8results about How to "High nitriding efficiency" patented technology

The invention discloses a surface strengthening method for a titanium-based piston rod part. The method comprises the following steps: 1, carrying out stretching deformation treatment on the titanium-based piston rod part to obtain the titanium-based piston rod part after tissue deformation; secondly, isothermal recovery is conducted on the titanium-based piston rod part obtained after tissue deformation, and the titanium-based piston rod part obtained after tissue regulation and control is obtained; and thirdly, the titanium-based piston rod part obtained after structure regulation and control is put into a direct-current pulse ion nitriding furnace, nitriding gas is introduced after vacuumizing, auxiliary heating and a pulse power source are started for heat preservation nitriding, and the titanium-based piston rod part with a nitriding layer on the surface is obtained. According to the method, a deformation recovery and ion nitriding combined method is adopted, the structure is effectively broken and stabilized, more effective channels are provided for diffusion of nitrogen atoms into a matrix in the nitriding process, the nitriding efficiency and the thickness of a nitriding layer are improved, and the wear resistance of a titanium-based piston rod part is enhanced; meanwhile, mechanical properties such as stretching and fatigue of titanium-based piston rod parts are not reduced, and the method is suitable for the field of titanium alloy nitriding.

The application discloses a low-temperature ion nitriding method and application. The low-temperature ion nitriding method comprises the following steps: under a selected temperature condition, ion etching treatment is performed on the surface of a workpiece by adopting an arc-enhanced glow discharge process, and then plasma nitriding treatment is performed on the workpiece by adopting an arc-enhanced plasma process to obtain a nitriding workpiece; wherein, a positive and negative alternating voltage is applied to the workpiece in the arc-enhanced plasma process. The low-temperature ion nitriding method provided by the application can realize nitriding at a lower temperature, effectively improves the deformation degree of the workpiece, and is widely applicable to surface strengthening of cutters, molds and metal parts.

The invention discloses high-corrosion-resistance stainless steel and a machining process thereof, and relates to the technical field of stainless steel. Through solution treatment and pretreatment, the gas nitriding efficiency is improved, and the surface hardness and corrosion resistance of the corrosion-resistant stainless steel are enhanced. The stainless steel is treated through the electro-deposition liquid, the coating containing nickel, cerium, nano silicon dioxide, the nano carbon nitride-organic framework composite material and zirconium is electro-deposited on the surface of the stainless steel, and the corrosion resistance of the corrosion-resistant stainless steel is enhanced. According to the invention, melamine is calcined at a high temperature to prepare anti-corrosion nano carbon nitride with a lamellar structure, and then octadecyl trichlorosilane is used for modifying the anti-corrosion nano carbon nitride, so that the hydrophobicity and dispersity of the nano carbon nitride are enhanced. Potassium fluozirconate is added into the electro-deposition liquid, and the addition of polyaspartic acid on the nano carbon nitride-organic framework composite material promotes the deposition of the zirconium element, so that the zirconium element is deposited on the surface of the stainless steel band, and the corrosion resistance of the stainless steel band is further enhanced.

This invention discloses a method for preparing nitride thin films, belonging to the field of advanced functional thin film material preparation technology. The method employs pulsed laser deposition technology and includes the following steps: placing an alloy target material prepared according to the stoichiometric ratio of the target thin film in a deposition chamber, evacuating to a background vacuum ≤, heating a single-crystal substrate to 400-1000℃, turning on a 13.56MHz radio frequency ion source and adjusting the power to 50-500W for ionizing nitrogen gas; injecting ammonia or nitrogen gas with a purity ≥99.999% into the chamber through a high-speed pulse valve with a response delay ≤50μs and an opening / closing time ≤200μs, precisely synchronized with the laser pulse electronic signal; the high-energy metallic plasma plume generated by the laser pulse ablation of the alloy target material undergoes an instantaneous gas-phase reaction with the synchronously injected reactive gas, while simultaneously bombarding the substrate surface with a high-energy nitrogen ion beam, controlling the deposition parameters to deposit a nitride thin film on the substrate, which can be cooled after in-situ annealing.

This invention discloses a special gas nitriding material rack for double-ended bolts in wind turbines, comprising a frame body and a support assembly. The support assembly is used to fix the double-ended bolts and is arranged circumferentially along the frame body. The support assembly includes a first support plate and a second support plate, which form an angle. The first support plate is fixed to the frame body, and the second support plate is rotatably mounted on the frame body. The angle between the first and second support plates can be adjusted by rotating the second support plate to clamp double-ended bolts of different sizes. This invention ensures sufficient contact between the double-ended bolts and ammonia gas, improving the nitriding effect.

The invention relates to the technical field of mold processing, in particular to a mold processing machine which comprises an outer frame, multiple sets of supporting columns are fixedly installed at the bottom end of the outer frame, a sealing cover is movably installed at an opening in the top end of the outer frame, the mold processing machine further comprises a feeding pipe, the feeding pipe is fixedly installed at the top end of the sealing cover, and the bottom end of the feeding pipe penetrates through the sealing cover. The feeding pipe is arranged in the outer frame and communicated with the interior of the outer frame, the feeding pipe is used for adding a nitrogen-containing and carbon-containing salt mixture containing silicon carbide particles into the outer frame, and the heating mechanism is arranged in the outer frame and used for heating the interior of the outer frame. According to the surface nitriding device, the to-be-machined mold can be subjected to grinding and heat treatment at the same time, surface nitriding operation can be immediately conducted on the to-be-machined mold after the grinding and heat treatment operation is completed, and the three operations can supplement one another and promote one another while the three operations are conducted; therefore, the efficiency and the quality of mold processing are greatly improved.

The invention discloses a potassium titanate whisker-based ceramic material and a preparation process thereof. The potassium titanate whisker-based ceramic material comprises the following components: potassium titanate whiskers, a sintering aid, silicate, silicon dioxide, an additive and silicon nitride powder. A proper titanium source and a proper potassium source are selected as initial raw materials; the preparation method comprises the following steps: mixing a titanium source and a potassium source according to a certain stoichiometric ratio, and fully grinding in equipment such as a ball mill; the ground mixed raw materials are put into a high-temperature furnace to be subjected to a sintering reaction, the sintering temperature is generally 600-1200 DEG C, a titanium source and a potassium source are subjected to a solid-phase reaction at the high temperature, and the potassium titanate whiskers are generated. According to the ceramic material based on the potassium titanate whiskers and the preparation process thereof, by adding the potassium titanate whisker material, when the ceramic material is damaged, the whiskers can absorb residual energy during crack expansion, so that the toughness and strength of the material can be effectively improved, and meanwhile, the fracture behavior of the material is changed, so that the material is converted from brittle fracture to ductile fracture.

The present invention provides a method and device for local nitriding of titanium alloy surface, and relates to the technical field of material surface treatment. The method for local nitriding of titanium alloy surface comprises: vacuuming the surface of the area to be nitrided of the titanium alloy workpiece; placing the surface of the area to be nitrided of the titanium alloy workpiece in a nitrogen atmosphere; and performing nitriding treatment on the area to be nitrided of the titanium alloy workpiece by laser scanning. The device for local nitriding of titanium alloy surface comprises a side wall of a vacuum box having a transparent area, and a side wall opposite to the transparent area having an operating port, the position of the operating port corresponding to the position of the transparent area. When working, the side of the vacuum box having the operating port is buckled on the surface of the area to be nitrided of the titanium alloy workpiece, the laser emission direction is toward the transparent area, and the vacuum box has a nitrogen inlet. The method and device have high nitriding efficiency and stable nitriding effect, and the workpiece is not affected, thereby solving the problems of workpiece deformation and inefficiency caused by long-term high-temperature and high-pressure nitriding.