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7118 results about "Thermal shock" patented technology

Thermal shock occurs when a thermal gradient causes different parts of an object to expand by different amounts. This differential expansion can be understood in terms of stress or of strain, equivalently. At some point, this stress can exceed the strength of the material, causing a crack to form. If nothing stops this crack from propagating through the material, it will cause the object's structure to fail.

Electrochemical method of producing nano-scaled graphene platelets

A method of producing nano-scaled graphene platelets with an average thickness smaller than 30 nm from a layered graphite material. The method comprises (a) forming a carboxylic acid-intercalated graphite compound by an electrochemical reaction which uses a carboxylic acid as both an electrolyte and an intercalate source, the layered graphite material as an anode material, and a metal or graphite as a cathode material, and wherein a current is imposed upon the cathode and the anode at a current density for a duration of time sufficient for effecting the electrochemical reaction; (b) exposing the intercalated graphite compound to a thermal shock to produce exfoliated graphite; and (c) subjecting the exfoliated graphite to a mechanical shearing treatment to produce the nano-scaled graphene platelets. Preferred carboxylic acids are formic acid and acetic acid. The exfoliation step in the instant invention does not involve the evolution of undesirable species, such as NOx and SOx, which are common by-products of exfoliating conventional sulfuric or nitric acid-intercalated graphite compounds. The nano-scaled platelets are candidate reinforcement fillers for polymer nanocomposites. Nano-scaled graphene platelets are much lower-cost alternatives to carbon nano-tubes or carbon nano-fibers.
Owner:GLOBAL GRAPHENE GRP INC

Resin composition, method of its composition, and cured formulation

It is an object of the present invention to provide a resin composition which can form cured formulations having various excellent properties such as an insulating property, thermal shock resistance, moldability / formability and strength, and exhibit an excellent appearance in which transparency is enhanced, a resin composition whose cured thin film has excellent flame retardancy, good mechanical property and heat resistance, a dispersing element containing an inorganic microfine particle which can give a flame retardancy to a resin, to which the inorganic microfine particle is added, and can reduce a hygroscopic property to the extent possible, a method for producing the same and a cured formulation obtained by using the resin composition. The present invention relates to a resin composition comprising a compound having at least one of a glycidyl group and / or an epoxy group and an inorganic microfine particle, a resin composition comprising three components of a phenolic compound, a compound having at least one of a glycidyl group and / or an epoxy group and an inorganic microfine particle, a flame retardant resin composition comprising a polyhydric phenol and an inorganic microfine particle, and a dispersing element containing an inorganic microfine particle obtained by a hydrolysis condensation reaction of alkoxide and / or metal carboxylate in a dispersion medium.
Owner:NIPPON SHOKUBAI CO LTD

Method with functions of preheating and postheating for forming crack-free coating with high efficiency by three-light-beam laser-cladding technique

The invention discloses a method with functions of preheating and postheating for forming crack-free coating with high efficiency by a three-light-beam laser-cladding technique. The method comprises the following steps of: splitting a laser beam emitted by an Nd: YAG laser into two laser beams by using a laser beam splitter, namely a preheating laser beam for preheating the surface of a base material and a postheating laser beam for postheating the formed coating; then blowing alloy powder into a molten pool which is formed by focusing a laser beam emitted by a CO2 laser and acting the focused laser beam on the surface of the base material by using a powder nozzle, wherein after the CO2 laser beam moves away, a molten layer is cured and crystallized quickly to form the coating; and postheating the formed coating by adopting the postheating laser beam. The method has the advantages that: (1) the dilution rate of the coating is low and adjustable, and the coating is metallurgically combined with the base material, so the base material has a small thermal influence area and is deformation-free and crack-free; (2) residual inner stress in the coating can be eliminated effectively, a tissue can be improved, and the coating has high abrasion resistance, high corrosion resistance, high anti-cracking performance and high thermal shock resistance; and (3) relative to the processing efficiency in the conventional laser cladding technology, the processing efficiency in the method can be improved by 50 times to the maximum extent, so the processing cost is reduced greatly, and a large-scale industrialized application potential is realized.
Owner:NANCHANG HANGKONG UNIVERSITY

Multielement rare earth oxide doped zirconia thermal barrier coating with craze crack structure and preparing method thereof

The invention discloses a method for preparing a rare earth oxide doped zirconia thermal barrier coating with a craze crack structure, which solves the problems of low thermal shock resistance property, difficult further thermal conductivity reduction and the like of the thermal coating prepared by conventional plasma spraying. Under the condition of the plasma spraying technology, the preheating temperature of a base body, the moving speed of a plasma spraying gun and a powder delivery rate are adjusted, then a rare earth oxide doped zirconia thermal barrier coating (BH-TBCO1) with a craze crack structure and stable thermodynamics is prepared. The rare earth oxide doped zirconia thermal barrier coating with a craze crack structure has good high-temperature phase stability at the temperature below 1300 DEG C; the thermal insulation property of the thermal barrier coating is further enhanced, and the thermal insulation temperature achieves more than 150 DEG C and is enhanced by more than 50% when compared with the coating prepared by the conventional plasma spraying; the thermal shock life of the coating exceeds 4000 cycles and is enhanced by more than 1 time when compared with the coating prepared by the conventional plasma spraying.
Owner:BEIHANG UNIV

Multilayer printed wiring board having filled-via structure

The present invention provides a multilayer printed wiring board having a filled viahole structure advantageously usable for forming a fine circuit pattern thereon, and having an excellent resistance against cracking under a thermal shock or due to heat cycle. The multilayer printed wiring board is comprised of conductor circuitry layers and interlaminar insulative resin layers deposited alternately one on another, the interlaminar insulative resin layers each having formed through them holes each filled with a plating layer to form a viahole. The surface of the plating layer exposed out of the hole for the viahole is formed substantially flat and lies at a substantially same level as the surface of the conductor circuit disposed in the interlaminar insulative resin layer. The thickness of the conductor circuitry layer is less than a half of the viahole diameter and less than 25 μm. The inner wall of the hole formed in the interlaminar insulative resin layer is roughened and an electroless plating layer is deposited on the roughened surface. An electroplating layer is filled in the hole including the electroless plating layer to form the viahole. The interlaminar insulative resin layer is formed from a composite of a fluororesin showing a high fracture toughness and a heat-resistant thermoplastic resin, a composite of fluororesin and thermosetting resin or a composite of thermosetting and thermoplastic resins.
Owner:IBIDEN CO LTD

Cast high-boron high-speed steel for composite ring roller and heat treatment method thereof

The invention discloses a casting high-boron high-speed steel for manufacturing a composite roll ring roller and hot processing method thereof. The steel is a wear-resistant material having superior thermal-shock resistance, and can be applied to other suitable working conditions. The chemical compositions of the steel are (weight%): 0.20 to 1.10 of C, 1.0 to 2.5 of B, 3.0 to 5.0 of Cr, 0.5 to 0.9 of Si, 0.6 to 1.3 of Mn, 2.0 to 10.0 of V, 0.5 to 1.5 of Ni, 1.0 to 4.0 of Mo, 0.2 to 4.0 of W, 0.1 to 2.0 of Nb, less than 0.04 of S, less than 0.04 of P and residue of Fe. The hot processing method includes annealing, quenching and 2 to 3 times of temper. The annealing heating temperature is 800 to 860 DEG C, furnace cooling or air cooling is carried out after furnace cooling to less than 500 DEG C; the quenching heating temperature is 1020 to 1150 DEG C, wind cooling or air cooling is carried out thereafter; 2 to 3 times of temper are carried out, the heating temperature is 500 to 550 DEG C, furnace cooling or air cooling is carried out thereafter. Compared with traditional high-nickle-chrome-molybdenum roller, the roller of the invention greatly improves alloy wearing resistance, heat resistance and thermal-shock resistance, and reduces thermal endurance crack phenomena appearing during use, as well as pits and crack arising therefrom, embodying good organic combination of safety and wearing resistance.
Owner:HUNAN 3T NEW MATERIAL
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