16 results about "Tungsten nitride" patented technology

This application relates to a silicon-carbon composite anode material, its preparation method, and its application. The silicon-carbon composite anode material has a core-shell structure, comprising, from the inside out: a core, which is a silicon-carbon composite matrix; an intermediate shell, which is a rigid tungsten nitride layer covering the outer surface of the silicon-carbon composite matrix; and an outer shell, which is a flexible conductive carbon layer covering the outer surface of the intermediate shell. This application proposes using tungsten nitride (W2N) as the inner rigid coating material to form a high-strength, conductive W2N protective layer on the surface of the silicon-carbon composite material, and further coating it with a flexible conductive carbon layer, constructing a "hard shell-soft layer" dual-layer synergistic protection structure, thereby systematically alleviating the key technical challenges of the aforementioned silicon-based anodes.

The invention discloses a tungsten nitride / carbon composite material as well as a preparation method and application thereof. The preparation method adopts a molten salt synthesis method and takes tungsten trioxide as a tungsten source, thiourea as a nitrogen source and a sulfur source, melamine resin as a carbon source and sodium chloride as a molten salt template. Under the room temperature condition, powder obtained through ball milling is subjected to high-temperature roasting through a tubular furnace to prepare the tungsten nitride and carbon composite material, and the pore channel structure and the heteroatom content of the material can be adjusted by controlling the proportion of precursors. The product yield of the method reaches 16%, and the material can be used as the water electrolysis hydrogen production catalyst, and is a very ideal method for preparing the water electrolysis hydrogen production catalyst.

The application belongs to the technical field of catalysts, and relates to a Mott Schottky heterojunction catalytic material and a preparation method and application thereof. The application provides a preparation method of a Mott Schottky heterojunction catalytic material, which uses polyacrylonitrile, Ni(NO3)2.6H2O, WCl6 and an organic solvent as raw materials to obtain a PAN / WCl6 / Ni(NO3)2.6H2O composite nanofiber membrane through electrostatic spinning; and the composite nanofiber membrane is subjected to pre-oxidation and carbonization treatment to prepare the Mott Schottky heterojunction catalytic material. The Mott Schottky heterojunction catalytic material provided by the application has a unique 3D network structure, nickel nanoparticles and tungsten nitride nanowires are uniformly embedded on carbon nanofibers, the formed Mott Schottky heterojunction can significantly promote electron transfer, the carbon matrix ensures structural stability and efficient charge transport, and the Mott Schottky heterojunction catalytic material has excellent HER and SOR bifunctional catalytic activity.

Metal nitride diffusion barriers may be included between cobalt-based structures and ruthenium-based structures to reduce, minimize, and / or prevent intermixing of cobalt into ruthenium. A metal nitride diffusion barrier layer may include a cobalt nitride (CoNx), a ruthenium nitride (RuNx), or another metal nitride that has a bond dissociation energy greater than the bond dissociation energy of cobalt to cobalt (Co—Co), and may therefore function as a strong barrier to cobalt migration and diffusion into ruthenium. Moreover, cobalt nitride and ruthenium nitride have lower resistivity relative to other materials such as titanium nitride (TiN), tungsten nitride (WN), and tantalum nitride (TaN). In this way, the metal nitride diffusion barriers are capable of minimizing cobalt diffusion and intermixing into ruthenium-based interconnect structures while maintaining a low contact resistance for the interconnect structures. This may increase semiconductor device performance, may increase semiconductor device yield, and may enable further reductions in interconnect structure size.

The application discloses a kind of buffer oxide etching solution with high etching uniformity.The main components of the etching solution are hydrofluoric acid, ammonium fluoride, corrosion inhibitor and ultrapure water.The etching solution of the application is used for etching of silicon oxide film, and has little corrosion effect on tungsten nitride layer, and the surface uniformity of tungsten nitride layer is good after etching.The corrosion inhibitor has strong coordination ability and adsorption performance, and the corrosion inhibitor and tungsten nitride surface occur chemical adsorption, forming a protective film, which can prevent the further reaction of etching solution and tungsten nitride.The etching solution of the application has high selectivity to silicon oxide layer and tungsten nitride, and the etching selectivity ratio can be >4000.The etching solution of the application can effectively inhibit the corrosion of tungsten nitride, while ensuring the surface uniformity of tungsten nitride after etching of silicon oxide.

The application discloses a method for preparing two-dimensional metal nitride by using bulk metal oxide powder, which comprises the following steps: 1) uniformly mixing and grinding metal oxide powder with alkali metal carbonate or alkali metal hydroxide; adding neutral alkali metal or alkali earth metal halide salt, and uniformly mixing and grinding again; 2) performing heat preservation reaction on the mixture obtained in the step 1) under ammonia atmosphere, and cooling; 3) performing acid washing on the reaction product obtained in the step 2), washing to neutral, performing suction filtration and centrifugation, and drying, so as to obtain two-dimensional metal nitride in nanosheet shape. The application firstly proposes a method for preparing two-dimensional metal nitride nanosheet by using alkaline-neutral mixed double salt as an auxiliary, and the alkali metal carbonate or alkali metal hydroxide is used as a reactant to synthesize an intermediate of alkali metal oxide with two-dimensional layer-like structure, and the neutral alkali metal or alkali earth metal halide salt is used as a molten salt auxiliary agent to promote the nitridation conversion of the alkali metal oxide. The method is suitable for preparing two-dimensional niobium nitride by using bulk niobium oxide, two-dimensional tungsten nitride by using bulk tungsten oxide, and two-dimensional molybdenum nitride by using bulk molybdenum oxide, and is related to a simple process and low cost.

The invention relates to the technical field of metallurgy, and particularly discloses a material modifier for ultrahigh-chromium high-carbon cast iron, the ultrahigh-chromium high-carbon cast iron and a smelting method of the ultrahigh-chromium high-carbon cast iron. The material modifier for the ultrahigh-chromium high-carbon cast iron is alloy metal powder and comprises the following raw materials in parts by weight: 6-8 parts of ferroniobium powder, 0.2-0.4 part of chromium nitride, 0.2-0.4 part of tungsten nitride, 0.15-0.25 part of vanadium nitride, 0.3-0.5 part of molybdenum nitride, 0.5-1.5 parts of chromium carbide and 3-5 parts of silicon carbide. The impact toughness and Rockwell hardness of the ultrahigh-chromium and high-carbon cast iron using the material modifier for the ultrahigh-chromium and high-carbon cast iron are as high as 4.90 J / cm < 2 > and 68.5 HRC, the toughness and hardness of the ultrahigh-chromium and high-carbon cast iron are improved, the minimum wear rate is 0.30%, and the ultrahigh-chromium and high-carbon cast iron has high wear resistance.

This invention belongs to the field of titanium nitride tungsten oxide composite films, and specifically relates to a method for preparing titanium nitride powder, titanium nitride tungsten oxide composites, and their composite films. A method for preparing titanium nitride powder includes the following steps: titanium tetrachloride is mixed with ethanol, nanocellulose, polyvinylpyrrolidone, tetrabutyl titanate, and ethanol; the mixture is heated and calcined; the calcined material is collected, ground, and placed in a plasma reaction vessel; after plasma arc discharge treatment, it is naturally cooled and then ball-milled to obtain titanium nitride powder. This application optimizes powder performance through component synergy and process integration. Simultaneously, it introduces tetrabutyl titanate, nanocellulose, and polyvinylpyrrolidone to construct a composite system, utilizing coordination and doping effects to regulate the microstructure of the powder from the source, effectively improving the dispersion stability and activity of the titanium nitride powder, laying a high-quality raw material foundation for the subsequent preparation of composites and composite films.

Provided herein are methods of forming tungsten nitride (WN) barrier layers in features. Wafers may be loaded into a multi-station process chamber and metal is deposited into features. Deposition may occur across multiple stations to improve wafer to wafer uniformity. Preheating of wafers may be performed prior to deposition operations to improve metal layer properties.

The application provides a method for chemical vapor deposition of tungsten, which adopts a two-step nucleation method combined with a cyclic deposition process, that is, after forming a tungsten nitride layer for inhibiting the growth speed of tungsten, first, diborane is used to adsorb on the surface of the tungsten nitride layer to form high-activity nucleation sites, then, tungsten hexafluoride is introduced to react to form a first tungsten nucleation layer, then, the cyclic step of adsorption of silane and reaction with tungsten hexafluoride is repeated for multiple times, so as to form a second tungsten nucleation layer with a preset thickness by layer-by-layer accumulation, and finally, a tungsten main body layer is deposited, thereby effectively solving the problem that in the prior art, due to the discontinuous coverage or insufficient thickness of the nucleation layer at the bottom of a high-aspect-ratio contact hole, the hole is prematurely closed, and the internal part of the tungsten main body layer as a filling layer forms a hollow or a gap defect.

This book describes memory devices and methods for manufacturing memory devices. A memory device includes a bit-wire metal stack on a surface that includes a matrix of conductive bit-wire contacts (e.g., polysilicon) and insulating dielectric islands (e.g., silicon nitride (SiN)). The bit-wire metal stack includes one or more of titanium (Ti), tungsten (W), tungsten nitride (WN), tungsten silicide (WSi2), or tungsten silicon nitride (WSiN). A memory device includes a bit-wire metal layer (e.g., tungsten (W)) on the upper surface of the insulating dielectric islands and on the bit-wire metal stack.

Embodiments of methods and related apparatus for filling features of a substrate are provided herein.SOLUTION: In some embodiments, a method of filling a feature of a substrate includes depositing a seed layer of tungsten nitride in the feature via a physical vapor deposition (PVD) process, depositing a liner layer of tungsten on the seed layer of tungsten nitride in the feature via a PVD process, and subsequently filling the feature with a tungsten bulk fill via a chemical vapor deposition (CVD) process.SELECTED DRAWING: Figure 1

Metal nitride diffusion barriers may be included between cobalt-based structures and ruthenium-based structures to reduce, minimize, and / or prevent intermixing of cobalt into ruthenium. A metal nitride diffusion barrier layer may include a cobalt nitride (CoNx), a ruthenium nitride (RuNx), or another metal nitride that has a bond dissociation energy greater than the bond dissociation energy of cobalt to cobalt (Co—Co), and may therefore function as a strong barrier to cobalt migration and diffusion into ruthenium. Moreover, cobalt nitride and ruthenium nitride have lower resistivity relative to other materials such as titanium nitride (TiN), tungsten nitride (WN), and tantalum nitride (TaN). In this way, the metal nitride diffusion barriers are capable of minimizing cobalt diffusion and intermixing into ruthenium-based interconnect structures while maintaining a low contact resistance for the interconnect structures. This may increase semiconductor device performance, may increase semiconductor device yield, and may enable further reductions in interconnect structure size.

The invention provides high-purity nanoscale tungsten nitride powder and a preparation method thereof. The tungsten nitride is WN or W2N or a mixed phase of the WN and the W2N, the powder purity is larger than or equal to 99.99%, and the powder particle size is 20-200 nm. The preparation method comprises the following steps that metal tungsten serves as a raw material, sintering is conducted for 3-10 h in a radio frequency furnace at the temperature of 900-1200 DEG C, then the treated raw material is pretreated in a box-type furnace, the pretreated powder is sintered for 5-10 h in a rotary furnace at the temperature of 550-700 DEG C in the NH3 environment, the powder is cooled to the room temperature, discharged out of the furnace and then subjected to planetary ball milling, crushing and screening in the inert atmosphere, and the tungsten-based composite material is obtained. The high-purity tungsten nitride powder is obtained. The prepared tungsten nitride powder is stable in structure, high in purity, simple in preparation process, easy to crush, low in operation cost, wide in process window and suitable for large-scale industrial production. The prepared tungsten nitride can be widely used in the fields of catalysis, wear-resistant coatings, electronics, optics and the like.

The invention discloses a composite material for an electrode, a pre-metallization method of the composite material, a pre-metallized electrode complex and a metal battery, and belongs to the technical field of secondary batteries. The composite material for the electrode comprises a current collector base material, wherein at least one side surface of the current collector base material is provided with an activated metal layer; in the thickness direction of the base material, a gradient conductive energy storage layer is arranged on the activated metal layer, a tungsten nitride layer is arranged on the gradient conductive energy storage layer, and a ceramic coating is arranged on the tungsten nitride layer; the gradient conductive energy storage layer is a porous structure coating, and the electronic conductivity is gradually weakened from the side of the activated metal layer to the side of the tungsten nitride coating. The composite material for the electrode has the characteristics of large specific surface area, high porosity and high pore volume, the local current density of the electrode can be effectively reduced, the ion flux can be homogenized, metal dendrites can be effectively inhibited through pre-metallization treatment, the volume change can be relieved, stable circulation of the battery can be realized, and the cycle life of the battery can be effectively prolonged.