20 results about "Chromium carbide" patented technology

The present application relates to the technical field of electrodeposited chromium plating, in particular to a trivalent chromium plating layer with a pearl shell biomimetic structure and a preparation method thereof. By regulating the composition of plating solution and electrodeposition process, stable periodic concentration polarization is induced to form potential composition distribution along the thickness direction of amorphous precursor plating layer; after annealing at 350-450 DEG C for 0.5-1 h, the potential composition modulation is explicit and phase transition occurs, and the pearl shell biomimetic layered structure is constructed in situ. The plating layer presents a periodic and alternating arrangement of natural pearl shell "hard-soft" multilayer stacked biomimetic layered structure in microcosm, wherein the chromium layer is a metallic chromium crystalline layer with a thickness of 5-30 nm; the carbon / carbon-chromium mixture layer is amorphous or nanocrystalline with carbon enrichment and in-situ formed chromium carbide phase, with a thickness of 1-3 nm. The total thickness of the plating layer is 5-30 microns, and the number of layers reaches 300-1800 layers. The structure can hinder crack propagation and improve load transfer, so that the plating layer has high hardness and wear resistance. Moreover, the process is environmentally friendly and controllable, and is suitable for mechanical parts, molds and functional surface protection.

This utility model discloses a wear-resistant hammerhead for a crusher, specifically relating to the field of hammerhead technology. It includes a hammer handle with a reinforcing connecting assembly. The reinforcing connecting assembly includes a hammerhead body located at one end of the hammer handle. A guide slope is formed at one end of the hammerhead body, and a reinforcing carbonized wear-resistant plate is welded onto the guide slope. This utility model uses the guide slope to ensure that the force point of the crushing action is concentrated at a specific location when the hammerhead body rotates, achieving more targeted crushing. Furthermore, the reinforcing carbonized wear-resistant plate and reinforcing chromium carbon strip improve the wear resistance of both the guide slope and the hammerhead body. The addition of a reinforcing side abutment plate positions the reinforcing carbonized wear-resistant plate welded onto the guide slope, preventing it from detaching and ensuring the stability of the reinforcing carbonized wear-resistant plate under stress during crushing.

The present invention relates to an external part (10) comprising a substrate (100) having a support face (101) made of chromium carbide Cr x C y with a complex refractive index at a wavelength of 550 nm having a real part n > 1 and an imaginary part k < 1.5, on which support face a thin-film dielectric coating (110) is deposited, formed by at least one alternation of layers made of TiO2 and Al2O3, and comprising a terminal layer (111) made of TiO2 and a base layer (112) made of TiO2 or Al2O3 covering the support face (101).

This utility model discloses a wear-resistant trolley funnel liner. The liner includes a base layer and a weld overlay layer. The weld overlay layer is welded to the surface of the base layer. The base layer and the weld overlay layer are formed into an integral structure using a multi-layer weld overlay process. Each weld overlay layer is tightly bonded to the adjacent layer and the base layer, forming a continuous and dense composite structure. The base layer is made of low-carbon steel to ensure that the liner has sufficient strength and toughness to withstand material impact. The weld overlay layer is made of chromium carbide alloy to provide good wear resistance. The low-carbon steel of the base layer has good toughness and can absorb and disperse impact energy; while the chromium carbide alloy layer of the weld overlay layer has high hardness and can resist direct impact and wear from materials. This greatly enhances the impact resistance of the liner, reduces deformation and cracking caused by material impact, ensures the normal use of the funnel, and avoids environmental pollution and material waste caused by material leakage.

The present application belongs to the technical field of hard alloy material, and particularly relates to a hard alloy for hard rock tooth and a preparation method thereof. The method comprises the following steps: mixing coarse tungsten carbide powder, submicron tungsten carbide powder, cobalt powder, nickel powder, chromium carbide powder, vanadium carbide powder, tantalum carbide powder, niobium carbide powder, dimolybdenum carbide powder, graphite powder, tantalum-niobium-zirconium composite carbide solid solution pinning body and yttrium-doped cerium oxide toughening control body, ball milling, drying, crushing, sieving, granulating, die pressing, cold isostatic pressing, degreasing, vacuum sintering, hot isostatic pressing treatment, grinding, cleaning and drying. The present application can inhibit grain growth by multiple carbides, and can improve the grain boundary and binder phase distribution by using rare earth oxides, so that the obtained hard alloy has good wear resistance, impact resistance and anti-chipping performance, and is suitable for hard rock tooth.

To provide brake discs that are highly resistant to corrosion and wear, less prone to delamination and interlayer break-up, and ensure thermal and mechanical performance, thereby demonstrating long-term reliability. [Solution] The brake band is made of gray cast iron or steel, and the disc has a base layer that covers at least one of the two braking surfaces of the brake band. The base layer consists of a titanium and / or titanium alloy matrix containing one carbide and defines the tribologically active surface of the disc. Alternatively, the base layer consists of a layer of titanium and / or titanium alloy, and the coating layer on top of it consists of a layer based on one or more carbides and defines the tribologically active surface of the disc. The one or more carbides are selected from the group consisting of titanium carbide, tungsten carbide, chromium carbide, niobium carbide, molybdenum carbide, and silicon carbide. An intermediate fusion layer exists at the interface between the base layer and the gray cast iron or steel brake band. The base layer has a crystalline structure, and its growth direction is mainly perpendicular to the braking surface.

The present application relates to a kind of high mechanical property regenerated silk and its preparation method.The method includes the following steps: (1) preparation material: preparation chromium carbide (Cr3C2) suspension liquid;(2) preparation functional regenerated silk (RSF) fiber: Cr3C2 suspension liquid is mixed with silk fibroin solution, by wet spinning method, preparation functional Cr3C2 / RSF fiber composite.Cr3C2 significantly enhances the mechanical property of RSF and the absorption effect to ultraviolet light, reflects its excellent anti-ultraviolet performance.When not doped Cr3C2, the breaking strength of RSF fiber is 203.32±5.22Mpa, and after doping, the breaking strength is enhanced to 313.23±3.68MPa.After ultraviolet aging treatment, the breaking strength of RSF fiber is reduced to 126.54±4.88Mpa, and the breaking strength of Cr3C2 / RSF is 263.42±4.30Mpa.The composite fiber has good stability and biological safety, and has good application potential in the field of biomedical and functional textiles.

The invention relates to a disc for a disc brake, the disc comprising a braking band equipped with opposite braking surfaces, the braking band being made of grey cast iron or steel, the disc comprising a base layer covering at least one of the two braking surfaces of the braking band. The base layer comprises a titanium matrix and / or a titanium alloy containing one or more carbides and defines the tribologically active surface of the disc; alternatively, the base layer comprises a layer of titanium and / or a titanium alloy, and the base layer is in turn covered by a coating layer which comprises a layer based on one or more carbides and defines the tribologically active surface of the disc. The one or more carbides are selected from the group consisting of titanium carbide, tungsten carbide, chromium carbide, niobium carbide, molybdenum carbide, silicon carbide. An intermediate fusion layer with mixed composition between the base layer and the braking band of grey cast iron or steel is provided at the junction between the base layer and the braking band, the base layer having a crystal structure with a growth direction mainly orthogonal to the braking surface.

This invention relates to the field of fastener technology and proposes a high-strength corrosion-resistant bolt and its preparation method. A high-strength corrosion-resistant bolt comprises a matrix and a reinforcing phase. The matrix is ​​composed of the following components by weight percentage: C 0.20%~0.30%, Mn 0.35%~0.55%, Mo 0.15%~0.25%, W 0.08%~0.16%, Al 0.10%~0.15%, B 0.02%~0.10%, Y 0.03%~0.15%, P≤0.02%, S≤0.02%, with the balance being iron and unavoidable impurities. The reinforcing phase is a metal carbide, including titanium carbide and chromium carbide. The weight ratio of the matrix to the reinforcing phase is 100:3~6. This technical solution solves the problem of insufficient improvement in the mechanical properties of bolts in related technologies.

The utility model discloses a kind of surface strengthening high-chrome balls, it is related to high-chrome ball technical field, including sphere, the sphere surface is provided with each other crossing vertical first reinforcing bar and second reinforcing bar, the cross section of first reinforcing bar and second reinforcing bar is semicircular;The surface strengthening high-chrome ball;By setting cross reinforcing bar, improve wear resistance and shear force, optimize polishing efficiency;Polishing surface and boss structure reduce speed, enhance collision rotation effect;Bump design promotes shear force, so that polishing is more fine;Reinforcing bar uses chromium carbide outer layer and nitriding inner layer, with high wear resistance and corrosion resistance;Boss's connecting layer and polishing layer structure improve impact resistance and fatigue resistance, prolong service life.

The present application relates to the technical field of carbon coating, and discloses a graphite device surface composite tantalum carbide coating and a coating method thereof, which comprises a carbon layer, an intermediate tantalum carbide layer and a tantalum carbide outer layer arranged in sequence along the graphite device surface outward; the intermediate tantalum carbide layer is obtained by reacting tantalum oxide, tantalum carbide and PVA glue in any proportion; and the tantalum carbide outer layer is obtained by reacting 2-8% of the mass fraction of tantalum chloride, 0.3-0.8% of the mass fraction of chromium carbide, 2-10% of the mass fraction of PVA glue and 15-25% of the mass fraction of ethylene glycol. The graphite device surface composite tantalum carbide coating in the present application can form a graphite device surface composite tantalum carbide coating with stronger binding force and higher surface finish through the mutual bonding effect between the multiple composite coatings, and the preparation process conditions are relatively lower.

The application provides a preparation process of a light-weight aluminum alloy hub, relates to the field of aluminum alloy materials and application technologies, and comprises the following steps: mixing and heating carbon steel and pig iron to melt, adding high-carbon manganese iron, medium-carbon chromium iron and silicon iron, refining by heating, adding aluminum powder, entering a mold, demolding by cooling, homogenizing by heating, quenching, cooling and obtaining a mother plate; mixing bismaleimide, composite powder and sepiolite fiber, stirring after heating, coating on the mother plate, applying negative pressure first, then applying positive pressure, heating, cooling and obtaining a base layer; sputtering on the base layer to obtain a chromium nitride functional layer, cooling and obtaining a high-wear-resistance alloy lining plate; the composite powder is prepared by mixing and heating chromium carbide powder and hydrogen peroxide solution, filtering, mixing with an ethanol solution and gamma-aminopropyl triethoxysilane, heating, condensing and refluxing, washing and drying, mixing with an amino-terminated polyether and N,N-dimethylformamide and heating; and the application can improve the wear-resistance stability of the alloy lining plate.

This invention belongs to the field of magnetic functional materials technology, specifically relating to a high rectangle ratio amorphous alloy and its preparation method. The high rectangle ratio amorphous alloy is composed of the following components by mass percentage: Cu 1.3-1.35 wt%, Nb 4.8-5.6 wt%, Si 6.4-7.2 wt%, B 1.92-2 wt%, Nd 0.5-0.8 wt%, modified chromium carbide 0.2-0.6 wt%, with the balance being Fe. This invention, through precise control of the alloy composition and the introduction of modified chromium carbide, synergistically enhances the alloy's amorphous forming ability, soft magnetic properties, and mechanical properties. The prepared high rectangle ratio amorphous alloy possesses high hardness, high saturation magnetic induction, low coercivity, and a high rectangle ratio.

This invention belongs to the field of high-pressure jet cutting nozzle manufacturing technology, specifically relating to a cemented carbide for jet abrasive nozzles and its preparation method. The cemented carbide for jet abrasive nozzles includes a cemented carbide matrix and a boride coating. The composition of the cemented carbide matrix is: 1wt%~3wt% cobalt, 3wt%~12wt% molybdenum carbide, 3wt%~10wt% tantalum carbide, 1wt%~3wt% chromium carbide, with the balance being tungsten carbide and unavoidable impurities. The average grain size of the tungsten carbide is 0.2~0.6μm. This invention prepares a high-strength and tough cemented carbide matrix by using a low-cobalt ultrafine-grained cemented carbide with a specific composition and a gas pressure sintering process. Then, a TiB2 superhard coating with a strong (001) texture is deposited on its surface by a controllable chemical vapor deposition technology, achieving a unity of ultra-high coating hardness and extremely high interfacial bonding force, and finally obtaining a jet abrasive nozzle composite material with excellent wear resistance, long service life, and stable performance.

The present invention relates to an abrasive for blast cutting, having particles consisting of a stainless steel, the stainless steel consisting of a microstructure, the microstructure at least containing: martensite, in particular in a range of ≥ 20 wt.% to ≤ 100 wt.%; austenite in a range of ≥ 0 wt.% to ≤ 50 wt.%; and chromium carbide, chromium nitride and / or mixtures thereof, together in a range of ≥ 0 wt.% to ≤ 45 wt.%, in relation to the microstructure, the percentages being selected such that they add up to ≤ 100 wt.% in relation to the microstructure. The abrasives for blast cutting have particularly good creep strength and reusability. The invention also relates to a suspension for blast cutting, containing at least the proposed abrasive for blast cutting and a suspending agent, and to the use of the abrasive for blast cutting for cutting a workpiece.

The application belongs to the technical field of hard alloy, and particularly relates to a high-cobalt superfine hard alloy and a preparation method thereof. The preparation method comprises the following steps: S1, obtaining tungsten carbide powder, cobalt powder, vanadium carbide powder and chromium carbide powder, performing first ultrasonic cell disruption on the tungsten carbide powder to obtain first mixed material, performing second ultrasonic cell disruption on the vanadium carbide powder to obtain second mixed material, and adding the second mixed material into the first mixed material to perform third ultrasonic cell disruption to obtain third mixed material; performing centrifugal spraying on the third mixed material to obtain WC-VC composite powder; S2, performing first ball milling on the cobalt powder and the chromium carbide powder to obtain first slurry; performing second ball milling on the WC-VC composite powder to obtain second slurry; adding the first slurry into the second slurry to perform third ball milling to obtain third slurry; S3, performing drying, pressing and sintering on the third slurry to obtain the high-cobalt superfine hard alloy. The high-cobalt superfine hard alloy with excellent performance is prepared through VC coating and Cr3C2 pre-solid solution.

To provide an exterior component that includes a lamination of interference layers deposited on a surface made of chromium carbide. [Solution] The present invention relates to an exterior part (10) of chromium carbide Cr, wherein the real part n of the complex refractive index at a wavelength of 550 nm is >1 and the imaginary part k is <1.5. x C y The present invention relates to an exterior component (10) comprising a substrate (100) having a support surface (101) made of TiO2, wherein a thin-film dielectric coating (110) is deposited on the support surface (101) by alternating stacking of at least one TiO2 layer and an Al2O3 layer, and includes a TiO2 terminal layer (111) and a TiO2 or Al2O3 base layer (112) covering the support surface (101).

This invention discloses a nano-deposited, heavy-duty anti-corrosion graphene composite nano-coating, which is composed of the following components by weight: 66-82 parts of a polyimide-toughened polyphthalonitrile resin composition solution; 1-2 parts of nano-calcium silicate; 1-2 parts of nano-silicon nitride; 1-2 parts of graphene; 3-5 parts of 1,3,5-tris(trimethoxysilylpropyl)isocyanurate; 2-3 parts of lead powder; 1-2 parts of chromium carbide powder; 1-2 parts of tungsten powder; 1-2 parts of cobalt powder; 1-2 parts of silicon carbide; 1-2 parts of tungsten carbide powder; 1-2 parts of nickel powder; 1-2 parts of boron powder; 1-2 parts of rhenium powder; 1-2 parts of zirconium carbide powder; and 1-2 parts of zirconium oxide powder. After baking, cross-linking, and curing, the coating forms a powder coating with properties such as high temperature resistance, resistance to rapid heating and cooling, fire resistance and scorching prevention, heat insulation and heat dissipation, resistance to damp heat, salt spray resistance, impact resistance, and low friction.

To provide a brake disc for disc brakes that is resistant to corrosion and wear, and at the same time less prone to delamination and interlayer delamination. [Solution] The brake band is made of gray cast iron or steel, and the disc includes a bonding layer. The base layer consists of a titanium or titanium alloy matrix containing one or more carbides and defines the tribologically active surface of the disc. The coating layer, consisting of layers of titanium or titanium alloy, consists of layers based on one or more carbides and forms the tribologically active surface of the disc. The carbides are selected from the group consisting of titanium carbide, tungsten carbide, chromium carbide, niobium carbide, molybdenum carbide, and silicon carbide. The bonding layer consists of a titanium layer or a titanium or steel alloy layer. A first intermediate fusion layer exists at the interface between the bonding layer and the gray cast iron or steel brake band, and a second intermediate fusion layer exists at the interface between the base layer and the bonding layer. The base layer and the bonding layer have a crystalline structure, and their growth directions are approximately perpendicular to the brake surface.