23 results about "Thermomechanical analysis" patented technology

A thermomechanical analysis apparatus with improved measurement accuracy is proposed. The thermomechanical analysis apparatus (1) includes a sample stage (15) where a sample (S) is placed, a sample tube (11) where the sample stage is placed, the sample tube being fixed to a measurement system, a probe (10) extending in an axial direction (L), one end of the probe (10) coming in direct or indirect contact with the sample (S) to apply a load to the sample (S) and a furnace (12a, 12b) configured to heat the sample, wherein a contact surface of the sample stage with the sample is provided with unevenness.

The thermosetting resin composition contains an epoxy resin containing an epoxy compound represented by formula (1), a curing agent, and an inorganic filler. The glass transition temperature of a thermosetting resin composition in which m is 2 and n is 2 in formula (1), measured at a heating rate of 5°C / min using thermomechanical analysis (TMA), is 190°C or more, and the die shear strength of the thermosetting resin composition to copper at 230°C, measured by the following <Procedure>, is 3.0 MPa or more. <Procedure> The thermosetting resin composition is molded using a low-pressure transfer molding machine at a mold temperature of 175° C, an injection pressure of 10 MPa, and a curing time of 120 seconds, and four 10 mm2 test pieces per level are molded on a copper lead frame. Subsequently, the die shear strength between the test piece and the copper lead frame is measured at 230°C using an automatic die shear measuring device. The die shear strength of the four test pieces is adopted.

A thermomechanical analysis apparatus with improved measurement accuracy when a sample stage is used is provided. The thermomechanical analysis apparatus (1) includes a sample stage (15) where a sample(S) is placed, a sample tube (11) where the sample stage is placed, the sample tube (11) being fixed to a measurement system, a probe (10) extending in an axial direction (L), one end of the probe coming in direct or indirect contact with the sample (S) to apply a load to the sample, and a furnace (12a, 12b) configured to heat the sample, wherein the sample stage and the sample tube respectively include engaging portions (11s, 15E) that engage with each other to position the sample stage.

The present application relates to the technical field of plate performance testing, and particularly relates to a kind of plate edge durability test method;It comprises the following steps: cutting plate sample into standard size test piece;Using thermal mechanical analyzer respectively test the linear expansion coefficient of test piece edge material and base material;The test piece after processing is placed in environmental test chamber and is subjected to cyclic test;Test piece is fixed on load testing device, and constant load is applied along the direction perpendicular to the edge interface of plate plane;Using flatness tester to measure the overall warping of test piece, compare with the warping data before testing, calculate the warping change, evaluate the actual effect of plate balanced laminating process on preventing warping after edge sealing;Using weighted scoring method to calculate the comprehensive score of edge durability;Realize that the long-term durability of plate edge sealing under complex working conditions can be comprehensively and accurately evaluated, and provide scientific and comprehensive technical support for edge sealing process optimization, material selection and structure design.

A laminate having a polypropylene resin film and an inorganic oxide layer, wherein the laminate is characterized in that the water vapor transmission rate is less than 3.0 g / m2 / day, the peel strength of the inorganic oxide layer is 0.7 N / 15 mm or more, and when the stress at 121° C. in the main orientation axis direction as measured by thermomechanical analysis (TMA) is denoted by SF121° C. and the stress at 145° C. in the main orientation axis direction is denoted by SF145° C., said laminate satisfies SF145° C.−SF121° C.≤2.50 MPa. The present invention provides a laminate that is suitable for use in applications in which processing and use in a high-temperature environment are required and there is a need to reduce the effects of moisture.

The present invention provides a thermomechanical analysis apparatus with improved measurement accuracy. The thermomechanical analysis apparatus (1) comprises: a sample stage (15) on which a sample (S) is placed; a sample tube (11) on which the sample stage is placed and fixed to the measurement system; a probe (10) extending along the axial direction (L) and having one end in direct or indirect contact with the sample to apply a load to the sample; and a heating furnace (12a, 12b) for heating the sample, wherein the contact surface of the sample stage in contact with the sample is provided with a concave-convex surface (15p).

The present invention provides a thermomechanical analysis apparatus that improves the measurement accuracy when using a sample stage. The thermomechanical analysis apparatus (1) comprises: a sample stage (15) on which a sample (S) is placed; a sample tube (11) on which the sample stage is placed and fixed to the measurement system; a probe (10) extending along the axial direction (L) and having one end in direct or indirect contact with the sample to apply a load to the sample; and a heating furnace (12a, 12b) for heating the sample, wherein engaging parts (11s, 15E) are respectively provided on the sample stage and the sample tube for positioning the sample stage by engaging with each other.

The application discloses a method for regulating the rejuvenation degree by low-temperature thermal cycle treatment, and steps of the method comprise the following: preparing a La-based amorphous alloy sample with a smooth mirror surface; performing low-temperature thermal cycle treatment on the sample, first placing the sample in liquid nitrogen (77K) and keeping the sample in the liquid nitrogen for a period of time, then quickly transferring the sample to boiling water and keeping the sample in the boiling water, and the time of the two processes is equal, and the total time is one cycle period, the time of each single cycle is controlled and the total keeping time is kept the same to obtain the sample after different cycle frequencies; analyzing the sample after the cycle by means of a nanoindenter, a differential scanning calorimeter and a dynamic thermal mechanical analyzer to obtain hardness, activation volume, relaxation enthalpy and beta relaxation activation energy respectively. The sample with different rejuvenation degrees can be obtained by regulating the cycle frequency, and the rejuvenation degree can reach the maximum at a certain cycle frequency, and the application also provides a new idea and scheme for regulating the rejuvenation degree of the amorphous alloy and improving the mechanical properties of the amorphous alloy.

A thermomechanical analysis apparatus with improved measurement accuracy is proposed. The thermomechanical analysis apparatus (1) includes a sample stage (15) where a sample (S) is placed, a sample tube (11) where the sample stage is placed, the sample tube being fixed to a measurement system, a probe (10) extending in an axial direction (L), one end of the probe (10) coming in direct or indirect contact with the sample (S) to apply a load to the sample (S) and a furnace (12a, 12b) configured to heat the sample, wherein a contact surface of the sample stage with the sample is provided with unevenness (15p).

To provide a thermomechanical analyzer with improved measurement accuracy when using a sample stage. [Solution] A thermomechanical analyzer 1 comprises a sample stage 15 on which a sample S is placed, a sample tube 11 on which the sample stage is placed and which is fixed to the measurement system, a probe 10 extending in the axial direction L with one end of itself in direct or indirect contact with the sample and applying a load to the sample, and heating furnaces 12a, 12b for heating the sample, wherein the sample stage and the sample tube are provided with engaging parts 11s, 15E, respectively, which engage with each other to position the sample stage.

A silver powder is provided that can impart excellent specific resistance and fine conductivity to a conductive paste. For a silver powder, the volume-based cumulative 50% diameter D is... 50 , which is measured by a laser diffraction method, 0.1 µm or more and 1.0 µm or less; a ratio of D 50 to the BET diameter D BET 1.3 or less; and a shrinkage ratio at 200 °C in a thermomechanical analysis of 1% or more.

The present application provides a polyimide film and a method for manufacturing the same, wherein the polyimide film satisfies the following formula (1) in a dimensional change measurement using a thermal mechanical analyzer (TMA) which undergoes a temperature rising process from 25°C to 400°C, and then undergoes a cooling process from 400°C to 25°C. Formula (1) TD direction dimensional measurement value (cooling, 50°C) - TD direction dimensional measurement value (temperature rising, 50°C) < 0 µm.

Provided is a biaxially oriented polypropylene film which, even during heating or even at the time of completion of the heating, contracts little in the width direction thereof. The biaxially oriented polypropylene film is characterized in that: under thermomechanical analysis, when the temperature of the film is raised from 30°C to 160°C at a temperature increase rate of 10°C / minute, with respect to the length X0 of the biaxially oriented polypropylene film in the width direction at 30°C, the temperature at which the length in the width direction becomes 0.9950X0 or less is 129°C or higher; and the clarity is at least 92%.

The invention provides a shape memory strain testing method of a shape memory alloy material, which comprises the following steps of: firstly, acquiring the phase transformation end temperature of the material by a differential scanning calorimetry method, and then respectively preserving heat for a certain time at two constant temperature points which are 5-30 DEG C higher than the austenite phase transformation end temperature and 5-30 DEG C lower than the martensite phase transformation end temperature; measuring the size of the material; and finally calculating the shape memory strain based on the size difference of the two phases. According to the method, a test mode that continuous temperature change is needed in traditional dynamic thermomechanical analysis is abandoned, a two-point measurement method is adopted, the test efficiency is greatly improved, meanwhile, it is ensured that the material is in a pure phase state, and the measurement accuracy is improved; the method is not limited by material forms, is suitable for wires, pipes, plates and special-shaped components, can flexibly select whether to apply loads or not, truly reflects the strain capacity of the materials under actual working conditions, and provides an efficient and reliable test means for performance evaluation and device design of the shape memory alloy.

This application provides a system and method for regulating the hysteretic heat generation of rubber. First, under preset dynamic thermomechanical fatigue test conditions, a correlation model is established between the rubber's loss factor and dynamic heat generation performance, and a target range for loss factor regulation is determined based on the target heat generation performance. Next, based on the target range, the internal structure of the rubber is synergistically regulated by adjusting the rubber's formulation or process to change its loss factor. Then, standard dynamic thermomechanical analysis tests are performed on the regulated rubber samples to obtain its loss factor data, and its predicted heat generation performance is evaluated based on the correlation model. Finally, for rubber samples whose predicted heat generation performance meets the requirements, dynamic thermomechanical fatigue tests are conducted under the preset fatigue test conditions, and the hysteretic heat generation performance is ultimately verified by measured temperature rise or heat generation data. The above scheme can achieve precise regulation of the hysteretic heat generation of rubber.

A porous polymer film according to embodiments of the present disclosure has a crosslinking reactivity of 1.0 or more, as defined by Equation 1. Crosslinkingreactivity=A×B / 10000−C, wherein in Equation 1, A denotes the melt fracture temperature (°C), that is the temperature at which the porous polymer film fractures when stretched under a force of 0.015 N while being heated to 220°C at a heating rate of 5°C / min by thermomechanical analysis (TMA), B denotes the gel content(%), which is the percentage obtained by dividing the mass of the undissolved residual solid after immersing the porous polymer film in xylene at 135°C for 3 hours by the initial mass, and C denotes the high load melt index (HLMI) (g / 10min) measured under conditions of a temperature of 190°C and a load of 21.6 kg according to ASTM D1238 for the porous polymer film.

The utility model provides a kind of for film thermal expansion coefficient test's sample preparation mould, applicable to thermal dilatometer or thermal mechanical analyzer, it is related to film field.This for film thermal expansion coefficient test's sample preparation mould, including mould frame and rectangular cutting table, the inner wall of rectangular cutting table is fixedly connected with square punch body, the top of square punch body is fixedly connected with DC motor, the output shaft of DC motor is fixedly connected with one-way screw rod, the outer circumferential surface of one-way screw rod is connected with the inner wall of threaded slide cylinder with screw thread, the bottom of threaded slide cylinder is fixedly connected with circular punch body.This for film thermal expansion coefficient test's sample preparation mould, by the setting of square punch body, DC motor, one-way screw rod, threaded slide cylinder, circular punch body, position control sliding block, position control track, rectangular cutting table, U-shaped support, electric push rod, can effectively reach the purpose of quick slitting film and the convenient replacement of punching sample preparation shape, enhance the practical effect of this sample preparation mould, and simplify component composition, it is favorable for production, installation.

This invention relates to an intelligent control method and system for inflatable sealing strips. The system acquires ambient air pressure and temperature in real time using onboard sensors and calculates the volume change and pressure shift of the sealing strip under these conditions. Simultaneously, it calculates an environmental compensation coefficient by combining the elastic modulus-temperature curve obtained from dynamic thermomechanical analysis (DMA). Based on the baseline pressure under different operating modes, the system integrates the pressure shift and compensation coefficient to ultimately derive a pressure correction value for the current environment and generates air pressure control commands accordingly. This solution establishes a real-time compensation model of gas state and material properties, dynamically correcting the control target to ensure the accuracy and reliability of the sealing pressure under different climates and altitudes worldwide, thereby guaranteeing the stable implementation of multi-modal energy-saving and comfort control strategies for vehicles.

A thermomechanical analysis apparatus with improved measurement accuracy when a sample stage is used is provided. The thermomechanical analysis apparatus (1) includes a sample stage (15) where a sample (S) is placed, a sample tube (11) where the sample stage is placed, the sample tube (11) being fixed to a measurement system, a probe (10) extending in an axial direction (L), one end of the probe coming in direct or indirect contact with the sample (S) to apply a load to the sample, and a furnace (12a, 12b) configured to heat the sample, wherein the sample stage and the sample tube respectively include engaging portions (11s, 15E) that engage with each other to position the sample stage.

The present invention provides an adhesive resin composition coated electrical steel sheet that can prevent adhesive blocking and deterioration of adhesive performance even when stored for a long period of time after adhesive application and drying, and that can cure the adhesive resin composition coating in a short time during the heat-compression bonding process when manufacturing the iron core. [Solution] An adhesive resin composition coated electromagnetic steel sheet having an adhesive resin composition coating on at least one surface of the steel sheet, wherein the adhesive resin composition coating is a semi-cured product of an adhesive resin composition comprising an adhesive resin and a curing agent, at least in part of which is a thermosetting resin, the maximum penetration λ of the adhesive resin composition coating at 100 to 300°C measured by thermomechanical analysis as described in JIS K 7196:2012 is 3% or more and less than 100%, a portion of the curing agent is present in the adhesive resin composition coating in a crystalline state, and the depolarized light scattering intensity I of the adhesive resin composition coating is 1.00 × 10⁻⁶ 7 ~50.00 x 10 7 This is an electrical steel sheet coated with an adhesive resin composition.

The invention provides a packaging scheme screening method based on chip warping simulation prediction. The packaging scheme screening method comprises the following steps: establishing a chip simulation model based on a conventional packaging structure by adopting a finite element analysis technology; respectively carrying out dynamic thermomechanical analysis test and thermomechanical analysis test on entity samples corresponding to each structure of the model so as to measure core parameters such as viscoelastic parameters and thermal expansion coefficients of the entity samples; inputting parameters required by each structure of the model, setting model constraints and loads, and performing finite element analysis solution; performing a warping test on a prototype sample corresponding to the simulation model, comparing with a simulation result, and calculating whether an error exceeds an allowable threshold; according to the scheme of the ultra-thin packaging structure, an accurate simulation model is established, and simulation is operated; and comparing warping results of the accurate simulation model under different structure-material combinations so as to screen out an optimization scheme for realizing optimal warping suppression of the ultrathin packaged chip. The method is more efficient, the screening efficiency is improved, and the research, development and production requirements of ultrathin packaging chips are met.

A laminate for a secondary battery includes an electrode and a separator that are stacked via an adhesive material. For this laminate, when a value measured for shear peel strength between the electrode and the separator with varying temperature is taken to be A (mN / mm2), a value of maximum heat shrinkage force for the separator determined by thermomechanical analysis is taken to be B (mN / mm2), and a temperature at which heat shrinkage force for the separator determined by thermomechanical analysis decreases to a value (mN / mm2) that is 20% higher than a value (mN / mm2) of heat shrinkage force at 30° C. is taken to be a heat shrinkage end temperature α (° C.), A has a value satisfying A>B in a temperature range of not lower than 25° C. and not higher than the heat shrinkage end temperature α° C.

The invention relates to the technical field of insulation adhesive film testing, in particular to a vehicle FFC insulation adhesive film low-temperature bending testing method which uses a dynamic thermal mechanical analyzer and adopts a double-cantilever mode for testing and comprises the following steps: S1, sample preparation: cutting an insulation adhesive film into rectangular strips; s2, condition setting: temperature, frequency and amplitude conditions of the dynamic thermal mechanical analyzer are set, the frequency is set to be 0.1 Hz, 0.5 Hz, 1Hz, 5Hz and 20Hz, and the amplitude is + / -15 [mu] m; s3, clamping the two ends of the insulating adhesive film obtained in the step S1, applying a load to the middle of the insulating adhesive film, and starting to test according to the conditions set in the step S2 to obtain a storage modulus E ', a loss modulus E' 'and a loss tangent tan delta; and S4, according to the mathematical model corresponding to the data obtained in the step S3, carrying out cracking evaluation, and solving the problems of simple experimental data, no feedback and large subjective judgment error of a traditional thin film low-temperature bending test.