75 results about "Glassy carbon" patented technology

The invention provides a preparation method of a plate-shaped glassy carbon electrode, which comprises the following steps: curing a resin raw material into a plate-shaped resin block, carbonizing in an inert atmosphere, and respectively introducing a nitrogen source and a boron source for doping operation to obtain a co-doped plate-shaped resin block precursor; placing the co-doped plate-shaped resin block between two porous graphite plates, and carrying out high-temperature treatment to obtain a glassy carbon matrix; and immersing the glassy carbon substrate into the adhesion layer solution to form an adhesion layer, transferring the adhesion layer into a deposition solution which comprises a bismuth-containing solution and a gold-containing solution, forming bismuth-gold nano-dots on the adhesion layer, and washing and drying the bismuth-gold nano-dots to obtain the plate-shaped glassy carbon electrode. Through directional arrangement of crystal orientations, the tantalum carbide coating achieves higher electrical conductivity and thermal conductivity. And the sensitivity and the service life of the plate-shaped glassy carbon electrode are obviously improved and prolonged.

The invention relates to an environment-friendly water-based composite flame retardant and a preparation method thereof, and belongs to the technical field of flame retardant preparation. A formula of the environment-friendly water-based composite flame retardant comprises the following components in percentage by weight: 1.5-3.0% of modified graphene, 8-12% of nano magnesium hydroxide, 5-8% of nano sodium silicate, 0.5-1.0% of a surfactant and the balance of deionized water. Modified graphene, nano magnesium hydroxide and sodium silicate generate a synergistic flame-retardant effect, the modified graphene builds a compact carbon layer framework, magnesium hydroxide reflects heat radiation through endothermic decomposition and magnesium oxide barrier, sodium silicate promotes formation of a silicate glassy carbon layer, and the oxygen index of the material is remarkably increased through compounding of the three. The flame retardant prepared by the invention has excellent thermal conductivity and environment-friendly characteristic, and can be widely applied to the fields of fire extinguishing and flame retardance.

This invention discloses a hydrogel fire extinguishing material for mines and its preparation method, specifically relating to the field of fire extinguishing materials technology. The material comprises solid water glass, sodium bicarbonate, polyvinyl alcohol, silicon carbide, and water. The fire extinguishing gel material of this invention possesses the characteristics of simple preparation process, low raw material requirements, low cost, controllable gelation time, good water retention, environmental friendliness, excellent high-temperature stability, and excellent thermal conductivity. Even after complete water loss, it can still form a crack-free solid film on the coal surface to isolate the coal-oxygen reaction, effectively solving the problems of traditional inorganic fire extinguishing gels being prone to water loss and cracking, and releasing toxic gases during use. By changing the material ratio, gelation can be controlled over a wide time range, meeting different needs for on-site filling, long-distance transportation, and storage in coal mines.

The invention belongs to the field of polyurethane materials, and particularly discloses a flame-retardant polyurethane material as well as a preparation method and application thereof. The flame-retardant polyurethane material comprises the phosphorus flame retardant, the melamine polyphosphate and the barium metaborate, the phosphorus flame retardant, the melamine polyphosphate and the barium metaborate have a synergistic effect, a continuous, compact and glassy-state-like carbon barrier layer is formed at the burning position of the material, halogen-free flame retardance of the polyurethane material can be achieved, and molten drops can be effectively prevented. Besides, the polyurethane material disclosed by the invention is proper in component and dosage, so that the material formability is good, bubbles and flame retardant precipitation after the material is formed can be avoided, and the utilization rate of the flame retardant is increased.

The utility model provides a high-melting-point graphite pipe for elemental analysis, which belongs to the technical field of spectral analysis and comprises a circular hollow graphite pipe main body and transverse support parts symmetrically arranged on two sides of the graphite pipe main body, an inner pyrolytic carbon layer is deposited on the inner wall of the graphite pipe, a porous structure is arranged in the inner pyrolytic carbon layer, and an outer compact pyrolytic carbon layer is further deposited on the surface of the inner pyrolytic carbon layer. Through the inner pyrolytic carbon layer and the outer compact pyrolytic carbon layer, in the high-temperature working process, the inner wall pyrolytic carbon layer can be selectively consumed to form a compact glassy carbon film, a self-adaptive protection mechanism enables the graphite tube to still keep stable analysis performance under extreme conditions, reaction or permeation of a detected element and graphite at high temperature is reduced, and the analysis accuracy of the graphite tube is improved. The phenomenon of cross contamination is reduced, the memory effect of the graphite pipe is reduced by 70%, but the memory effect of a traditional pyrolytic graphite pipe can only be reduced by 30-40%, and the graphite pipe is particularly suitable for analysis of high-melting-point elements.

A header rail 10 for transporting gas cylinders (30, fig 3) on lorries has an elongate non-metal (e.g. composite such as glass / carbon fibre) central core 12, with metal collars 14 spaced apart along t

The invention relates to a differential calorimeter for detecting a thermodynamic characteristic variable of a sample, wherein at least one heating element (2) and at least one thermal element (3) as temperature sensor are formed in each case in the form of a coating on the surface of a planar substrate (1) which is formed from a glass, glass ceramic, glass carbon or ceramic material having a thermal conductivity of less than 20 W / (m K).

The present invention provides an antifouling lead ion selective electrode prepared using dendritic polypeptides, which belongs to the technical field of marine pollution detection. The present invention first electrodeposit polyaniline (PANI) nanowires on a glassy carbon substrate to form a GC / PANI substrate, then prepare MXene nanosheets and composite them with PANI to form GC / PANI-MXene, and then drop lead ion carrier Pb onto the GC / PANI-MXene. 2+ ‑ISM, and finally the electrode surface was modified with dendrimer peptides to obtain GC / PANI‑MXene / Pb 2+ -ISM / pep electrode. The electrode prepared by the present invention can inhibit the adhesion of nonspecific microorganisms and has excellent stability.

The application provides a glass carbon mold and a recrystallized silicon carbide product and a preparation method, and belongs to the technical field of ceramic material preparation. Microcrystalline cellulose is mixed with water, and the obtained mixture is formed to obtain a cellulose body; the cellulose body is subjected to a stabilization treatment in an oxygen-containing atmosphere to obtain a stabilized body; and the stabilized body is subjected to a carbonization treatment in a protective atmosphere to obtain the glass carbon mold. The glass carbon mold is used to prepare the recrystallized silicon carbide product, which is convenient for directly forming a complex green body and can be sintered together with the product, solves the problem that the green body is easily damaged and deformed in the transfer process, and is environmentally friendly.

A superstructural glassy carbon, a preparation method therefor and a use thereof. Firstly, provided is a superstructural glassy carbon having a stable structure with uniformly distributed anisotropic stress. Secondly, also provided are a preparation method and a use of the superstructural glassy carbon, and a bone repair material obtained on the basis of the superstructural glassy carbon.

Disclosed herein is a battery for generating hydrogen. The battery comprises a working electrode; a reference electrode; a counter electrode; the electrolyte is sulfuric acid with the concentration of about 0.5 M; wherein the working electrode is prepared by coating a layer of ink on a glassy carbon electrode and air-drying the glassy carbon electrode; and the ink is prepared by mixing the TMD composite material decorated by platinum nanoparticles with a solution to form a mixture and carrying out ultrasonic treatment on the mixture, and the solution is composed of water, ethanol and 5% sulfonated tetrafluoroethylidene fluorinated polymer-copolymer dispersion according to a volume ratio of 4: 1: 0.1.

Disclosed herein are the synthesis and characterisations of the monoacrylate-functionalised phthalonitriles (PNs). Their chemical structures are verified with 1H nuclear magnetic resonance (NMR) and Fourier transform infrared (FT-IR) spectra to confirm the successful synthesis. Subsequently, photopolymerisable resins, based on the prepared PN monomer, a commercial diacrylate and other additives can be formulated. Being post thermally treated, the PN based resins result in polymeric products with excellent thermal and mechanical performances, suggesting the high-performance nature of the PN based resins. Interestingly, the resins exhibit significant high carbon yield, indicating that they are greatly promising candidates as carbon precursors. As it is found that the resins have good three-dimensional (3D) printing capability and can be fabricated using high-resolution projection micro-stereolithography (PμSL) additive manufacturing technology, complex 3D structured objects are herein printed and performed follow-up post treatment. After being progressively pyrolysed up to 1000° C., the printed objects can be readily converted to glassy carbon (GC) structures with structural integrity and fidelity. Only ˜25% of shrinkage was found for the converted GC structure due to the significantly high char yield of the PN resins. This work not only expands the library of new class of high-performance PN resins for popular additive manufacturing but also features the precision 3D printing of GC with low shrinkage and high carbon yield for the first time.

The present invention relates to a method for treating a substrate having a free surface made of a semiconductor material, in particular a single–crystal semiconductor material, comprising a method for stabilising the surface against the formation of terraces and / or beads, the method comprising: • forming a vitreous carbon layer (30) by a gas-phase carbon reaction on the surface at a temperature (T1) greater than 700°C, preferably greater than 800°C, and strictly lower than 1000°C, preferably lower than 950°C, and more preferably lower than 900°C; and • applying a heat treatment to the substrate after stabilising the surface, wherein the vitreous carbon layer (30) limits the reorganisation of the surface made of a semiconductor material in the form of terraces, the depositing of the carbon layer (30) and the heat treatment being carried out in the same furnace.

The invention discloses a heat conduction assembly, a heat exchanger for chemicals and a preparation method of the heat conduction assembly, and belongs to the technical field of heat exchange. The heat exchanger for the chemicals comprises a cavity, heat exchange assemblies located on the two sides of the cavity and a heat conduction assembly attached between the cavity and the heat exchange assemblies, the heat conduction assembly comprises a heat conduction plate and a glassy carbon sheet, the glassy carbon sheet is attached to the center of the side, close to the cavity, of the heat conduction plate, and the cavity is connected with the heat conduction plate in a sealed mode. The heat exchange assembly comprises a heat exchange plate and a thermoelectric wafer, and the thermoelectric wafer is attached between the heat exchange plate and the heat conduction plate. On the premise that reaction with chemicals is avoided, the number of structural layers is reduced, the heat exchange efficiency is improved, installation is convenient, connection between the layers is reliable, and leakage is avoided.

The invention relates to the technical field of preparation of C / C composite coatings, in particular to a glassy carbon in-situ reaction SiC-based coating and a preparation method and application thereof.The method comprises the steps that glassy carbon powder is prepared from a carbon-containing precursor, the prepared glassy carbon powder serves as a supplementary carbon source, and mixed slurry is prepared from the supplementary carbon source and mixed ceramic powder; finally, a SiC-based coating preform is prefabricated and sequentially subjected to carbonization treatment and siliconizing treatment, glassy carbon serves as a supplementary carbon source to be subjected to an in-situ reaction with free silicon to generate SiC, and therefore the content of residual silicon is reduced, meanwhile, the compactness of the coating is improved, the internal structure and high-temperature oxidation resistance of the C / C composite material are improved, and the performance of the composite material is improved. The material is more stable in performance and longer in service life in a high-temperature environment, the glassy carbon is low in cost, simple and convenient to prepare and remarkable in economic advantage, and the problem that a C / C composite coating is poor in high-temperature stability in the prior art is solved.

The invention discloses a potassium ion working electrode based on eggshell-shaped hollow carbon microspheres and a preparation method and application thereof, the electrode comprises a glassy carbon substrate and an ESHCMS layer modified on the surface of the glassy carbon substrate, and the ESHCMS layer is composed of eggshell-shaped hollow carbon microspheres. The eggshell-shaped hollow carbon microspheres are synthesized through a simple hydrothermal method, the prepared eggshell-shaped hollow carbon microspheres are good in graphitization degree, the large specific surface area, the excellent electronic conductivity and the excellent chemical stability of the eggshell-shaped hollow carbon microspheres and the high electric capacity and the good hydrophobicity when the eggshell-shaped hollow carbon microspheres serve as double electric layers are utilized, and the graphitization degree of the eggshell-shaped hollow carbon microspheres is improved. The potassium ion selective electrode is introduced between a polymer film and a glassy carbon substrate, so that a water layer between a conductive substrate and the polymer film is effectively eliminated, the potential of the potassium ion selective electrode is stabilized, and the sensitivity, selectivity and response speed of the working electrode are improved.

The invention discloses a glassy carbon mixed paving thickness optimization method for a head cover of a railway vehicle cab, solves the problem that the thickness of each layer in a composite board in the prior art is not reasonably optimized, and has the beneficial effect of effectively controlling the thickness of each layer in the composite board on the premise of ensuring the quality and rigidity of the head cover. According to the specific scheme, the method for optimizing the glassy carbon mixed laying thickness of the railway vehicle cab hood comprises the steps that the railway vehicle cab hood is made of a composite material hood, and the bending rigidity of the composite material hood per unit width is obtained; substituting the total thickness of the railway vehicle cab hood into the bending rigidity of the composite material hood in unit width to obtain a rigidity optimization formula; calculating the relationship between the thickness of the outer carbon fiber layer and the thickness of the inner glass fiber layer according to a rigidity optimization formula; and determining the optimal solutions of the thickness of the outer carbon fiber layer and the thickness of the inner glass fiber layer based on the relationship between the thickness of the outer carbon fiber layer and the thickness of the inner glass fiber layer by taking a weight reduction set value compared with the glass fiber reinforced plastic hood as a target.

An object of the present disclosure is to provide a grip rubber composition from which a crosslinked rubber having a great static frictional coefficient can be obtained. The present disclosure provides a grip rubber composition containing a base rubber, hard porous carbon particles and a vulcanizing agent, wherein at least one part of the hard porous carbon particle is composed of a glassy carbon, and an amount of the hard porous carbon particles ranges from 1.5 mass % to 8.5 mass % in 100 mass % of the rubber composition.

The present invention provides a method for preparing a self-supporting silicon carbide film. The method of the present invention comprises: introducing carbosilane and reducing gas into a growth chamber for the first time, and maintaining the temperature of the glassy carbon substrate at 900°C-1200°C, the pressure at 8000-20000Pa, growing for 60min-120min, and forming a silicon carbide peeling layer; introducing carbosilane and reducing gas into the growth chamber for the second time, and maintaining the temperature of the glassy carbon substrate at 1100°C-1300°C, the pressure at 8000-20000Pa, growing for 240min-560min, and forming a silicon carbide support layer on the surface of the silicon carbide peeling layer. The present invention improves the method for preparing a silicon carbide film, so that the generated silicon carbide film can achieve complete self-stripping and self-support from the surface of the glassy carbon substrate, thereby improving the appearance morphology and structural performance of the silicon carbide film, and after continued deposition, the silicon carbide film is tightly combined with the silicon carbide coating product to form a silicon carbide semiconductor product with good integrity.

The invention discloses an immunosensor for detecting porcine epidemic diarrhea virus as well as a preparation method and a detection method of the immunosensor. The preparation method of the immunosensor for detecting the porcine epidemic diarrhea virus comprises the following steps: S1, sequentially adding H2O2 and concentrated nitric acid into an aqueous solution of tungstate for reaction to obtain a modification solution; s2, performing electrochemical deposition on the glassy carbon electrode by taking the modification liquid as electrolyte; s3, taking an aniline solution composed of concentrated sulfuric acid, aniline and water as an electrolyte, and performing electrochemical polymerization on the glassy carbon / tungsten oxide electrode; s4, placing the glassy carbon / tungsten oxide / polyaniline electrode in a chloroauric acid solution for electro-deposition; s5, dispensing a porcine epidemic diarrhea virus antibody on the surface of the glassy carbon / tungsten oxide / polyaniline / gold electrode, and incubating; and S6, dropwise adding bovine serum albumin on the surface of the glassy carbon / tungsten oxide / polyaniline / gold-antibody electrode, and sealing. The sensor has the advantages of high detection speed, high stability, strong anti-interference performance and the like.

The utility model relates to the technical field of coating devices, and particularly discloses a reciprocating type glassy carbon graphite coating coating device which comprises a base, an air cylinder I is mounted on the surface of the base, and a shell is mounted on the surface of the base; a sliding structure is arranged in the shell, and the sliding structure is characterized in that a coating material box is installed on the surface of the shell, a pump body is connected to the surface of the shell, one end of the pump body is connected with the coating material box, one side of the pump body is connected with a pipeline, and a second air cylinder is embedded in the inner wall of the coating material box. According to the reciprocating type glassy carbon graphite coating coating device, a sliding structure is arranged, an infrared sensor is used for detecting materials, the infrared sensor controls a second air cylinder to move, the second air cylinder drives a spray head to move, the moving distance of the spray head can be controlled according to the size of the materials, and coating waste is reduced; and reciprocating spraying is conducted on the materials, and the practicability of the device is improved.

The present application discloses a conductive high-strength diamond / amorphous carbon composite material and a preparation process thereof. The diamond / amorphous carbon composite material is composed of an amorphous carbon continuous phase and multiple separate diamond phases embedded in the amorphous carbon continuous phase, wherein the diamond phases exhibit an ordered sp3 hybrid state, and the amorphous carbon continuous phase exhibits a disordered sp2 hybrid state. The present application further discloses a process for preparing the above diamond / amorphous carbon composite material. The process comprises using sp3 carbon powder or glassy carbon as a raw material to obtain the above-mentioned material by sintering. The diamond / amorphous carbon composite material shows good electrical conductivity, good electrical discharge machining ability, good chemical stability and light weight, and has broad application prospects in aerospace, automobile industry and biomedical equipment.

A cutting blade(2), which can cut an insulating film while suppressing exfoliation of the insulating film such as a Low-k film that is likely to be exfoliated upon cutting, is demanded. A cutting blade(2), that can meet this demand, has a binder(2b) and abrasive particles(2a), in which the abrasive particles(2a) are fixed by the binder(2b) at least part of which is glassy carbon. The most suitable drawing: Fig. 1.

This invention relates to the field of pollutant detection technology, and discloses a method for preparing bimetallic selenides and its non-enzymatic electrochemical sensor and applications. The reference electrode of the non-enzymatic electrochemical sensor is a silver / silver chloride electrode, the auxiliary electrode is a platinum wire electrode, and the working electrode is a glassy carbon composite electrode containing a bimetallic selenide coating. The bimetallic selenide is CuInSe2, which exhibits sensitivity in identifying parathion. This improves the accuracy and ease of operation in detecting parathion and reduces the detection cost. The method for preparing the bimetallic selenide proposed in this invention uses ethylamine and N,N-dimethylformamide as solvents, and through a solvothermal reaction, reacts cuprous chloride, indium chloride, and selenium powder to generate CuInSe2, which has the advantages of high reaction efficiency and low manufacturing cost.

This invention discloses a method for preparing a high-strength, high-thermal-conductivity graphite ceramic composite material. The graphite ceramic composite material is composed of graphite powder, a silicon carbide reinforcing network, and glassy carbon. The silicon carbide reinforcing network consists of a dendritic silicon carbide network and a regularized silicon carbide network. The preparation process of the high-strength, high-thermal-conductivity graphite ceramic composite material includes powder mixing, layer-unit micro-hot pressing, interlayer degassing network construction, repeated processes, pressure-holding curing, rapid carbonization, multiple impregnation strengthening, and high-temperature sintering. The method for preparing the high-strength, high-thermal-conductivity graphite ceramic composite material provided by this invention has advantages such as low energy consumption and low cost. It belongs to pressureless sintering technology and is suitable for the preparation of large-size graphite ceramic composite materials. The obtained graphite ceramic composite material possesses high strength, high thermal conductivity, oxidation resistance, and thermal shock resistance, and has broad application prospects in high-temperature casting, civilian and military equipment, and other fields.

This application relates to a grouting material based on tailings sand and its preparation method, belonging to the field of grouting material technology. The grouting material based on tailings sand comprises component A and component B. This application utilizes lead-zinc tailings sand placed in an alkaline environment to enhance the gelation activity of its main component, feldspar. Through proper proportioning, it rapidly solidifies and maintains high strength under the combined action of water glass, sodium carbonate, and calcium hydroxide. Furthermore, the grouting material uses commonly used raw materials, ensuring ample market supply and convenient procurement. It also enables the resource utilization of tailings sand, resulting in significant economic and social benefits.

The invention discloses a lead ion ultra-trace detection method based on a non-mercury film modified microarray electrode technology, which comprises the following steps: providing a microarray working electrode composed of a plurality of glassy carbon microelectrode units, and carrying out mechanical polishing and / or electrochemical activation on the exposed surface of the microarray working electrode; the microarray working electrode, a reference electrode and a counter electrode are jointly placed in a modification solution containing a non-mercury electroactive substance, a continuous non-mercury electroactive film layer is formed on the exposed surface of each glassy carbon microelectrode unit through electrochemical deposition, and the non-mercury electroactive film layer is in direct electric contact with a glassy carbon substrate; placing the microarray working electrode modified by the non-mercury electroactive film layer, a reference electrode and a counter electrode in a buffer electrolyte, and carrying out electrochemical cleaning; a to-be-detected sample and a buffer solution are mixed to form a to-be-detected solution, the to-be-detected solution is put into a three-electrode system, anodic stripping scanning is conducted through differential pulse voltammetry or square wave voltammetry, and the lead ion concentration in the sample is determined. The method does not need complex pretreatment, the detection limit reaches 0.1 mu M (20 mu g / L), and lead ions in complex matrixes such as clinical serum and the like can be rapidly and accurately detected.

The invention relates to the technical field of grouting materials for constructional engineering, and discloses a high-performance superfine fly ash-based geopolymer grouting material and a preparation method thereof, the high-performance superfine fly ash-based geopolymer grouting material comprises the following three components in parts by mass: a group P: 70-90 parts of superfine fly ash with a median particle size of 2-5 microns, and a group B: 70-90 parts of superfine fly ash with a median particle size of 2-5 microns; 0.2-1 micron in particle size double peaks accounts for 10%-30%, 5-15 parts of nano silica sol curing powder, 2-10 parts of a zeolite precursor, 1-5 parts of a sodium fixing agent and 0.2-2 parts of a low-temperature seed crystal. The preparation method comprises the following steps: separately feeding three components P / E / T, converging at the tail end of a coaxial static mixer, forming a low-alkali base line by using low-modulus water glass-sodium carbonate-sodium metaaluminate, matching layered double hydroxide-polyelectrolyte shell microcapsules and a salt-sensitive polycarboxylic acid dispersant, superposing calcium aluminate low-temperature seed crystals and annularly injecting a calcium chloride solution at a nozzle end, thereby obtaining the low-alkali composite microcapsule. Therefore, the effects of stable conveying, in-situ forming and no perturbation by seepage in micro cracks of low-conductivity fresh water and low-temperature seepage water areas are achieved.

A wafer lift pin that is inserted in an insertion hole of a susceptor in a semiconductor production apparatus so as to be movable in a vertical direction and is used for lifting a silicon wafer placed on the susceptor includes: a rod-shaped base material made from glassy carbon; and an SiC film that is formed by a CVD method and coats a surface of the base material, wherein at least a sliding portion with an inner side of the insertion hole of the susceptor is coated with the SiC film; when the surface of the SiC film is observed with a scanning electron microscope, the surface of the wafer lift pin in an observation visual field is entirely coated with SiC particles, and a ratio of an observed area of small SiC particles having a particle diameter of 2.00 µm or smaller to a total area coated with the SiC film in the observation visual field is 50% or more; and a portion abutting against the silicon wafer is not coated with the SiC film. According to the present invention, there can be provided a wafer lift pin in which the cracking of the SiC film originating in the difference in the coefficient of thermal expansion between the SiC film and the glassy carbon resists occurring when the formed SiC film is cooled.

The present invention is a base substrate for a single-crystal diamond laminate substrate. The base substrate comprises: an initial substrate that has a linear expansion coefficient smaller than that of single-crystal α-Al2O3 and equal to or greater than 0.5 × 10−6 / K, the initial substrate containing at least one of amorphous carbon, glassy carbon, polycrystalline diamond, and single-crystal diamond; a single-crystal α-Al2O3 layer on the initial substrate; and a heteroepitaxial layer composed of any of an iridium film, a rhodium film, and a platinum film on the single-crystal α-Al2O3 layer. The present invention thereby provides a base substrate that has a large area (large diameter) and high crystallinity and is capable of forming a high-quality single-crystal diamond layer having high purity and low stress.