16 results about "Differential thermal analysis" patented technology

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.

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.

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.

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.

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 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.

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.

To provide an aluminum alloy material having excellent brazing properties, which can be manufactured using raw materials such as waste materials generated during the manufacturing process of clad materials, waste materials from aluminum alloy heat exchangers, and recycled materials collected from the market. [Solution] The aluminum alloy material contains, relative to the total mass of the aluminum alloy material, 1.1 to 1.6 mass% Si, 0.1 to 0.8 mass% Fe, 0.8 to 2.0 mass% Mn, 0.3 to 0.8 mass% Cu, 0.2 to 0.5 mass% Zn, 0.5 mass% or less Mg, 0.5 mass% or less Ti, and the balance being Al and unavoidable impurities. The aluminum alloy material also has a heat of fusion of 3.0 μV·s / mg or less, calculated from an endothermic peak occurring in the range of 550 to 600°C based on a differential thermal analysis curve with a heating rate of 40°C / min.

A molding material capable of utilizing biomass and heating to a higher temperature than conventional materials during the molding process is provided, along with a molded article and a method for producing said material. The molding material, according to one embodiment of the present invention, utilizes biomass obtained from organic matter with a water content of at most 20%, a mesophilic aerobic bacteria count of at most 10⁵ / g, and a maximum exothermic peak detected at 300°C or higher by differential thermal analysis. Since the biomass used has a maximum exothermic peak detection temperature by differential thermal analysis higher than that of conventional biomass materials, the molding material can be heated to a higher temperature than conventional materials during the molding process.