the measuring precision is very high, the requirement for accurate measurement of the density change of the oil sample before and after degassing can be met, and the gas content in the oil is calculated according to the density change of the oil sample before and after vacuum degassing of the measured oil sample for the first time. The method is a test method with a brand new test principle, is simple to operate, facilitates field test and can adapt to measurement of oil samples with different gas contents.

A preparation method of an electrode bar for PREP comprises steps as follows: collected waste powder is loaded into a cylindrical sheath, vibrating compacting is performed in the powder loading process, the frequency ranges from 15 Hz to 60 Hz, and the vibration amplitude ranges from 0.1 mu m to 1.0 mu m. The size of the cylindrical sheath is required to meet the requirement of the electrode bar, and then degassing and sheath sealing welding are performed on special vacuum equipment; and the cylindrical sheath is subjected to hot isostatic pressing. Then the prepared electrode bar is subjected to machining and subsequent plasma atomization, collected powder is screened, and the waste powder is collected in a separate container and is loaded into the sheath for preparation of the powder after a certain amount of the waste powder is collected. With the method, the powder with the unqualified particle size can be completely recycled, and the yield is increased.

The invention relates to a leaching-purifying method for rare earth concentrate, and belongs to the field of non-ferrous metallurgy. According to the method, a leaching process is adjusted, and a two-stage reverse feeding countercurrent process is adopted, namely, in first-stage leaching, rare earth concentrate slurry is used as a base solution, and a leaching agent is added into the base solution, so that low-impurity rare earth leaching liquid is obtained; in second-stage leaching, first-stage leaching residues serve as raw materials, after a certain number of seed crystals are added, a leaching agent hydrochloric acid is added into the first-stage leaching residues, so that the leaching residues low in rare earth content and an acid leaching solution high in impurity content are obtained, and the acid leaching solution is returned to the first-stage leaching for use; and by means of the leaching process, separation of impurities can be achieved, and rare earth resources can be fully utilized. The method has the advantages of being simple in process, low in cost, high in impurity removal rate, high in rare earth recovery rate and the like, and has good industrial application prospects.

The invention relates to a casting method of electric furnace water cooling cast steel furnace cover, which adopts a cast steel material to cast a base body and a cooling water pipe. The casting method comprises the following steps: adding a slagging agent and a silicon iron alloy block in molten steel for casting steel; putting the cooling water pipe into a casting model and leading a liquid cold medium and a composite solid cooling medium to pass through the cooling water pipe; using molten steel for casting steel to cast the base body, casting the middle part of the cooling water pipe into the base body and leading the two ends thereof to extend from the base body; leading the casting model to be horizontal when in modeling, leading a feeder head to be modeled lopsidedly toward one side and heightening one side of the feeder head of the model after the model is boxed; adopting an upper layer of inner sprue and a lower layer of lower sprue to carry out stepped casting so as to form sequential solidification; and cooling and disassembling the model. The casting method can effectively avoid the cooling water pipe from being penetrated in a fusing manner during the casting process, avoids air gaps from being generated between the base body and the cooling water pipe, avoids refusion and recrystallization, accurately realizes the microfusion of the outer surface of the cooling water pipe, prolongs the service life of the electric furnace water cooling cast steel furnace cover, further prolongs the service life of a metallurgical high-temperature kiln, saves production cost and improves the mechanical performance of the electric furnace water cooling cast steel furnace cover.

The invention discloses high mirror corrosion resistant plastic mold steel and a manufacturing method. The steel contains 0.32-0.46% of C, 0.4-1.2% of Si, 0.4-0.8% of Mn, P which is less than or equalto 0.020%, S which is less than or equal to 0.040%, 10.8-12.8% of Cr, 0.3-1.2% of Cu, 0.5-1.0% of Ni, 0.15-0.25% of Nb, and 0.01-0.03% of N, with the balance being Fe and inevitable impurities. A steel billet can be heated after being charged and preheated at 200-500 DEG C, the preheating time is greater than or equal to 2h, a heating temperature is 1,250-1,280 DEG C, the soaking time is 4-6 h, an initial rolling temperature is greater than or equal to 1,100 DEG C, and a finish rolling temperature is 840-880 DEG C; air cooling can be performed to 100-300 DEG C after rolling; the temperature of primary tempering is 610-650 DEG C, and the heat preservation time is 3.4-6.5 min/mm; the temperature of secondary tempering is 540-580 DEG C, and the heat preservation time is 3.4-5.5 min/mm. The produced die steel has excellent corrosion resistance and surface properties.

The invention relates to a method for enriching and opening ways for impurities in zinc hydrometallurgy lixivium by means of zinc powder purification slag. According to the method, after the zinc powder purification slag and water are stirred and pulpified, slurry is heated to 40-65 DEG C; and then zinc hydrometallurgy lixivium with the temperature being 40-65 DEG C is slowly added into the slurry, heat preservation reaction is performed, liquid-solid separation is performed after the reaction is completed, filtrate is purified lixivium, and filter residue is impurity metal enriched slag. By means of the method, copper, germanium, cobalt, nickel and cadmium are replaced into solid elementary substances which are enriched into slag phases, meanwhile, zinc in the zinc powder purification slag is dissolved into a solution as much as possible, thus, the main impurity elements including the copper, germanium, cobalt, nickel and cadmium in the lixivium are removed and enriched, and the zincin the zinc powder purification slag is efficiently utilized. The method has the advantages that the technology is simple, the cost is low, and the valuable metal utilization rate is high and has thegood industrialization application prospects.

The invention relates to a casting method of a cast steel rotary furnace flue, which adopts a cast steel to cast a base body and a cooling water pipe. The casting method comprises the following steps: adding a slagging agent and a silicon iron alloy block in molten steel for casting steel; putting the cooling water pipe into a casting model and leading a liquid cold medium and a composite solid cooling medium to pass through the cooling water pipe; using molten steel for casting steel to cast the base body; leading the casting model to be horizontal in the modeling process, leading a feeder head to be modeled lopsidedly toward one side and heightening one side of the feeder head of the model after the model is boxed; adopting an upper layer of inner sprue and a lower layer of lower sprue to carry out stepped casting so as to form sequential solidification; and cooling and disassembling the model. The casting method can effectively avoid the cooling water pipe from being penetrated in a fusing manner during the casting process, avoids air gaps from being generated between the base body and the cooling water pipe, avoids refusion and recrystallization, accurately realizes the microfusion of the outer surface of the cooling water pipe, prolongs the service life of the rotary furnace flue, further prolongs the service life of a metallurgical high-temperature kiln, saves production cost and improves the mechanical performance of the cast steel rotary furnace flue.

The invention relates to a method for controlling the carbon equivalent of base iron and an application of the method. According to the method for controlling the carbon equivalent of base iron and the application of the method, the influence of C and Si elements is mainly taken into consideration for calculation of the carbon equivalent and the influence of microelements on the carbon equivalent is ignored; a molten iron treating agent is quantitatively added to enable the Si content change delta Si before and after molten iron treatment to be a constant value, so the theoretical carbon equivalent CE2, namely (CE-delta Si/3), of the base iron can be calculated according to the theoretical carbon equivalent value CE of the cast iron; the detection value CE1 of the carbon equivalent of the base iron is controlled to be near the theoretical carbon equivalent CE2, so the carbon equivalent of the base iron can be adjusted to an eutectic point quickly and effectively, the qualified rate of the nodulized molten iron is increased, return of nodular iron is avoided, and the production cost is effectively reduced.

The invention provides a concrete surface protection treatment method based on a plasma hot-spraying technology. According to the treatment method, firstly, high-pressure air at the temperature of 80DEG C to 100 DEG C is utilized to dry the surface of concrete; next, the high-pressure air is utilized to wrap and carry particles to roughen the surface of the concrete; then, high-pressure air at the temperature of 100 DEG C to 150 DEG C is utilized to flush and preheat the surface of the concrete; and finally, by the aid of plasma hot-spray equipment, a powdery inorganic non-metallic raw material with the particle size of 20 microns to 120 microns is used for hot-spraying an inorganic material protection layer on the surface of the concrete by adjusting the powder feeding rate, plasma power, the airflow rate, the moving velocity, the spraying distance and other parameters. Through the treatment method, the anti-freezing and anti-permeating abilities of the concrete are improved, the defects of poor weather fastness and short service life in traditional organic material protection coating brushing are overcome, and the method can be widely applied to surface protection on concrete prefabricated parts and cast-in-place concrete structures.

The invention refers to electric connection and a method for building the electric connection. The electric connection is established between an in-line package member which has at least one connection pin inserting into a circuit board penetrating sleeve on a circuit board and a soft cloth line path. Conductive connecting points are provided among the at least one connection pin of the in-line package member, the soft cloth line path and the penetrating sleeve. The electric connection enables a transmission control unit (TCU) with a plurality of connecting pins or connecting pins of any electric module to continuously touch with the soft cloth line path and to realize the electric connection between the connecting pins of the TCU and the penetrating sleeve in the electric board. The soft cloth line path is formed by printed wiring membranes which have a plurality of printed lines basically parallel with each other, uniformly extending at intervals and arranged among covering membranes. Accordingly each connecting pin only needs another one soldering joint which can meanwhile be established on a soldering side of the circuit board by any number and using a same soldering method, i.e., a selected soldering method.

The invention discloses a short crystallizer for casting hollow aluminum ingots. The short crystallizer comprises a crystallizer housing, wherein a triangular support is clamped inside an annular groove of the housing and can rotate on the housing; an internal sleeve and an liner are fixedly arranged inside the housing; a core is placed inside the liner; a water inlet is formed above the core, is connected with a core water inlet pipe and is arranged on the triangular support; a water outlet and a water outlet hole are formed below the core; and an aluminum liquid inlet is formed between the core and the liner. The short crystallizer is characterized in that the core (4) is internally hollow and conical, and the height of the core is 80mm-120mm; the height of the upper part of the core (4) is 65%-70% of that of the core, and the conical degree of the upper part of the core (4) is 1: (30-50); the height of the lower part of the core (4) is 30%-35% of that of the core, and the conical degree of the lower part of the core (4) is 1: (15-17); the internal sleeve is made of aluminum alloy; and the liner is made of copper and can be pulled out from the internal sleeve to be and replaced. By shortening the length of the crystallizer, the crystal grains of the hollow ingots are relatively thin, and the surface quality of finished tubes is good; and through the improvement that the upper and lower parts of the core of the crystallizer have two different conical degrees, the remelting and cracking of crystal membranes are avoided.