169 results about "Carbon graphite" patented technology

The invention discloses a preparation method for treating bagasse to obtain hard carbon, application of the hard carbon and a sodium-ion battery negative electrode, and relates to the field of sodium-ion batteries. The preparation method of the bagasse-based hard carbon comprises the following steps: crosslinking lignin and cellulose in the bagasse-based hard carbon by using an acid solution, and partially stripping ash of biomass. And stripping hemicellulose of the bagasse by using a weak base solution to expose cellulose. By regulating and controlling the concentration, the treatment time and the treatment temperature of the alkali solution, reasonable lignin is reserved in the cellulose, so that regulation and control of a plain pore structure in the carbonization process are promoted. After the alkali solution treatment, a hydrochloric acid solution is used for cleaning the solid, and freeze drying is carried out, so that a proper pore structure is reserved. And then carrying out high-temperature heat treatment in a protective atmosphere, wherein the heat treatment is carried out in three stages. The reaction process is a cellulose deoxidation process, the treatment temperature is 300-400 DEG C, and primary carbonization of cellulose is realized; secondly, carbonizing, namely further deoxidizing after primary carbonization, wherein a large number of C = C / C-C bonds are formed at the treatment temperature of 800-1000 DEG C; and finally, forming a hard carbon graphite layer, wherein the treatment temperature is 1300-1500 DEG C. The bagasse-based hard carbon prepared by the preparation method can be efficiently and stably circulated in a sodium ion battery, and shows excellent rate capability.

The invention discloses a biomass-based hard carbon negative electrode material with high specific capacity and high magnification as well as a preparation method and application of the biomass-based hard carbon negative electrode material. The method comprises the following steps: pretreating lignocellulose biomass by a hot pressing method, and carbonizing in a protective gas atmosphere to obtain the hard carbon material. A hot-pressing pretreatment process adopted by the invention can decompose part of hemicellulose to obtain a precursor rich in lignin and cellulose, so that the thermal stability of the material is improved. In the process, the lignin can effectively inhibit the rapid centralized pyrolysis of the cellulose and weaken the rearrangement of the pyrolysis product of the cellulose. The method not only helps to prevent overgrowth of hard carbon graphite microcrystals during high-temperature carbonization, but also promotes generation of a small-size closed-pore structure, so that the microstructure of the hard carbon material is optimized. The hard carbon material shows high specific capacity and excellent rate capability when being applied to a sodium-ion battery negative electrode. The method has the advantages of simplicity in operation, low requirements on equipment, no need of adding chemical reagents, greenness, environmental protection and the like.

The invention discloses a biological carbon / graphene composite material as well as a preparation method and application thereof. The method comprises the following steps: impregnating a biomass raw material with a copper salt solution to obtain a precursor; the precursor is pyrolyzed to obtain a copper oxide modified biological carbon material, then under the conditions of reducing atmosphere and high temperature, carbon dioxide serves as a carbon source, graphene is generated on the copper oxide modified biological carbon material in situ, the biological carbon / graphene / copper composite material is obtained, and the biological carbon / graphene / copper composite material is subjected to copper leaching treatment to obtain the graphene / copper composite material. Obtaining a finished product. The composite material has excellent electrochemical performance, and has excellent rate capability, capacitance and long cycle service life when being used for preparing a capacitor. The preparation method is simple, low in cost and suitable for industrial production.

The invention discloses a large-flow carbon-graphite floating ring seal leakage rate detection structure, and the structure comprises a housing which is internally provided with a hollow accommodation cavity; the connecting seat is of an annular structure, and the connecting seat is arranged in the containing cavity; the shaft sleeve is used for being connected with a rotating shaft, the shaft sleeve is arranged on the inner side of the connecting seat, and the shaft sleeve is provided with two contact parts which are of an annular structure and are axially arranged; a carbon graphite floating ring sealing device is arranged between the contact part and the connecting seat and comprises a mounting seat and a graphite floating ring; the mounting seat is connected to the inner side of the connecting seat, the graphite floating ring is arranged on the inner side of the mounting seat, the graphite floating ring is in surface contact with the contact part to form a sealed matching pair, and the graphite floating ring is in sliding fit with the contact part; a sealing cavity is formed between the two contact parts through a matching pair; the invention relates to the technical field of carbon graphite floating ring sealing.

The present invention relates to the technical field of bipolar plates for all-vanadium liquid flow batteries, and in particular to a modified binary composite bipolar plate for vanadium batteries and a preparation method thereof, which at least comprises the following steps: realizing the coating of carbon nanotubes by chitosan in an acetic acid solution, then realizing carbon-coated graphite by alternating modification of cationic and anionic polyelectrolytes, crosslinking the two at the interface under the action of an enhanced silane coupling agent to obtain a paste filler, then preliminarily melting and kneading the resin and the polymer additive in a solvent, then melting the paste filler, the compatibilizer and the preliminarily kneaded product for a second time, and molding the final mixed particles in one piece with a hot press to obtain a modified binary composite bipolar plate. The bipolar plate prepared by the present invention crosslinks the chitosan film-coated carbon nanotubes and the carbon-coated graphite at the interface to form a continuous conductive grid, which can effectively improve the conductivity and mechanical strength of the bipolar plate, thereby improving the efficiency of the all-vanadium liquid flow battery stack.

The invention discloses a lignocellulose biomass-based hard carbon negative electrode material as well as a preparation method and application thereof. The method comprises the following steps: carrying out hydrothermal pretreatment on lignocellulose biomass by using low-corrosivity maleic acid, and regulating and controlling the composition of the lignocellulose biomass, the maleic acid and the lignocellulose to obtain a precursor rich in lignin and cellulose; in the pyrolysis and carbonization process, the thermal stability of the precursor is improved, and the lignin can more effectively inhibit the rapid concentrated pyrolysis of cellulose, so that the rearrangement of pyrolysis products is weakened. The method is beneficial for preventing overgrowth of hard carbon graphite microcrystals during high-temperature carbonization, so that the hard carbon material with large interlayer spacing and abundant small-size closed pores is prepared. The hard carbon material shows high specific capacity and excellent rate capability when being applied to the negative electrode of the sodium-ion battery. Meanwhile, xylose and furfural generated by decomposition of hemicellulose in a liquid phase can be effectively collected, and full-component utilization of biomass is achieved. The requirements of green production are met, and industrial application is easy to realize.

The invention relates to the technical field of modified carbon graphite materials, and particularly discloses an antioxidant modified carbon graphite material and a preparation method thereof, the antioxidant modified carbon graphite material comprises the following raw materials by weight: 30-34 parts of medium temperature pitch, 4-6 parts of modified silica sol and 10-12 parts of artificial graphite powder; from two aspects, firstly, the aluminum dihydrogen phosphate and the boric acid aqueous solution are added, the aluminum dihydrogen phosphate can promote the asphalt to form a denser and firmer glassy carbon structure during carbonization, and phosphorus pentoxide generated by decomposition of the aluminum dihydrogen phosphate and boron oxide generated by dehydration of boric acid can generate a glass phase with an anti-oxidation effect; secondly, core-shell particles are added, a shell layer of the core-shell structure is an aluminum hydroxide structure generated by hydrolyzing aluminum nitrate nonahydrate, and an inner core is epoxidized nano silicon carbide; through the synergistic effect of the two, the mechanical property and the oxidation resistance of the carbon-graphite material are improved.

The invention relates to the field of modified carbon graphite materials, in particular to an antioxidant modified carbon graphite material and a preparation method thereof. The preparation method of the antioxidant modified carbon-graphite material comprises the following steps: keeping vacuum, heating and melting, keeping pressurization and relieving pressure and cooling. In a vacuum environment, the graphite base material can be fully impregnated by using the phosphate in a molten state, so that the apparent porosity of the graphite base material is reduced; the pressurization is beneficial to more deeply pressing molten phosphate into pores of the graphite base material and promoting the combination between the phosphate and the graphite base material, so that the density of the graphite base material is improved; the phosphate coating the graphite base material is solidified through pressure relief and cooling, so that the oxidation resistance of the material is improved; in addition, phosphate which is insoluble in water can also be used in the method and is not easily eroded by media such as water, so that the oxidation resistance of the material is further improved.

An organic feedstock can be converted to one or more carbon allotropes by subjecting the organic feedstock to a high temperature of at least 4000 K for 60 seconds or less. The high temperature is provided by a thermal plasma generated between a pair of electrodes. In some examples, the organic feedstock includes particles of a biomass, organic polymer, and / or carbon black, and the one or more carbon allotropes are hard carbon, graphite, graphene, or carbon nanotubes.

The invention discloses a composite carbon-coated graphite negative electrode material and a preparation method and application thereof.The negative electrode material is of a coating structure, an inner core comprises graphite, a coating layer comprises graphitized carbon and hard carbon, the graphitized carbon and the hard carbon are evenly distributed, more lithium intercalation active sites are provided for the surface of the graphite, and meanwhile the surface of the graphite is coated with the composite carbon. And the high-temperature performance deterioration of the material is effectively reduced. According to the negative electrode material, the epoxy asphalt is used as a coating agent raw material, a resin-based component and an asphalt component which exist in the epoxy asphalt at the same time are subjected to carbonization treatment and graphitization treatment to obtain a hard carbon and graphitized carbon composite carbon coating layer which is uniformly distributed, and compared with coating of hard carbon or soft carbon, the composite carbon coating layer has the advantages that the coating effect is good; and the material has excellent quick-charging performance and good high-temperature performance. When the lithium ion battery electrolyte is applied to a lithium ion battery, the dynamic performance test shows that lithium is not separated out or slightly separated out, and the electrolyte has excellent fast charging performance; the capacity recovery rate can reach 80.3-91.9% after being stored for 100 days at the high temperature of 60 DEG C, and the high-temperature performance is good.

The invention discloses a multi-layer coated nano silicon negative electrode material and a preparation method and application thereof. The material is of a core-shell structure with a silicon core, a silicon dioxide middle layer, a hard carbon layer and a soft carbon outer layer. The preparation method comprises the following steps: (1) inner layer coating: generating a silicon dioxide or lithium silicate coating layer on the surface of nano silicon particles or silicon-based composite particles through in-situ oxidation or ectopic coating to form a core-shell structure; (2) middle layer coating: coating the surface of the core-shell structure obtained in the step (1) with a lithium-source-containing hard carbon or porous carbon layer to form composite particles; and (3) outer layer coating: coating the surfaces of the composite particles obtained in the step (2) with soft carbon, graphitized carbon or an organic-inorganic hybrid carbon layer to form three-layer coated nano silicon particles. Through a three-layer synergistic coating structure, the core problems of violent volume expansion, poor conductivity and unstable SEI film of the silicon negative electrode are effectively solved.

The invention provides a composite positive electrode material, a preparation method thereof, a positive electrode plate, a secondary battery and an electric device. The preparation method comprises the following steps: mixing a lithium source, a phosphorus source, an iron source, a carbon source and a carbon graphitization catalyst with a solvent according to a preset proportion to form mixed slurry; grinding and drying the mixed slurry to obtain a mixed dry substance; and sintering the mixed dry substance at the temperature of 750-840 DEG C to obtain the composite positive electrode material.

The utility model relates to the technical field of sealing, and provides a corrosion-resistant carbon graphite sealing ring which comprises a main body and a carbon graphite layer, a carbon graphite layer is arranged in the main body, and an anti-corrosion structure is arranged on the inner side of the main body; a protection structure is arranged on the outer side of the carbon graphite layer, limiting grooves are evenly formed in the outer wall of the main body, and a sealing gasket is arranged on the inner side of the main body. According to the sealing ring, the protective structure and the insulating layer are arranged to play a buffering role, the sealing ring is further prevented from being impacted and damaged in the installation and use process, use is not facilitated, the anti-corrosion layer is bonded to the inner side of the buffering layer through the hot melt adhesive layer, and the anti-corrosion layer is actually a fluororubber layer, so that the service life of the sealing ring is prolonged. And the fluororubber has excellent oil resistance and heat resistance and is suitable for sealing requirements in a high-temperature environment, so that the purpose of conveniently protecting the sealing ring is achieved.

The invention provides a silicon carbon-graphite negative electrode active material, a negative electrode material and application of the silicon carbon-graphite negative electrode active material. The silicon carbon-graphite negative electrode active material comprises a spherical silicon carbon material and fast-charging artificial graphite. The silicon-carbon-graphite negative electrode active material contains the spherical silicon-carbon material, on one hand, the energy density of the negative electrode active material is improved by the spherical silicon-carbon material, on the other hand, the spherical silicon-carbon material is spherical and can improve the pressure resistance, and the spherical silicon-carbon material and the fast-charging artificial graphite have a synergistic effect, so that the energy density of the negative electrode active material is improved. The silicon carbon-graphite negative electrode active material composed of the spherical silicon carbon material and the fast-charging artificial graphite has relatively high pressure resistance, so that the compaction density of a negative electrode plate prepared from the silicon carbon-graphite negative electrode active material can be greatly improved, and the negative electrode plate shows more excellent long-cycle low-expansion performance under the same compaction; therefore, the silicon carbon-graphite negative electrode active material has excellent expansion inhibition performance while the energy density is improved.

The invention relates to the technical field of lithium / sodium ion battery negative electrode materials, in particular to a self-supporting negative electrode material and a preparation method and application thereof.The preparation method comprises the steps that a phosphorus-carbon composite material is coated with polyaniline in an aniline in-situ polymerization mode, and polyaniline-coated phosphorus-carbon dispersion liquid is obtained; adding graphene oxide into the polyaniline coated phosphorus carbon dispersion liquid, and heating and reducing to obtain polyaniline coated phosphorus carbon / graphene aerogel; and slicing the polyaniline coated phosphorus carbon / graphene aerogel to obtain the polyaniline coated phosphorus carbon / graphene aerogel self-supporting negative electrode. The prepared self-supporting negative electrode can be directly used as an electrode, so that the preparation cost is reduced; the prepared polyaniline-coated phosphorus carbon / graphene aerogel self-supporting negative electrode has a unique porous net structure, is good in conductivity, is not easy to pulverize in the charging and discharging process, can accommodate stress generated in the circulating process, is applied to lithium ion and sodium ion batteries at the same time, and has relatively high specific capacity and relatively good circulating stability.

The invention discloses a preparation method of a coated graphite negative electrode material. The preparation method comprises the steps of mixing, granulating and coating, graphitizing and the like. Pelleting and coating are carried out before the graphitization process, unstable components in asphalt are decomposed and release small molecules in the asphalt in the hot atmosphere of oxygen, oxidative dehydrogenation is carried out at the same time, oxygen molecules in the oxygen and asphalt molecules are crosslinked to form stable macromolecules in a mode of forming C = O bonds and C-O-C bonds, the asphalt molecules are difficult to graphitize, and the graphitization performance of the asphalt is improved. An ordered structure is not easy to form in the graphitization process, the hard carbon characteristic is achieved, a coating layer formed after coating is of a two-layer structure, the coating layer is composed of a hard carbon outer layer and a hard carbon-graphite transition phase, the binding force between a graphite inner core and the hard carbon coating layer can be improved due to the existence of the hard carbon-graphite transition phase, the hard carbon-graphite composite material is more suitable for high-rate charging and discharging, and meanwhile, the hard carbon-graphite composite material has a good application prospect. And coating and carbonization are not needed after graphitization, so that the preparation time is shortened, the preparation efficiency is improved, the preparation energy consumption is greatly reduced, and the preparation cost is effectively reduced.

The present invention provides a graphene-like carbon-coated silicon / carbon / graphene composite material, a preparation method thereof, and a negative electrode material. Calculated by mass percentage, the graphene-like carbon-coated silicon / carbon / graphene composite material comprises: 1-10% of a graphene-like carbon coating layer, 1-15% of silicon, 80-95% of carbon, and 0.1-5% of graphene. Using the graphene-like carbon-coated silicon / carbon / graphene composite material as an electrode of a battery can greatly reduce the cost and achieve large-scale production. In the graphene-like carbon-coated silicon / carbon / graphene composite material of the present application, the nano-silicon is wrapped by a double carbon layer of graphene and graphene-like carbon, which can effectively alleviate the volume effect of the nano-silicon, thereby avoiding direct contact between the nano-silicon and the electrolyte, and further improving the cycle stability of the Si / C composite material. Moreover, the graphene-like carbon-coated silicon / carbon / graphene composite material has good electrical conductivity, high specific capacity, wide raw material sources, and is economical and environmentally friendly.

The invention relates to an amorphous carbon graphite structure precursor. A carbon precursor for manufacturing a carbon support having a graphite structure. The carbon precursor may include defective amorphous carbon spheres having a mass loss percentage compared to non-defective amorphous carbon spheres. The defective amorphous carbon spheres can form a single-layer graphite structure for use as a carbon support. The carbon graphite structure precursor may include amorphous carbon nanoclusters having a nominal nanocluster diameter of less than 3 nanometers. The amorphous carbon nanoclusters can form a single-layer graphite structure for use as a carbon support.

The invention relates to the technical field of batteries, and provides a battery monomer, a battery device and a power utilization device.The battery monomer comprises an electrolyte and an electrode assembly, the electrode assembly comprises a positive pole piece and a negative pole piece, and the negative pole piece comprises a negative current collector and a negative active material layer arranged on at least one side of the negative current collector; the negative electrode active material layer comprises carbon-coated graphite, and amorphous carbon is arranged on the surface of the carbon-coated graphite; the electrolyte comprises a solvent, and the solvent comprises linear carboxylic ester; in the first direction, the size of the negative electrode active material layer is larger than 130 mm, and the first direction is parallel to the gravity direction. According to the present invention, the carbon-coated graphite is adopted as the negative electrode active material, and is matched with the electrolyte containing the linear carboxylic ester, such that the problems of electrolyte local aggregation and low heat dissipation efficiency in the high battery cell can be effectively improved so as to prolong the cycle life of the battery monomer.

The invention belongs to the technical field of metallurgical auxiliary materials, and particularly discloses low-fluorine small round billet casting powder and a preparation method thereof. The low-fluorine small round billet casting powder comprises the following raw materials in percentage by mass: 15%-25% of phosphorus slag, 25%-35% of blast furnace slag, 15%-20% of diopside, 5%-8% of medium-carbon graphite, 6%-10% of amorphous graphite, 5%-10% of basic salt, 0.5%-2% of fluorite, 8%-10% of limestone, 0.5%-2% of carbon black and 1%-3% of a binder. According to the low-fluorine small round billet casting powder, traditional wollastonite is replaced with the phosphorus slag, the blast furnace slag and the diopside, the adding amount of fluorite and sodium carbonate flux is greatly reduced while the melting point viscosity of a product is reduced, and corrosion of the casting powder to refractory materials is reduced. The problems that in the prior art, a large amount of flux needs to be added into a casting powder base material to adjust the melting point viscosity of a product, but the flux can erode refractory materials are effectively solved.

The application discloses a kind of self-sintering oxidation-resistant carbon graphite sealing materials and preparation method thereof, its method includes: activated agent, catalyst and hexagonal boron nitride are mixed and reacted, after washing, dry modified hexagonal boron nitride is obtained;Subsequently, it is put into mixing kettle, again and molten pitch impregnation kneading, then it is broken and sieved to obtain pitch-coated hexagonal boron nitride powder;Again, it is pressed into shape, and physical pressure semi-carbonization treatment is carried out under inert atmosphere, again it is broken and sieved to obtain green coke coated hexagonal boron nitride powder;Crosslinking agent is dissolved in solvent, then add mesocarbon microbead, heat reaction under inert atmosphere, obtain crosslinking modified mesocarbon microbead;Green coke coated hexagonal boron nitride powder and crosslinking modified mesocarbon microbead are mixed uniformly according to the mass ratio of 5-30:70-95, to obtain pressed powder;The pressed powder is pressed into block, then cold isostatic pressing forming is carried out to obtain green body block;Green body block is calcined, then graphitization treatment is carried out under inert atmosphere, and carbon graphite sealing material is obtained.

The invention relates to a carbon graphite sealing material and a preparation method thereof, and belongs to the technical field of mechanical sealing materials, the sealing material comprises the following components: natural graphite powder and phenolic resin powder, and the mass part ratio of the natural graphite powder to the phenolic resin powder is 1: (0.2-0.4). The hardness of the material is not lower than 70 HSD, and the volume density of the carbon-graphite sealing material is not lower than 1.70 g / cm < 3 >. The sealing material is tested on a pump, and the abrasion loss does not exceed 0.1 mu m after 200 hours. The preparation method of the material comprises the following steps: fully mixing natural graphite powder and phenolic resin powder in a V-shaped mixer, and kneading the obtained mixed powder in a kneading machine to obtain a kneaded paste; and crushing the kneaded paste, carrying out hot press molding, and curing in a drying oven to obtain the carbon-graphite sealing material. The preparation process is simple, the production cost is low, the service performance of the obtained material is greatly improved, and the service life is greatly prolonged.

The utility model belongs to the technical field of carbon graphite shaft sleeve machining, and particularly relates to a carbon graphite shaft sleeve inner hole machining device to solve the technical problems that different positions of the end face of a carbon graphite shaft sleeve cannot be circumferentially clamped, and the stability of circumferential clamping of the carbon graphite shaft sleeve cannot be improved. Comprising a circumferential positioning assembly, a connecting frame, a connecting screw rod, a locking nut, a frame assembly and a circumferential cutting assembly, the circumferential positioning assembly is connected with the connecting frame, the connecting frame is connected with the connecting screw rod, the connecting screw rod is connected with the locking nut, the connecting frame is connected with the frame assembly, and the circumferential cutting assembly is connected with the frame assembly. The distance between the two parallel circumferential positioning assemblies is adjusted along the connecting frame, so that the two parallel circumferential positioning assemblies clamp different positions of the end face of the carbon graphite shaft sleeve in the circumferential direction, and the stability of circumferential clamping of the carbon graphite shaft sleeve is improved.

Provided herein hybrid organic-inorganic redox active materials and related composites, compositions, electrode materials, electrodes electrochemical cells, batteries, methods and systems, which, can be used as to provide high performance cathode active materials in high capacity, high energy density, safe, and long-lasting electrochemical cells and batteries when coupled with Li, Na, K, graphite, lithiated graphite, in situ lithiated graphite, silicon, lithiated silicon, in situ lithiated silicon, silicon-graphite, in situ lithiated silicon-graphite, hard carbon, sodiated hard carbon, graphite-silicone, lithiated graphite-silicon etc. anodes in non-aqueous electrolytes.

The present invention discloses a biochar / graphene composite material, a preparation method thereof and an application thereof. The method comprises impregnating a biomass raw material with a copper salt solution to obtain a precursor; pyrolyzing the precursor to obtain a biochar material modified with copper oxide, and then, under a reducing atmosphere and high temperature conditions, using carbon dioxide as a carbon source to in-situ generate graphene on the biochar material modified with copper oxide to obtain a biochar / graphene / copper composite material, and the biochar / graphene / copper composite material is obtained by leaching copper treatment. The composite material has excellent electrochemical properties, and when used for preparing a capacitor, has excellent rate performance, capacitance and good cycle service life. The preparation method is simple, low in cost and suitable for industrial production.

An aqueous anode composition may include carbon particles or metal particles and a crosslinkable composition. The crosslinkable composition may include a polycarboxylic polymer combined with an alcohol or an amine. The crosslinkable composition may also include (i) at least one material E chosen among metal fibers, metal particles, carbon graphite fibers, carbon graphite particles and combinations thereof and (ii) at least one cross-linkable aqueous composition R including: (a) at least one polymer A prepared in water by a polymerization reaction of at least one monomer M chosen among acrylic acid, methacrylic acid, an acrylic acid salt, a methacrylic acid salt and combinations thereof, in the presence of at least one initiator compound, and (b) at least one compound B chosen among polyols, polyamines, amino alcohols, (polyamino)alcohols, amino(polyalcohols), oses, osides, and combinations thereof.

The invention discloses a low-temperature lithium ion battery and a preparation method thereof, and relates to the technical field of low-temperature lithium ion batteries, the low-temperature lithium ion battery comprises a positive plate, a negative plate, a diaphragm and an electrolyte, a positive active material coating of the positive plate is titanium and cobalt doped lithium iron phosphate, and a negative active material coating of the negative plate is titanium and cobalt doped lithium iron phosphate; a negative active material coating of the negative plate is made of a hard carbon-graphite mixed material; the preparation method is used for preparing the low-temperature lithium ion battery. Compared with the traditional anode and cathode materials of the lithium iron phosphate lithium ion battery, the anode and cathode materials are improved, the deintercalation rate and migration rate of lithium ions from the anode of the lithium ion battery at low temperature are greatly promoted, and the low-temperature cycle performance of the lithium ion battery is improved.

The invention provides a carbon product electric roasting furnace, a building method and system, a carbon product and a carbon graphite product. The carbon product electric roasting furnace comprises a furnace end area which comprises a head conductive electrode; the furnace tail area comprises a tail conductive electrode; the furnace body area is positioned between the furnace head area and the furnace tail area; the furnace top area is located above the furnace body area, the furnace top area comprises a furnace cover, the furnace cover is provided with a lower surface facing the furnace body area, and the ratio of the weight of the furnace cover to the area of the lower surface ranges from 2 tons / m < 2 > to 6 tons / m < 2 >; and the electrical device is suitable for supplying power to the furnace body area through the head conductive electrode and the tail conductive electrode. According to the carbon product electric roasting scheme, the roasting yield of the carbon product can be greatly improved, and the roasting quality of the product is improved and stabilized.

The application provides a copper interconnection layer and a damascene process method of the copper interconnection layer. The side wall and bottom of a via and a trench for forming a copper interconnection line are formed with a barrier layer, which comprises a metal crystal adhesion layer or a graphene layer. The metal crystal adhesion layer can be a crystal Co layer, a crystal Ru layer or a crystal Os layer. The metal crystal adhesion layer can enhance the adhesion with Cu, effectively inhibit the diffusion of Cu into a dielectric layer and be beneficial to improving the electron migration performance of Cu. The formation of the metal crystal adhesion layer can effectively reduce the total thickness of the barrier layer and a first barrier layer and effectively reduce the resistance of the via. The graphene layer is an amorphous carbon / graphene composite layer. Due to the formation of the graphene layer, the copper interconnection layer has a lower resistivity. The formation of the graphene layer can also effectively reduce the total thickness of the barrier layer or the barrier layer and the first barrier layer and effectively reduce the resistance of the via.

The present invention discloses a large-flow carbon graphite floating ring seal leakage detection structure, comprising: a shell, wherein a hollow accommodating cavity is provided in the shell; a connecting seat with an annular structure, wherein the connecting seat is provided in the accommodating cavity; a shaft sleeve, wherein the shaft sleeve is used to connect a rotating shaft, wherein the shaft sleeve is provided on the inner side of the connecting seat, and wherein the shaft sleeve has two annular structures and axially arranged contact portions; a carbon graphite floating ring sealing device is provided between the contact portions and the connecting seat, and wherein the carbon graphite floating ring sealing device comprises a mounting seat and a graphite floating ring; the mounting seat is connected to the inner side of the connecting seat, wherein the graphite floating ring is provided on the inner side of the mounting seat, and a sealed fitting pair is formed after the graphite floating ring and the contact portion are in surface contact, wherein the graphite floating ring and the contact portion are in sliding fit; a sealed cavity is formed between the two contact portions through the fitting pair; the present invention relates to the field of carbon graphite floating ring seal technology.