148results about How to "Extend service time" patented technology

The invention relates to a self-healing environmental barrier coating on the member surface and a preparation method thereof. The theory basis is that: when silicide is added into present EBC, if cracks appear in coating used in a combustion gas environment, silicide on the crack surface or near the crack will be rapidly oxidized to generate silicon dioxide (SiO2) or another oxide, thus the SiO2 can be used as a mobile phase to seal the cracks; furthermore, the volume expansion caused by the oxidation reactions and the high expansion coefficient of the silicide generate pressure stress on the cracks to accelerate the healing of the cracks; so the prepared environmental barrier coating has a good self-healing ability.

A novel a multi-functional polymer viscosity modifier comprising an additive reaction product obtained by reacting a first monomer comprising an alkylacrylate with a second monomer comprising an olefinic carboxylic acylating agent under conditions effective for free radical polymerization of the first and second monomers to provide a base polymer comprising an acylated alkylacrylate copolymer, and wherein the base polymer optionally may be further reacted with an amine compound to provide a multi-functional polyalkylacrylate copolymer. The base polymer has good thickening efficiency. The multi-functional polyalkylacrylate copolymer dispersant viscosity modifier has good thickening efficiency. The base polymer and the multi-functional polyalkylacrylate copolymer viscosity modifier have good thickening efficiency, low temperature properties, dispersancy, and antioxidancy properties. They also have no precipitation or sedimentation, nor cause or encourage such formations in finished fluids incorporating them.

The invention discloses a high alloy matrix metal-ceramic composite and a preparation method thereof, and belongs to the field of wear-resistant materials. According to the high alloy matrix metal-ceramic composite, the volume ratio of high alloy matrix materials to metal-ceramic reinforced particles is (1-10):1; the high alloy matrix materials comprise 1-8% of C, main alloying elements, minor additive elements and the balance Fe and unavoidable impurities; the main alloying elements comprise 0-60%of Ni, 0-60% of Mo, 0-40% of Cr, 0-30% of Mn, 0-20% of V, 0-20% of Ti, 0-15% of W and 0-15% of Nb; and the minor additive elements are one or more of B, Si, Zr, Cu, Co, Al and rare earth. The preparation method adopts a programmed temperature-controlled liquid phase sintering method for preparation and can be used directly for wear-resisting materials, or for wear-resisting materials after subsequent heat treatment; and the metallurgical bonding interface between the reinforced phase and thehigh alloy matrix in the composite reaches 40[mu]m-1mm, no cracks occurs after the integral heat treatment, and the service conditions in the wear-resistant material field are met.

The invention provides a cold extrusion strengthening method for an assembling hole of a CFRP composite material laminate. The method comprises the following steps: (a) providing a bush, wherein the bush can be assembled in the assembling hole; (b) providing a metal core rod with the taper, and inserting the core rod into the bush; (c) arranging the bush in the assembling hole; (d) applying axial force to the core rod by virtue of extrusion equipment, so that the bush is extruded by the part, with the largest diameter, of the core rod; and (e) removing the core rod, so that the bush is fixedly arranged in the assembling hole. Aiming at the assembling hole of the CFRP composite material laminate, the bush is adopted and is matched with a cold extrusion strengthening process, so that the fatigue life of parts can be effectively prolonged, and the service time of an aircraft is prolonged. Because the bush is fastened in the assembling hole, the wear resistance of the connecting structure is improved, and the detachment of assembling fasteners and the maintenance of the parts can be promoted.

The invention relates to an airborne fuel system fuel consumption estimation and health monitor method. The method comprises the following steps of: processing a data sample; building and training a fuel consumption estimation model; integrating the whole leg by taking a fuel flow predicted value and flight time as marks, so as to obtain a predicted value of a fuel consumption gross of a flight inone flight; on the basis of an obtained fuel flow model, adding channels of flight faults and abnormal events for an output layer; inputting obtained training data sample into the fuel flow model improved in the fourth step as a training sample, and carrying out training to obtain fuel flow model which is capable of monitoring airplane faults and abnormities according to airplane data; and inputting data of unmarked faults and abnormities which only undergo packet loss and addition/deletion processing into the fuel flow model improved in the fifth step as test data, so as to monitor the dataof unknown faults and abnormities.

The invention provides a hollow braided pipe modification method, which comprises: modifying a hollow braided pipe by using a modification solution containing a polyphenol compound and a cross-linkedpolymer. The present invention further provides a hollow fiber film preparation method, which comprises: A, modifying the hollow braided pipe as a support material by using the modification method; B,carrying out mineralization treatment on the hollow braided pipe treated in the step A with a salt solution; and C, carrying out surface coating on the hollow braided pipe treated in the step B witha film forming liquid. According to the present invention, the preparation process is simple, the used raw materials are cheap, and the method is suitable for industrial production.

The invention discloses a method for improving the low temperature impact toughness of a 40CrNiMoA material. The method comprises: first cooling the 40CrNiMoA material to a temperature ranging from -80DEG C to -85DEG C at a rate of 2-3DEG C/min, conducting heat preservation for 0.5h-1h; then performing further cooling to a temperature ranging from -180DEG C to -185DEG C, and conducting heat preservation for 2h-3h; and then, raising the temperature to 160DEG C-170DEG C still at a rate of 2-3DEG C/min, conducting heat preservation for 1h-2h, and finally performing cooling along with a furnace. The low temperature impact toughness of the 40CrNiMoA material treated by the method provided in the invention is higher than that of materials that do not undergo deep cooling and low temperature tempering treatments. Thus, the method provided in the invention has great industrial application prospects.

The invention discloses a method for laser cladding Ni-based alloy+B4C wild phase on Q550 steel. The method comprises the following steps: grinding the surface of Q550 steel to remove greasy dirt and rust; cladding an enhancement layer on the surface of Q550 steel by using an optical fiber laser, wherein the technical parameters are as follows: the power is 2.0-4.0Kw, the cladding speed is 10-50cm/min, the laser heat source pattern can be circular spot with diameter being 5mm or rectangular spot with specification of 1.5mm*17mm; laser cladding the surface in forms of circular and rectangular spots, wherein the powder feeding rates are respectively 20-100g/min and 30-150g/min; and removing slag from the surface of the cladding layer, cooling to room temperature and processing chemically. The method disclosed by the invention realizes firm metallurgical combination of the Q550 steel and wild phase alloy powder, so that the method is high in production efficiency and convenient and agile to operate. The obtained cladding layer has fine texture, is free of cracks, pores and slag and also has excellent performance.

The invention discloses a comprehensive control method for the pressure position of a hot continuous rolling rolled side guide plate. At the head of all-variety strip steel, side guide plate head alignment pre-positioning control is conducted according to the finish rolling incoming material plate shape and the transverse vibration situation; for thin-specification plain carbon steel, the cold state width value is calculated at the corresponding rolling target temperature through an instrument, side guide plate middle position control is achieved; for thick-specification high-strength steel, side guide plate middle pressure closed-loop control is achieved; and at the tail of the all-variety strip steel, automatic side guide plate tail pressure closed-loop control is achieved according to the strip steel tail deflection direction. In the whole rolling period, the actual positions of the head and the tail of the strip steel are tracked in real time, and accordingly corresponding actionsare executed. Since the comprehensive control method is input, the on-machine service time of a rolled side guide plate is seven days; the cold-rolled raw material edge breaking material return rate is reduced to 0.46%, the thin-specification plain carbon steel roll head tower-form maximum value is reduced to 30 mm, and steel roll middle maximum roll-shaped sawteeth are reduced to 2 mm; and the abnormal roll shape occurrence rate is reduced to 1.52%.

The invention relates to a damping and noise-reducing wheel for rail transportation. The damping and noise-reducing wheel comprises a hub, a wheel center and a press ring, wherein the press ring is pressed on one side of the wheel center and fixed through threads, and a wheel center convex shoulder and a press ring convex shoulder constitute U-shaped space; the wheel center and the press ring are sleeved with the hub, an annular convex body is arranged in the center of an inner circular end surface of the hub, and an annular closed U-shaped groove is formed between the convex body and the U-shaped space; multiple U-shaped rubber bodies are annularly distributed in the U-shaped groove at equal intervals and are in interference fit with the U-shaped groove under the condition that the wheel is unloaded, and the interference magnitude interval is 6%-14% of the thickness of all positions of the U-shaped rubber bodies; the U-shaped rubber bodies are integrally formed, and included angles between the bottom surface and two side surfaces of each U-shaped rubber body are both 110 degrees. On the basis that the application performance of a traditional resilient wheel is guaranteed, vibration and noise are reduced obviously, unsprung mass of the wheel is reduced, meanwhile, the wheel is convenient to mount, dismount and maintain, heat dissipation is facilitated, and the disperse degree of performance is reduced, so that the service time of the wheel is prolonged.

The invention relates to a high-performance ceramic reinforced iron-based composite material and a preparation method thereof, and belongs to the technical field of composite materials. The compositematerial comprises an iron matrix and a three-dimensional network-shaped ZTA ceramic. The three-dimensional network-shaped ZTA ceramic is a three-dimensional network-shaped ZTA ceramic with a macroscopic size, and the iron matrix penetrates through the three-dimensional network-shaped ZTA ceramic and coats the surface of the three-dimensional network-shaped ZTA ceramic. The preparation method comprises the following steps of sintering zirconium oxide and aluminum oxide ceramic mixed powder slurry through a template replication method to obtain the three-dimensional network-shaped ZTA ceramic;casting and infiltrating molten iron into the three-dimensional network-shaped ZTA ceramic to obtain the three-dimensional network-shaped ZTA ceramic reinforced iron-based composite material. The composite material has the advantages of excellent shock resistance, impact resistance and wear resistance under various severe working conditions.

The invention discloses an electromagnetic harmonic wave exciting device for a high-speed rotating impeller. The electromagnetic harmonic wave exciting device comprises electromagnets, coils, installation boxes, electromagnetic exciter supports, power amplifiers and a signal generator. A sinusoidal signal is generated by use of the signal generator, passes through the power amplifiers and is then transmitted to electromagnetic exciters via a rectifier diode, and a sinusoidal excitation force is applied to the rotating impeller. A pair of electromagnetic exciters constitute a group and are symmetrically arranged at front and back of the impeller. A plurality of electromagnetic exciters are arranged along the circumference of the impeller and form circumferential sinusoidal excitation to the high-speed rotating impeller. The invention solves the problems of over temperature and insufficient excitation force due to that a conventional rotating impeller adopts a gas excitation manner, can meet sinusoidal excitation requirements of the impeller in a vibration test of the high-speed rotating impeller, and can adjust the amplitude of the sinusoidal excitation force.

The invention relates to the technical field of composite materials, and discloses an ultrahigh-temperature corrosion-resistant composite material and a preparation method thereof. The composite material comprises a composite material base body, a bonding layer and a ceramic layer are sequentially deposited on the composite material base body, and the ceramic layer is formed by mixing one or two of rare earth tantalate (RETaO4) and rare earth niobate (RENbO4) in proportion. The prepared composite material can adapt to various severe corrosion environments, the service time of the C/C, SiC/SiC,C/C-SiC and other composite materials can be effectively prolonged, material and energy waste caused by corrosion is greatly reduced, and economic benefits are generated.

The invention discloses a bridge disease big data analysis method, which relates to the field of bridge maintenance and comprises the steps of preprocessing bridge maintenance big data, screening characteristic data, analyzing trend characteristics, finding out parameter association, analyzing disease association, grading technical conditions and the like. According to the invention, statistical characteristics and trends of bridge diseases are quantitatively described; according to the method, the disease influence factors and the first-occurrence and second-occurrence incidence relation between diseases are found out and used for guiding, controlling and preventing bridge diseases, bridge structure performance degradation is delayed through preventive maintenance, maintenance and replacement projects with high cost consumption are reduced, and therefore the bridge service time is prolonged, and the maintenance expenditure is saved.

Disclosed are a degradable zinc alloy peritoneoscope hemostatic clip and a preparing method thereof. The degradable zinc alloy peritoneoscope hemostatic clip is made of a zinc alloy. As for the components of the zinc alloy, an alloy element Mg is added into a pure zinc matrix. The degradable zinc alloy peritoneoscope hemostatic clip has the advantages that by introducing an arc structure and additionally arranging a lock catch, anti-slide insections and a limiting protrusion, stress concentration after the metal hemostatic clip is closed is effectively improved, meanwhile the clamping propertyof the hemostatic clip is effectively improved, and the risk of sliding off of the hemostatic clip after an operation is reduced; zinc is a necessary element of the human body, the good biocompatibility and absorbability are achieved by using the hemostatic clip prepared through the zinc alloy, and meanwhile, the service time of the hemostatic clip is increased obviously through the appropriate degradation in vivo characteristic of the hemostatic clip; the hemostatic clip is simple and easy in structure and simple in preparation technology, and the preparation cost is reduced effectively; andthe designed and prepared hemostatic clip fully meets the clinical use requirement.

The invention discloses a preparation method of an anti-cavitation corrosion-resistant metal-ceramic matrix composite material. The preparation method comprises the following steps: (1) preparing a composite prefabricated part by taking a metal material, a ceramic material and a rare earth material as raw materials; in the composite prefabricated part, the volume ratio of the metal phase to the ceramic phase is (5-95): (95-5); the addition amount of the rare earth material is 0.1-10% of the total mass of the metal material and the ceramic material; and (2) carrying out laser remelting treatment on the composite prefabricated part prepared in the step (1). Due to introduction of the rare earth material, the melting point of the metal-ceramic matrix composite material is reduced, meanwhile, the laser absorptivity of the material is improved, and the cavitation erosion resistance and corrosion resistance of the metal-ceramic matrix composite material are improved. In addition, the metal material, the ceramic and the rare earth material can play a synergistic role in the cavitation erosion-corrosion environment, so that the prepared metal-ceramic based composite material has excellent cavitation erosion resistance and corrosion resistance.

The invention relates to a modular aerostatic island and belongs to the technical field of aerostatics. The problem existing in an existing aerostat is solved. The modular aerostatic island comprises constant lift material units, lift balancing control units and gridding frameworks. The multiple constant lift material units and the multiple lift balancing control units are fixedly connected through the gridding frameworks. All units can achieve industrialized, standardized and large-scale production and have large advantages in product quality control and cost control. According to different service actual needs, the needed unit number can be calculated according to the working condition and the size of the needed aerostatic island, so that the material units are formed through customization and assembly, in this way, arraying and emergency response efficiency can be improved through large-scale production, the units can be replaced and repaired through adjusting the working height, and aloft butt joint between islands can also be achieved, and aerostatic island durable aerostation stationing in a real meaning is achieved. The modular aerostatic island is used for durable aerostation stationing.

The invention belongs to the field of battery control, and provides a multi-stack fuel cell control method, a control device, a system and a vehicle. The control method comprises the following steps that in a starting time period of a multi-stack fuel cell, the currently required power is averagely distributed to each fuel cell stack; in an operation time period after the multi-stack fuel cell is started, the aging degree of the corresponding stack at the current moment is obtained according to the magnitude of the output voltage of each fuel cell stack, and then the power variable at the next moment is allocated to each fuel cell stack according to the aging degree and the variation of the required power at the next moment, so that, the aging degrees of the multiple stacks of fuel cells tend to be consistent.

The invention discloses a high-heat-conductivity long-life blast furnace hearth and further provides a brick lining building method of the high-heat-conductivity long-life blast furnace hearth. The high-heat-conductivity long-life blast furnace hearth comprises a furnace shell, a cooling wall and brick linings which are arranged sequentially from outside to inside. On the lower portion of the hearth, the lower-middle portion of the hearth, the middle of the hearth, the upper-middle portion of the hearth and the upper portion of the hearth, the brick linings comprise small-block carbon bricks,carbon ramming material layers and large-block carbon bricks which are arranged sequentially; and at the top of the hearth, the brick linings are formed by building a plurality of small-block carbon bricks. According to the high-heat-conductivity long-life blast furnace hearth, cracking of the hearth brick linings due to thermal stress and erosion damage caused by harmful elements through cracks can be avoided, circulation erosion of molten iron can be further resisted effectively, thus the erosion damage to the hearth is relieved, and the service life of a blast furnace is prolonged.