813 results about "Accelerated aging" patented technology

The invention provides a testing device and a testing method of electricity-heat-mechanical stress three-factor combined ageing for transformer paper oil insulation ageing study; the testing device comprises an electric heating ageing oven, in which a transformer paper oil insulation simulator, a shake unit and a temperature control device used for controlling the temperature of the electric heating ageing oven. The shake unit can drive the simulator to vibrate, the simulator is electrically connected with a high-voltage power supply; the testing method includes vacuum drying and oil impregnation of insulating paper, attaching the paper to the earth electrode in a stainless steel case of the testing device, winding coils as a high voltage electrode outside the insulating paper and the earth electrode and injecting insulating oil to the stainless steel case; connecting a high tension lead with the high-voltage power supply and starting the shake unit; sampling the insulating paper and the insulating oil alternately and measuring insulation ageing parameters.

The invention discloses a construction method for a lithium battery health life model, and the method is used for the recognition of the aging degree of a lithium battery. The method comprises the steps: firstly carrying out the health lift testing of the lithium battery; secondly constructing the health factor of the lithium battery according to the testing data; thirdly building the lithium battery health life model according to the constructed health factor, thereby achieving the prediction of the health state of the lithium battery; fourthly sequentially carrying out the testing of basic performances at four temperature points (25 DEG C, 40 DEG C, 10 DEG C and 55 DEG C) during the testing of the health life; fifthly carrying out the acceleration aging testing at the degree of 55 DEG C; and finally finishing the testing when the static capacity test value decreases to 75% of a rated capacity. The method carries out the direct obtaining of the performance parameters of the lithium battery based on testing data, carries out the research how to extract the health features to achieve the recognition of the aging degree of the lithium battery, and can be used for achieving the prediction of the health state of the lithium battery.

A method of determining the ageing characteristics of an LED comprises applying a current stress pulse to the LED. The LED is monitored to determine when the thermal heating induced by the current stress pulse has been dissipated to a desired level. The operational characteristics of the LED are then measured before applying the next stressing pulse.

This method accelerates the effect of aging in a reproducible way and therefore is able to greatly reduce the time needed for a reliability test.

An integrated circuit includes an accelerated aging circuit block that has at least one circuit that ages at a faster rate than a functional circuit block. The accelerated aging circuit block is monitored during normal operation of the integrated circuit. Changes in the accelerated aging circuit block are used to generate data indicative of an aging trend for the functional circuit block.

The invention belongs to a micro-electronic encapsulation technology and specifically relates to a vacuum eutectic welding method. The method comprises the following steps: reducing gas formic acid vapor or hydrogen is introduced during a vacuum eutectic welding process, so as to reduce an oxidized welding material on a surface layer of a preformed welding material sheet and reduce the oxidized dreg of a welded surface; during a heating process, nitrogen is introduced and the heating rate is increased, so as to shorten the eutectic time and avoid the efficacy loss caused by chip over-welding or high-temperature accelerated ageing; and vacuumizing is carried out during an eutectic process, so as to reduce and even avoid voidage of the welded surface, increase the penetration rate of the chip and reduce the contact resistance and thermal resistance. According to the invention, the problem of the oxidized dreg on the welded surface caused by the oxidation of the surface layer of the welding material sheet in the prior art is overcome; the demand on storage conditions of the welding material sheet is reduced; the eutectic time is shortened; the efficacy loss caused by chip over-welding or high-temperature accelerated ageing is avoided; the void ratio is reduced; and the vacuum eutectic welding method has the characteristics of high reliability, high yield and low cost.

The invention discloses a corona aging acceleration device and a corona aging acceleration method for a polymer insulating material. The device comprises a sealed corona aging experimental case in which a pin array electrode and a metal plate electrode are arranged, wherein the pin array electrode is connected with a high voltage generation device; the metal plate electrode is grounded; a pinpoint array is arranged on the pin array electrode; a test sample is arranged on the metal plate electrode, and is opposite to the pinpoint array; and after voltage is applied, uniform corona discharge is generated between the pin array electrode and the metal plate electrode to perform corona aging on the test sample. The device and the method have the advantages of low requirements on experimental conditions, convenience for operation and quantitative control over aging factors in an experiment, and short experimental period, and are applied to researches on the corona aging resistance of insulating materials in a laboratory.

The invention discloses a non-cured rubber asphalt waterproof paint. The preparation technology of the paint comprises the following steps: heating the asphalt to 140 DEG C, loading the heated asphalt into a stirring tank, adding a softening agent, rubber powder, and polymer, stirring for 30 minutes, heating to 160 DEG C, delivering the mixture to a colloid mill to grind the two edges, heating to 190 DEG C, adding a special additive, stirring for one hour, cooling to 160 to 170 DEG C, adding an auxiliary agent, stirring for one hour, adding a filling material, stirring for one hour, and finally discharging. The paint solves the problems of waterproof layer fracture due to the cracking stress, which is transferred from the basic layer to the waterproof layer, and the accelerated aging due to the flexural fatigue and high stress state of the waterproof layer. Moreover, because of the cohesiveness of the paint, the capillary pores and cracks in the basic layer can be perfectly sealed by the paint, thus the problem of water leaking in the waterproof layer is solved, and the waterproof reliability is greatly improved.

A method for accelerated aging of an automotive catalytic converter under conditions incorporating cold start simulation.

The invention provides a light guide plate and a backlight module. The light guide plate comprises a bottom surface, a light entering surface and a light emitting surface, wherein the light emitting surface is arranged opposite to the bottom surface; the bottom surface comprises a plurality of mesh points; the mesh points comprise fluorescent powder; and scattered particles are added selectively. Phenomena such as color offset caused by accelerated aging of the fluorescent powder which is close to a light-emitting diode (LED) chip and reduction in light emitting efficiency are avoided.

An electrical condition monitoring method utilizes measurements of electrical resistivity of an age sensor (303) made of a conductive matrix or composite disposed in a polymeric structure such as an electrical cable (301). The conductive matrix comprises a base polymer and conductive filler. The method comprises a means for communicating the resistivity to a measuring instrument (317) as a means to correlate resistivity of the conductive matrix of the polymeric structure with resistivity of an accelerated-aged conductive composite.

The invention provides a multi-IGBT quick power circulation accelerated aging device, and the device comprises a plurality of IGBT device aging stations, a heating current source for testing, and a testing current source for testing. The IGBT device aging stations are sequentially connected to form a series structure. The heating current source and the testing current source alternately supply power to the IGBT device aging stations in series connection. The device can achieve the aging testing of a plurality of IGBT devices at the same time, just needs one heating current source and one testing current source, guarantees the homogeneity of testing currents during testing, improves the work efficiency, irons out the defects of testing data in the prior art, greatly improves the accuracy of testing data, guarantees the comparability of the testing data, and guarantees the stability and accuracy of the final testing analysis results of the IGBT devices.

The invention discloses a predicting method of large-size NEPE propellant loading storage life, which includes following steps: (1) performing constant-stress load single-temperature acceleration test, which includes operations of making an NEPE propellant acceleration aging test sample under constant-stress load and performing a single-temperature-stress level temperature acceleration life test; (2) researching the performance change law during an NEPE propellant loading aging process; (3) determining a failure model of the NEPE propellant loading; and (4) carrying out acceleration life tests at different temperatures and under different pressures to predict the large-size NEPE propellant loading storage life. In the method, by means of loading pressure to simulate the self weight on a large-size NEPE propellant during storage, the performance change law of the NEPE propellant under a temperature-pressure double-stress effect. In addition, with tensile strength as a failure parameter, the method of evaluating the NEPE propellant loading storage life is disclosed.

A scanned, pulsed, focused laser irradiation apparatus can measure and image the photocurrent collection resulting from a dose-rate equivalent exposure to infrared laser light across an entire silicon die. Comparisons of dose-rate response images or time-delay images from before, during, and after accelerated aging of a device, or from periodic sampling of devices from fielded operational systems allows precise identification of those specific age-affected circuit structures within a device that merit further quantitative analysis with targeted materials or electrical testing techniques. Another embodiment of the invention comprises a broad-beam, dose rate-equivalent exposure apparatus. The broad-beam laser irradiation apparatus can determine if aging has affected the device's overall functionality. This embodiment can be combined with the synchronized introduction of external electrical transients into a device under test to simulate the electrical effects of the surrounding circuitry's response to a radiation exposure.

The invention provides a pot-type insulator lifetime assessment method based on an artificial accelerated aging test. According to the characterizes of sealing, high temperature and long-time bearing on high voltage of a pot-type insulator, an artificial accelerated aging test platform with electric heating comprehensive factors is designed by means of a multiple-factor laboratory, and characteristic quantities of multiple epoxy resin samples under different degrees of aging are measured. On this basis, analyzing is conducted on test data, by means of an existing empirical formula, a curve-fitting technique and a Weibull probability distribution method are adopted, internal relations among all aging factors, the electrical test quantity and the aging life are researched, relationship is established between the test data of epoxy resin materials and the aging assessment of the pot-type insulator, and the pot-type insulator lifetime assessment method is provided.

The invention relates to a life prediction method based on a lithium-ion battery aging model. The method comprises the steps that (1) the capacity retention ratio of a lithium battery in a 50% SOC state after storage suspension under different temperature and the value, which changes along with storage time, of direct-current internal resistance of the battery are tested; (2) the battery in different voltage states is stored for the same time under the same temperature, and alternating-current impedance testing and direct-current internal resistance testing are performed; (3) the correlation between calendar life capacity attenuation, alternating-current internal resistance changing and direct-current internal resistance changing and temperature and voltage is analyzed, and the changing process of experimental aging data over time is described through a fitting function; and (4) the model is analyzed according to fitted data, measured effective data is fitted, and battery calendar lifeand battery internal resistance parameters in the future are effectively predicted. Through the method, a truthful life state can be inferred from an accelerated aging test, the test method is simple, advanced equipment and complicated operation are not needed, and the test cycle is greatly shortened.

The invention discloses an oiled paper compound insulation electrical ageing test system which comprises an alternating current-direct current high voltage power supply, a high voltage capacitance-resistance divider, an oiled paper insulation sample tank, a partial discharge measuring instrument and an upper computer. The alternating current-direct current high voltage power supply is connected with the oiled paper insulation sample tank. The high voltage capacitance-resistance divider is connected with the oiled paper insulation sample tank. The partial discharge measuring instrument is connected with the oiled paper insulation sample tank, and collects partial discharge signals inside an oiled paper insulation sample. The upper computer is in two-way communication connection with the alternating current-direct current high voltage power supply and the partial discharge measuring instrument. According to the oiled paper compound insulation electrical ageing test system, alternating current-direct current compound voltage is adopted for oiled paper insulation, accurate and accelerated ageing is conducted on a solid insulation paper board, and an oiled paper insulation electrical ageing laboratory test is achieved.

The invention discloses an optimization design method for the storage life of a rubber seal ring. The method includes the steps of conducting the aging acceleration test on a rubber test piece under different installation compression ratios and different temperatures to contain a test curve of the deformation rate and the aging time tau of the rubber test piece, determining A, K and/or alpha through the least square method, determining Z and delta E/R through the least square method, calculating the As value, the value (please see the symbol in the specification) and the Ks value under different installation compression ratios and the storage temperature of Ts, and substituting the values into the formula (please see the formula in the specification) to obtain the aging time tau under different installation compression ratios. By considering the rule of influences of compression ratios on the storage life of the rubber seal ring, the prediction of the life of the rubber seal ring is more accurate; the storage life of the rubber seal ring can be prolonged through optimization design, and guidance is provided for the life design of the seal ring.

The invention discloses a transparent polyurethane coating composite which is composed of a component A and a component B, wherein the component A is polyester polyol, and the component B is polyisocyanate. The transparent polyurethane coating composite is characterized in that polyester polyol comprises aliphatic and cycloaliphatic diacids with a carbon number of C6-C10; polyester polyol is prepared through carrying out condensation polymerization on one or more of aliphatic and cycloaliphatic dihydric alcohols with a carbon number of C2-C7 and one or more of aliphatic polyatomic alcohols with a carbon number of C2-C7, the molecular weight range of the polyester polyol is 500-5000, and the MWD (molecular weight distribution) of the polyester polyol is 1.1-2.1; the component B is polyisocyanate; and the equivalence ratio of reactive groups of polyisocyanate and polyester polyol is (1.1:1)-(2.5:1). The transparent polyurethane coating composite prepared by the method disclosed by the invention is good in impact property and weather resistance, the light transmittance is greater than or equal to 85.0%, and the impact strength is greater than or equal to 70%, and after the transparent polyurethane coating composite is subjected to QUV ultraviolet accelerated aging for a week, the appearance and light transmittance of a coating are not changed. The coating composite prepared by the method disclosed by the invention can be applied to the fields with higher requirements on the coating performance.

The invention provides an uvioresistant polypropylene composition, comprising the following components in parts by weight: 100 parts of polypropylene resin, 1-6 parts of surface-modified nanowires, 0.3-1.0 part of photostabilizer and 0.15-1.0 part of antioxidant. In the preparation method, the polypropylene resin, surface-modified nanowires, photostabilizer and antioxidant are added in a high-speed mixer to mix for 4+/-2 minutes; and melting granulation is carried out at 180-240 DEG C by using a double-screw extruder to obtain the uvioresistant polypropylene material. After the uvioresistant polypropylene material is subject to accelerated ageing for 200 hours with an ultraviolet B (UVB) lamp, the tensile strength retention rate of the component resin (sample wafer thickness of 2mm) is more than 95%, e.g. a flexible freight bag has the advantages of better tensile strength, fracture strength and uvioresistant ageing property. Detection is carried out on the basis of an ASTM (American Society for Testing Material) G154 method, and after a sample is aged for 144 and 200 hours, the fracture strength retention rate of the sample can reach above 70%.

The invention discloses a method for assessing the service life of an AMOLED (active matrix/organic light emitting diode) microdisplay, relating to a method for assessing the service life of an OLED (organic light emitting diode) display. The method comprises the steps of: carrying out an accelerated ageing test of a sample; establishing a brightness decay theoretical model for the accelerated ageing process; analyzing the brightness decay theoretical model; and establishing a service life prediction model so as to calculate the half-life period for assessing the service life.