110 results about "Chromium carbide" patented technology

The invention relates to the technical field of flux-cored wires. The preparation method comprises the following steps: weighing the following raw materials in parts by weight: 4-6 parts of chromium carbide powder, 7-9 parts of molybdenum powder, 6-8 parts of nickel powder, 10-15 parts of niobium powder, 15-18 parts of tungsten carbide powder, 7-11 parts of a modified titanium carbide agent, 5-8 parts of a blending agent added based on boron and 2-4 parts of 30-mesh natural graphite; 1-2 parts of sodium fluosilicate; 1-2 parts of aluminum powder; and 70-75 parts of iron powder. The flux-cored wire can adapt to complex service environments of parts such as rollers and continuous casting crystallizers in the metallurgical industry, the service life of the parts subjected to surfacing repair is prolonged, the production efficiency of the parts subjected to surfacing repair is improved, the obtained flux-cored wire achieves balance of high-temperature performance, mechanical performance and low-temperature stability, and the comprehensive applicability of products is improved.

The invention relates to the technical field of material science, and discloses a slurry valve erosion-resistant multi-layer coating with gradient function design and a preparation method thereof.The coating comprises a bonding layer, a gradient function layer and an erosion-resistant surface layer which are sequentially arranged from inside to outside, the bonding layer is composed of nickel-based alloy or cobalt-based alloy, the thickness of the bonding layer is 50-100 micrometers, and the thickness of the gradient function layer is 50-100 micrometers. The gradient functional layer is made of composite powder of metal and ceramic, the metal is nickel or cobalt, the ceramic is tungsten carbide or chromium carbide, and the components of the gradient functional layer are from the bonding layer side to the erosion-resistant surface layer side; the bonding layer is arranged and forms firm metallurgical bonding with the matrix, the interface stress is reduced, the basic reliability of bonding of the coating and the matrix is guaranteed, meanwhile, the gradient functional layer with the metal and ceramic volume fraction gradually changing continuously is adopted, the problem that the thermal expansion coefficients of the coating and the matrix are not matched is solved, and the service life of the coating is prolonged. And the crack initiation and expansion risk caused by internal stress concentration is reduced, so that the long-term stability of the coating structure is ensured.

The application discloses a kind of hard alloy cutter materials for deep hole machining, the cutter material is composed of the following weight percentage components: tungsten carbide: 75%~85%, wherein 0.2~0.4 μm superfine tungsten carbide particles account for 60%~80%, 0.4~0.8 μm tungsten carbide particles account for 20%~40%; Cobalt: 10%~15% titanium carbide: 2%~5%; Tantalum carbide: 1%~3%; Niobium carbide: 0.5%~2%; Vanadium carbide: 0.3%~1.0%; Chromium carbide: 0.2%~0.8%; Rare earth element: Y2O3 Or La2O3: 0.1%~0.5%. The application breaks through the bottleneck of high temperature wear, insufficient strength and short service life of traditional hard alloy in deep hole machining through three-dimensional innovation of component design, structure control and surface strengthening, and provides an efficient solution for precision deep hole machining of high hardness materials.

The invention relates to the technical field of material surface engineering and metallurgical equipment, in particular to a composite coating for prolonging the service life of a crystallizer copper plate and a plasma spraying preparation method thereof.The composite coating comprises, by mass, 35%-55% of chromium, 20%-55% of nickel, 5%-10% of titanium diboride, 0.1%-0.3% of niobium and the balance chromium carbide and inevitable trace impurity elements. According to the invention, titanium diboride and chromium carbide are used as main hard reinforcing phases, so that the coating shows excellent wear resistance at normal temperature and high temperature; a hollow graphite electrode is adopted in the spraying process, plasma arc is generated, and meanwhile an ablation product (carbon) provides a carbon source for formation of chromium carbide; the titanium powder and the boron powder are subjected to an in-situ reaction in a plasma arc to generate titanium diboride, and the in-situ synthesis technology enables hard phase particles to be fine and uniformly distributed, and forms a firm interface with a metal binding phase, so that the problems of interface pollution and weak combination caused by the addition of the hard phase are avoided.

The invention provides a preparation method of a high-wear-resistance alloy lining plate, and relates to the technical field of wear-resistance alloys, carbon steel and pig iron are mixed, heated and melted, high-carbon ferromanganese, medium-carbon ferrochrome and ferrosilicon are added, heating refining is carried out, aluminum powder is added, the mixture is put into a mold, cooling and demolding are carried out, heating homogenization, quenching and cooling are carried out, and a mother plate is prepared; mixing bismaleimide, the composite powder and sepiolite fibers, heating and stirring, coating a mother board with the mixture, firstly applying negative pressure, then applying positive pressure, heating and cooling to obtain a substrate layer; and placing the mother board in magnetron sputtering equipment, sputtering on the substrate layer to obtain a chromium nitride functional layer, and cooling to obtain the high-wear-resistance alloy lining board. The composite powder is prepared by mixing and heating chromium carbide powder and a hydrogen peroxide solution, filtering, mixing with an ethanol solution and gamma-aminopropyltriethoxysilane, heating, condensing and refluxing, washing and drying, and mixing and heating with amine-terminated polyether and N, N-dimethylformamide. The wear-resistant stability of the alloy lining plate can be improved.

The invention discloses a non-stick cooker, a composite film layer structure adopted by the non-stick cooker, target material slurry and a method. The non-stick cooker comprises a base layer, a middle hardening layer and a functional surface layer which sequentially cover a cooker base body from inside to outside. The functional surface layer is a composite film layer formed by codeposition of chromium carbide and carbon fluoride (CFX, x is greater than or equal to 0.75 and less than or equal to 0.95), the mass ratio of the chromium carbide is 50-70%, and the mass ratio of the carbon fluoride is 20-40%. According to the non-stick cooker and the composite film layer structure, the target material slurry and the method adopted by the non-stick cooker, the previous hydrophobic non-stick mode depending on a film layer bionic microstructure is eliminated, and the non-stick purpose is achieved in the mode that extremely low surface energy is formed purely depending on material innovation.

The invention discloses blast furnace stemming and a preparation method thereof. The invention discloses a high-temperature-resistant wear-resistant coating which is characterized by comprising the following components in parts by weight: 380-420 parts of brown aluminum oxide, 70-90 parts of a carburant, 50-70 parts of Guangxi white mud, 110-150 parts of silicon carbide, 15-30 parts of asphalt powder, 5-30 parts of vanadium carbide or chromium carbide or a mixture of vanadium carbide and chromium carbide or pore-forming vanadium chromium carbide and 50-100 parts of liquid resin. The blast furnace stemming disclosed by the invention has relatively high high-temperature breaking strength, normal-temperature compression strength and normal-temperature breaking strength, and excellent slag and molten iron erosion resistance and molten iron scouring resistance.

The application belongs to the field of detection and analysis, and particularly relates to a method for detecting free carbon in cemented carbide mixture based on pretreatment, which comprises the following steps: S1, obtaining cemented carbide mixture, the components of the cemented carbide mixture including at least one of chromium carbide, silicon carbide and boron carbide, and grinding the cemented carbide mixture into cemented carbide mixture powder; S2, mixing, stirring and centrifugally separating the cemented carbide mixture powder and heavy liquid to obtain a mixture; taking out the upper layer liquid containing elemental carbon of the mixture and washing and solid-liquid separating to obtain an initial sample to be detected; S3, rinsing and drying the initial sample to be detected to obtain a final sample to be detected, and detecting the final sample to be detected to obtain the content of free carbon. Through the improved pretreatment detection method of free carbon in cemented carbide mixture, the accuracy and efficiency of detection are improved, the range of detection of free carbon in cemented carbide is expanded, and the method is suitable for more kinds of carbides.

The invention discloses a metal powder type flux-cored wire suitable for 1500MPa-grade hot-formed steel, which is characterized by comprising a carbon steel sheath and a welding wire flux core wrapped in the carbon steel sheath, and the welding wire flux core comprises the following components in percentage by weight: 6-12% of electrolytic manganese, 6-12% of silicon carbide, 6-12% of silicon carbide, 6-12% of silicon carbide, 5-10% of silicon carbide and the balance of iron. 6%-10% of high-carbon ferromanganese; 3%-6% of chromium carbide; 18%-28% of nickel powder; 0.5%-1.5% of silicon carbide; 0.4% to 0.8% of high-purity ferrotitanium; 0.5%-1.5% of rare earth ferrosilicon; 2%-5% of ferrosilicon powder; 6%-10% of molybdenum powder; 0.2% to 0.5% of lithium fluoride; 0.1%-0.3% of titanium-boron alloy and the balance of gas atomization iron powder. The welding wire has the advantages of being good in weldability, high in tensile strength, good in crack resistance and the like. According to the mechanical properties of deposited metal, the tensile strength is larger than or equal to 1040 MPa, the yield strength is larger than or equal to 960 MPa, AKV2 at-40 DEG C is larger than or equal to 27 J, and the ductility is larger than or equal to 13%. The tensile strength of a welded joint obtained by welding 1500MPa hot-formed steel through a lap joint test is greater than or equal to 950MPa, and a fracture position is a heat affected zone of a base metal part.

The invention relates to an electrical connector (1), especially an electrical plug connector, comprising a connecting part (1a) and a coupling part (1b) which each have a metallic contact region (2, 2'), wherein the connecting part (1a) is electrically conductively connectable to the coupling part (1b) via the metallic contact regions (2, 2'), and wherein at least one of the metallic contact regions (2, 2') at least partially comprises a layer system (3) applied by a PVD process. The layer system (3) comprises a first layer (3a) of titanium or chromium arranged in the metallic contact region (2, 2') and an at least one second layer (3b) arranged on the first layer (3a) and formed either from carbon-doped titanium and / or chromium or alternatively formed from a carbide comprising titanium carbide and / or chromium carbide, and at least one third layer (3c) arranged on the at least one second layer (3b) and composed of a hydrogen-free tetrahedral amorphous carbon having an sp3 content of greater than 50% as bonding type, undoped or doped with at least one element from the group comprising copper, tungsten, molybdenum, chromium, silver, titanium, iridium, gold, silicon in a concentration in the range from 2 to 30 at%.

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.

The invention discloses a match-grinding-free quick forming process for a valve element and a valve sleeve of a servo valve, and relates to the technical field of servo valve machining and forming. Step 2, material inspection; step 3, surface treatment; step 4, ultrasonic cleaning; step 5, clamping the part; step 6, vacuumizing; seventhly, argon ion bombardment cleaning is conducted; 8, depositing a chromium base layer; 9, depositing a gradient chromium carbide transition layer; 10, depositing a hydrogenated diamond-like carbon top layer; and eleventhly, cooling and discharging are conducted. According to the match-grinding-free quick forming process for the valve element and the valve sleeve of the servo valve, the machining period of a sliding valve assembly can be shortened by 30%, the material cost is reduced by 80%, and the interchangeability of the valve sleeve and the valve element in the sliding valve assembly is achieved.

This invention relates to the fields of materials surface engineering and metallurgical equipment technology. Specifically, it relates to a composite coating for improving the lifespan of copper plates in crystallizers and its plasma spraying preparation method. The chemical composition, by mass percentage, includes: 35%-55% chromium, 20%-55% nickel, 5%-10% titanium diboride, 0.1%-0.3% niobium, with the balance being chromium carbide and unavoidable trace impurities. In this invention, titanium diboride and chromium carbide are used as the main hard reinforcing phases, enabling the coating to exhibit excellent wear resistance at both room temperature and high temperature. During the spraying process, a hollow graphite electrode is used, generating a plasma arc. Simultaneously, the ablation products (carbon) provide a carbon source for the formation of chromium carbide. Titanium powder and boron powder undergo an in-situ reaction in the plasma arc to generate titanium diboride. This in-situ synthesis technology results in fine and uniformly distributed hard phase particles, forming a strong interface with the metal binder phase, avoiding the problems of interface contamination and weak bonding caused by externally added hard phases.

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 invention relates to the technical field of chemical vapor deposition equipment, and discloses novel chromium carbide coating equipment and method, and the equipment comprises a heating system, a reaction deposition system, a gas control system, a pressure control system, a gas stirring dispersion system and a chlorination reaction tank; the reaction deposition system comprises a reaction deposition chamber with a pressure detection assembly and a temperature detection assembly; a loading disc for loading workpieces is arranged in the reaction deposition chamber; the gas control system comprises at least two independent gas control pipelines; the gas stirring and dispersing system comprises a rotatable gas outlet rod and a rotating device for driving the gas outlet rod to rotate; the chlorination pipeline and the main gas pipeline are isolated through a sealing isolation part before entering the gas outlet rod; and the chlorination reaction tank is used for loading chromium particles and chlorinating the chromium particles to generate gaseous chromium chloride. According to the method, efficient, uniform and stable preparation of the high-performance chromium carbide coating can be achieved.

Tool for ultrasonic welding device, comprising a carrier body (1) made of metal with a contact surface facing a component to be welded, which is provided with a diamond layer (3), wherein the diamond layer (3) is produced by CVD process and has a thickness (D2) in the range of 0.5 to 20 µm, characterized by the fact that - the support body (1) is made of titanium or a titanium alloy and a TiC layer (2) with a further thickness (D1) in the range of 10 nm to 2.0 µm, preferably 0.5 to 2.0 µm, is inserted between the support body (1) and the diamond layer (3). or - the carrier body (1) is made of steel and an intermediate layer (2) of chromium carbide or TiN is inserted between the carrier body (1) and the diamond layer (3), which has a further thickness (D2) in the range of 1 to 50 µm, preferably 1 to 5 µm, wherein the diamond layer (3) exhibits a first peak in the range of 1335 to 1345 1 / cm and a second peak in the range of 1345 to 1355 1 / cm in the Raman spectrum.

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).

The application provides a steam turbine blade ultrahigh-temperature coating and a preparation method thereof, and relates to the technical field of material surface treatment, and comprises the following components in mass ratio: yttrium stabilized zirconium 20-30 parts, titanium aluminum nitride 15-20 parts, lanthanum magnesium aluminum spinel 10-15 parts, nano cerium oxide 5-10 parts, cobalt-based alloy 10-15 parts, rare earth element mixture 1-5 parts, hexagonal boron nitride 5-10 parts, SiC nano particles 5-10 parts, and chromium carbide 2-5 parts. The synergistic effect of the lanthanum magnesium aluminum spinel and the rare earth element mixture greatly reduces the grain growth rate of the coating at high temperature, thereby improving the stability at extreme temperature. The protective layer formed by the decomposition of the chromium carbide and the SiC nano particles jointly inhibit the sulfur corrosion, further improve the stability, and ensure the performance of the coating under high temperature conditions.

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 invention relates to an electrical connector (1), in particular an electrical connector, comprising a terminal part (1a) and a coupling part (1b), each having a metallic contact area (2, 2'), wherein the terminal part (1a) can be electrically connected to the coupling part (1b) via the metallic contact areas (2, 2'), and wherein at least one of the metallic contact areas (2, 2') has at least a partial coating system (3) applied by a PVD process. The coating system (3) comprises - a first layer (3a) of titanium or chromium arranged in the metallic contact area (2, 2'), and - at least one second layer (3b) arranged on the first layer (3a), which is formed either of carbon-doped titanium and / or chromium or alternatively of a carbide comprising titanium carbide and / or chromium carbide, and arranged on the at least one second layer (3b) at least one third layer (3c) of a hydrogen-free tetrahedral amorphous carbon with a sp 3 -Proportion of greater than 50% as bond type, which is undoped or has a doping of at least one element of the group comprising copper, tungsten, molybdenum, chromium, silver, titanium, iridium, gold, silicon, in a concentration in the range of 2 to 30 at%.

The invention discloses a valve element surface impact-resistant wear-resistant high-toughness lubricating gradient coating and a preparation method thereof, and relates to the technical field of valve element surface treatment.The valve element surface impact-resistant wear-resistant high-toughness lubricating gradient coating comprises a supporting layer, a transition layer and a functional layer which are sequentially stacked on the surface of a valve element base body; the supporting layer is a metal-based composite coating, the transition layer is a component gradient coating composed of metal chromium and chromium carbide, and the functional layer is a diamond-like coating. The mass ratio of metal chromium in the transition layer is gradually reduced in a gradient manner from the side close to the supporting layer to the side close to the functional layer, and the mass ratio of chromium carbide is correspondingly gradually increased in a gradient manner from the side close to the supporting layer to the side close to the functional layer. The valve element has the beneficial effects that the gradient coating composed of the supporting layer, the transition layer and the functional layer is arranged in the local area of the through hole where the valve element makes contact with the motor rotor, the local impact-abrasion-pollution coupling complex working condition is adapted, and the application defect of an existing surface strengthening technology is overcome.

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.

The utility model relates to the technical field of plate processing, and discloses a pressure head device for chromium carbide plate processing, which comprises a machine body, a mounting frame is fixedly mounted on the upper surface of the machine body, a hydraulic device is fixedly mounted on the outer wall of the top of the mounting frame, and the output end of the hydraulic device is fixedly connected with a pressure head. And a knocking assembly is arranged at the top of the machine body. A knocking assembly is arranged and matched with a pressing head to drive an L-shaped plate, under guiding of a lower triangular block and an upper triangular block, a sliding rod can drive a rectangular block and release limiting through sliding in a sliding groove, and therefore left-right sliding of the sliding plate is achieved in cooperation with a large spring, and a toothed plate drives a half gear to intermittently rotate; and therefore, the disc can continuously knock the lower arc block in the rotating and reverse rotating process so as to generate slight vibration, and the situation that the normal machining progress of the chromium carbide plate is affected due to the fact that the chromium carbide plate adheres to the surface of the top of the lower arc block in the pressing head operation process is avoided.

The application relates to a preparation method of a tungsten carbide-cubic boron nitride composite material, and belongs to the field of material engineering. The components of the tungsten carbide-cubic boron nitride composite material comprise the following components in parts by mass: 60-70 parts of tungsten carbide, 20-30 parts of cubic boron nitride, 5-15 parts of cobalt, 0.1-0.5 parts of chromium carbide, 0.5-1.5 parts of titanium carbide and 0.3-0.7 parts of aluminum. The tungsten carbide-cubic boron nitride composite material is prepared by adopting a hot-pressing sintering method, the balance between wear resistance and toughness is considered, the titanium carbide is a transition metal carbide, the bond type is mixed in the same crystal structure by ionic bond, covalent bond and metal bond, the performance of the composite material is further improved, the chromium carbide has the effect of inhibiting abnormal growth of tungsten carbide grains, the spherical crystal with uniform particle size can be obtained, the uniform dispersion of high-hardness cubic boron nitride can improve the wear resistance of the material, the dense structure of the submicron tungsten carbide ensures the good internal structure and mechanical properties of the material.

The application belongs to the technical field of low-carbon magnesia carbon brick preparation, and particularly relates to a low-carbon magnesia carbon brick for a ladle slag line and a preparation method thereof. # The electrically fused magnesia is coarse aggregate, and the 98 # The electrically fused magnesia is medium aggregate, and the 98 # The mixture of the electrically fused magnesia, the electrically fused magnesia-calcium sand and the zircon sand is powder, the scale graphite and the phenolic resin binder are added, the calcium hexaluminate, the siliconized magnesium, the chromium carbide and the rare earth compound are used as the additives, the raw materials are matched with each other and synergistically act to ensure that the prepared low-carbon magnesia carbon brick for the ladle slag line has excellent mechanical strength, oxidation resistance and slag resistance.

The preparation method comprises the following steps: carrying out surface cleaning and activating treatment on a metal cooker base body, putting the cooker into PVD coating equipment, vacuumizing, configuring a titanium target, a multi-component composite target and an oxide target, cleaning the surface of the cooker by adopting ion bombardment, depositing a titanium transition layer with the thickness of 0.1-0.5 mu m, and carrying out vacuum treatment to obtain the PVD composite coating cooker. The thickness of the deposited copper-aluminum-silicon-chromium carbide composite functional layer is 4.5-5.5 microns, the thickness of the deposited oxide surface layer is 0.2-0.8 microns, and furnace cooling is carried out after film plating is completed. The three-layer gradient structure design is adopted, the titanium transition layer and the base body form metallurgical bonding, the copper-aluminum-silicon-chromium carbide composite functional layer provides hydrophobic and oleophylic performance, the oxide surface layer blocks oxygen and nitrogen diffusion, and the comprehensive performance of being high in film layer bonding force, resistant to high temperature and lasting and non-sticky is achieved.

The invention relates to a corrosion-resistant nickel-based alloy column tooth, which comprises a hard phase, a binding phase and an additive, the hard phase is tungsten carbide (WC), the Fsss particle size of the tungsten carbide is 2.4-2.8 [mu] m, and the tungsten carbide accounts for 81%; the binding phase is carbonyl nickel powder, the Fsss particle size of the nickel powder is smaller than 1.8 microns, and the nickel powder accounts for 15.5%; the additive is chromium carbide, the Fsss particle size of the chromium carbide is smaller than or equal to 1.2 microns, and the chromium carbide accounts for 3.5%. The carbonyl nickel powder is uniformly dispersed, so that the bonding effect can be enhanced, the toughness of the material is improved, and the hardness stability is not damaged, and chromium carbide is added, so that the wetting angle of nickel and tungsten carbide can be reduced, and the interface bonding force is optimized to improve the toughness; and meanwhile, grain growth is effectively inhibited, the hardness stability is maintained, the corrosion resistance of the material is remarkably improved, the defect that an existing cobalt-based column tooth is poor in corrosion resistance is overcome, and the service life in a sulfur-containing environment is prolonged.

The invention relates to the technical field of high polymer materials, and provides a composite material for a high-wear-resistance plastic runway and a preparation method thereof.The composite material for the high-wear-resistance plastic runway is prepared from, by weight, 35-45 parts of thermoplastic polyurethane, 10-15 parts of butadiene styrene rubber, 20-30 parts of filler, 5-8 parts of plasticizer, 3-5 parts of anti-aging agent, 2-3 parts of vulcanizing agent and 1-1.5 parts of accelerant; the filler is kaolin, graphite and modified chromium carbide; the modified chromium carbide is zinc oxide coated chromium carbide. According to the technical scheme, the problems of low strength and poor wear resistance of the composite material for the plastic track in the prior art are solved.

The application discloses a kind of chalcogenide glass aspherical lens mould pressing mould core material and preparation method thereof, belong to infrared optical device manufacturing technical field.The mould core material is made of composite powder including niobium carbide powder, chromium carbide powder and metal nickel powder by discharge plasma sintering, wherein the mass content of nickel powder is 0wt% to 2wt%, the mass ratio of niobium carbide and chromium carbide is 30~35:65~70.The material is up to 8.5×10 ‑6 / K~9.5×10 ‑6 / K at 600 DEG C, and is well matched with chalcogenide glass, while having high hardness (1700~1900 HV30) and high fracture toughness (6.0~7.0 MPa·m¹ / ²).The preparation method key includes powder mixing under inert atmosphere, mould pre-pressing, and using gradient temperature and gradient pressure SPS sintering process.The application effectively solves the lens breakage and demoulding difficulty problem caused by insufficient thermal expansion coefficient of traditional mould material, and significantly improves the qualified rate of chalcogenide glass mould pressing.

This application belongs to the field of cemented carbide technology, specifically relating to a preparation method for improving the fracture toughness of cemented carbide and the cemented carbide itself, including the following steps: S1, obtaining tungsten carbide powder, cobalt powder, nickel powder, and chromium carbide, wherein the tungsten carbide powder is composed of medium-particle tungsten carbide and coarse-particle tungsten carbide; S2, mixing the cobalt powder, nickel powder, and chromium carbide, performing a first ultrasonic wet milling, and then drying to obtain a composite powder; S3, mixing the tungsten carbide powder and the composite powder, performing a second ultrasonic wet milling, drying, and pressing to obtain a compact; S4, performing a first sintering on the compact, and then performing a second sintering to obtain the cemented carbide; This application uses a bicrystalline structure to ensure the hardness of the cemented carbide while improving its fracture toughness, adds nickel as a second phase for toughening, improves the uniformity of the mixture through ultrasonic ball milling, and improves the uniformity of the binder phase distribution through a two-stage sintering process, thereby improving the fracture toughness of the cemented carbide.