106results about How to "Stable performance at high temperature" patented technology

The invention provides a drilling fluid for shale hydrocarbon reservoir exploration. The drilling fluid is based on water, and comprises 4-6wt% of bentonite, 2-5wt% of potassium silicate, 0.2-0.5wt% of a coating inhibitor, 0.2-1.5wt% of a flow pattern regulator, 4-6wt% of a fluid loss additive, 2-3wt% of a shale caving inhibitor, 2-3wt% of a plugging agent, 0.5-1wt% of a filter cake surface modifier, 2-4wt% of a lubricant and 0.4-0.6wt% of a pH value regulator. The drilling fluid has the characteristics of good plugging property, strong inhibition, good lubricity and stable high temperature performances to shale hydrocarbon reservoir stratums, and is suitable for the exploration of shale hydrocarbon reservoirs.

The invention relates to stable high temperature performance modified emulsified asphalt and a preparation method thereof. Based on the weight of matrix asphalt, the mixture of phosphorus-containing compound is 0.1-5%, compound emulsifying agent is 0.5-5%, modifying agent rubber latex is 1-10%. The components and weight percentage of the mixture of the phosphorous-containing compound are: 35%-40% of polyphosphoric acid, 20%-30% of pyrophosphoric acid, and 35%-40% of phosphoric acid. The components and weight percentage of the compound emulsifying agent are: 25%-30% of CAPB, 5%-10% of octadecane DTMAC and 60%-65% of water. And the modified agent rubber latex is styrene butadiene latex. Compared with the prior art, the modified emulsified asphalt prepared by the invention has the following prominent advantages that the softening point of evaporated residue of the modified emulsified asphalt is high; the modified emulsified asphalt has stable high temperature performance, simple processing technique, convenient operation, and high performance and is applicable to the micro-surface treatment of the slurry seal.

The invention discloses a method for preparing a high temperature NTC (Negative Temperature Coefficient) thermistor material, which comprises the following steps of: according to a formula of CaWO4-xCeTiyO2y+2, weighing and analyzing pure powdered CaCO3, CeO2, TiO2 and WO3, placing the powder into a ball milling tank, adding deionized water and zirconium ball grinding stone and carrying out ball milling for four hours; drying ball-milled slurry, grinding the dried powder and sieving the powder through a 80-mesh sieve; presintering the sieved powder, ball-grinding the presintered powder again, drying and grinding the powder and sieving the power through the 80-mesh sieve to obtain uniform and fine powder; and finally, placing a dry-pressed sample into a high temperature furnace to sinter so as to obtain the thermistor material. A main crystal phase of the thermistor material prepared by the method disclosed by the invention is a scheelite phase; the thermistor material has room temperature resistivity of 5.642*10<6> to 1.982*10<9> ohm.cm and has material constant of 5,077 to 7,275K; in the integral test temperature range, a resistor temperature relation curve LnRho-1000 / T has good linearity; and the method is suitable for temperature measurement in the wide temperature range of room temperature to 1,000 DEG C.

The invention belongs to the field of ceramic material preparation and provides a ceramic connection method by using a high-temperature interlayer material. Ti3SiC2 is used as a high-temperature interlayer material, the high-temperature interlayer material and a ceramic material are loaded in a graphite die in a sequence of the ceramic material, the high-temperature interlayer material and the ceramic material, the connection of the ceramic material is realized through a spark plasma sintering technology, and excellent connection effect is achieved during the connection of carborundum ceramic. The high-temperature interlayer material can be directly used for connecting the ceramic material and a ceramic-based composite material without conducting surface pre-coating or other modification treatments to the surface of the ceramic material before connection. The ceramic material connected by the high-temperature interlayer material has high connection strength and stable high-temperature property.

The invention relates to a method for preparing a super high temperature zirconia ceramic fiber. The method mainly comprises the following steps: stirring zirconium carbonate, yttrium nitrate and nitric acid as main raw materials and deionized water as a diluting solvent at the room temperate so as to directly generate a composite polymerization solution with yttrium zirconium ions, depressurizing, distilling and concentrating the solution to finally obtain a yttrium zirconium ion composite sol spinning liquid, performing high speed eccentric wire throwing to obtain a yttrium zirconium containing inorganic hydrate fiber, and performing thermal treatment and super high temperature treatment on the yttrium zirconium containing inorganic hydrate fiber under special atmosphere so as to obtain the yttrium zirconium composite oxide ceramic fiber. The preparation process is simple, and the prepared fiber is simple in preparation process, high in purity, stable in high temperature property and can be used within the temperature range less than 2,250 DEG C for a long time.

The invention relates to a zirconium-containing high-temperature silicon carbide fiber and a preparation method thereof. The preparation method comprises the following steps: S101, dissolving yttriumoxide into ethanol, heating, and uniformly stirring so as to obtain a first solution; S102, mixing and uniformly mixing the first solution with a nano-zirconia dispersion so as to obtain a second solution; S103, dissolving polycarbosilane into dimethylbenzene, adding a second solution, stirring, heating till a solvent is completely volatized so as to obtain a powder product; S104, performing melting spinning and non-melting treatment on the powder product so as to obtain a cross-linked fiber bundle; and S105, performing high-temperature sintering on the cross-linked fiber bundle in an inert atmosphere, and cooling to the room temperature, thereby obtaining the silicon carbide fiber. Zirconium oxide and yttrium oxide are introduced in the preparation process of the silicon carbide fiber preparation process, by virtue of the phase change size expansion of the zirconium oxide and the high-temperature flowability of the yttrium oxide, the silicon carbide fiber which is high in strength andstable in property at high temperatures is prepared, and the silicon carbide fiber has high application prospects in high-temperature fields such as aerospace.

The invention relates to high-temperature heat storage device utilizing concrete and its heat storing method. Its heat exchange pipeline is buried in concrete heat storage block, heat exchange fin is at external wall of the pipe, a valve is mounted at cold fluid inlet, cold fluid outlet is at the other end of cold fluid tank; a valve is mounted at heat fluid inlet, heat fluid outlet is at the other end of heat fluid tank. Heat exchange is carried out utilizing the difference of temperature between the concrete heat storage block and the heat exchange pipeline.

The invention relates to a light granular calcium oxide material and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: firstly, putting calcium hydroxide powder into a bucket of a pelletizer; adding water which accounts for 10-30wt% of the calcium hydroxide powder under the condition that the rotation speed of a rotor is 1000-3000rpm; adjusting the rotation speed of the rotor to be 500-1000rpm, and after calcium hydroxide granules are formed, discharging the calcium hydroxide granules; putting the calcium hydroxide granules into a heating furnace, keeping the temperature for 1-5 hours at 600-1300 DEG C, and introducing nitrogen or argon into the furnace at a flowing speed of 0.5-5 liters per minute till the temperature is 35 DEG C, thereby obtaining the light granular calcium oxide material. The preparation method has the characteristics of being simple in process, low in cost and low in energy consumption; the prepared granular calcium oxide material is high in use temperature, stable in high-temperature property, low in volume density, light in weight and good in thermal insulation.

A nitrided steel base plate with excellent corrosion resistance comprises, by weight percent, 0.010%-0.10% of C, 0.10%-1.00% of Mn, 0.010%-0.10% of Si, smaller than or equal to 0.02% of P, smaller than or equal to 0.01% of S, 0.50%-1.50% of Als, smaller than or equal to 0.005% of N, 0.10%-1.50% of Cr, 0.01%-1.00% of Cu and 0.01%-1.00% of Ni. A production method comprises the preparing steps of melting and continuous casting blank forming, cast blank heating, hot rolling, reeling, cold rolling, annealing and flattening. Steel used for a traditional iron pan serves as a base body, and rusting can be effectively avoided after nitriding treatment; the surface hardness is high, the corrosion resistance is excellent, the high-temperature performance is stable, and the fatigue resisting strength is high. After the low-carbon steel plate is subjected to the nitriding treatment, the low-carbon steel plate can replace stainless steel and functional coating steel plates to be used for manufacturing woks, corrosion resisting containers and the like.

Using YAG single crystal body converts part of blue light sent from GaN based semiconductor LED crystal grain to another light in one or more ideal wave bands. Then, not converted remanent blue light sent from LED crystal grain is mixed with the converted light in ideal wave band to generate white light. Through controlling each parameter of fluorophor of single crystal chip, the method adjusts and controls proportion between yellow light converted by the fluorophor of single crystal and not converted blue light. At the same time, using evenness of single crystal chip obtains even white light in high quality. Comparing with traditional technique, the invention solves difficult issue of controlling dispersivity of powder of fluorophor in sealant in silicone greases or resins. After wafer is cut to chips in desired size, packaging operation is full automatic so as to raise degree of mechanization.

The invention belongs to the technical field of construction materials and discloses high temperature resistant low-density oil-well cement. The low-density oil-well cement is prepared from the following substances in parts by weight: 40 to 60 parts of G-grade oil-well cement, 2 to 5 parts of phosphorus gypsum, 10 to 20 parts of waste glass powder, 30 to 40 parts of fly ash, 0.5 to 3 parts of a plastic expanding agent, 0.05 to 1 part of a stabilizer, 0.5 to 1 part of a retarder, 0.01 to 0.03 part of an enhancing agent, 1 to 3 parts of a dispersant and 0.5 to 2 parts of aluminum dihydrogen phosphate. The low-density oil-well cement disclosed by the invention has the advantages of small density, good flowability, stable high-temperature performance and the like, and is very suitable for requirements of cementing engineering of deep wells and long shut-in wells.

The invention relates to an aluminiferous silicon carbide fiber and a preparation method of the silicon carbide fiber. The method comprises the following steps of: S101: grinding aluminum isopropoxide, heating to a molten state, S102: adding aluminum isopropoxide in the molten state into hot water for uniform stirring and standing, regulating a pH (potential of hydrogen) value of a solution afterthe standing to 2.0-3.0, and performing backflow ageing to form aluminum collosol, S103: soaking a melt spinning product in the aluminum collosol, and then taking out and drying the product, S104: performing infusibility treatment on a product obtained in S103, and S105: performing high-temperature sintering on a product obtained in S104, and obtaining the aluminiferous silicon carbide fiber at last. In a preparation process of the silicon carbide fiber, an Al element is introduced by a physical method; the method is simple in technology, has no adverse effect on an environment; and the prepared aluminiferous silicon carbide fiber is high in strength, large in modulus and stable in high temperature property, and has good application prospects in the high temperature field of aerospace, weaponry and the like.

The invention discloses a method for preparing an AlCr2C material based on induction furnace melting. According to the technical scheme, the method comprises the following steps: vacuumizing an induction furnace with an aluminum ingot to be 7*10<-2>Pa or below, and filling argon gas in the induction furnace until the pressure of the argon gas is an atmospheric pressure; melting the aluminum ingot in the induction furnace, continuing to heat to 800-1700 DEG C, adding chromium powder, melting the chromium powder, adding graphite powder, preserving heat for 2-30 minutes, finally cooling to 600-1000 DEG C, casting and cooling to prepare the AlCr2C material. The preparation process is conducted under the condition that the pressure of the argon gas is the atmospheric pressure; the chromium powder and the graphite powder are added according to a molar ratio of the aluminum ingot to the chromium powder to the graphite powder of 1 to 2 to 1; the preparation process is simple; and the prepared AlCr2C material is stable in chemical components, uniform in microscopic structures, good in hydration resistance, stable in high-temperature performance, excellent in corrosion resistance and good in thermal shock resistance.

The invention discloses an infrared electric heating film heating device with a double-film layer structure, which structurally comprises an electric heating film substrate and electrodes arranged on the two ends of the electric heating film substrate, wherein an electric conduction film layer and an infrared high emission film layer are sequentially evaporated on the surface of the electric heating film substrate. A preparation method of the infrared electric heating film heating device comprises the steps of: sequentially evaporating the electric conduction film layer and the infrared high emission film layer to the electric heating film substrate by using a high-temperature evaporation furnace, wherein an electric heating film solution comprises the components in parts by weight: 45-58parts of stannic chloride, 0.3-2.0 parts of antimony butter, 0.4-1.2 parts of nickel trichloride, 0.3-1.0 part of indium chloride, 5-15 parts of ethanol / glycerol, 6-17 parts of inorganic acid, and 20-30 parts of deionized water, and an infrared high emission film solution comprises the components in parts by weight: 35-45 parts of manganous chloride, 15-20 parts of nickel dichloride, 5-10 parts of chromium trichloride, 5-15 parts of ethanol / glycerol and 20-30 parts of deionized water; and finally assembling the electrodes to obtain the infrared electric heating film heating device. In the invention, the double-film layer structure is adopted for the infrared electric heating film heating device, which can greatly enhance radiative heat transfer, reduce convection heat transfer, improve energy efficiency and save energy sources.