37 results about "Differential thermal analysis" patented technology

The invention relates to a controllable commutation converter valve lightning arrester damping detection method, system, medium and equipment, and the method comprises the steps: sampling a valve plate of a controllable commutation converter valve lightning arrester to be detected to obtain a lightning arrester valve plate sample; carrying out thermal weight loss test on the lightning arrester valve plate sample by the thermogravimetric differential thermal analysis equipment, and drawing a thermal weight loss TG curve; calculating the mass change percentage of the lightning arrester valve plate sample after heating based on a thermal weight loss TG curve; according to the mass change of the brand-new dry valve plate after the thermal weight loss test, comparing the mass change of the lightning arrester valve plate sample with the mass change of the brand-new dry valve plate; and judging whether the lightning arrester valve plate sample is affected with damp or not according to a comparison result.

The application provides a MEMS differential thermal analysis sensor and a DTA / DSC testing method, the sensor comprising a detection thermocouple, a reference thermocouple, an ambient resistance and a shielding ring, wherein the detection thermocouple and the reference thermocouple each comprise a single crystal silicon substrate, a heat insulation cavity, a plurality of single crystal silicon thermocouple pairs and a supporting film, the heat insulation cavity is located in the single crystal silicon substrate, the plurality of single crystal silicon thermocouple pairs are connected in series and are supported by the supporting film to be suspended above the heat insulation cavity to achieve thermal isolation, and the single crystal silicon thermocouple pair comprises an N-type single crystal silicon thermocouple and a P-type single crystal silicon thermocouple connected in series, the temperature and power sensitivity of the sensor are significantly improved, reach 28 mV / K and 100 V / W, and the noise equivalent temperature difference and the noise equivalent power reach 0.5 mK or 0.2 muW. Based on the output signal of the sensor, differential thermal analysis testing and differential scanning calorimetry testing on physical or chemical processes of material heat absorption and release can be realized, the sample consumption is small, and the testing precision is high.

Provided is a bonding material which is capable of forming a silver bonding layer that has good bondability with a material to be bonded, wherein the density (denseness) of the silver is good. The bonding material comprises an organic acid silver salt, an organic solvent, and silver particles. The organic acid silver salt has a weight loss rate (Mr1) of 5% or less when the temperature thereof is raised from 25°C to 200°C and a weight loss rate (Mr2) of 40% or more when the temperature thereof is raised from 200°C to 280°C as determined by simultaneous thermogravimetry-differential thermal analysis (TG-DTA) (in a nitrogen atmosphere at a nitrogen flow rate of 200 ml / min and a heating rate of 10° C / min). The organic solvent contains a compound represented by general formula (1) (in the formula, R1 represents a linear or branched alkyl group having 2 to 6 carbon atoms).　The silver particles include: first silver particles that have an average particle diameter (D50 diameter) of 0.15 μm or more and 0.4 μm or less; and at least one of second silver particles that have an average particle diameter (D50 diameter) of 0.6 μm or more and 1.0 μm or less and third silver particles that have an average particle diameter (D50 diameter) of 1.9 μm or more and 2.4 μm or less.

Provided is a composition for metal sintering with which it is possible to obtain a metal paste that can be sintered at a relatively low temperature.　A composition for metal sintering according to the present disclosure contains an acid that is solid at room temperature and a basic compound, and / or salts thereof, where a mixture composed of the acid that is solid at room temperature and the basic compound is in a uniform liquid state at 60°C or lower. The composition for metal sintering according to the present disclosure preferably is such that the weight loss value (TG) in the temperature range of 100-300°C is at least 80% when a simultaneous thermogravimetric / differential thermal analysis (TG-DTA) measurement is performed under the measurement conditions indicated below. Using 10-20 mg of the composition for metal bonding as a measurement sample, a simultaneous thermogravimetric / differential thermal analysis (TG-DTA) measurement is performed on the measurement sample at a temperature increase rate of 10°C / min and within a measurement temperature range of 30-400°C in an in-furnace air atmosphere.

A carbon material for a catalyst carrier for a solid polymer fuel cell, the carbon material containing a porous activated carbon black satisfying conditions A-C. Condition A: The BET specific surface area is 350 m2 / g or more and 800 m2 / g or less. Condition B: the value VD5-20 / VA20 obtained by dividing the pore volume VD5-20, which is represented by pores having a pore diameter of 5-20 nm (inclusive) as determined by analyzing a nitrogen desorption isotherm using the Dollimore-Heal method, by the pore volume VA20 is 0.35 or less. The pore volume VA20 is represented by pores having a pore diameter of 20 nm or less as determined by analyzing a nitrogen adsorption isotherm using a DH method. Condition C: in a thermogravimetric differential thermal analysis, when the temperature is raised at a rate of 10 DEG C / min in an air atmosphere, the temperature Td10 at which 10% by weight is reduced is 620-680 DEG C.

The talc powder has a B / A value of 0.10 or less when A (m2 / g) is the BET specific surface area and B (mass%) is the weight loss rate as determined by thermogravimetric differential thermal analysis at 200-700 DEG C.

A matting agent for an aqueous coating material according to the present invention comprises wet silica particles and wax that covers the surfaces of the wet silica particles, wherein the wax has a melting point in the range of 85-120 °C and a specific partial heat of fusion of 6% or less, and the matting agent has a BET specific surface area in the range of 50 to 250 m2 / g. The specific partial heat of fusion denotes the ratio of the heat of fusion calculated from the endothermic amount in the range of 40-60 °C with respect to the total heat of fusion calculated from the entire endothermic peak in the differential thermal analysis curve of the wax. The present invention further provides an aqueous coating material comprising said matting agent, and a matting agent production method that enables the production of said matting agent.

To provide a matting agent that is an aqueous matting agent containing wax, excellent in sedimentation stability in the aqueous coating, can suppress elution of wax into a solvent, and excellent in storage stability as powder, an aqueous solution containing the matting agent, and a producing method of the matting agent enabling to produce the matting agent.SOLUTION: The matting agent of the present invention is an aqueous matting agent for paint that contains wet silica particles and a wax that coats the surface of the wet silica particles. The wax has a melting point in the range of 85 to 120°C and a specific partial melting heat of 6% or less. Additionally, the matting agent has a BET specific surface area in the range of 50 to 250 m2 / g. The specific partial melting heat refers to the fraction of the melting heat calculated from the endothermic amount in the range of 40 to 60°C in relation to the total melting heat calculated from the endothermic peaks in the differential thermal analysis curve of the wax.SELECTED DRAWING: None

A film formation method having an excellent mass productivity, whereby a time required for forming a film having a desired thickness is short. In the film formation method, the following steps are performed: atomizing or dropletizing a liquid containing a metal complex, the liquid being raw material solution, conveying resulting mist or droplets to a base by a carrier gas, and forming a metal oxide file on the base by thermally reacting the mist or droplets in the vicinity of the base, the metal oxide film comprising a crystalline oxide semiconductor. A metal complex is used, which shows an exothermic peak at 480° C. to 520° C. in a thermogravimetric-differential thermal analysis at a temperature increase rate of 20° C. / min under an oxygen-containing atmosphere.

A two-step synthesis of SiC including initial exposure of carbon surfaces to Si vapor, followed by Si melt infiltration, is described herein. Interrupted differential thermal analysis (DTA) of amorphous C and Si powder mixtures and microstructure characterization are used to identify the stages of the reaction. Exposure to Si vapor yields a SiC layer with nanoscale porosity driven by the volume change associated with the reaction. This forms a continuous pore network that promotes subsequent melt access to the reaction front with the C. While the pores remain open, the vapor phase reaction proceeds at a nearly-constant rate and exhibits a strong temperature sensitivity, the latter due largely to the temperature sensitivity of the Si vapor pressure. The implications for enhancing the reactive melt infiltration process and fabrication of SiC matrices for ceramic composites are discussed.

Provided is a copper particle that can be used for various applications even after exposure to the atmosphere by itself. A composite copper particle containing a copper particle and an organic component, wherein the composite copper particle has a value of 100 nm or more and 600 nm or less as an average particle diameter measured by a scanning electron microscope, the organic component contains at least a carboxylic acid or a salt thereof and a high-molecular dispersant, the content of the organic component is 0.3 mass% or more and 6.0 mass% or less with respect to the copper particle, the high-molecular dispersant has an acid value of 60 mgKOH / g or more, and the mass reduction rate in the atmosphere when warmed from 30°C to 250°C at a temperature increase rate of 10°C / min is 70% or more using a thermogravimetric differential thermal analysis device.

The application discloses a quantitative statistical method of precipitated phases in a nickel-based high-temperature alloy, and belongs to the field of material microstructure research and analysis. The quantitative statistical method of the nickel-based alloy precipitated phases provided by the application uses a thermodynamic analysis software to obtain a non-equilibrium solidification phase diagram of the alloy, determines the precipitated temperature interval and the precipitated sequence of each precipitated phase in the alloy, uses a DSC differential thermal analyzer to test a heat flow curve of the alloy, uses Origin to divide a precipitated phase spectrum peak of the heat flow curve, and integrates the spectrum peak to obtain a spectrum peak area, namely, the melting enthalpy of each precipitated phase, which represents the content of the precipitated phase in the alloy under different process conditions; comparison of the spectrum peak areas of the precipitated phases obtains the mass change of each main precipitated phase in the alloy before and after the process. The analysis process of the application is convenient and fast, the result is accurate, excellent effects are achieved in processing some complex eutectic phases, and the application has a very wide application prospect in nickel-based alloys and other metal materials.

This invention provides a method for determining the nucleation time of a glass-ceramic, comprising: testing the differential thermal analysis (DSC) curve of a precursor glass to obtain the glass transition point Tg and the crystallization peak position Pc; selecting a nucleation temperature Tn and a crystallization temperature Tc, wherein Tn ranges from Tg to Tg+150℃ and Tc ranges from Pc-60℃ to Pc+60℃; performing DSC tests on the precursor glass at different times under heat treatment at Tc, and setting the time corresponding to the complete disappearance of the crystallization peak on the DSC curve as the crystallization time tc; preparing the glass-ceramic, wherein the precursor glass is first heated to Tn and held at that temperature, and then heated to Tc and held at that temperature for tc; testing the DSC curve of the glass-ceramic obtained in step 4, and calculating the integral area of ​​the corresponding endothermic peak on the DSC curve; gradually extending the nucleation time, repeating steps 4-5, and when the change in the integral area of ​​the endothermic peak on the DSC curve is less than a preset value, the corresponding nucleation time is the optimal nucleation time tn. This invention can quickly and accurately determine the shortest time required to reach the nucleation limit.

The application provides a method for evaluating the influence of adding a composite flux on the combustion performance of pulverized coal, and belongs to the field of blast furnace ironmaking. Fe2O3 and CaO are mixed to obtain a composite flux, the composite flux is mixed with pulverized coal to obtain a to-be-tested mixed sample, differential thermal analysis is used to test the to-be-tested mixed sample, combustion characteristic parameters are obtained, and an ignition index and a comprehensive combustion characteristic index are calculated. Based on the calculated ignition index and comprehensive combustion characteristic index, a composite flux combustion performance index of the pulverized coal is constructed and calculated, which is used for quantitatively evaluating the influence of the composite flux on the combustion performance of the pulverized coal. Based on the two key indexes of the ignition index and the comprehensive combustion characteristic index, the application can accurately and objectively evaluate the promotion or inhibition effect of the composite flux on the combustion performance of the pulverized coal, reveal the synergistic and antagonistic action mechanism of the composite flux, optimize the process parameters of the blast furnace injection of the pulverized coal, and improve the resource utilization rate.

Disclosed is a resin composition which contains: a polymer (A) that has an ethylenically unsaturated double bond, and has a weight average molecular weight (Mw) of 1,500-500,000; and a compound (B) that has two or more groups represented by formula (Y) and satisfies conditions (α1), (α2), and (α3). In formula (Y), R31 represents a hydrogen atom or an alkyl group having 1-5 carbon atoms, and * represents a bond with another moiety in the compound (B). (α1) The molecular weight is 1,000 or less. (α2) The solubility in toluene at 25°C is 20 mass% or more. (α3) The 1% weight loss temperature is more than 130°C as determined by simultaneous thermogravimetric-differential thermal analysis (TG / DTA).

The invention discloses a method and system for evaluating the grain size of an invar alloy forge piece, and the method comprises the following steps: S1, designing heat treatment process parameters based on differential thermal analysis data of an invar alloy and a precipitated phase evolution rule obtained by a scanning electron microscope, and preparing invar alloy samples with different grain sizes; s2, detecting by an ultrasonic longitudinal wave vertical incidence method, and extracting a frequency domain characteristic value of an ultrasonic signal; s3, the microstructure morphology of the invar alloy sample is obtained, and a twin crystal feature recognition strategy is established in combination with the precipitated phase morphology; s4, obtaining an influence rule of microstructure change of the invar alloy sample in a tissue evolution process on the frequency domain characteristic value, and researching a mapping rule between an ultrasonic signal and a defect depth; and S5, constructing an ultrasonic time-frequency domain multi-feature fusion evaluation model for the grain size and the macroscopic defect of the invar alloy. The method solves the problem that an existing linear model with a single ultrasonic parameter is difficult to accurately characterize the grain size change of the invar alloy.

This aluminum alloy forging material has an alloy composition which contains Cu within a range of 0.25-0.55 mass%, Mg within a range of 0.85-1.25 mass%, Si within a range of 1.02-1.4 mass%, Mn within a range of 0.55-1.0 mass%, Fe within a range of 0.32-0.65 mass%, Zn within a range of 0.25 mass% or less, Cr within a range of 0.050-0.30 mass%, Ti within a range of 0.01-0.1 mass%, B within a range of 0.0010-0.030 mass%, and Zr within a range of 0.0010-0.050 mass%, and in which the ratio Fe / Mn of the Fe content with respect to the Mn content is 0.3-1.1, and the remaining portion is Al and unavoidable impurities. In a thermal analysis curve obtained by performing a differential thermal analysis (DSC) on the aluminum alloy forging material, exothermic peaks emerge within 200-300°C and within 400-500°C.

The utility model relates to the technical field of plastic particles, and discloses performance detection equipment for corrosion-resistant plastic particles, which comprises a differential thermal analyzer and a protection component, and the differential thermal analyzer comprises a shell, a machine body, a container and a plurality of ventilation holes. Through the arrangement of structural components such as the differential thermal analyzer, the shell and the machine body, the performance of corrosion-resistant plastic particles can be detected through the differential thermal analyzer, the container can be protected through the protection assembly, dust adsorbed at the air exchange holes can be reduced through the dust removal assembly, and a dust removal net can be conveniently disassembled or fixed through the positioning assembly; the two protective shells can be fixed or opened after being combined through the connecting assembly, so that the effects that the container is protected, and the shells do not need to be frequently disassembled to clean the air exchange holes are achieved, and the problems that the protective effect of the differential thermal analyzer on the container is not good enough, the shell of the differential thermal analyzer needs to be periodically disassembled to clean dust at the air exchange holes, and the cost is low are solved. The disassembly and assembly of the shell and the container are time-consuming.

The invention discloses a full-automatic anti-explosion differential thermal analyzer and a testing method, and belongs to the technical field of thermal safety performance testing of energetic materials. The instrument integrates intrinsically safe anti-explosion design, direct contact type temperature measurement and intelligent temperature control functions; a double-layer anti-explosion structure is adopted, and a buffer medium is filled between the heating cabin and the protective shell, so that explosion impact can be effectively absorbed; the peripheral heat shielding layer is provided with a water circulation channel, and efficient heat dissipation is achieved; the temperature measuring system directly contacts with a sample through a sensor, so that the response speed and precision are improved; the automatic lifting unit is linked with the control system and can quickly move away the sample and realize active explosion suppression according to a program; according to the matched method, the reaction activation energy critical temperature (Ea-Ta) of the energetic material can be accurately measured, and the thermal stability critical point is quantitatively analyzed through a dynamic temperature tracking algorithm and an Arrhenius equation extrapolation method; the device solves the problems of poor safety and low data accuracy when traditional equipment is used for testing high-risk materials, and is suitable for thermal safety evaluation of materials such as gunpowder and explosives.

A barrier film provided with a base material layer containing a polypropylene resin, an anchor coat layer, and an inorganic oxide layer in this order. The substrate layer has a contact layer in contact with the anchor coating. When the softening temperatures of the anchor coating and the contact layer are determined by local thermal analysis, the softening temperature T1 of the contact layer is lower than the softening temperature T2 of the anchor coating.

To provide a raw material for a mold release film capable of obtaining good appearance while reusing a used mold release film.SOLUTION: The raw material (M) for a release film of the present invention uses a used release film (y) as a raw material, and has an oxidation starting temperature (Ts) of 120 °C or higher and 350 °C or lower, which is obtained when the temperature is raised from 25 °C at a rate of 5 °C / min in air in a thermogravimetric differential thermal analysis (TG-DTA analysis) of the raw material (M) for a release film.SELECTED DRAWING: None

The present invention provides: a paste for bonding, which exhibits high thermal conductivity by suppressing voids in a coating film after sintering under a non-pressurized condition and / or under a pressurized condition, and which has excellent bonding strength and is capable of suppressing a decrease in the bonding strength due to a thermal cycle; and a bonded body which is obtained by using the paste for bonding.　The above problem is solved by a paste for bonding, which contains metal particles (A) and a dispersion medium (B), wherein if the paste for bonding is heated from 30°C at a heating rate of 3°C / min and the weight loss M650 as measured by a thermogravimetric-differential thermal analysis device is taken as 100, the weight loss M200 is 88.0 to 98.0 inclusive, and at least one of (1) the average particle diameter of the metal particles (A) is within a specific range, and (2) the weight loss M100, M150, and M250 are each within a specific range, is satisfied.

The invention discloses a ceramic raw material thermal performance evaluation system based on differential thermal analysis, and the system comprises a differential thermal analyzer which is used for collecting differential thermal curve data of a ceramic raw material; the data processing module is used for carrying out noise filtering processing, baseline correction processing and data normalization processing on the differential thermal curve data to obtain a target differential thermal curve; the feature extraction module is used for performing feature extraction on the target differential thermal curve to obtain feature parameters; and the evaluation module is used for performing thermal performance evaluation on the ceramic raw materials according to the characteristic parameters. Differential thermal analysis data can be comprehensively, accurately and efficiently integrated and analyzed, and the thermal stability of the ceramic raw material is accurately evaluated.

This aluminum alloy forging billet has the following alloy composition: Cu in the range of 0.25% to 0.55% by mass, Mg in the range of 0.85% to 1.25% by mass, Si in the range of 1.02% to 1.4% by mass, Mn in the range of 0.55% to 1.0% by mass, Fe in the range of 0.32% to 0.65% by mass, Zn in the range of 0.25% to 0.050% to 0.30% by mass. The Fe content relative to Mn content is 0.3 to 1.1 by mass, with the balance consisting of Al and unavoidable impurities. The Fe / Mn ratio is 0.3 to 1.1 by mass. The Fe content relative to Mn content is 0.3 to 1.1 by mass. The balance consists of Al and unavoidable impurities. In the thermal analysis curve obtained by differential thermal analysis (DSC), exothermic peaks are generated in the range of 200 to 300 °C and 400 to 500 °C, respectively.

The application discloses a method for synthesizing fluorocarnotite monocrystal under high temperature and high pressure and belongs to the technical field of mineral monocrystal sample synthesis. The synthesis method comprises the following steps: HoCl3, NaF and Na2CO3 are mixed according to a stoichiometric molar ratio, and a reaction is carried out under high-pressure and gradient temperature rising, so that fluorocarnotite monocrystal is prepared. The fluorocarnotite monocrystal prepared by the method has large particle size, can fully meet the sample demand of simulation experiments such as sample monocrystal X-ray diffraction, Raman spectrum, infrared spectrum and differential thermal analysis, and breaks through the technical bottleneck of the synthesis of fluorocarnotite monocrystal of heavy rare earth.

The present invention relates to the technical field of titanium alloys, and discloses a method for preparing an α-titanium alloy sheet having a high deformation twin density. The method comprises: adding sponge titanium, aluminum shot, titanium diboride, Ti-32Fe and titanium dioxide, which act as raw materials, into a smelting furnace, and performing three instances of vacuum arc remelting to obtain an ingot; measuring the phase transition point Tβ of a Ti-Al-B-based alloy by means of a differential thermal analysis method, and performing two-heat hot rolling on the ingot to obtain a slab; and heating the slab to a temperature of Tβ, maintaining the temperature for the first time, then cooling same with water, reheating the slab to a temperature of (Tβ-200)°C, maintaining the temperature for the second time, and then air-cooling same to room temperature, so as to obtain a sheet. In the present invention, a sheet having a high deformation twin density is prepared by, with respect to a Ti-Al-B-based α-titanium alloy, using a design involving increasing the β-stabilizing element Fe and microalloying the element, performing three instances of vacuum arc remelting, and using a three-heat hot rolling process involving direct-rolling cogging and a high deformation per pass. The structural uniformity and the strength-toughness balance of the alloy are ensured at low costs.

Disclosed is an exterior material for a power storage device, the exterior material being formed of a multilayer body that includes at least a barrier layer and a thermally fusible resin layer in this order. The barrier layer is composed of a cladding material. The cladding material includes at least a first metal layer that constitutes a surface on the thermally fusible resin layer side and a second metal layer that constitutes a surface opposite to the thermally fusible resin layer-side surface. The first metal layer is an aluminum layer that is formed of aluminum or an aluminum alloy. With respect to the TG-DTA differential thermal analysis of the cladding material, an endothermic peak due to melting is present at 1,000°C or higher, and no weight change occurs at the temperature at which the endothermic peak is present.

The utility model belongs to the technical field of sample cutting, and discloses a differential thermal analysis sample cutter which comprises a push rod (1), a handle (2), a cutting knife and a base plate, the cutting knife is in a long cylinder shape, a handle (2) is fixedly arranged at the upper end of the cutting knife, and a knife point is arranged at the lower end of the cutting knife for cutting a wafer. The push rod is in a long rod shape, the diameter of the push rod is smaller than the inner diameter of the cutting knife (3), the lower end of the push rod (1) is inserted into the cutting knife (3), a top cover is fixed to the upper end of the push rod (1), the push rod (1) is sleeved with a spring, one end of the spring makes contact with the handle, and the other end of the spring makes contact with the top cover. And the base plate (4) is arranged below the cutting knife (3) and is used for supporting a sample. According to the utility model, errors caused by different operators during sample cutting are avoided, cutting is convenient and fast, consistent appearance, consistent weight and consistent flatness of detected samples are ensured, and the reproducibility and accuracy of analysis and detection are improved.

A negative electrode material for a nonaqueous secondary battery which contains a graphite that contains an amorphous carbonaceous material in at least a part of the surface; has a cumulative pore volume of 0.100 mL / g or less in a pore size range of 0.01 μm to 1 μm; and satisfies at least one of the following conditions (1) and (2) in a DTA curve obtained by differential thermal analysis (DTA) in an air stream: (1) the negative electrode material has no exothermic peak in a temperature range of 550° C. to 650° C.; and (2) the negative electrode material has an exothermic peak in a temperature range of 550° C. to 650° C., and the area of the exothermic peak is larger than 0 μV·s / mg but 90 μV·s / mg or smaller; a negative electrode for a nonaqueous secondary battery, which contains the same; and a nonaqueous secondary battery are provided.

This application belongs to the field of thermal measurement and analysis technology, specifically relating to an integrated quantitative dual-channel differential thermal analysis chip. It includes a loading unit with a first bearing region on one side of the front for placing and limiting the volume of the sample, and a second bearing region for forming a control group with the first bearing region. A functional unit is formed on the back of the loading unit, including a heating unit for providing heat input to the first and second bearing regions, a temperature measuring unit for detecting the temperatures of the first and second bearing regions, and a thermal analysis unit for detecting the thermal effect of the sample. This application integrates the loading unit with the first and second bearing regions and the functional unit onto a single chip, achieving quantitative loading of the sample and interference-resistant analysis of the thermal effect, thus solving the technical problems of difficult quantitative loading and poor interference resistance in existing technologies.