249 results about "Differential thermal analysis" patented technology

In a magnetic recording disk 1 including a magnetic layer 12, a protective layer 13, and a lubricating layer 14, the lubricating layer 14 is made from a lubricant prepared from a composition. The weight change of the lubricant ranges from −20% to −50% at 300° C. in the case where the lubricant is subjected to thermogravimetric analysis in such a manner that the lubricant is heated from 40° C. to 500° C. at a heating rate of 10° C./min. The lubricant has a maximum peak at about 300° C. in the case where the lubricant is subjected to differential thermal analysis in the same manner as described above. The lubricant can be quantitatively measured for heat resistance. Therefore, a magnetic recording disk exhibiting stable performance at high temperatures and a method for manufacturing such a magnetic recording disk can be obtained.

A high-density optical disk comprises a transparent substrate having a guide groove having a depth of 100 to 200 nm, width of 0.2 to 0.4 mum arranged with a track pitch of 0.7 to 1.0 mum. A recording layer is made of an organic pigment exhibiting a specific main weight reduction in a thermogravimetric analysis and a specific exothermic peak in a differential thermal analysis.

A negative electrode material for non-aqueous electrolyte secondary batteries, which is best suited for large current I/O non-aqueous electrolyte secondary batteries represented by those for hybrid electric vehicles (HEVs), which are unlikely to be influenced by the deterioration of battery characteristics due to water, and a production process thereof are provided.

The negative electrode material having at least one exothermic peak in the range of not lower than 650° C. and lower than 700° C., and at least one exothermic peak in the range of not lower than 700° C. and lower than 760° C., in differential thermal analysis measured under an air flow. The production process of the negative electrode material for non-aqueous electrolyte secondary batteries is characterized by carbonizing a negative electrode material precursor having an oxygen content of not less than 5% by weight and less than 10% by weight, under an inert gas flow at a rate of not more than 120 ml/g·h, under a pressure of normal pressure to 10 kPa, at a temperature higher than 1100° C. and lower than 1500° C.

Disclosed is an additive for a plastic, comprising fine particles obtained by calcination and slaking of a dolomite which exhibits two endothermic peaks in the differential thermal analysis, said fine particles containing calcium carbonate, magnesium carbonate, magnesium oxide, calcium hydroxide and magnesium hydroxide as main chemical components and also containing an ignition loss component in an amount of 10 to 40% by weight based on the weight of said fine particles. A plastic hating hydrogen chloride scavenging properties and antimicrobial properties imparted by incorporating the additive for a plastic is also disclosed.

Provided are SiO₂—Al₂O₃-based or Li₂O—Al₂O₃—SiO₂-based crystallized glass that solves the cause of cracking and fracture in forming it into large-size shaped articles, that has homogeneous inner quality and that may be produced stably at high efficiency; and a method for producing it. The crystallized glass contains components of SiO₂ and Al₂O₃, wherein the crystal precipitation peak temperature width obtained in differential thermal analysis of amorphous glass, a precursor thereof, is at least 22° C. Preferably, the total amount of the TiO₂ component and the ZrO₂ component in the crystallized glass is within a range of from 3.0 to less than 4.3%. FIG. 1 is referred to.

The objective of the present invention is to provide a chromatic coloring agent for multicolor laser marking, capable of forming clear markings having two or more different color tones when two or more laser beams having different energy levels are irradiated onto different places of a molded article, a composition for multicolor laser marking, for example, capable of forming a chromatic marking derived from the chromatic coloring agent and a white marking on the surface of a molded article whose base color is black or dark-color based color, a laser marking method, a multicolor-marked molded article and the like. The present chromatic coloring agent has an exothermic peak in the range of 360° C. or higher and 590° C. or lower, as measured by differential thermal analysis. The present laser marking composition comprises a chromatic coloring agent, a black substance (carbon black or the like) which is itself depleted or discolored by receiving a laser beam, and a polymer, and the contents of the chromatic coloring agent and the black substance are respectively 0.001 to 3 parts by mass and 0.01 to 2 parts by mass with respect to 100 parts by mass of the polymer.

The invention relates to a method for preparing spherical iron phosphate for lithium iron phosphate cell material. In the method, sheet iron, scrap iron, inorganic ferric salt, oxide of ferrum or organic iron is used for preparing ultra-pure high-density spherical iron phosphate for lithium iron phosphate cell material. Iron phosphate products produced by using the method have high main content of over 99.5%, extremely low impurity content, high dispersibility and high flowability, and oscillation ratios are all higher than 0.95; size distribution is in a narrow range, wherein D50 is stabilized at about 3 mum; the shapes of the products are shown to be sphere-like under an SEM (Scanning Electron Microscope), XRD (X-Ray Diffraction) also shows that the obtained iron phosphate products are pure phases, namely iron phosphate products with dehydrate structures. TG-DTA (Thermal Gravimetric-Differential Thermal Analysis) proves that iron phosphate produced by using the method disclosed by the invention is standard iron phosphate with two crystal waters.

The invention provides a Al-Mg aluminum alloy board with a fewer tensile strain marks, and an excellent shaping property. The aluminum alloy board is exerted with a definite prestrain in advance and then is molded by extrusion, and the board has a certain amount of Mg, and the heat absorption peak value height of the heating curve between 100-150 DEG C. from solid phase obtained in the heat changeduring the board melting process determined by the differential thermal analysis is above 28 muW/mm<3>, thereby inhibiting tensile strain marks during extrusion molding under a rigor shaping condition.

This invention provides an electromagnetic steel sheet, which, after lamination, can be bonded by pressing and heating, can realize strain relieving annealing, and has a surface covered with a heat resistant adhesive insulating film, an iron core using the electromagnetic steel sheet, and a process for manufacturing the same. The electromagnetic steel sheet is covered with a heat resistant adhesive insulating film comprising a resin, which softens at room temperature or above and 300 DEG C or below, and a low-melting inorganic component having a softening temperature of 1000 DEG C or below asmeasured by a differential thermal analysis method. A strain relieving annealable bonded fixed iron core is provided by stacking this electromagnetic steel sheet and conducting press fixation.

The invention provides a dexrabeprazole sodium monohydrate crystal form. The invention is characterized in that the dexrabeprazole sodium monohydrate crystal form has characteristic diffraction peaks at 10.5, 13.4, 17.1, 18.0, 18.5, 18.9, 19.5, 23.0, 23.3, 27.1 and 31.6 degrees in an X-ray powder diffraction spectrum represented by Cu-Kalpha radiation and 2theta; and an absorption peak exists at about 148.27 DEG C in a differential thermal analysis atlas of the dexrabeprazole sodium monohydrate crystal form. The crystal form has relatively high stability, solubility and dissolution, and relatively low hygroscopicity. The invention also provides a preparation method for the dexrabeprazole sodium monohydrate crystal form. The preparation method is simple, high in yield and low in preparation cost, and the quality of products is high.

A device and method for investigating phase transformation properties and structural changes of materials. In one form, the device simulates actual thermal processing conditions, while the method can be used in both simulations as well as in actual processing conditions. An analysis using at least one of the device and method is referred to as a single sensor differential thermal analysis, as it compares the temperature recorded in a measured specimen against a reference thermal history without requiring the derivation of the reference thermal history from measured reference temperatures.

The invention discloses a stable ivabradine hydrochloride crystal (formula I), which is verified by a DCS differential thermal analysis chart, a melting point and an X-ray powder diffraction diagram. By adopting the method, the ivabradine hydrochloride crystal (formula I) prepared by the method is very stable to temperature, illumination and humidity, thus being favorable for long-term storage. The solvent used in the crystal is safe, and is easy to be removed; therefore, the stable ivabradine hydrochloride crystal is applicable to industrialized production.

The invention provides an oxide semiconductor layer that has less cracks and is excellent in electrical property and stability, as well as a semiconductor element and an electronic device each including the oxide semiconductor layer. The invention provides an exemplary method of producing an oxide semiconductor layer, and the method includes the precursor layer forming step of forming, on or above a substrate, a layered oxide semiconductor precursor including a compound of metal to be oxidized into an oxide semiconductor dispersed in a solution including a binder made of aliphatic polycarbonate, and the annealing step of heating the precursor layer at a first temperature achieving decomposition of 90 wt % or more of the binder, and then annealing the precursor layer at a temperature equal to or higher than a second temperature (denoted by X) that is higher than the first temperature, achieves bonding between the metal and oxygen, and has an exothermic peak value in differential thermal analysis (DTA).

The invention discloses a heat treatment process of nickel base single crystal superalloy. A differential thermal analysis method and metallographic test method are used to determine the incipient melting temperature of the alloy at 1280 DEG C; and an optical metalloscope is used for observation of the microstructure of alloy after different solid solution treatments, and the stress rupture properties of the alloy are tested. The results show that optimum heat treatment process of the alloy is as below: 1245 DEG C / 2h, AC+1275 DEG C / 4h, AC+1100 DEG C / 2h, AC+850 DEG C / 24h, AC. The single crystal superalloy treated by the process has excellent durability, and creep rupture life reaching 159.35h under 980 DEG C and 235MPa.

The invention discloses a polycrystal form A1 and a polycrystal form A2 of ulipristal acetate (formula I) free of solvate and a preparation method, a pharmaceutical composition and medical application of the polycrystal forms. By verification of melting point, X-ray diffraction powder spectrum (XRD), infrared spectrum (IR), differential thermal analysis spectrum (DSC) and thermogravimetric spectrum (TG), the polycrystal form A1 and polycrystal form A2 of ulipristal acetate prepared by the method disclosed by the invention are extremely stable to temperature, illumination and humidity, and favorable to long-term storage; the used crystallizing solvent is safe and easy to remove; the obtained polycrystal form A1 and the polycrystal form A2 can be directly used for preparation processing; and the preparation method is simple in operation and suitable for industrial production. The formula I is shown in the description.

The invention relates to a thermal analysis method for measuring the contents of polydimethylsiloxane (PDMS), SiO2 and aluminum hydroxide (ATH) in a silicone rubber composite insulator. The method comprises the steps of S1, respectively measuring the thermal gravity loss (TG) curves of the PDMS, the ATH and the SiO2 for three times by a thermal gravity loss-differential thermal analysis combination comprehensive thermal analyzer, and averaging; S2, cutting three parts from the silicone rubber insulator randomly, wherein the cut parts have the sizes of 1cm*1cm and the masses within the range of 5-50mg; pretreating, then measuring the TG curves of the silicone rubber insulator for three times, and averaging; S3, calculating the thermal weight loss rates of the PDMS, the ATH, the SiO2 and the silicone rubber insulator in the ranges of 20-360 DEG C and 360-700 DEG C according to the TG curves; S4, substituting the obtained numerical values into the formula delta M=(m(ATH)*deltam(ATH)+m(PDMS)*delta m(PDMS)+m(SiO2)*delta m(SiO2))/(m(ATH)+m(PDMS)+m(SiO2)); and S5, working out the equation in the S4, and calculating the contents of the ATH and the SiO2 relative to the PDMS. According to the method, the contents of the three components of the silicone rubber composite insulator can be worked out by utilizing the thermal weight loss rates of the three components in the respective specific thermal decomposition temperature ranges, and a concrete calculation method is provided.

Provided are a crystalline resin cured product which shows high thermal conductivity, low thermal expansion, high heat resistance, low moisture absorption, and good gas barrier properties and a crystalline resin composite material produced therefrom. Further provided is a method for producing the crystalline resin cured product and the crystalline resin composite material. The crystalline resin cured product is obtained by the reaction of an aromatic diglycidyl compound or a diglycidyl resin with an aromatic dihydroxy compound or with a dihydroxy resin and it shows a heat of melting of 10 J/g or more in differential thermal analysis while the endothermic peak corresponding to the melting appears in the range of 120 to 320° C. The crystalline resin composite material is obtained by combining the crystalline resin cured product with a filler or a base material. The crystalline resin cured product has a unit represented by -A-O—CH₂—CH(OH)—CH₂—O—B—, wherein A and B are divalent aromatic groups.

The invention relates to a preparation method of a solar energy power generation heat-preserving material such as Al-Si alloy in which percentage of Si is 12.07. The new energy-storing material, namely the aluminium-silicon alloy, is mainly applied to solar energy power generation to store heat, so that new energy is reasonably used. In the Al-Si alloy in which percentage of Si is 12.07, AlTi10 intermediate alloy and a phosphor salt serve as a composite alterant and commercial-purity aluminium of which the mass fraction is 99.9 percent and crystal silicon of which the mass fraction is 99.7 percent serve as substrates to prepare the new energy-storing material according with use of solar energy power generation. Results of metallographic analysis and differential thermal analysis show that: in the alloy subjected to composite modification of phosphor and AlTi10, the coarse block and stripe primary crystal silicon is obviously reduced, the edges and corners are passivated, and the relatively big needlelike eutectic silicon becomes particles. Composition segregation appearing when the traditional material is subjected to smelt-solidification circulation for about 1,000 times at the temperature of between 480 and 620 DEG C is improved and the utilization rate of new energy is improved.

A balance for a simultaneous differential thermal analysis instrument that combines gravimetric measurements with measurements that require propagation of electrical signals from the sample holder to an apparatus for recording the electrical signals. In one embodiment of the present invention, conductive cross-flexure pivots are used in a parallel guided balance to mechanically and electrically couple the components of the balance mechanism to the apparatus that records the electrical signals.